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2390	Greenland	There may have been regions of Greenland that were 'greener' than today	Greenland Greenland ( -LSB- ˈɡriːnlənd -RSB- Kalaallit Nunaat -LSB- kaˈlaːɬit ˈnunaːt -RSB- Grønland -LSB- ˈɡ̊ʁɶnˌlanˀ -RSB- ) is an autonomous constituent country within the Kingdom of Denmark between the Arctic and Atlantic Oceans , east of the Canadian Arctic Archipelago . Though physiographically a part of the continent of North America , Greenland has been politically and culturally associated with Europe ( specifically Norway and Denmark , the colonial powers , as well as the nearby island of Iceland ) for more than a millennium . The majority of its residents are Inuit , whose ancestors began migrating from the Canadian mainland in the 13th century , gradually settling across the island . Greenland is the world 's largest island ( Australia , although larger , is generally considered to be a continental landmass rather than an island ) . Three-quarters of Greenland is covered by the only permanent ice sheet outside Antarctica . With a population of about 56,480 ( 2013 ) , it is the least densely populated country in the world . The Arctic Umiaq Line ferry acts as a lifeline for western Greenland , connecting the various cities and settlements . Greenland has been inhabited off and on for at least the last 4,500 years by Arctic peoples whose forebears migrated there from what is now Canada . Norsemen settled the uninhabited southern part of Greenland beginning in the 10th century , and Inuit peoples arrived in the 13th century . The Norse colonies disappeared in the late 15th century . Soon after their demise , beginning in 1499 , the Portuguese briefly explored and claimed the island , naming it Terra do Lavrador ( later applied to Labrador in Canada ) . In the early 18th century , Scandinavian explorers reached Greenland again . To strengthen trading and power , Denmark-Norway affirmed sovereignty over the island . Denmark -- Norway claimed Greenland for centuries . Greenland was settled by Vikings ( of Norwegian origin ) more than a thousand years ago , who had previously settled Iceland to escape persecution from the King of Norway and his central government . Vikings set sail from Greenland and Iceland , encountering North America nearly 500 years before Columbus reached the Caribbean islands . They attempted to colonize land . Though under continuous influence of Norway and Norwegians , Greenland was not formally under the Norwegian crown until 1262 . The Kingdom of Norway was extensive and a military power until the mid-14th century . Norway was dramatically hit with a larger death toll than Denmark by the Black Death , forcing Norway to accept a union in which the central government , university and other fundamental institutions were located in Copenhagen . Thus , the two kingdoms ' resources were directed at creating Copenhagen . Norway became the weaker part and lost sovereignty over Greenland in 1814 when the union was dissolved . Greenland became a Danish colony in 1814 , and was made a part of the Danish Realm in 1953 under the Constitution of Denmark . In 1973 , Greenland joined the European Economic Community with Denmark . However , in a referendum in 1982 , a majority of the population voted for Greenland to withdraw from the EEC which was effected in 1985 . Greenland contains the world 's largest and most northernly national park , Northeast Greenland National Park ( Kalaallit Nunaanni nuna eqqissisimatitaq ) . Established in 1974 and expanded to its present size in 1988 , it protects 972001 km2 of the interior and northeastern coast of Greenland and is bigger than all but twenty-nine countries in the world . Greenland is divided into four municipalities - Sermersooq , Kujalleq , Qaasuitsup , and Qeqqata . In 1979 , Denmark had granted home rule to Greenland , and in 2008 , Greenlanders voted in favour of the Self-Government Act , which transferred more power from the Danish royal government to the local Greenlandic government . Under the new structure , in effect since 21 June 2009 , Greenland can gradually assume responsibility for policing , judicial system , company law , accounting , and auditing ; mineral resource activities ; aviation ; law of legal capacity , family law and succession law ; aliens and border controls ; the working environment ; and financial regulation and supervision , while the Danish government retains control of foreign affairs and defence . It also retains control of monetary policy , providing an initial annual subsidy of DKK 3.4 billion , which is planned to diminish gradually over time . Greenland expects to grow its economy based on increased income from the extraction of natural resources . The capital , Nuuk , held the 2016 Arctic Winter Games . At 70 % , Greenland has one of the highest shares of renewable energy in the world , mostly coming from hydropower .
1782	Tuvalu	Thousands of coral atolls have "drowned" when unable to grow fast enough to survive at sea level.	Tuvalu Tuvalu ( -LSB- tᵿˈvɑːlu -RSB- or -LSB- ˈtuːvəˌluː -RSB- ) , formerly known as the Ellice Islands , is a Polynesian island nation located in the Pacific Ocean , about midway between Hawaii and Australia , lying east-northeast of the Santa Cruz Islands ( belonging to the Solomons ) , southeast of Nauru , south of Kiribati , west of Tokelau , northwest of Samoa and Wallis and Futuna and north of Fiji . It comprises three reef islands and six true atolls spread out between the latitude of 5 ° to 10 ° south and longitude of 176 ° to 180 ° , west of the International Date Line . Tuvalu has a population of 10,640 ( 2012 census ) . The total land area of the islands of Tuvalu is 26 km2 . The first inhabitants of Tuvalu were Polynesians . The pattern of settlement that is believed to have occurred is that the Polynesians spread out from Samoa and Tonga into the Tuvaluan atolls , with Tuvalu providing a stepping stone to migration into the Polynesian Outlier communities in Melanesia and Micronesia . In 1568 , Spanish navigator Álvaro de Mendaña was the first European to sail through the archipelago , sighting the island of Nui during his expedition in search of Terra Australis . In 1819 the island of Funafuti was named Ellice 's Island ; the name Ellice was applied to all nine islands after the work of English hydrographer Alexander George Findlay . The islands came under Britain 's sphere of influence in the late 19th century , when each of the Ellice Islands was declared a British Protectorate by Captain Gibson of between 9 and 16 October 1892 . The Ellice Islands were administered as British protectorate by a Resident Commissioner from 1892 to 1916 as part of the British Western Pacific Territories ( BWPT ) , and then as part of the Gilbert and Ellice Islands colony from 1916 to 1974 . A referendum was held in December 1974 to determine whether the Gilbert Islands and Ellice Islands should each have their own administration . As a consequence of the referendum , the Gilbert and Ellice Islands colony ceased to exist on 1 January 1976 and the separate British colonies of Kiribati and Tuvalu came into existence . Tuvalu became fully independent within the Commonwealth on 1 October 1978 . On 5 September 2000 Tuvalu became the 189th member of the United Nations .
954	Tundra	Melting permafrost can release not just CO2, but also methane, a much stronger heat-trapping gas.	Tundra In physical geography , tundra is a type of biome where the tree growth is hindered by low temperatures and short growing seasons . The term tundra comes through Russian тундра ( tûndra ) from the Kildin Sami word tūndâr `` uplands '' , `` treeless mountain tract '' . There are three types of tundra : Arctic tundra , alpine tundra , and Antarctic tundra . In tundra , the vegetation is composed of dwarf shrubs , sedges and grasses , mosses , and lichens . Scattered trees grow in some tundra regions . The ecotone ( or ecological boundary region ) between the tundra and the forest is known as the tree line or timberline .
3048	Carbon_dioxide_in_Earth's_atmosphere	There is no question whatsoever that the CO2 increase is human-caused.	Carbon dioxide in Earth's atmosphere Carbon dioxide is an important trace gas in Earth 's atmosphere . Currently it constitutes about 0.041 % ( equal to 410 parts per million ; ppm ) by volume of the atmosphere . Despite its relatively small concentration is a potent greenhouse gas and plays a vital role in regulating Earth 's surface temperature through radiative forcing and the greenhouse effect . Reconstructions show that concentrations of in the atmosphere have varied , ranging from as high as 7,000 ppm during the Cambrian period about 500 million years ago to as low as 180 ppm during the Quaternary glaciation of the last two million years . Carbon dioxide is an integral part of the carbon cycle , a biogeochemical cycle in which carbon is exchanged between the Earth 's oceans , soil , rocks and the biosphere . Plants and other photoautotrophs use solar energy to produce carbohydrate from atmospheric carbon dioxide and water by photosynthesis . Almost all other organisms depend on carbohydrate derived from photosynthesis as their primary source of energy and carbon compounds . The current episode of global warming is attributed to increasing emissions of and other greenhouse gases into Earth 's atmosphere . The global annual mean concentration of in the atmosphere has increased by more than 40 % since the start of the Industrial Revolution , from 280 ppm , the level it had for the last 10,000 years leading up to the mid-18th century , to 399 ppm as of 2015 . The present concentration is the highest in at least the past 800,000 years and likely the highest in the past 20 million years . The increase has been caused by anthropogenic sources , particularly the burning of fossil fuels and deforestation . The daily average concentration of atmospheric CO2 at Mauna Loa Observatory first exceeded 400 ppm on 10 May 2013 . It is currently rising at a rate of approximately 2 ppm/year and accelerating . An estimated 30 -- 40 % of the released by humans into the atmosphere dissolves into oceans , rivers and lakes , which contributes to ocean acidification .
2983	Carbon_dioxide	Despite the logarithmic relationship between CO2 and surface temperatures, atmospheric CO2 levels are rising so fast that unless we dramatically decrease our emissions, global warming will accelerate over the 21st Century.	Carbon dioxide Carbon dioxide ( chemical formula ) is a colorless gas with a density about 60 % higher than that of air ( 1.225 g/L ) that is odorless at normally encountered concentrations . Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms . It occurs naturally in Earth 's atmosphere as a trace gas at a concentration of about 0.04 percent ( 400 ppm ) by volume . Natural sources include volcanoes , hot springs and geysers , and it is freed from carbonate rocks by dissolution in water and acids . Because carbon dioxide is soluble in water , it occurs naturally in groundwater , rivers and lakes , ice caps , glaciers and seawater . It is present in deposits of petroleum and natural gas . As the source of available carbon in the carbon cycle , atmospheric carbon dioxide is the primary carbon source for life on Earth and its concentration in Earth 's pre-industrial atmosphere since late in the Precambrian has been regulated by photosynthetic organisms and geological phenomena . Plants , algae and cyanobacteria use light energy to photosynthesize carbohydrate from carbon dioxide and water , with oxygen produced as a waste product . Carbon dioxide is produced by all aerobic organisms when they metabolize carbohydrates and lipids to produce energy by respiration . It is returned to water via the gills of fish and to the air via the lungs of air-breathing land animals , including humans . Carbon dioxide is produced during the processes of decay of organic materials and the fermentation of sugars in bread , beer and winemaking . It is produced by combustion of wood and other organic materials and fossil fuels such as coal , peat , petroleum and natural gas . It is a versatile industrial material , used , for example , as an inert gas in welding and fire extinguishers , as a pressurizing gas in air guns and oil recovery , as a chemical feedstock and in liquid form as a solvent in decaffeination of coffee and supercritical drying . It is added to drinking water and carbonated beverages including beer and sparkling wine to add effervescence . The frozen solid form of , known as `` dry ice '' is used as a refrigerant and as an abrasive in dry-ice blasting . Carbon dioxide is the most significant long-lived greenhouse gas in Earth 's atmosphere . Since the Industrial Revolution anthropogenic emissions - primarily from use of fossil fuels and deforestation - have rapidly increased its concentration in the atmosphere , leading to global warming . Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid .
2075	Global_warming	The rate of global sea level rise on average has fallen by 40% the last century.	Global warming Global warming , also referred to as climate change , is the observed century-scale rise in the average temperature of the Earth 's climate system and its related effects . Multiple lines of scientific evidence show that the climate system is warming . Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record which extends back to the mid 19th century , and in paleoclimate proxy records over thousands of years . In 2013 , the Intergovernmental Panel on Climate Change ( IPCC ) Fifth Assessment Report concluded that `` It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century . '' The largest human influence has been emission of greenhouse gases such as carbon dioxide , methane and nitrous oxide . Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to for their lowest emissions scenario and 2.6 to for the highest emissions scenario . These findings have been recognized by the national science academies of the major industrialized nations and are not disputed by any scientific body of national or international standing . Future climate change and associated impacts will differ from region to region around the globe . Anticipated effects include warming global temperature , rising sea levels , changing precipitation , and expansion of deserts in the subtropics . Warming is expected to be greater over land than over the oceans and greatest in the Arctic , with the continuing retreat of glaciers , permafrost and sea ice . Other likely changes include more frequent extreme weather events including heat waves , droughts , heavy rainfall with floods and heavy snowfall ; ocean acidification ; and species extinctions due to shifting temperature regimes . Effects significant to humans include the threat to food security from decreasing crop yields and the abandonment of populated areas due to rising sea levels . Because the climate system has a large `` inertia '' and greenhouse gases will stay in the atmosphere for a long time , many of these effects will not only exist for decades or centuries , but will persist for tens of thousands of years . Possible societal responses to global warming include mitigation by emissions reduction , adaptation to its effects , building systems resilient to its effects , and possible future climate engineering . Most countries are parties to the United Nations Framework Convention on Climate Change ( UNFCCC ) , whose ultimate objective is to prevent dangerous anthropogenic climate change . Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 C-change relative to pre-industrial levels , with efforts made to limit warming to 1.5 C-change . Public reactions to global warming and concern about its effects are also increasing . A global 2015 Pew Research Center report showed a median of 54 % consider it `` a very serious problem '' . There are significant regional differences , with Americans and Chinese ( whose economies are responsible for the greatest annual CO2 emissions ) among the least concerned .
1377	Effects_of_global_warming	there has been no increase in frequency or intensity of storms, floods or droughts, while deaths attributed to such natural disasters have never been fewer	Effects of global warming The effects of global warming are the environmental and social changes caused ( directly or indirectly ) by human emissions of greenhouse gases . There is a scientific consensus that climate change is occurring , and that human activities are the primary driver . Many impacts of climate change have already been observed , including glacier retreat , changes in the timing of seasonal events ( e.g. , earlier flowering of plants ) , and changes in agricultural productivity . Future effects of climate change will vary depending on climate change policies and social development . The two main policies to address climate change are reducing human greenhouse gas emissions ( climate change mitigation ) and adapting to the impacts of climate change . Geoengineering is another policy option . Near-term climate change policies could significantly affect long-term climate change impacts . Stringent mitigation policies might be able to limit global warming ( in 2100 ) to around 2 ° C or below , relative to pre-industrial levels . Without mitigation , increased energy demand and extensive use of fossil fuels might lead to global warming of around 4 ° C. Higher magnitudes of global warming would be more difficult to adapt to , and would increase the risk of negative impacts .
2422	JAXA	As of today,JAXA shows that we have more ice than any time on this date for the past 8 years of Aqua satellite measurement for this AMSRE dataset."	JAXA The , or JAXA , is Japan 's national aero-space agency . Through the merger of three previously independent organizations , JAXA was formed on 1 October 2003 . JAXA is responsible for research , technology development and the launch of satellites into orbit , and is involved in many more advanced missions , such as asteroid exploration and possible manned exploration of the Moon . Its motto is One JAXA and its corporate slogan is Explore to Realize ( formerly Reaching for the skies , exploring space ) .
484	Carbon_sink	"We almost take forests as a given but we lose forest every year, which means we are diminishing them as a carbon sink.	Carbon sink A carbon sink is a natural or artificial reservoir that accumulates and stores some carbon-containing chemical compound for an indefinite period . The process by which carbon sinks remove carbon dioxide from the atmosphere is known as carbon sequestration . Public awareness of the significance of CO2 sinks has grown since passage of the Kyoto Protocol , which promotes their use as a form of carbon offset . There are also different strategies used to enhance this process .
807	Effects_of_global_warming	the total area burned in the western United States over the past 33 years was double the size it would have been without any human-caused warming.	Effects of global warming The effects of global warming are the environmental and social changes caused ( directly or indirectly ) by human emissions of greenhouse gases . There is a scientific consensus that climate change is occurring , and that human activities are the primary driver . Many impacts of climate change have already been observed , including glacier retreat , changes in the timing of seasonal events ( e.g. , earlier flowering of plants ) , and changes in agricultural productivity . Future effects of climate change will vary depending on climate change policies and social development . The two main policies to address climate change are reducing human greenhouse gas emissions ( climate change mitigation ) and adapting to the impacts of climate change . Geoengineering is another policy option . Near-term climate change policies could significantly affect long-term climate change impacts . Stringent mitigation policies might be able to limit global warming ( in 2100 ) to around 2 ° C or below , relative to pre-industrial levels . Without mitigation , increased energy demand and extensive use of fossil fuels might lead to global warming of around 4 ° C. Higher magnitudes of global warming would be more difficult to adapt to , and would increase the risk of negative impacts .
490	Global_warming	IPCC report warning last week the world is "nowhere near on track" to meet its Paris commitments	Global warming Global warming , also referred to as climate change , is the observed century-scale rise in the average temperature of the Earth 's climate system and its related effects . Multiple lines of scientific evidence show that the climate system is warming . Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record which extends back to the mid 19th century , and in paleoclimate proxy records over thousands of years . In 2013 , the Intergovernmental Panel on Climate Change ( IPCC ) Fifth Assessment Report concluded that `` It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century . '' The largest human influence has been emission of greenhouse gases such as carbon dioxide , methane and nitrous oxide . Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to for their lowest emissions scenario and 2.6 to for the highest emissions scenario . These findings have been recognized by the national science academies of the major industrialized nations and are not disputed by any scientific body of national or international standing . Future climate change and associated impacts will differ from region to region around the globe . Anticipated effects include warming global temperature , rising sea levels , changing precipitation , and expansion of deserts in the subtropics . Warming is expected to be greater over land than over the oceans and greatest in the Arctic , with the continuing retreat of glaciers , permafrost and sea ice . Other likely changes include more frequent extreme weather events including heat waves , droughts , heavy rainfall with floods and heavy snowfall ; ocean acidification ; and species extinctions due to shifting temperature regimes . Effects significant to humans include the threat to food security from decreasing crop yields and the abandonment of populated areas due to rising sea levels . Because the climate system has a large `` inertia '' and greenhouse gases will stay in the atmosphere for a long time , many of these effects will not only exist for decades or centuries , but will persist for tens of thousands of years . Possible societal responses to global warming include mitigation by emissions reduction , adaptation to its effects , building systems resilient to its effects , and possible future climate engineering . Most countries are parties to the United Nations Framework Convention on Climate Change ( UNFCCC ) , whose ultimate objective is to prevent dangerous anthropogenic climate change . Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 C-change relative to pre-industrial levels , with efforts made to limit warming to 1.5 C-change . Public reactions to global warming and concern about its effects are also increasing . A global 2015 Pew Research Center report showed a median of 54 % consider it `` a very serious problem '' . There are significant regional differences , with Americans and Chinese ( whose economies are responsible for the greatest annual CO2 emissions ) among the least concerned .
1502	Australia	unadjusted data suggests that temperatures in Australia have only increased by 0.3 degrees over the past century, not the 1 degree usually claimed.	Australia Australia ( -LSB- əˈstreɪliə -RSB- , -LSB- ɒ - -RSB- , -LSB- - ljə -RSB- ) , officially the Commonwealth of Australia , is a country comprising the mainland of the Australian continent , the island of Tasmania and numerous smaller islands . It is the world 's sixth-largest country by total area . The neighbouring countries are Papua New Guinea , Indonesia and East Timor to the north ; the Solomon Islands and Vanuatu to the north-east ; and New Zealand to the south-east . Australia 's capital is Canberra , and its largest urban area is Sydney . For about 50,000 years before the first British settlement in the late 18th century , Australia was inhabited by indigenous Australians , who spoke languages classifiable into roughly 250 groups . After the European discovery of the continent by Dutch explorers in 1606 , Australia 's eastern half was claimed by Great Britain in 1770 and initially settled through penal transportation to the colony of New South Wales from 26 January 1788 . The population grew steadily in subsequent decades , and by the 1850s most of the continent had been explored and an additional five self-governing crown colonies established . On 1 January 1901 , the six colonies federated , forming the Commonwealth of Australia . Australia has since maintained a stable liberal democratic political system that functions as a federal parliamentary constitutional monarchy comprising six states and several territories . The population of 24 million is highly urbanised and heavily concentrated on the eastern seaboard . Australia has the world 's 13th-largest economy and ninth-highest per capita income ( IMF ) . With the second-highest human development index globally , the country ranks highly in quality of life , health , education , economic freedom , and civil liberties and political rights . Australia is a member of the United Nations , G20 , Commonwealth of Nations , ANZUS , Organisation for Economic Co-operation and Development ( OECD ) , World Trade Organization , Asia-Pacific Economic Cooperation , and the Pacific Islands Forum .
577	Heat_wave	'Heatwaves are far more intense than when my parents were growing up in the 1950s.	Heat wave A heat wave is a prolonged period of excessively hot weather , which may be accompanied by high humidity , especially in oceanic climate countries . While definitions vary , a heat wave is measured relative to the usual weather in the area and relative to normal temperatures for the season . Temperatures that people from a hotter climate consider normal can be termed a heat wave in a cooler area if they are outside the normal climate pattern for that area . The term is applied both to hot weather variations and to extraordinary spells of hot which may occur only once a century . Severe heat waves have caused catastrophic crop failures , thousands of deaths from hyperthermia , and widespread power outages due to increased use of air conditioning . A heat wave is considered extreme weather , and a danger because heat and sunlight may overheat the human body .
3038	Greenhouse_gas	Clearly, other factors besides atmospheric carbon influence earth temperatures and global warming."	Greenhouse gas A greenhouse gas ( abbrev . GHG ) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range . This process is the fundamental cause of the greenhouse effect . The primary greenhouse gases in Earth 's atmosphere are water vapor , carbon dioxide , methane , nitrous oxide , and ozone . Without greenhouse gases , the average temperature of Earth 's surface would be about -18 ° C , rather than the present average of 15 ° C . In the Solar System , the atmospheres of Venus , Mars and Titan also contain gases that cause a greenhouse effect . Human activities since the beginning of the Industrial Revolution ( taken as the year 1750 ) have produced a 40 % increase in the atmospheric concentration of carbon dioxide , from 280 ppm in 1750 to 406 ppm in early 2017 . This increase has occurred despite the uptake of a large portion of the emissions by various natural `` sinks '' involved in the carbon cycle . Anthropogenic carbon dioxide emissions ( i.e. , emissions produced by human activities ) come from combustion of fossil fuels , principally coal , oil , and natural gas , along with deforestation , soil erosion and animal agriculture . It has been estimated that if greenhouse gas emissions continue at the present rate , Earth 's surface temperature could exceed historical values as early as 2047 , with potentially harmful effects on ecosystems , biodiversity and the livelihoods of people worldwide . Recent estimates suggest that on the current emissions trajectory the Earth could pass a threshold of 2 ° C global warming , which the United Nations ' IPCC designated as the upper limit to avoid `` dangerous '' global warming , by 2036 .
528	Evolution	Our evolving dynamic planet has survived[…] mass extinctions	Evolution Evolution is change in the heritable characteristics of biological populations over successive generations . Evolutionary processes give rise to biodiversity at every level of biological organisation , including the levels of species , individual organisms , and molecules . All life on Earth shares a common ancestor known as the last universal common ancestor ( LUCA ) , which lived approximately 3.5 -- 3.8 billion years ago , although a study in 2015 found `` remains of biotic life '' from 4.1 billion years ago in ancient rocks in Western Australia . In July 2016 , scientists reported identifying a set of 355 genes from the LUCA of all organisms living on Earth . Repeated formation of new species ( speciation ) , change within species ( anagenesis ) , and loss of species ( extinction ) throughout the evolutionary history of life on Earth are demonstrated by shared sets of morphological and biochemical traits , including shared DNA sequences . These shared traits are more similar among species that share a more recent common ancestor , and can be used to reconstruct a biological `` tree of life '' based on evolutionary relationships ( phylogenetics ) , using both existing species and fossils . The fossil record includes a progression from early biogenic graphite , to microbial mat fossils , to fossilized multicellular organisms . Existing patterns of biodiversity have been shaped both by speciation and by extinction . More than 99 percent of all species that ever lived on Earth are estimated to be extinct . Estimates of Earth 's current species range from 10 to 14 million , of which about 1.9 million are estimated to have been named and 1.6 million documented in a central database to date . More recently , in May 2016 , scientists reported that 1 trillion species are estimated to be on Earth currently with only one-thousandth of one percent described . In the mid-19th century , Charles Darwin formulated the scientific theory of evolution by natural selection , published in his book On the Origin of Species ( 1859 ) . Evolution by natural selection is a process demonstrated by the observation that more offspring are produced than can possibly survive , along with three facts about populations : 1 ) traits vary among individuals with respect to morphology , physiology , and behaviour ( phenotypic variation ) , 2 ) different traits confer different rates of survival and reproduction ( differential fitness ) , and 3 ) traits can be passed from generation to generation ( heritability of fitness ) . Thus , in successive generations members of a population are replaced by progeny of parents better adapted to survive and reproduce in the biophysical environment in which natural selection takes place . This teleonomy is the quality whereby the process of natural selection creates and preserves traits that are seemingly fitted for the functional roles they perform . The processes by which the changes occur , from one generation to another , are called evolutionary processes or mechanisms . The four most widely recognized evolutionary processes are natural selection ( including sexual selection ) , genetic drift , mutation and gene migration due to genetic admixture . Natural selection and genetic drift sort variation ; mutation and gene migration create variation . Consequences of selection can include meiotic drive ( unequal transmission of certain alleles ) , nonrandom mating and genetic hitchhiking . In the early 20th century the modern evolutionary synthesis integrated classical genetics with Darwin 's theory of evolution by natural selection through the discipline of population genetics . The importance of natural selection as a cause of evolution was accepted into other branches of biology . Moreover , previously held notions about evolution , such as orthogenesis , evolutionism , and other beliefs about innate `` progress '' within the largest-scale trends in evolution , became obsolete . Scientists continue to study various aspects of evolutionary biology by forming and testing hypotheses , constructing mathematical models of theoretical biology and biological theories , using observational data , and performing experiments in both the field and the laboratory . In terms of practical application , an understanding of evolution has been instrumental to developments in numerous scientific and industrial fields , including agriculture , human and veterinary medicine , and the life sciences in general . Discoveries in evolutionary biology have made a significant impact not just in the traditional branches of biology but also in other academic disciplines , including biological anthropology , and evolutionary psychology . Evolutionary computation , a sub-field of artificial intelligence , involves the application of Darwinian principles to problems in computer science .
256	Medieval_Warm_Period	One of the main areas of contention is the existence of two strange climate episodes known as The Medieval Warm Period (MWP) and the Little Ice Age.	Medieval Warm Period The Medieval Warm Period ( MWP ) , Medieval Climate Optimum , or Medieval Climatic Anomaly was a time of warm climate in the North Atlantic region that may also have been related to other climate events around the world during that time , including China and other areas , lasting from about 950 to 1250 . It was followed by a cooler period in the North Atlantic and elsewhere termed the Little Ice Age . Some refer to the event as the Medieval Climatic Anomaly as this term emphasizes that effects other than temperature were important . Despite uncertainties , especially for the period prior to 1600 for which data are scarce , the warmest period of the last 2,000 years prior to the 20th century in the Northern Hemisphere very likely occurred between 950 and 1100 . Proxy records show peak warmth occurred at different times for different regions , indicating that the Medieval Warm Period was not a time of globally uniform change . Temperatures in some regions matched or exceeded recent temperatures in these regions , but globally the Medieval Warm Period was cooler than recent global temperatures . Possible causes of the Medieval Warm Period include increased solar activity , decreased volcanic activity , and changes to ocean circulation .
954	Permafrost	Melting permafrost can release not just CO2, but also methane, a much stronger heat-trapping gas.	Permafrost In geology , permafrost is ground , including rock or ( cryotic ) soil , at or below the freezing point of water 0 C for two or more years . Most permafrost is located in high latitudes ( in and around the Arctic and Antarctic regions ) , but alpine permafrost may exist at high altitudes in much lower latitudes . Ground ice is not always present , as may be in the case of nonporous bedrock , but it frequently occurs and it may be in amounts exceeding the potential hydraulic saturation of the ground material . Permafrost accounts for 0.022 % of total water on earth and exists in 24 % of exposed land in the Northern Hemisphere . It also occurs subsea on the continental shelves of the continents surrounding the Arctic Ocean , portions of which were exposed during the last glacial period , with global weather implications . A global temperature rise of 1.5 C-change above current levels would be enough to start the thawing of permafrost in Siberia , according to one group of scientists .
2081	Heat_wave	Heat waves have been decreasing since the 1930s in the U.S. and globally.	Heat wave A heat wave is a prolonged period of excessively hot weather , which may be accompanied by high humidity , especially in oceanic climate countries . While definitions vary , a heat wave is measured relative to the usual weather in the area and relative to normal temperatures for the season . Temperatures that people from a hotter climate consider normal can be termed a heat wave in a cooler area if they are outside the normal climate pattern for that area . The term is applied both to hot weather variations and to extraordinary spells of hot which may occur only once a century . Severe heat waves have caused catastrophic crop failures , thousands of deaths from hyperthermia , and widespread power outages due to increased use of air conditioning . A heat wave is considered extreme weather , and a danger because heat and sunlight may overheat the human body .
1890	Electricity_generation	Germany managed to increase its use of renewables and its output of carbon dioxide at the same time -- because it resorted to cheap coal to keep the lights on at a price its people could afford.	Electricity generation Electricity generation is the process of generating electric power from sources of primary energy . For electric utilities , it is the first process in the delivery of electricity to consumers . The other processes as transmission , distribution , energy storage and recovery using pumped-storage methods are normally carried out by the electric power industry . Electricity is most often generated at a power station by electromechanical generators , primarily driven by heat engines fuelled by combustion or nuclear fission but also by other means such as the kinetic energy of flowing water and wind . Other energy sources include solar photovoltaics and geothermal power .
3070	Poverty_in_the_United_Kingdom	So this is a government which is proposing to put at risk our manufacturing industry, to penalise struggling families, to make a tough situation worse for millions of households right around Australia.	Poverty in the United Kingdom This article is about poverty within the population of the United Kingdom as distinct from UK policy on world poverty . Despite being a developed country , those living at the lower end of the income distribution in the United Kingdom have a relatively low standard of living . Data based on incomes published in 2016 by Department for Work and Pensions ( DWP ) show that , after housing costs have been taken into consideration , the number of people living in the UK in relative poverty to be 13.44 m ( 21 % of the population ) In 2015 , a report by Institute for Fiscal Studies reported that 21.6 % of Britons were now in relative poverty . The report showed that there had been a fall in poverty in the first few years of the twenty-first century , but the rate of poverty had remained broadly flat since 2004/5 . It has been found by the Poverty and Social Exclusion project at Bristol University in 2014 , that the proportion of households lacking three items or activities deemed necessary for life in the UK at that time ( as defined by a survey of the wider population ) has increased from 14 % in 1983 to 33 % in 2012 .
3059	Greenhouse_gas	Models and direct observations find that CFCs only contribute a fraction of the warming supplied by other greenhouse gases.	Greenhouse gas A greenhouse gas ( abbrev . GHG ) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range . This process is the fundamental cause of the greenhouse effect . The primary greenhouse gases in Earth 's atmosphere are water vapor , carbon dioxide , methane , nitrous oxide , and ozone . Without greenhouse gases , the average temperature of Earth 's surface would be about -18 ° C , rather than the present average of 15 ° C . In the Solar System , the atmospheres of Venus , Mars and Titan also contain gases that cause a greenhouse effect . Human activities since the beginning of the Industrial Revolution ( taken as the year 1750 ) have produced a 40 % increase in the atmospheric concentration of carbon dioxide , from 280 ppm in 1750 to 406 ppm in early 2017 . This increase has occurred despite the uptake of a large portion of the emissions by various natural `` sinks '' involved in the carbon cycle . Anthropogenic carbon dioxide emissions ( i.e. , emissions produced by human activities ) come from combustion of fossil fuels , principally coal , oil , and natural gas , along with deforestation , soil erosion and animal agriculture . It has been estimated that if greenhouse gas emissions continue at the present rate , Earth 's surface temperature could exceed historical values as early as 2047 , with potentially harmful effects on ecosystems , biodiversity and the livelihoods of people worldwide . Recent estimates suggest that on the current emissions trajectory the Earth could pass a threshold of 2 ° C global warming , which the United Nations ' IPCC designated as the upper limit to avoid `` dangerous '' global warming , by 2036 .
331	Global_warming	But each serial adjustment has tended to make the early years colder, which increases the warming trend.	Global warming Global warming , also referred to as climate change , is the observed century-scale rise in the average temperature of the Earth 's climate system and its related effects . Multiple lines of scientific evidence show that the climate system is warming . Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record which extends back to the mid 19th century , and in paleoclimate proxy records over thousands of years . In 2013 , the Intergovernmental Panel on Climate Change ( IPCC ) Fifth Assessment Report concluded that `` It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century . '' The largest human influence has been emission of greenhouse gases such as carbon dioxide , methane and nitrous oxide . Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to for their lowest emissions scenario and 2.6 to for the highest emissions scenario . These findings have been recognized by the national science academies of the major industrialized nations and are not disputed by any scientific body of national or international standing . Future climate change and associated impacts will differ from region to region around the globe . Anticipated effects include warming global temperature , rising sea levels , changing precipitation , and expansion of deserts in the subtropics . Warming is expected to be greater over land than over the oceans and greatest in the Arctic , with the continuing retreat of glaciers , permafrost and sea ice . Other likely changes include more frequent extreme weather events including heat waves , droughts , heavy rainfall with floods and heavy snowfall ; ocean acidification ; and species extinctions due to shifting temperature regimes . Effects significant to humans include the threat to food security from decreasing crop yields and the abandonment of populated areas due to rising sea levels . Because the climate system has a large `` inertia '' and greenhouse gases will stay in the atmosphere for a long time , many of these effects will not only exist for decades or centuries , but will persist for tens of thousands of years . Possible societal responses to global warming include mitigation by emissions reduction , adaptation to its effects , building systems resilient to its effects , and possible future climate engineering . Most countries are parties to the United Nations Framework Convention on Climate Change ( UNFCCC ) , whose ultimate objective is to prevent dangerous anthropogenic climate change . Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 C-change relative to pre-industrial levels , with efforts made to limit warming to 1.5 C-change . Public reactions to global warming and concern about its effects are also increasing . A global 2015 Pew Research Center report showed a median of 54 % consider it `` a very serious problem '' . There are significant regional differences , with Americans and Chinese ( whose economies are responsible for the greatest annual CO2 emissions ) among the least concerned .
2992	Mauna_Loa	The measurements of the amount of CO2 made at the Mauna Loa Observatory are accurate and uncontaminated by any emissions from the volcano.	Mauna Loa Mauna Loa ( -LSB- ˌmɔːnə_ˈloʊ . ə -RSB- or -LSB- ˌmaʊnə_ˈloʊ . ə -RSB- Hawaiian : -LSB- - hawˈmɐwnə ˈlowə -RSB- Long Mountain ) is one of five volcanoes that form the Island of Hawaii in the U.S. state of Hawaii in the Pacific Ocean . The largest subaerial volcano in both mass and volume , Mauna Loa has historically been considered the largest volcano on Earth . It is an active shield volcano with relatively gentle slopes , with a volume estimated at approximately 18000 mi3 , although its peak is about 120 ft lower than that of its neighbor , Mauna Kea . Lava eruptions from Mauna Loa are silica-poor and very fluid , and they tend to be non-explosive . Mauna Loa has probably been erupting for at least 700,000 years , and may have emerged above sea level about 400,000 years ago . The oldest-known dated rocks are not older than 200,000 years . The volcano 's magma comes from the Hawaii hotspot , which has been responsible for the creation of the Hawaiian island chain over tens of millions of years . The slow drift of the Pacific Plate will eventually carry Mauna Loa away from the hotspot within 500,000 to one million years from now , at which point it will become extinct . Mauna Loa 's most recent eruption occurred from March 24 to April 15 , 1984 . No recent eruptions of the volcano have caused fatalities , but eruptions in 1926 and 1950 destroyed villages , and the city of Hilo is partly built on lava flows from the late 19th century . Because of the potential hazards it poses to population centers , Mauna Loa is part of the Decade Volcanoes program , which encourages studies of the world 's most dangerous volcanoes . Mauna Loa has been monitored intensively by the Hawaiian Volcano Observatory since 1912 . Observations of the atmosphere are undertaken at the Mauna Loa Observatory , and of the Sun at the Mauna Loa Solar Observatory , both located near the mountain 's summit . Hawaii Volcanoes National Park covers the summit and the southeastern flank of the volcano , and also incorporates Kīlauea , a separate volcano .
3005	Global_warming	About 60% of the warming observed from 1970 to 2000 was very likely caused by the above natural 60-year climatic cycle during its warming phase" (Loehle and Scafetta)	Global warming Global warming , also referred to as climate change , is the observed century-scale rise in the average temperature of the Earth 's climate system and its related effects . Multiple lines of scientific evidence show that the climate system is warming . Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record which extends back to the mid 19th century , and in paleoclimate proxy records over thousands of years . In 2013 , the Intergovernmental Panel on Climate Change ( IPCC ) Fifth Assessment Report concluded that `` It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century . '' The largest human influence has been emission of greenhouse gases such as carbon dioxide , methane and nitrous oxide . Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to for their lowest emissions scenario and 2.6 to for the highest emissions scenario . These findings have been recognized by the national science academies of the major industrialized nations and are not disputed by any scientific body of national or international standing . Future climate change and associated impacts will differ from region to region around the globe . Anticipated effects include warming global temperature , rising sea levels , changing precipitation , and expansion of deserts in the subtropics . Warming is expected to be greater over land than over the oceans and greatest in the Arctic , with the continuing retreat of glaciers , permafrost and sea ice . Other likely changes include more frequent extreme weather events including heat waves , droughts , heavy rainfall with floods and heavy snowfall ; ocean acidification ; and species extinctions due to shifting temperature regimes . Effects significant to humans include the threat to food security from decreasing crop yields and the abandonment of populated areas due to rising sea levels . Because the climate system has a large `` inertia '' and greenhouse gases will stay in the atmosphere for a long time , many of these effects will not only exist for decades or centuries , but will persist for tens of thousands of years . Possible societal responses to global warming include mitigation by emissions reduction , adaptation to its effects , building systems resilient to its effects , and possible future climate engineering . Most countries are parties to the United Nations Framework Convention on Climate Change ( UNFCCC ) , whose ultimate objective is to prevent dangerous anthropogenic climate change . Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 C-change relative to pre-industrial levels , with efforts made to limit warming to 1.5 C-change . Public reactions to global warming and concern about its effects are also increasing . A global 2015 Pew Research Center report showed a median of 54 % consider it `` a very serious problem '' . There are significant regional differences , with Americans and Chinese ( whose economies are responsible for the greatest annual CO2 emissions ) among the least concerned .
1426	Marine_habitats	Many of the world's coral reefs are already barren or in a state of constant decline.	Marine habitats The marine environment supplies many kinds of habitats that support marine life . Marine life depends in some way on the saltwater that is in the sea ( the term marine comes from the Latin mare , meaning sea or ocean ) . A habitat is an ecological or environmental area inhabited by one or more living species . Marine habitats can be divided into coastal and open ocean habitats . Coastal habitats are found in the area that extends from as far as the tide comes in on the shoreline out to the edge of the continental shelf . Most marine life is found in coastal habitats , even though the shelf area occupies only seven percent of the total ocean area . Open ocean habitats are found in the deep ocean beyond the edge of the continental shelf . Alternatively , marine habitats can be divided into pelagic and demersal zones . Pelagic habitats are found near the surface or in the open water column , away from the bottom of the ocean . Demersal habitats are near or on the bottom of the ocean . An organism living in a pelagic habitat is said to be a pelagic organism , as in pelagic fish . Similarly , an organism living in a demersal habitat is said to be a demersal organism , as in demersal fish . Pelagic habitats are intrinsically shifting and ephemeral , depending on what ocean currents are doing . Marine habitats can be modified by their inhabitants . Some marine organisms , like corals , kelp , mangroves and seagrasses , are ecosystem engineers which reshape the marine environment to the point where they create further habitat for other organisms . __ TOC __
903	Greenhouse	Growers regularly pump CO2 into greenhouses, raising levels to three times that of the natural environment, to produce stronger, greener, healthier plants."	Greenhouse A greenhouse ( also called a glasshouse , or , if with sufficient heating , a hothouse ) is a structure with walls and roof made chiefly of transparent material , such as glass , in which plants requiring regulated climatic conditions are grown . These structures range in size from small sheds to industrial-sized buildings . A miniature greenhouse is known as a cold frame . The interior of a greenhouse exposed to sunlight becomes significantly warmer than the external ambient temperature , protecting its contents in cold weather . Many commercial glass greenhouses or hothouses are high tech production facilities for vegetables or flowers . The glass greenhouses are filled with equipment including screening installations , heating , cooling , lighting , and may be controlled by a computer to optimize conditions for plant growth . Different techniques are then used to evaluate optimality-degrees and comfort ratio of greenhouse micro-climate ( i.e. , air temperature , relative humidity and vapor pressure deficit ) in order to reduce production risk prior to cultivation of a specific crop .
1021	Coral_in_non-tropical_regions	The corals may save themselves, as many other creatures are attempting to do, by moving toward the poles as the Earth warms, establishing new reefs in cooler water."	Coral in non-tropical regions The poleward migration of coral species refers to the phenomenon brought on by rising sea temperatures, wherein corals are colonising cooler climates in an attempt to circumvent coral bleaching, rising sea levels and ocean acidification. In the age of Anthropocene, the changing global climate has disrupted fundamental natural processes and brought about observable changes in the submarine sphere. Whilst coral reefs are bleaching in tropical areas like the Great Barrier Reef, even more striking, and perhaps more alarming; is the growth of tropical coral species in temperate regions, which has taken place over the past decade. Coral reefs are frequently compared to the "canaries in the coal mine," who were used by miners as an indicator of air quality. In much the same way, "coral reefs are sensitive to environmental changes that could damage other habitats in the future," meaning they will be the first to visually exhibit the true implications of global warming on the natural world.
2049	Climate_change_adaptation	The Millennium Drought starting in 1997 and ending in 2010 was misinterpreted as a long term trend as a consequence of Climate Change.	Climate change adaptation Climate change adaptation is a response to global warming and climate change , that seeks to reduce the vulnerability of social and biological systems to relatively sudden change and thus offset the effects of global warming . Even if emissions are stabilized relatively soon , global warming and its effects will last many years , and adaptation will be necessary to the resulting changes in climate . Adaptation is especially important in developing countries since those countries are predicted to bear the brunt of the effects of global warming . That is , the capacity and potential for humans to adapt ( called adaptive capacity ) is unevenly distributed across different regions and populations , and developing countries generally have less capacity to adapt ( Schneider et al. , 2007 ) . Furthermore , the degree of adaptation correlates to the situational focus on environmental issues . Therefore , adaptation requires the situational assessment of sensitivity and vulnerability to environmental impacts . Adaptive capacity is closely linked to social and economic development ( IPCC , 2007 ) . The economic costs of adaptation to climate change are likely to cost billions of dollars annually for the next several decades , though the amount of money needed is unknown . Donor countries promised an annual $ 100 billion by 2020 through the Green Climate Fund for developing countries to adapt to climate change . However , while the fund was set up during COP16 in Cancún , concrete pledges by developed countries have not been forthcoming . The adaptation challenge grows with the magnitude and the rate of climate change . Another response to climate change , known as climate change mitigation ( Verbruggen , 2007 ) is to reduce greenhouse gas ( GHG ) emissions and/or enhance the removal of these gases from the atmosphere ( through carbon sinks ) . Even the most effective reductions in emissions , however , would not prevent further climate change impacts , making the need for adaptation unavoidable ( Klein et al. , 2007 ) . In a literature assessment , Klein et al. ( 2007 ) assessed options for adaptation . They concluded , with very high confidence , that in the absence of mitigation efforts , the effects of climate change would reach such a magnitude as to make adaptation impossible for some natural ecosystems . Others are concerned that climate adaptation programs might interfere with the existing development programs and thus lead to unintended consequences for vulnerable groups . For human systems , the economic and social costs of unmitigated climate change would be very high .
2815	Global_warming	A new peer-reviewed study on Surface Warming and the Solar Cycle found that times of high solar activity are on average 0.2°C warmer than times of low solar activity, and that there is a polar amplification of the warming.	Global warming Global warming , also referred to as climate change , is the observed century-scale rise in the average temperature of the Earth 's climate system and its related effects . Multiple lines of scientific evidence show that the climate system is warming . Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record which extends back to the mid 19th century , and in paleoclimate proxy records over thousands of years . In 2013 , the Intergovernmental Panel on Climate Change ( IPCC ) Fifth Assessment Report concluded that `` It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century . '' The largest human influence has been emission of greenhouse gases such as carbon dioxide , methane and nitrous oxide . Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to for their lowest emissions scenario and 2.6 to for the highest emissions scenario . These findings have been recognized by the national science academies of the major industrialized nations and are not disputed by any scientific body of national or international standing . Future climate change and associated impacts will differ from region to region around the globe . Anticipated effects include warming global temperature , rising sea levels , changing precipitation , and expansion of deserts in the subtropics . Warming is expected to be greater over land than over the oceans and greatest in the Arctic , with the continuing retreat of glaciers , permafrost and sea ice . Other likely changes include more frequent extreme weather events including heat waves , droughts , heavy rainfall with floods and heavy snowfall ; ocean acidification ; and species extinctions due to shifting temperature regimes . Effects significant to humans include the threat to food security from decreasing crop yields and the abandonment of populated areas due to rising sea levels . Because the climate system has a large `` inertia '' and greenhouse gases will stay in the atmosphere for a long time , many of these effects will not only exist for decades or centuries , but will persist for tens of thousands of years . Possible societal responses to global warming include mitigation by emissions reduction , adaptation to its effects , building systems resilient to its effects , and possible future climate engineering . Most countries are parties to the United Nations Framework Convention on Climate Change ( UNFCCC ) , whose ultimate objective is to prevent dangerous anthropogenic climate change . Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 C-change relative to pre-industrial levels , with efforts made to limit warming to 1.5 C-change . Public reactions to global warming and concern about its effects are also increasing . A global 2015 Pew Research Center report showed a median of 54 % consider it `` a very serious problem '' . There are significant regional differences , with Americans and Chinese ( whose economies are responsible for the greatest annual CO2 emissions ) among the least concerned .
712	River_Thames	"Instead of a three-foot increase in ocean levels by the end of the century, six feet was more likely, according to DeConto and Pollard's findings.	River Thames The River Thames ( -LSB- tɛmz -RSB- ) is a river that flows through southern England , most notably through London . At 215 mi , it is the longest river entirely in England and the second longest in the United Kingdom , after the River Severn . It also flows through Oxford ( where it is called Isis ) , Reading , Henley-on-Thames and Windsor . The lower reaches of the river are called the Tideway , derived from its long tidal reach up to Teddington Lock . It rises at Thames Head in Gloucestershire , and flows into the North Sea via the Thames Estuary . The Thames drains the whole of Greater London . Its tidal section , reaching up to Teddington Lock , includes most of its London stretch and has a rise and fall of 7 m. Running through some of the driest parts of mainland Britain and heavily abstracted for drinking water , the Thames ' discharge is low considering its length and breadth : the Severn has a discharge almost twice as large on average despite having a smaller drainage basin . In Scotland , the Tay achieves more than double the average discharge from a drainage basin that is 60 % smaller . Along its course are 45 navigation locks with accompanying weirs . Its catchment area covers a large part of South Eastern and a small part of Western England and the river is fed by 38 named tributaries . The river contains over 80 islands . With its waters varying from freshwater to almost seawater , the Thames supports a variety of wildlife and has a number of adjoining Sites of Special Scientific Interest , with the largest being in the remaining parts of the North Kent Marshes and covering 5449 ha . In 2010 , the Thames won the largest environmental award in the world -- the $ 350,000 International Riverprize .
496	Climate_of_Florida	Nine years into that 11-year hurricane drought, a NASA scientist computed it as a 1-in-177-year event.	Climate of Florida The climate of the north and central parts of the US state of Florida is humid subtropical . South Florida has a tropical climate . There is a defined rainy season from May through October , when air mass thundershowers that build in the heat of the day drop heavy but brief summer rainfall . Late summer and early fall bring decaying tropical lows ( and occasionally landfalling tropical cyclones ) that contribute to late summer and early fall rains In October the dry season sets in across much of Florida ( starting early in the month in northern Florida and near the end of the month in deep southern Florida ) and lasts until late April in most years . Fronts from mid-latitude storms north of Florida occasionally pass through northern and central parts of the state which bring light and brief winter rainfall . Mid and late winter can become severely dry in Florida . In some years the dry season becomes quite severe and water restrictions are imposed to conserve water . While most areas of Florida do not experience any type of frozen precipitation , north Florida can see fleeting snow or sleet a few times each decade . The Gulf Stream running through the Florida Straits and then north off the Florida East Coast keeps temperatures moderate a few miles inland from around Stuart on the east coast to Ft. Myers on the west side of the state year round , with few extremes in temperature . The tropical ocean current also provides warm sea surface temperatures , giving Florida beaches the warmest ocean surf waters on the United States mainland .
2531	Criticism_of_the_IPCC_Fourth_Assessment_Report	"In 1999 New Scientist reported a comment by the leading Indian glaciologist Syed Hasnain, who said in an email interview with this author that all the glaciers in the central and eastern Himalayas could disappear by 2035.	Criticism of the IPCC Fourth Assessment Report The IPCC Fourth Assessment Report ( AR4 ) is a report on climate change created with the help of a large number of contributors , both scientists and governmental representatives . There has been considerable political controversy over a small number of errors found in the report , and there have been calls for review of the process used to formulate the report . The overwhelming majority view of scientists with expertise in climate change is that errors , when found , are corrected , and the issues as identified do not undermine the conclusions of the report that the climate system is warming in response to increased levels of greenhouse gases , largely due to human activities .
957	Arctic_Ocean	ever since December temperatures in the Arctic have consistently been lower than minus 20 C	Arctic Ocean The Arctic Ocean is the smallest and shallowest of the world 's five major oceans . The International Hydrographic Organization ( IHO ) recognizes it as an ocean , although some oceanographers call it the Arctic Mediterranean Sea or simply the Arctic Sea , classifying it a mediterranean sea or an estuary of the Atlantic Ocean . Alternatively , the Arctic Ocean can be seen as the northernmost part of the all-encompassing World Ocean . Located mostly in the Arctic north polar region in the middle of the Northern Hemisphere , the Arctic Ocean is almost completely surrounded by Eurasia and North America . It is partly covered by sea ice throughout the year and almost completely in winter . The Arctic Ocean 's surface temperature and salinity vary seasonally as the ice cover melts and freezes ; its salinity is the lowest on average of the five major oceans , due to low evaporation , heavy fresh water inflow from rivers and streams , and limited connection and outflow to surrounding oceanic waters with higher salinities . The summer shrinking of the ice has been quoted at 50 % . The US National Snow and Ice Data Center ( NSIDC ) uses satellite data to provide a daily record of Arctic sea ice cover and the rate of melting compared to an average period and specific past years .
2029	Climate_change_feedback	Bill Gates claims pandemic's 'misery' will 'happen regularly' if climate change is not stopped	Climate change feedback Climate change feedback is important in the understanding of global warming because feedback processes may amplify or diminish the effect of each climate forcing , and so play an important part in determining the climate sensitivity and future climate state . Feedback in general is the process in which changing one quantity changes a second quantity , and the change in the second quantity in turn changes the first . Positive feedback amplifies the change in the first quantity while negative feedback reduces it . The term `` forcing '' means a change which may `` push '' the climate system in the direction of warming or cooling . An example of a climate forcing is increased atmospheric concentrations of greenhouse gases . By definition , forcings are external to the climate system while feedbacks are internal ; in essence , feedbacks represent the internal processes of the system . Some feedbacks may act in relative isolation to the rest of the climate system ; others may be tightly coupled ; hence it may be difficult to tell just how much a particular process contributes . Forcings , feedbacks and the dynamics of the climate system determine how much and how fast the climate changes . The main positive feedback in global warming is the tendency of warming to increase the amount of water vapor in the atmosphere , which in turn leads to further warming . The main negative feedback comes from the Stefan -- Boltzmann law , the amount of heat radiated from the Earth into space changes with the fourth power of the temperature of Earth 's surface and atmosphere . Some observed and potential effects of global warming are positive feedbacks , which contribute directly to further global warming . The Intergovernmental Panel on Climate Change 's ( IPCC ) Fourth Assessment Report states that `` Anthropogenic warming could lead to some effects that are abrupt or irreversible , depending upon the rate and magnitude of the climate change . ''
1649	Urban_heat_island	Urban and rural regions show the same warming trend.	Urban heat island An urban heat island ( UHI ) is an urban area or metropolitan area that is significantly warmer than its surrounding rural areas due to human activities . The temperature difference usually is larger at night than during the day , and is most apparent when winds are weak . UHI is most noticeable during the summer and winter . The main cause of the urban heat island effect is from the modification of land surfaces . Waste heat generated by energy usage is a secondary contributor . As a population center grows , it tends to expand its area and increase its average temperature . The less-used term heat island refers to any area , populated or not , which is consistently hotter than the surrounding area . Monthly rainfall is greater downwind of cities , partially due to the UHI . Increases in heat within urban centers increases the length of growing seasons , and decreases the occurrence of weak tornadoes . The UHI decreases air quality by increasing the production of pollutants such as ozone , and decreases water quality as warmer waters flow into area streams and put stress on their ecosystems . Not all cities have a distinct urban heat island . Mitigation of the urban heat island effect can be accomplished through the use of green roofs and the use of lighter-colored surfaces in urban areas , which reflect more sunlight and absorb less heat . There are concerns raised about possible contribution from urban heat islands to global warming . Research on China and India indicates that urban heat island effect contributes to climate warming by about 30 % . On the other hand , one 1999 comparison between urban and rural areas proposed that the urban heat island effects have little influence on global mean temperature trends . Many studies reveal increases in the severity of the effect with the progress of climate change .
1645	Global_warming	Cosmic rays show no trend over the last 30 years & have had little impact on recent global warming.	Global warming Global warming , also referred to as climate change , is the observed century-scale rise in the average temperature of the Earth 's climate system and its related effects . Multiple lines of scientific evidence show that the climate system is warming . Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record which extends back to the mid 19th century , and in paleoclimate proxy records over thousands of years . In 2013 , the Intergovernmental Panel on Climate Change ( IPCC ) Fifth Assessment Report concluded that `` It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century . '' The largest human influence has been emission of greenhouse gases such as carbon dioxide , methane and nitrous oxide . Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to for their lowest emissions scenario and 2.6 to for the highest emissions scenario . These findings have been recognized by the national science academies of the major industrialized nations and are not disputed by any scientific body of national or international standing . Future climate change and associated impacts will differ from region to region around the globe . Anticipated effects include warming global temperature , rising sea levels , changing precipitation , and expansion of deserts in the subtropics . Warming is expected to be greater over land than over the oceans and greatest in the Arctic , with the continuing retreat of glaciers , permafrost and sea ice . Other likely changes include more frequent extreme weather events including heat waves , droughts , heavy rainfall with floods and heavy snowfall ; ocean acidification ; and species extinctions due to shifting temperature regimes . Effects significant to humans include the threat to food security from decreasing crop yields and the abandonment of populated areas due to rising sea levels . Because the climate system has a large `` inertia '' and greenhouse gases will stay in the atmosphere for a long time , many of these effects will not only exist for decades or centuries , but will persist for tens of thousands of years . Possible societal responses to global warming include mitigation by emissions reduction , adaptation to its effects , building systems resilient to its effects , and possible future climate engineering . Most countries are parties to the United Nations Framework Convention on Climate Change ( UNFCCC ) , whose ultimate objective is to prevent dangerous anthropogenic climate change . Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 C-change relative to pre-industrial levels , with efforts made to limit warming to 1.5 C-change . Public reactions to global warming and concern about its effects are also increasing . A global 2015 Pew Research Center report showed a median of 54 % consider it `` a very serious problem '' . There are significant regional differences , with Americans and Chinese ( whose economies are responsible for the greatest annual CO2 emissions ) among the least concerned .
1698	Scientific_consensus_on_climate_change	Around 97% of climate experts agree that humans are causing global warming.	Scientific consensus on climate change There is currently a strong scientific consensus that the Earth is warming and that this warming is mainly caused by human activities. This consensus is supported by various studies of scientists' opinions and by position statements of scientific organizations, many of which explicitly agree with the Intergovernmental Panel on Climate Change (IPCC) synthesis reports. Nearly all actively publishing climate scientists (97–98%) support the consensus on anthropogenic climate change, and the remaining 2% of contrarian studies either cannot be replicated or contain errors.
1164	Extreme_weather	Hurricanes, tornadoes, floods, droughts and other natural disasters have yet to show any obvious long-term change."	Extreme weather Extreme weather includes unexpectable , unusual , unpredictable severe or unseasonal weather ; weather at the extremes of the historical distribution -- the range that has been seen in the past . Often , extreme events are based on a location 's recorded weather history and defined as lying in the most unusual ten percent . In recent years some extreme weather events have been attributed to human-induced global warming , with studies indicating an increasing threat from extreme weather in the future .
2835	Global_warming	Arctic summer sea ice has shrunk by an area equal to Western Australia, and might be all gone in a decade.	Global warming Global warming , also referred to as climate change , is the observed century-scale rise in the average temperature of the Earth 's climate system and its related effects . Multiple lines of scientific evidence show that the climate system is warming . Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record which extends back to the mid 19th century , and in paleoclimate proxy records over thousands of years . In 2013 , the Intergovernmental Panel on Climate Change ( IPCC ) Fifth Assessment Report concluded that `` It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century . '' The largest human influence has been emission of greenhouse gases such as carbon dioxide , methane and nitrous oxide . Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to for their lowest emissions scenario and 2.6 to for the highest emissions scenario . These findings have been recognized by the national science academies of the major industrialized nations and are not disputed by any scientific body of national or international standing . Future climate change and associated impacts will differ from region to region around the globe . Anticipated effects include warming global temperature , rising sea levels , changing precipitation , and expansion of deserts in the subtropics . Warming is expected to be greater over land than over the oceans and greatest in the Arctic , with the continuing retreat of glaciers , permafrost and sea ice . Other likely changes include more frequent extreme weather events including heat waves , droughts , heavy rainfall with floods and heavy snowfall ; ocean acidification ; and species extinctions due to shifting temperature regimes . Effects significant to humans include the threat to food security from decreasing crop yields and the abandonment of populated areas due to rising sea levels . Because the climate system has a large `` inertia '' and greenhouse gases will stay in the atmosphere for a long time , many of these effects will not only exist for decades or centuries , but will persist for tens of thousands of years . Possible societal responses to global warming include mitigation by emissions reduction , adaptation to its effects , building systems resilient to its effects , and possible future climate engineering . Most countries are parties to the United Nations Framework Convention on Climate Change ( UNFCCC ) , whose ultimate objective is to prevent dangerous anthropogenic climate change . Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 C-change relative to pre-industrial levels , with efforts made to limit warming to 1.5 C-change . Public reactions to global warming and concern about its effects are also increasing . A global 2015 Pew Research Center report showed a median of 54 % consider it `` a very serious problem '' . There are significant regional differences , with Americans and Chinese ( whose economies are responsible for the greatest annual CO2 emissions ) among the least concerned .
917	Antarctica	Because the collapse of vulnerable parts of the ice sheet could raise the sea level dramatically, the continued existence of the world's great coastal cities — Miami, New York, Shanghai and many more — is tied to Antarctica's fate.	Antarctica Antarctica ( UK English -LSB- ænˈtɑːktɪkə -RSB- or -LSB- ænˈtɑːtɪkə -RSB- , US English -LSB- æntˈɑːrktɪkə -RSB- ) is Earth 's southernmost continent . It contains the geographic South Pole and is situated in the Antarctic region of the Southern Hemisphere , almost entirely south of the Antarctic Circle , and is surrounded by the Southern Ocean . At 14000000 km2 , it is the fifth-largest continent . For comparison , Antarctica is nearly twice the size of Australia . About 98 % of Antarctica is covered by ice that averages 1.9 km in thickness , which extends to all but the northernmost reaches of the Antarctic Peninsula . Antarctica , on average , is the coldest , driest , and windiest continent , and has the highest average elevation of all the continents . Antarctica is a desert , with annual precipitation of only 200 mm ( 8 in ) along the coast and far less inland . The temperature in Antarctica has reached − 89.2 ° C ( − 128.6 ° F ) , though the average for the third quarter ( the coldest part of the year ) is − 63 ° C ( − 81 ° F ) . Anywhere from 1,000 to 5,000 people reside throughout the year at the research stations scattered across the continent . Organisms native to Antarctica include many types of algae , bacteria , fungi , plants , protista , and certain animals , such as mites , nematodes , penguins , seals and tardigrades . Vegetation , where it occurs , is tundra . Although myths and speculation about a Terra Australis ( `` Southern Land '' ) date back to antiquity , Antarctica is noted as the last region on Earth in recorded history to be discovered and colonised by humans , being only first sighted in 1820 by the Russian expedition of Fabian Gottlieb von Bellingshausen and Mikhail Lazarev on Vostok and Mirny , who sighted the Fimbul ice shelf . The continent , however , remained largely neglected for the rest of the 19th century because of its hostile environment , lack of easily accessible resources , and isolation . In 1895 , the first confirmed landing was conducted by a team of Norwegians . Antarctica is a de facto condominium , governed by parties to the Antarctic Treaty System that have consulting status . Twelve countries signed the Antarctic Treaty in 1959 , and thirty-eight have signed it since then . The treaty prohibits military activities and mineral mining , prohibits nuclear explosions and nuclear waste disposal , supports scientific research , and protects the continent 's ecozone . Ongoing experiments are conducted by more than 4,000 scientists from many nations .
2011	Green_Climate_Fund	U.S. Pays $1 Billion into Green Climate Fund, Top Polluters Pay Nothing	Green Climate Fund The Green Climate Fund ( GCF ) is a fund within the framework of the UNFCCC founded as a mechanism to assist developing countries in adaptation and mitigation practices to counter climate change . The GCF is based in the new Songdo district of Incheon , South Korea . It is governed by a Board of 24 members and initially supported by a Secretariat . `` The Green Climate Fund will support projects , programmes , policies and other activities in developing country Parties using thematic funding windows '' . It is intended to be the centrepiece of efforts to raise Climate Finance of $ 100 billion a year by 2020 . This is not an official figure for the size of the Fund itself , however . Disputes also remain as to whether the funding target will be based on public sources , or whether `` leveraged '' private finance will be counted towards the total . A total of US$ 10.3 billion has been pledged so far , which is meant to cover investments over a four year period . Only a fraction of this sum had been pledged as of July 2013 , mostly to cover start-up costs . According to the Climate & Development Knowledge Network , at the third meeting of the Board in Berlin in March 2013 , members agreed on how to move forward with the fund 's Business Model Framework ( BMF ) . They identified the need to assess various options for how nations could access the fund , approaches for involving the private sector , plus ways to measure results and ensure requests for monies are country-driven . At the fourth Board meeting in Songdo , South Korea , in June 2013 , Hela Cheikhrouhou , a Tunisian national , was selected to become the Fund 's first Executive Director . Cheikhrouhou left the Fund in September 201
2803	Earth	When we do the calculations and include all radiative forcings and the amount of heat being absorbed by the oceans, it shows that the Earth has warmed almost exactly as much as we would expect.	Earth Earth ( from Eorðe -LSB- Γαῖα , Gaia -RSB- Terra ) , otherwise known as the World or the Globe , is the third planet from the Sun and the only object in the Universe known to harbor life . It is the densest planet in the Solar System and the largest of the four terrestrial planets . According to radiometric dating and other sources of evidence , Earth formed about 4.54 billion years ago . Earth 's gravity interacts with other objects in space , especially the Sun and the Moon , Earth 's only natural satellite . During one orbit around the Sun , Earth rotates about its axis over 365 times ; thus , an Earth year is about 365.26 days long . Earth 's axis of rotation is tilted , producing seasonal variations on the planet 's surface . The gravitational interaction between the Earth and Moon causes ocean tides , stabilizes the Earth 's orientation on its axis , and gradually slows its rotation . Earth 's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years . About 71 % of Earth 's surface is covered with water , mostly by its oceans . The remaining 29 % is land consisting of continents and islands that together have many lakes , rivers and other sources of water that contribute to the hydrosphere . The majority of Earth 's polar regions are covered in ice , including the Antarctic ice sheet and the sea ice of the Arctic ice pack . Earth 's interior remains active with a solid iron inner core , a liquid outer core that generates the Earth 's magnetic field , and a convecting mantle that drives plate tectonics . Within the first billion years of Earth 's history , life appeared in the oceans and began to affect the Earth 's atmosphere and surface , leading to the proliferation of aerobic and anaerobic organisms . Some geological evidence indicates that life may have arisen as much as 4.1 billion years ago . Since then , the combination of Earth 's distance from the Sun , physical properties , and geological history have allowed life to evolve and thrive . In the history of the Earth , biodiversity has gone through long periods of expansion , occasionally punctuated by mass extinction events . Over 99 % of all species that ever lived on Earth are extinct . Estimates of the number of species on Earth today vary widely ; most species have not been described . Over 7.4 billion humans live on Earth and depend on its biosphere and minerals for their survival . Humans have developed diverse societies and cultures ; politically , the world has about 200 sovereign states .
435	2019_in_science	NOAA's analysis found last month was the 3rd-warmest April on record globally.	2019 in science A number of significant scientific events occurred in 2019.
307	Palm_oil	For instance, wind turbines kill birds and insects, and palm-oil plantations destroy the biodiversity of the rainforests	Palm oil Palm oil ( also known as dendê oil , from Portuguese -LSB- ˈdɛnde -RSB- ) is an edible vegetable oil derived from the mesocarp ( reddish pulp ) of the fruit of the oil palms , primarily the African oil palm Elaeis guineensis , and to a lesser extent from the American oil palm Elaeis oleifera and the maripa palm Attalea maripa . Palm oil is naturally reddish in color because of a high beta-carotene content . It is not to be confused with palm kernel oil derived from the kernel of the same fruit , or coconut oil derived from the kernel of the coconut palm ( Cocos nucifera ) . The differences are in color ( raw palm kernel oil lacks carotenoids and is not red ) , and in saturated fat content : palm mesocarp oil is 49 % saturated , while palm kernel oil and coconut oil are 81 % and 86 % saturated fats , respectively . However , crude red palm oil that has been refined , bleached and deodorized , a common commodity called RBD palm oil , does not contain carotenoids . Along with coconut oil , palm oil is one of the few highly saturated vegetable fats and is semisolid at room temperature . Palm oil is a common cooking ingredient in the tropical belt of Africa , Southeast Asia and parts of Brazil . Its use in the commercial food industry in other parts of the world is widespread because of its lower cost and the high oxidative stability ( saturation ) of the refined product when used for frying . One source reported that humans consumed an average 17 lb of palm oil per person in 2015 . The use of palm oil in food products has attracted the concern of environmental activist groups ; the high oil yield of the trees has encouraged wider cultivation , leading to the clearing of forests in parts of Indonesia and Malaysia to make space for oil-palm monoculture . This has resulted in significant acreage losses of the natural habitat of the orangutan , of which both species are endangered ; one species in particular , the Sumatran orangutan , has been listed as critically endangered . In 2004 , an industry group called the Roundtable on Sustainable Palm Oil was formed to work with the palm oil industry to address these concerns . Additionally , in 1992 , in response to concerns about deforestation , the Government of Malaysia pledged to limit the expansion of palm oil plantations by retaining a minimum of half the nation 's land as forest cover .
1260	Tropical_monsoon_climate	The contrast in precipitation between wet and dry regions and between wet and dry seasons will increase, although there may be regional exceptions.	Tropical monsoon climate A Tropical monsoon climate , occasionally known as a tropical wet climate or a tropical monsoon and trade-wind littoral climate , is a type of climate that corresponds to the Köppen climate classification category `` Am '' . Tropical monsoon climates have monthly mean temperatures above 18 ° C in every month of the year and feature wet and dry seasons , as Tropical savanna climates do . Tropical monsoon climates however features its driest month seeing on average less than 60 mm but more than 100 -- -LSB- total annual precipitation -LCB- mm -RCB- / 25 -RSB- of precipitation . This latter fact is in direct contrast to a tropical savanna climate , whose driest month sees less than 60 mm of precipitation and also less than 100 -- -LSB- total annual precipitation -LCB- mm -RCB- / 25 -RSB- of precipitation . In essence , a tropical monsoon climate tends to either see more rainfall than a tropical savanna climate or have less pronounced dry seasons . Additionally , a tropical monsoon climate tends to see less variance in temperatures during the course of the year than a tropical savanna climate . This climate has a driest month which nearly always occurs at or soon after the `` winter '' solstice for that side of the equator .
1539	Henrik_Svensmark	Climate change is due to cosmic rays.	Henrik Svensmark Henrik Svensmark ( born 1958 ) is a physicist and professor in the Division of Solar System Physics at the Danish National Space Institute ( DTU Space ) in Copenhagen . He is known for his theory on the effects of cosmic rays on cloud formation as an indirect cause of global warming . He detailed his work in the book The Chilling Stars as well as the film The Cloud Mystery .
1834	Carbon_dioxide_in_Earth's_atmosphere	A 14 August 1912 article from a New Zealand newspaper contained a brief story about how burning coal might produce future warming by adding carbon dioxide to the atmosphere.	Carbon dioxide in Earth's atmosphere Carbon dioxide is an important trace gas in Earth 's atmosphere . Currently it constitutes about 0.041 % ( equal to 410 parts per million ; ppm ) by volume of the atmosphere . Despite its relatively small concentration is a potent greenhouse gas and plays a vital role in regulating Earth 's surface temperature through radiative forcing and the greenhouse effect . Reconstructions show that concentrations of in the atmosphere have varied , ranging from as high as 7,000 ppm during the Cambrian period about 500 million years ago to as low as 180 ppm during the Quaternary glaciation of the last two million years . Carbon dioxide is an integral part of the carbon cycle , a biogeochemical cycle in which carbon is exchanged between the Earth 's oceans , soil , rocks and the biosphere . Plants and other photoautotrophs use solar energy to produce carbohydrate from atmospheric carbon dioxide and water by photosynthesis . Almost all other organisms depend on carbohydrate derived from photosynthesis as their primary source of energy and carbon compounds . The current episode of global warming is attributed to increasing emissions of and other greenhouse gases into Earth 's atmosphere . The global annual mean concentration of in the atmosphere has increased by more than 40 % since the start of the Industrial Revolution , from 280 ppm , the level it had for the last 10,000 years leading up to the mid-18th century , to 399 ppm as of 2015 . The present concentration is the highest in at least the past 800,000 years and likely the highest in the past 20 million years . The increase has been caused by anthropogenic sources , particularly the burning of fossil fuels and deforestation . The daily average concentration of atmospheric CO2 at Mauna Loa Observatory first exceeded 400 ppm on 10 May 2013 . It is currently rising at a rate of approximately 2 ppm/year and accelerating . An estimated 30 -- 40 % of the released by humans into the atmosphere dissolves into oceans , rivers and lakes , which contributes to ocean acidification .
2238	Effects_of_global_warming	"An article in Science magazine illustrated that a rise in carbon dioxide did not precede a rise in temperatures, but actually lagged behind temperature rises by 200 to 1000 years.	Effects of global warming The effects of global warming are the environmental and social changes caused ( directly or indirectly ) by human emissions of greenhouse gases . There is a scientific consensus that climate change is occurring , and that human activities are the primary driver . Many impacts of climate change have already been observed , including glacier retreat , changes in the timing of seasonal events ( e.g. , earlier flowering of plants ) , and changes in agricultural productivity . Future effects of climate change will vary depending on climate change policies and social development . The two main policies to address climate change are reducing human greenhouse gas emissions ( climate change mitigation ) and adapting to the impacts of climate change . Geoengineering is another policy option . Near-term climate change policies could significantly affect long-term climate change impacts . Stringent mitigation policies might be able to limit global warming ( in 2100 ) to around 2 ° C or below , relative to pre-industrial levels . Without mitigation , increased energy demand and extensive use of fossil fuels might lead to global warming of around 4 ° C. Higher magnitudes of global warming would be more difficult to adapt to , and would increase the risk of negative impacts .
1299	Effects_of_global_warming_on_humans	A recent Nature study expecting more severe hurricanes from global warming still found that damages would halve from 0.04 per cent to 0.02 per cent of global GDP, because the increased ferocity would be more than made up by increased prosperity and resilience.	Effects of global warming on humans Climate change has brought about possibly permanent alterations to Earth 's geological , biological and ecological systems . These changes have led to the emergence of large-scale environmental hazards to human health , such as extreme weather , ozone depletion , increased danger of wildland fires , loss of biodiversity , stresses to food-producing systems and the global spread of infectious diseases . The World Health Organization ( WHO ) estimates that 160,000 deaths , since 1950 , are directly attributable to climate change . Many believe this to be a conservative estimate . To date , a neglected aspect of the climate change debate , much less research has been conducted on the impacts of climate change on health , food supply , economic growth , migration , security , societal change , and public goods , such as drinking water , than on the geophysical changes related to global warming . Human impacts can be both negative and positive . Climatic changes in Siberia , for instance , are expected to improve food production and local economic activity , at least in the short to medium term . Numerous studies suggest , however , that the current and future impacts of climate change on human society are and will continue to be overwhelmingly negative . The majority of the adverse effects of climate change are experienced by poor and low-income communities around the world , who have much higher levels of vulnerability to environmental determinants of health , wealth and other factors , and much lower levels of capacity available for coping with environmental change . A report on the global human impact of climate change published by the Global Humanitarian Forum in 2009 , estimated more than 300,000 deaths and about $ 125 billion in economic losses each year , and indicating that most climate change induced mortality is due to worsening floods and droughts in developing countries .
2602	Climate_change_denial	If the public were aware that man-made CO2 is so incredibly small there would be very little belief in a climate disaster ..."	Climate change denial Climate change denial , or global warming denial , is part of the global warming controversy . It involves denial , dismissal , unwarranted doubt or contrarian views which strongly depart from the scientific opinion on climate change , including the extent to which it is caused by humans , its impacts on nature and human society , or the potential of adaptation to global warming by human actions . Some deniers do endorse the term , but others often prefer the term climate change skepticism , although this is a misnomer for those who deny anthropogenic global warming . In effect , the two terms form a continuous , overlapping range of views , and generally have the same characteristics : both reject , to a greater or lesser extent , mainstream scientific opinion on climate change . Climate change denial can also be implicit , when individuals or social groups accept the science but fail to come to terms with it or to translate their acceptance into action . Several social science studies have analyzed these positions as forms of denialism . Campaigning to undermine public trust in climate science has been described as a `` denial machine '' of industrial , political and ideological interests , supported by conservative media and skeptical bloggers in manufacturing uncertainty about global warming . In the public debate , phrases such as climate skepticism have frequently been used with the same meaning as climate denialism . The labels are contested : those actively challenging climate science commonly describe themselves as `` skeptics '' , but many do not comply with common standards of scientific skepticism and , regardless of evidence , persistently deny the validity of human caused global warming . Although scientific opinion on climate change is that human activity is extremely likely to be the primary driver of climate change , the politics of global warming have been affected by climate change denial , hindering efforts to prevent climate change and adapt to the warming climate . Those promoting denial commonly use rhetorical tactics to give the appearance of a scientific controversy where there is none . Of the world 's countries , the climate change denial industry is most powerful in the United States . Since January 2015 , the United States Senate Committee on Environment and Public Works has been chaired by oil lobbyist and climate change denier Jim Inhofe . Inhofe is notorious for having called climate change `` the greatest hoax ever perpetrated against the American people '' and for having claimed to have debunked the alleged hoax in February 2015 when he brought a snowball with him in the Senate chamber and tossed it across the floor . Organised campaigning to undermine public trust in climate science is associated with conservative economic policies and backed by industrial interests opposed to the regulation of emissions . Climate change denial has been associated with the fossil fuels lobby , the Koch brothers , industry advocates and libertarian think tanks , often in the United States . More than 90 % of papers sceptical on climate change originate from right-wing think tanks . The total annual income of these climate change counter-movement-organizations is roughly $ 900 million . Between 2002 and 2010 , nearly $ 120 million ( # 77 million ) was anonymously donated via the Donors Trust and Donors Capital Fund to more than 100 organisations seeking to undermine the public perception of the science on climate change . In 2013 the Center for Media and Democracy reported that the State Policy Network ( SPN ) , an umbrella group of 64 U.S. think tanks , had been lobbying on behalf of major corporations and conservative donors to oppose climate change regulation . Since the late 1970s , oil companies have published research broadly in line with the standard views on global warming . Despite this , oil companies organized a climate change denial campaign to disseminate public disinformation for several decades , a strategy that has been compared to the organized denial of the hazards of tobacco smoking by tobacco companies .
2702	Emissions_trading	While it's true that any single country's CO2 emissions reductions will make little difference, only if every nation agrees to limit CO2 emissions can we achieve significant cuts on a global scale.	Emissions trading Emissions trading or cap and trade is a government-mandated , market-based approach to controlling pollution by providing economic incentives for achieving reductions in the emissions of pollutants . In contrast to command-and-control environmental regulations such as best available technology ( BAT ) standards and government subsidies , cap and trade ( CAT ) schemes are a type of flexible environmental regulation that allows organizations to decide how best to meet policy targets . Various countries , states and groups of companies have adopted such trading systems , notably for mitigating climate change . A central authority ( usually a governmental body ) allocates or sells a limited number of permits to discharge specific quantities of a specific pollutant per time period . Polluters are required to hold permits in amount equal to their emissions . Polluters that want to increase their emissions must buy permits from others willing to sell them . Financial derivatives of permits can also be traded on secondary markets . In theory , polluters who can reduce emissions most cheaply will do so , achieving the emission reduction at the lowest cost to society . Cap and trade is meant to provide the private sector with the flexibility required to reduce emissions while stimulating technological innovation and economic growth . There are active trading programs in several air pollutants . For greenhouse gases , which cause climate change , permit units are often called carbon credits . The largest greenhouse gases trading program is the European Union Emission Trading Scheme , which trades primarily in European Union Allowances ( EUAs ) ; the Californian scheme trades in California Carbon Allowances , the New Zealand scheme in New Zealand Units and the Australian scheme in Australian Units . The United States has a national market to reduce acid rain and several regional markets in nitrogen oxides .
1703	Confirmation_bias	Multiple lines of independent evidence indicate humidity is rising and provides positive feedback.	Confirmation bias Confirmation bias , also called confirmatory bias or myside bias , David Perkins , a geneticist , coined the term `` myside bias '' referring to a preference for `` my '' side of an issue . is the tendency to search for , interpret , favor , and recall information in a way that confirms one 's preexisting beliefs or hypotheses . It is a type of cognitive bias and a systematic error of inductive reasoning . People display this bias when they gather or remember information selectively , or when they interpret it in a biased way . The effect is stronger for emotionally charged issues and for deeply entrenched beliefs . People also tend to interpret ambiguous evidence as supporting their existing position . Biased search , interpretation and memory have been invoked to explain attitude polarization ( when a disagreement becomes more extreme even though the different parties are exposed to the same evidence ) , belief perseverance ( when beliefs persist after the evidence for them is shown to be false ) , the irrational primacy effect ( a greater reliance on information encountered early in a series ) and illusory correlation ( when people falsely perceive an association between two events or situations ) . A series of experiments in the 1960s suggested that people are biased toward confirming their existing beliefs . Later work re-interpreted these results as a tendency to test ideas in a one-sided way , focusing on one possibility and ignoring alternatives . In certain situations , this tendency can bias people 's conclusions . Explanations for the observed biases include wishful thinking and the limited human capacity to process information . Another explanation is that people show confirmation bias because they are weighing up the costs of being wrong , rather than investigating in a neutral , scientific way . Confirmation biases contribute to overconfidence in personal beliefs and can maintain or strengthen beliefs in the face of contrary evidence . Poor decisions due to these biases have been found in political and organizational contexts.Tuchman ( 1984 ) described a form of confirmation bias at work in the process of justifying policies to which a government has committed itself : `` Once a policy has been adopted and implemented , all subsequent activity becomes an effort to justify it '' ( p. 245 ) . In the context of a discussion of the policy that drew the United States into war in Vietnam and kept the U.S. military engaged for 16 years despite countless evidences that it was a lost cause from the beginning , Tuchman argued : Wooden-headedness , the source of self-deception is a factor that plays a remarkably large role in government . It consists in assessing a situation in terms of preconceived fixed notions while ignoring or rejecting any contrary signs . It is acting according to wish while not allowing oneself to be deflected by the facts . It is epitomized in a historian 's statement about Philip II of Spain , the surpassing wooden head of all sovereigns : `` no experience of the failure of his policy could shake his belief in essential excellence . '' ( p. 7 ) Folly , she argued , is a form of self-deception characterized by `` insistence on a rooted notion regardless of contrary evidence '' ( p. 209 )
1367	Scientific_consensus_on_climate_change	But we do have other reliable indicators of temperatures before the late 1800s, and the evidence shows temperatures have been warmer than today for most of the past several thousand years, including warmer-than-present temperatures for most of the human civilization time period	Scientific consensus on climate change There is currently a strong scientific consensus that the Earth is warming and that this warming is mainly caused by human activities. This consensus is supported by various studies of scientists' opinions and by position statements of scientific organizations, many of which explicitly agree with the Intergovernmental Panel on Climate Change (IPCC) synthesis reports. Nearly all actively publishing climate scientists (97–98%) support the consensus on anthropogenic climate change, and the remaining 2% of contrarian studies either cannot be replicated or contain errors.
1300	Physical_impacts_of_climate_change	"Yet, a new study of 60 climate models and scenarios shows this warning fails to take into account the fact that global warming will mean precipitation increases.	Physical impacts of climate change This article is about the physical impacts of climate change . For some of these physical impacts , their effect on social and economic systems are also described . This article refers to reports produced by the IPCC . In their usage , `` climate change '' refers to a change in the state of the climate that can be identified by changes in the mean and/or variability of its properties , and that persists for extended periods , typically decades or longer ( IPCC , 2007d :30 ) . The climate change referred to may be due to natural causes and/or the result of human activity .
2390	Sahara	There may have been regions of Greenland that were 'greener' than today	Sahara The Sahara ( الصحراء الكبرى , , ` the Greatest Desert ' ) is the largest hot desert and the third largest desert in the world after Antarctica and the Arctic . Its area of 9200000 km2 is comparable to the area of the United States . The desert comprises much of North Africa , excluding the fertile region on the Mediterranean Sea coast , the Atlas Mountains of the Maghreb , and the Nile Valley in Egypt and Sudan . It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west , where the landscape gradually changes from desert to coastal plains . To the south , it is bounded by the Sahel , a belt of semi-arid tropical savanna around the Niger River valley and the Sudan Region of Sub-Saharan Africa . The Sahara can be divided into several regions including : the western Sahara , the central Ahaggar Mountains , the Tibesti Mountains , the Aïr Mountains , the Ténéré desert , and the Libyan Desert . The name ` Sahara ' is derived from ( , pronounced -LSB- / / ˈSaHa : ra : -RSB- ) , the plural of the Arabic word for `` desert '' .
2741	Hockey_stick_graph	'Phil Jones said that for the past 15 years there has been no "statistically significant" warming.	Hockey stick graph Hockey stick graphs present the global or hemispherical mean temperature record of the past 500 to 2000 years as shown by quantitative climate reconstructions based on climate proxy records . These reconstructions have consistently shown a slow long term cooling trend changing into relatively rapid warming in the 20th century , with the instrumental temperature record by 2000 exceeding earlier temperatures . The term `` hockey stick graph '' was coined by the climatologist Jerry Mahlman , to describe the pattern shown by the ( MBH99 ) reconstruction , envisaging a graph that is relatively flat with a downward trend to 1900 as forming an ice hockey stick 's `` shaft '' followed by a sharp , steady increase corresponding to the `` blade '' portion . The reconstructions have featured in Intergovernmental Panel on Climate Change ( IPCC ) reports as evidence of global warming . Arguments over the reconstructions have been taken up by fossil fuel industry funded lobbying groups attempting to cast doubt on climate science . Paleoclimatology dates back to the 19th century , and the concept of examining varves in lake beds and tree rings to track local climatic changes was suggested in the 1930s . In the 1960s , Hubert Lamb generalised from historical documents and temperature records of central England to propose a Medieval Warm Period from around 900 to 1300 , followed by Little Ice Age . This was the basis of a `` schematic diagram '' featured in the IPCC First Assessment Report of 1990 beside cautions that the medieval warming might not have been global . The use of indicators to get quantitative estimates of the temperature record of past centuries was developed , and by the late 1990s a number of competing teams of climatologists found indications that recent warming was exceptional . introduced the `` Composite Plus Scaling '' ( CPS ) method used by most later large scale reconstructions . Their study was featured in the IPCC Second Assessment Report of 1995 . In 1998 Michael E. Mann , Raymond S. Bradley and Malcolm K. Hughes developed new statistical techniques to produce ( MBH98 ) , the first eigenvector-based climate field reconstruction ( CFR ) . This showed global patterns of annual surface temperature , and included a graph of average hemispheric temperatures back to 1400 with shading emphasising that uncertainties ( to two standard error limits ) were much greater in earlier centuries . independently produced a CPS reconstruction extending back for a thousand years , and ( MBH99 ) used the MBH98 methodology to extend their study back to 1000 . A version of the MBH99 graph was featured prominently in the 2001 IPCC Third Assessment Report ( TAR ) , which also drew on Jones et al. 1998 and three other reconstructions to support the conclusion that , in the Northern Hemisphere , the 1990s was likely to have been the warmest decade and 1998 the warmest year during the past 1,000 years . The graph became a focus of dispute for those opposed to the strengthening scientific consensus that late 20th century warmth was exceptional . In 2003 , as lobbying over the 1997 Kyoto Protocol intensified , a paper claiming greater medieval warmth was quickly dismissed by scientists in the Soon and Baliunas controversy . Later in 2003 , Stephen McIntyre and Ross McKitrick published disputing the data used in MBH98 paper . In 2004 Hans von Storch published criticism of the statistical techniques as tending to underplay variations in earlier parts of the graph , though this was disputed and he later accepted that the effect was very small . In 2005 McIntyre and McKitrick published criticisms of the principal components analysis methodology as used in MBH98 and MBH99 . Their analysis was subsequently disputed by published papers including and which pointed to errors in the McIntyre and McKitrick methodology . Political disputes led to the formation of a panel of scientists convened by the National Research Council , their North Report in 2006 supported Mann 's findings with some qualifications , including agreeing that there were some statistical failings but these had little effect on the result . More than two dozen reconstructions , using various statistical methods and combinations of proxy records , support the broad consensus shown in the original 1998 hockey-stick graph , with variations in how flat the pre-20th century `` shaft '' appears . The 2007 IPCC Fourth Assessment Report cited 14 reconstructions , 10 of which covered 1,000 years or longer , to support its strengthened conclusion that it was likely that Northern Hemisphere temperatures during the 20th century were the highest in at least the past 1,300 years . Further reconstructions , including Mann et al. 2008 and , have supported these general conclusions .
1722	Global_warming	Humans are small but powerful, and human CO2 emissions are causing global warming.	Global warming Global warming , also referred to as climate change , is the observed century-scale rise in the average temperature of the Earth 's climate system and its related effects . Multiple lines of scientific evidence show that the climate system is warming . Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record which extends back to the mid 19th century , and in paleoclimate proxy records over thousands of years . In 2013 , the Intergovernmental Panel on Climate Change ( IPCC ) Fifth Assessment Report concluded that `` It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century . '' The largest human influence has been emission of greenhouse gases such as carbon dioxide , methane and nitrous oxide . Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to for their lowest emissions scenario and 2.6 to for the highest emissions scenario . These findings have been recognized by the national science academies of the major industrialized nations and are not disputed by any scientific body of national or international standing . Future climate change and associated impacts will differ from region to region around the globe . Anticipated effects include warming global temperature , rising sea levels , changing precipitation , and expansion of deserts in the subtropics . Warming is expected to be greater over land than over the oceans and greatest in the Arctic , with the continuing retreat of glaciers , permafrost and sea ice . Other likely changes include more frequent extreme weather events including heat waves , droughts , heavy rainfall with floods and heavy snowfall ; ocean acidification ; and species extinctions due to shifting temperature regimes . Effects significant to humans include the threat to food security from decreasing crop yields and the abandonment of populated areas due to rising sea levels . Because the climate system has a large `` inertia '' and greenhouse gases will stay in the atmosphere for a long time , many of these effects will not only exist for decades or centuries , but will persist for tens of thousands of years . Possible societal responses to global warming include mitigation by emissions reduction , adaptation to its effects , building systems resilient to its effects , and possible future climate engineering . Most countries are parties to the United Nations Framework Convention on Climate Change ( UNFCCC ) , whose ultimate objective is to prevent dangerous anthropogenic climate change . Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 C-change relative to pre-industrial levels , with efforts made to limit warming to 1.5 C-change . Public reactions to global warming and concern about its effects are also increasing . A global 2015 Pew Research Center report showed a median of 54 % consider it `` a very serious problem '' . There are significant regional differences , with Americans and Chinese ( whose economies are responsible for the greatest annual CO2 emissions ) among the least concerned .
1024	Scientific_consensus_on_climate_change	"CO2 is certainly a heat-trapping greenhouse gas, but hardly the primary one: Water vapor accounts for about 95 percent of greenhouse gases.	Scientific consensus on climate change There is currently a strong scientific consensus that the Earth is warming and that this warming is mainly caused by human activities. This consensus is supported by various studies of scientists' opinions and by position statements of scientific organizations, many of which explicitly agree with the Intergovernmental Panel on Climate Change (IPCC) synthesis reports. Nearly all actively publishing climate scientists (97–98%) support the consensus on anthropogenic climate change, and the remaining 2% of contrarian studies either cannot be replicated or contain errors.
51	Greenhouse_gas	CO2 does not cause climate change, it RESPONDS to it [...]	Greenhouse gas A greenhouse gas ( abbrev . GHG ) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range . This process is the fundamental cause of the greenhouse effect . The primary greenhouse gases in Earth 's atmosphere are water vapor , carbon dioxide , methane , nitrous oxide , and ozone . Without greenhouse gases , the average temperature of Earth 's surface would be about -18 ° C , rather than the present average of 15 ° C . In the Solar System , the atmospheres of Venus , Mars and Titan also contain gases that cause a greenhouse effect . Human activities since the beginning of the Industrial Revolution ( taken as the year 1750 ) have produced a 40 % increase in the atmospheric concentration of carbon dioxide , from 280 ppm in 1750 to 406 ppm in early 2017 . This increase has occurred despite the uptake of a large portion of the emissions by various natural `` sinks '' involved in the carbon cycle . Anthropogenic carbon dioxide emissions ( i.e. , emissions produced by human activities ) come from combustion of fossil fuels , principally coal , oil , and natural gas , along with deforestation , soil erosion and animal agriculture . It has been estimated that if greenhouse gas emissions continue at the present rate , Earth 's surface temperature could exceed historical values as early as 2047 , with potentially harmful effects on ecosystems , biodiversity and the livelihoods of people worldwide . Recent estimates suggest that on the current emissions trajectory the Earth could pass a threshold of 2 ° C global warming , which the United Nations ' IPCC designated as the upper limit to avoid `` dangerous '' global warming , by 2036 .
2641	Greenhouse_gas	In a paper published online this week in the Journal of Geophysical Research-Atmosphere, economics professor Ross McKitrick says the resulting discrepancies may be leading to an overstatement of the role of greenhouse gases in the atmosphere.	Greenhouse gas A greenhouse gas ( abbrev . GHG ) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range . This process is the fundamental cause of the greenhouse effect . The primary greenhouse gases in Earth 's atmosphere are water vapor , carbon dioxide , methane , nitrous oxide , and ozone . Without greenhouse gases , the average temperature of Earth 's surface would be about -18 ° C , rather than the present average of 15 ° C . In the Solar System , the atmospheres of Venus , Mars and Titan also contain gases that cause a greenhouse effect . Human activities since the beginning of the Industrial Revolution ( taken as the year 1750 ) have produced a 40 % increase in the atmospheric concentration of carbon dioxide , from 280 ppm in 1750 to 406 ppm in early 2017 . This increase has occurred despite the uptake of a large portion of the emissions by various natural `` sinks '' involved in the carbon cycle . Anthropogenic carbon dioxide emissions ( i.e. , emissions produced by human activities ) come from combustion of fossil fuels , principally coal , oil , and natural gas , along with deforestation , soil erosion and animal agriculture . It has been estimated that if greenhouse gas emissions continue at the present rate , Earth 's surface temperature could exceed historical values as early as 2047 , with potentially harmful effects on ecosystems , biodiversity and the livelihoods of people worldwide . Recent estimates suggest that on the current emissions trajectory the Earth could pass a threshold of 2 ° C global warming , which the United Nations ' IPCC designated as the upper limit to avoid `` dangerous '' global warming , by 2036 .
1334	Carbon_dioxide	We simply could never release enough CO2 into the atmosphere to cause the pH to go below 7 [the point in the pH scale at which a solution becomes acidic]."	Carbon dioxide Carbon dioxide ( chemical formula ) is a colorless gas with a density about 60 % higher than that of air ( 1.225 g/L ) that is odorless at normally encountered concentrations . Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms . It occurs naturally in Earth 's atmosphere as a trace gas at a concentration of about 0.04 percent ( 400 ppm ) by volume . Natural sources include volcanoes , hot springs and geysers , and it is freed from carbonate rocks by dissolution in water and acids . Because carbon dioxide is soluble in water , it occurs naturally in groundwater , rivers and lakes , ice caps , glaciers and seawater . It is present in deposits of petroleum and natural gas . As the source of available carbon in the carbon cycle , atmospheric carbon dioxide is the primary carbon source for life on Earth and its concentration in Earth 's pre-industrial atmosphere since late in the Precambrian has been regulated by photosynthetic organisms and geological phenomena . Plants , algae and cyanobacteria use light energy to photosynthesize carbohydrate from carbon dioxide and water , with oxygen produced as a waste product . Carbon dioxide is produced by all aerobic organisms when they metabolize carbohydrates and lipids to produce energy by respiration . It is returned to water via the gills of fish and to the air via the lungs of air-breathing land animals , including humans . Carbon dioxide is produced during the processes of decay of organic materials and the fermentation of sugars in bread , beer and winemaking . It is produced by combustion of wood and other organic materials and fossil fuels such as coal , peat , petroleum and natural gas . It is a versatile industrial material , used , for example , as an inert gas in welding and fire extinguishers , as a pressurizing gas in air guns and oil recovery , as a chemical feedstock and in liquid form as a solvent in decaffeination of coffee and supercritical drying . It is added to drinking water and carbonated beverages including beer and sparkling wine to add effervescence . The frozen solid form of , known as `` dry ice '' is used as a refrigerant and as an abrasive in dry-ice blasting . Carbon dioxide is the most significant long-lived greenhouse gas in Earth 's atmosphere . Since the Industrial Revolution anthropogenic emissions - primarily from use of fossil fuels and deforestation - have rapidly increased its concentration in the atmosphere , leading to global warming . Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid .
519	Little_Ice_Age	Since then, the planet has been cooling on a millennial scale	Little Ice Age The Little Ice Age ( LIA ) was a period of cooling that occurred after the Medieval Warm Period . Although it was not a true ice age , the term was introduced into scientific literature by François E. Matthes in 1939 . It has been conventionally defined as a period extending from the 16th to the 19th centuries , but some experts prefer an alternative timespan from about 1300 to about 1850 . Climatologists and historians working with local records no longer expect to agree on either the start or end dates of the period , which varied according to local conditions . The NASA Earth Observatory notes three particularly cold intervals : one beginning about 1650 , another about 1770 , and the last in 1850 , all separated by intervals of slight warming . The Intergovernmental Panel on Climate Change Third Assessment Report considered the timing and areas affected by the Little Ice Age suggested largely-independent regional climate changes rather than a globally-synchronous increased glaciation . At most , there was modest cooling of the Northern Hemisphere during the period . Several causes have been proposed : cyclical lows in solar radiation , heightened volcanic activity , changes in the ocean circulation , variations in Earth 's orbit and axial tilt ( orbital forcing ) , inherent variability in global climate , and decreases in the human population .
1001	Granger_causality	'This study goes beyond statistical correlations and explores a specific process that can plausibly explain how enhanced high-latitude warming trends may trigger remote weather impacts,' he said.	Granger causality The Granger causality test is a statistical hypothesis test for determining whether one time series is useful in forecasting another , first proposed in 1969 . Ordinarily , regressions reflect `` mere '' correlations , but Clive Granger argued that causality in economics could be tested for by measuring the ability to predict the future values of a time series using prior values of another time series . Since the question of `` true causality '' is deeply philosophical , and because of the post hoc ergo propter hoc fallacy of assuming that one thing preceding another can be used as a proof of causation , econometricians assert that the Granger test finds only `` predictive causality '' . A time series X is said to Granger-cause Y if it can be shown , usually through a series of t-tests and F-tests on lagged values of X ( and with lagged values of Y also included ) , that those X values provide statistically significant information about future values of Y. Granger also stressed that some studies using `` Granger causality '' testing in areas outside economics reached `` ridiculous '' conclusions . `` Of course , many ridiculous papers appeared '' , he said in his Nobel lecture . However , it remains a popular method for causality analysis in time series due to its computational simplicity . The original definition of Granger causality does not account for latent confounding effects and does not capture instantaneous and non-linear causal relationships , though several extensions have been proposed to address these issues .
2171	Microwave_Sounding_Unit_temperature_measurements	UAH atmospheric temperatures prove climate models and/or surface temperature data sets are wrong	Microwave Sounding Unit temperature measurements Microwave Sounding Unit temperature measurements refers to temperature measurement using the Microwave Sounding Unit instrument and is one of several methods of measuring Earth atmospheric temperature from satellites. Microwave measurements have been obtained from the troposphere since 1979, when they were included within NOAA weather satellites, starting with TIROS-N. By comparison, the usable balloon (radiosonde) record begins in 1958 but has less geographic coverage and is less uniform. Microwave brightness measurements do not directly measure temperature. They measure radiances in various wavelength bands, which must then be mathematically inverted to obtain indirect inferences of temperature. The resulting temperature profiles depend on details of the methods that are used to obtain temperatures from radiances. As a result, different groups that have analyzed the satellite data have obtained different temperature trends. Among these groups are Remote Sensing Systems (RSS) and the University of Alabama in Huntsville (UAH). The satellite series is not fully homogeneous – the record is constructed from a series of satellites with similar but not identical instrumentation. The sensors deteriorate over time, and corrections are necessary for satellite drift in orbit. Particularly large differences between reconstructed temperature series occur at the few times when there is little temporal overlap between successive satellites, making intercalibration difficult.
2157	Sustainability	CO2 increase is natural, not human-caused	Sustainability In ecology , sustainability ( from sustain and ability ) is the property of biological systems to remain diverse and productive indefinite #Adjective . Long-lived and healthy wetlands and forests are examples of sustainable biological systems . In more general terms , sustainability is the endurance of systems and processes . The organizing principle for sustainability is sustainable development , which includes the four interconnected domains : ecology , economics , politics and culture . Sustainability science is the study of sustainable development and environmental science . Sustainability can also be defined as a socio-ecological process characterized by the pursuit of a common ideal . An ideal is by definition unattainable in a given time and space . However , by persistently and dynamically approaching it , the process results in a sustainable system . Healthy ecosystems and environments are necessary to the survival of humans and other organisms . Ways of reducing negative human impact are environmentally-friendly chemical engineering , environmental resources management and environmental protection . Information is gained from green chemistry , earth science , environmental science and conservation biology . Ecological economics studies the fields of academic research that aim to address human economies and natural ecosystems . Moving towards sustainability is also a social challenge that entails international and national law , urban planning and transport , local and individual lifestyles and ethical consumerism . Ways of living more sustainably can take many forms from reorganizing living conditions ( e.g. , ecovillages , eco-municipalities and sustainable cities ) , reappraising economic sectors ( permaculture , green building , sustainable agriculture ) , or work practices ( sustainable architecture ) , using science to develop new technologies ( green technologies , renewable energy and sustainable fission and fusion power ) , or designing systems in a flexible and reversible manner , and adjusting individual lifestyles that conserve natural resources . `` The term ` sustainability ' should be viewed as humanity 's target goal of human-ecosystem equilibrium ( homeostasis ) , while ` sustainable development ' refers to the holistic approach and temporal processes that lead us to the end point of sustainability . '' ( 305 ) Despite the increased popularity of the use of the term `` sustainability '' , the possibility that human societies will achieve environmental sustainability has been , and continues to be , questioned -- in light of environmental degradation , climate change , overconsumption , population growth and societies ' pursuit of unlimited economic growth in a closed system .
1547	Greenhouse_gas	Water vapor is the most powerful greenhouse gas.	Greenhouse gas A greenhouse gas ( abbrev . GHG ) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range . This process is the fundamental cause of the greenhouse effect . The primary greenhouse gases in Earth 's atmosphere are water vapor , carbon dioxide , methane , nitrous oxide , and ozone . Without greenhouse gases , the average temperature of Earth 's surface would be about -18 ° C , rather than the present average of 15 ° C . In the Solar System , the atmospheres of Venus , Mars and Titan also contain gases that cause a greenhouse effect . Human activities since the beginning of the Industrial Revolution ( taken as the year 1750 ) have produced a 40 % increase in the atmospheric concentration of carbon dioxide , from 280 ppm in 1750 to 406 ppm in early 2017 . This increase has occurred despite the uptake of a large portion of the emissions by various natural `` sinks '' involved in the carbon cycle . Anthropogenic carbon dioxide emissions ( i.e. , emissions produced by human activities ) come from combustion of fossil fuels , principally coal , oil , and natural gas , along with deforestation , soil erosion and animal agriculture . It has been estimated that if greenhouse gas emissions continue at the present rate , Earth 's surface temperature could exceed historical values as early as 2047 , with potentially harmful effects on ecosystems , biodiversity and the livelihoods of people worldwide . Recent estimates suggest that on the current emissions trajectory the Earth could pass a threshold of 2 ° C global warming , which the United Nations ' IPCC designated as the upper limit to avoid `` dangerous '' global warming , by 2036 .
2903	They	The interesting point is that it also seems each time they come across a new dataset it is simply replaced.	They They is the third-person plural personal pronoun ( subjective case ) in Modern English . It can also be used with singular meaning , particularly in informal contexts , sometimes to avoid specifying the gender of the person referred to .
805	2019–20_Australian_bushfire_season	The answer lies in the summer's record-breaking heat, say wildfire experts.	2019–20 Australian bushfire season The 2019–20 Australian bushfire season, colloquially known as Black Summer, was a period of unusually intense bushfires in many parts of Australia. In June 2019, the Queensland Fire and Emergency Service acting director warned of the potential for an early start to the bushfire season which normally starts in August. The warning was based on the Northern Australia bushfire seasonal outlook noting exceptional dry conditions and a lack of soil moisture, combined with early fires in central Queensland. Throughout the summer, hundreds of fires burnt, mainly in the southeast of the country. The major fires peaked during December–January. As of 9 March 2020, the fires burnt an estimated 18.6 million hectares (46 million acres; 186,000 square kilometres; 72,000 square miles), destroyed over 5,900 buildings (including 2,779 homes) and killed at least 34 people. Nearly three billion terrestrial vertebrates alone – the vast majority being reptiles – were affected and some endangered species were believed to be driven to extinction. At its peak, air quality dropped to hazardous levels in all southern and eastern states. The cost of dealing with the bushfires is expected to exceed the A$4.4 billion of the 2009 Black Saturday fires, and tourism sector revenues fell by more than A$1 billion. However, economists estimated that the Australian bushfires may cost over A$103 billion in property damage and economic losses, making the bushfires Australia's costliest natural disaster to date. Nearly 80 percent of Australians were affected either directly or indirectly by the bushfires. By 7 January 2020, the smoke had moved approximately 11,000 kilometres (6,800 mi) across the South Pacific Ocean to Chile and Argentina. As of 2 January 2020, NASA estimated that 306 million tonnes (337 million short tons) of CO2 had been emitted.From September 2019 to March 2020, fires heavily impacted various regions of the state of New South Wales. In eastern and north-eastern Victoria large areas of forest burnt out of control for four weeks before the fires emerged from the forests in late December. Multiple states of emergency were declared across New South Wales, Victoria, and the Australian Capital Territory. Reinforcements from all over Australia were called in to assist fighting the fires and relieve exhausted local crews in New South Wales. The Australian Defence Force was mobilised to provide air support to the firefighting effort and to provide manpower and logistical support. Firefighters, supplies and equipment from Canada, New Zealand, Singapore and the United States, among others, helped fight the fires, especially in New South Wales.During the ensuing crisis, an air tanker and two helicopters crashed during firefighting operations, the air tanker crash resulting in the deaths of the three crew. Two fire trucks were caught in fatal incidents caused directly by fire conditions, killing three fire fighters.By 4 March 2020, all fires in New South Wales had been extinguished completely (to the point where there were no fires in the state for the first time since July 2019), and the Victoria fires had all been contained. The last fire of the season occurred in Lake Clifton, Western Australia, in early May.There has been considerable debate regarding the underlying cause of the intensity and scale of the fires, including the role of fire management practices and climate change, which during the peak of the crisis attracted significant international attention. Politicians visiting fire impacted areas received mixed responses, in particular Prime Minister Scott Morrison. An estimated A$500 million was donated by the public at large, international organisations, public figures and celebrities for victim relief and wildlife recovery. Convoys of donated food, clothing and livestock feed were sent to affected areas.
728	Scientific_consensus_on_climate_change	The sea was much colder than previously thought, the study suggests, indicating that climate change is advancing at an unprecedented rate"	Scientific consensus on climate change There is currently a strong scientific consensus that the Earth is warming and that this warming is mainly caused by human activities. This consensus is supported by various studies of scientists' opinions and by position statements of scientific organizations, many of which explicitly agree with the Intergovernmental Panel on Climate Change (IPCC) synthesis reports. Nearly all actively publishing climate scientists (97–98%) support the consensus on anthropogenic climate change, and the remaining 2% of contrarian studies either cannot be replicated or contain errors.
803	Global_warming_controversy	The team of climate scientists notes that in failing to predict the warming 'hiatus' in the beginning of the 21st century, the Intergovernmental Panel on Climate Change (IPCC) models overestimated temperature increases…	Global warming controversy The global warming controversy concerns the public debate over whether global warming is occurring , how much has occurred in modern times , what has caused it , what its effects will be , whether any action should be taken to curb it , and if so what that action should be . In the scientific literature , there is a strong consensus that global surface temperatures have increased in recent decades and that the trend is caused by human-induced emissions of greenhouse gases . No scientific body of national or international standing disagrees with this view , though a few organizations with members in extractive industries hold non-committal positions . Disputes over the key scientific facts of global warming are more prevalent in the media than in the scientific literature , where such issues are treated as resolved , and such disputes are more prevalent in the United States than globally . Political and popular debate concerning the existence and cause of climate change includes the reasons for the increase seen in the instrumental temperature record , whether the warming trend exceeds normal climatic variations , and whether human activities have contributed significantly to it . Scientists have resolved these questions decisively in favour of the view that the current warming trend exists and is ongoing , that human activity is the cause , and that it is without precedent in at least 2000 years . Public disputes that also reflect scientific debate include estimates of how responsive the climate system might be to any given level of greenhouse gases ( climate sensitivity ) , how global climate change will play out at local and regional scales , and what the consequences of global warming will be . Global warming remains an issue of widespread political debate , often split along party political lines , especially in the United States . Many of the issues that are settled within the scientific community , such as human responsibility for global warming , remain the subject of politically or economically motivated attempts to downplay , dismiss or deny them -- an ideological phenomenon categorised by academics and scientists as climate change denial . The sources of funding for those involved with climate science -- both supporting and opposing mainstream scientific positions -- have been questioned by both sides . There are debates about the best policy responses to the science , their cost-effectiveness and their urgency . Climate scientists , especially in the United States , have reported official and oil-industry pressure to censor or suppress their work and hide scientific data , with directives not to discuss the subject in public communications . Legal cases regarding global warming , its effects , and measures to reduce it have reached American courts . The fossil fuels lobby has been identified as overtly or covertly supporting efforts to undermine or discredit the scientific consensus on global warming .
1932	Global_cooling	Newspaper Article from 1922 Discusses Arctic Ocean Climate Change	Global cooling Global cooling was a conjecture during the 1970s of imminent cooling of the Earth 's surface and atmosphere culminating in a period of extensive glaciation . This hypothesis had little support in the scientific community , but gained temporary popular attention due to a combination of a slight downward trend of temperatures from the 1940s to the early 1970s and press reports that did not accurately reflect the full scope of the scientific climate literature , which showed a larger and faster-growing body of literature projecting future warming due to greenhouse gas emissions . The current scientific opinion on climate change is that the Earth has not durably cooled , but underwent global warming throughout the 20th century .
377	Carbon_dioxide	If we halve the carbon dioxide content of the atmosphere, all life dies.	Carbon dioxide Carbon dioxide ( chemical formula ) is a colorless gas with a density about 60 % higher than that of air ( 1.225 g/L ) that is odorless at normally encountered concentrations . Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms . It occurs naturally in Earth 's atmosphere as a trace gas at a concentration of about 0.04 percent ( 400 ppm ) by volume . Natural sources include volcanoes , hot springs and geysers , and it is freed from carbonate rocks by dissolution in water and acids . Because carbon dioxide is soluble in water , it occurs naturally in groundwater , rivers and lakes , ice caps , glaciers and seawater . It is present in deposits of petroleum and natural gas . As the source of available carbon in the carbon cycle , atmospheric carbon dioxide is the primary carbon source for life on Earth and its concentration in Earth 's pre-industrial atmosphere since late in the Precambrian has been regulated by photosynthetic organisms and geological phenomena . Plants , algae and cyanobacteria use light energy to photosynthesize carbohydrate from carbon dioxide and water , with oxygen produced as a waste product . Carbon dioxide is produced by all aerobic organisms when they metabolize carbohydrates and lipids to produce energy by respiration . It is returned to water via the gills of fish and to the air via the lungs of air-breathing land animals , including humans . Carbon dioxide is produced during the processes of decay of organic materials and the fermentation of sugars in bread , beer and winemaking . It is produced by combustion of wood and other organic materials and fossil fuels such as coal , peat , petroleum and natural gas . It is a versatile industrial material , used , for example , as an inert gas in welding and fire extinguishers , as a pressurizing gas in air guns and oil recovery , as a chemical feedstock and in liquid form as a solvent in decaffeination of coffee and supercritical drying . It is added to drinking water and carbonated beverages including beer and sparkling wine to add effervescence . The frozen solid form of , known as `` dry ice '' is used as a refrigerant and as an abrasive in dry-ice blasting . Carbon dioxide is the most significant long-lived greenhouse gas in Earth 's atmosphere . Since the Industrial Revolution anthropogenic emissions - primarily from use of fossil fuels and deforestation - have rapidly increased its concentration in the atmosphere , leading to global warming . Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid .
118	Scientific_consensus_on_climate_change	more than 100 per cent of the warming over the past century is due to human actions	Scientific consensus on climate change There is currently a strong scientific consensus that the Earth is warming and that this warming is mainly caused by human activities. This consensus is supported by various studies of scientists' opinions and by position statements of scientific organizations, many of which explicitly agree with the Intergovernmental Panel on Climate Change (IPCC) synthesis reports. Nearly all actively publishing climate scientists (97–98%) support the consensus on anthropogenic climate change, and the remaining 2% of contrarian studies either cannot be replicated or contain errors.
2260	Scientific_consensus_on_climate_change	The current debate on the connection between CO2 emissions and climate change has largely overlooked an independent and equally serious problem, the increasing acidity of our oceans.	Scientific consensus on climate change There is currently a strong scientific consensus that the Earth is warming and that this warming is mainly caused by human activities. This consensus is supported by various studies of scientists' opinions and by position statements of scientific organizations, many of which explicitly agree with the Intergovernmental Panel on Climate Change (IPCC) synthesis reports. Nearly all actively publishing climate scientists (97–98%) support the consensus on anthropogenic climate change, and the remaining 2% of contrarian studies either cannot be replicated or contain errors.
148	Tipping_points_in_the_climate_system	Previous IPCC reports tended to assume that clouds would have a neutral impact because the warming and cooling feedbacks would cancel each other out.	Tipping points in the climate system A tipping point in the climate system is a threshold that, when exceeded, can lead to large changes in the state of the system. Potential tipping points have been identified in the physical climate system, in impacted ecosystems, and sometimes in both. For instance, feedback from the global carbon cycle is a driver for the transition between glacial and interglacial periods, with orbital forcing providing the initial trigger. Earth's geologic temperature record includes many more examples of geologically rapid transitions between different climate states.Climate tipping points are of particular interest in reference to concerns about global warming in the modern era. Possible tipping point behaviour has been identified for the global mean surface temperature by studying self-reinforcing feedbacks and the past behavior of Earth's climate system. Self-reinforcing feedbacks in the carbon cycle and planetary reflectivity could trigger a cascading set of tipping points that lead the world into a hothouse climate state.Large-scale components of the Earth system that may pass a tipping point have been referred to as tipping elements. Tipping elements are found in the Greenland and Antarctic ice sheets, possibly causing tens of meters of sea level rise. These tipping points are not always abrupt. For example, at some level of temperature rise the melt of a large part of the Greenland ice sheet and/or West Antarctic Ice Sheet will become inevitable; but the ice sheet itself may persist for many centuries. Some tipping elements, like the collapse of ecosystems, are irreversible.
2633	Jupiter	Jupiter's climate change is due to shifts in internal turbulence fueled from an internal heat source - the planet radiates twice as much energy as it receives from the sun.	Jupiter Jupiter is the fifth planet from the Sun and the largest in the Solar System . It is a giant planet with a mass one-thousandth that of the Sun , but two and a half times that of all the other planets in the Solar System combined . Jupiter and Saturn are gas giants ; the other two giant planets , Uranus and Neptune are ice giants . Jupiter has been known to astronomers since antiquity . The Romans named it after their god Jupiter . When viewed from Earth , Jupiter can reach an apparent magnitude of − 2.94 , bright enough for its reflected light to cast shadows , and making it on average the third-brightest object in the night sky after the Moon and Venus . Jupiter is primarily composed of hydrogen with a quarter of its mass being helium , though helium comprises only about a tenth of the number of molecules . It may also have a rocky core of heavier elements , but like the other giant planets , Jupiter lacks a well-defined solid surface . Because of its rapid rotation , the planet 's shape is that of an oblate spheroid ( it has a slight but noticeable bulge around the equator ) . The outer atmosphere is visibly segregated into several bands at different latitudes , resulting in turbulence and storms along their interacting boundaries . A prominent result is the Great Red Spot , a giant storm that is known to have existed since at least the 17th century when it was first seen by telescope . Surrounding Jupiter is a faint planetary ring system and a powerful magnetosphere . Jupiter has at least 67 moons , including the four large Galilean moons discovered by Galileo Galilei in 1610 . Ganymede , the largest of these , has a diameter greater than that of the planet Mercury . Jupiter has been explored on several occasions by robotic spacecraft , most notably during the early Pioneer and Voyager flyby missions and later by the Galileo orbiter . In late February 2007 , Jupiter was visited by the New Horizons probe , which used Jupiter 's gravity to increase its speed and bend its trajectory en route to Pluto . The latest probe to visit the planet is Juno , which entered into orbit around Jupiter on July 4 , 2016 . Future targets for exploration in the Jupiter system include the probable ice-covered liquid ocean of its moon Europa .
1455	Retreat_of_glaciers_since_1850	The Greenland and Antarctic ice sheets have decreased in mass.	Retreat of glaciers since 1850 The retreat of glaciers since 1850 affects the availability of fresh water for irrigation and domestic use , mountain recreation , animals and plants that depend on glacier-melt , and , in the longer term , the level of the oceans . Studied by glaciologists , the temporal coincidence of glacier retreat with the measured increase of atmospheric greenhouse gases is often cited as an evidentiary underpinning of global warming . Mid-latitude mountain ranges such as the Himalayas , Alps , Rocky Mountains , Cascade Range , and the southern Andes , as well as isolated tropical summits such as Mount Kilimanjaro in Africa , are showing some of the largest proportionate glacial losses . Glacier mass balance is the key determinant of the health of a glacier . If the amount of frozen precipitation in the accumulation zone exceeds the quantity of glacial ice lost due to melting or in the ablation zone a glacier will advance ; if the accumulation is less than the ablation , the glacier will retreat . Glaciers in retreat will have negative mass balances , and if they do not find an equilibrium between accumulation and ablation , will eventually disappear . The Little Ice Age was a period from about 1550 to 1850 when the world experienced relatively cooler temperatures compared to the present . Subsequently , until about 1940 , glaciers around the world retreated as the climate warmed substantially . Glacial retreat slowed and even reversed temporarily , in many cases , between 1950 and 1980 as global temperatures cooled slightly . Since 1980 , a significant global warming has led to glacier retreat becoming increasingly rapid and ubiquitous , so much so that some glaciers have disappeared altogether , and the existences of many of the remaining glaciers are threatened . In locations such as the Andes of South America and Himalayas in Asia , the demise of glaciers in these regions has the potential to affect water supplies in those areas . The retreat of mountain glaciers , notably in western North America , Asia , the Alps and tropical and subtropical regions of South America , Africa and Indonesia , provide evidence for the rise in global temperatures since the late 19th century . The acceleration of the rate of retreat since 1995 of key outlet glaciers of the Greenland and West Antarctic ice sheets may foreshadow a rise in sea level , which would affect coastal regions .
2991	United_Kingdom	Yet the cost of doing something will likely be higher than 6 per cent of GDP" (Bjorn Lomborg)	United Kingdom The United Kingdom of Great Britain and Northern Ireland , commonly known as the United Kingdom ( UK ) or Britain , is a sovereign country in western Europe . Lying off the north-western coast of the European mainland , the United Kingdom includes the island of Great Britain , the north-eastern part of the island of Ireland and many smaller islands . Northern Ireland is the only part of the United Kingdom that shares a land border with another sovereign statethe Republic of Ireland.Although Northern Ireland is the only part of the UK that shares a land border with another sovereign state , two of its Overseas Territories also share land borders with other sovereign countries . Gibraltar shares a border with Spain , while the Sovereign Base Areas of Akrotiri and Dhekelia share borders with the Republic of Cyprus , the Turkish Republic of Northern Cyprus and the UN buffer zone separating the two Cypriot polities . Apart from this land border , the United Kingdom is surrounded by the Atlantic Ocean , with the North Sea to its east , the English Channel to its south and the Celtic Sea to its south-south-west , giving it the 12th-longest coastline in the world . The Irish Sea lies between Great Britain and Ireland . With an area of 242500 km2 , the United Kingdom is the 78th-largest sovereign state in the world and the 11th-largest in Europe . It is also the 21st-most populous country , with an estimated 65.1 million inhabitants . Together , this makes it the fourth-most densely populated country in the European Union ( EU ) . The United Kingdom is a constitutional monarchy with a parliamentary system of governance . The monarch is Queen Elizabeth II , who has reigned since 6 February 1952 . The capital of the United Kingdom and its largest city is London , a global city and financial centre with an urban area population of 10.3 million , the fourth-largest in Europe and second-largest in the European Union . Other major urban areas in the United Kingdom include the conurbations centred on Birmingham , Leeds , Glasgow , Liverpool and Manchester . The United Kingdom consists of four countries -- England , Scotland , Wales and Northern Ireland . The last three have devolved administrations , each with varying powers , based in their capitals , Edinburgh , Cardiff and Belfast , respectively . The nearby Isle of Man , Bailiwick of Guernsey and Bailiwick of Jersey are not part of the United Kingdom , being Crown dependencies with the British Government responsible for defence and international representation . The relationships among the countries of the UK have changed over time . Wales was annexed by the Kingdom of England under the Laws in Wales Acts 1535 and 1542 . A treaty between England and Scotland resulted in 1707 in a unified Kingdom of Great Britain , which merged in 1801 with the Kingdom of Ireland to form the United Kingdom of Great Britain and Ireland . Five-sixths of Ireland seceded from the UK in 1922 , leaving the present formulation of the United Kingdom of Great Britain and Northern Ireland.The Anglo-Irish Treaty was signed on 6 December 1921 to resolve the Irish War of Independence . When it took effect one year later , it established the Irish Free State as a separate dominion within the Commonwealth . The UK 's current name was adopted to reflect the change . There are fourteen British Overseas Territories . These are the remnants of the British Empire which , at its height in the 1920s , encompassed almost a quarter of the world 's land mass and was the largest empire in history . British influence can be observed in the language , culture and legal systems of many of its former colonies . The United Kingdom is a developed country and has the world 's fifth-largest economy by nominal GDP and ninth-largest economy by purchasing power parity . The UK is considered to have a high-income economy and is categorised as very high in the Human Development Index , ranking 16th in the world . It was the world 's first industrialised country and the world 's foremost power during the 19th and early 20th centuries . The UK remains a great power with considerable economic , cultural , military , scientific and political influence internationally . It is a recognised nuclear weapons state and is seventh in military expenditure in the world . The UK has been a permanent member of the United Nations Security Council since its first session in 1946 . It has been a leading member state of the EU and its predecessor , the European Economic Community ( EEC ) , since 1973 . However , on 23 June 2016 , a national referendum on the UK 's membership of the EU resulted in a decision to leave , and its exit from the EU is currently being negotiated . The UK is also a member of the Commonwealth of Nations , the Council of Europe , the G7 finance ministers , the G7 forum , the G20 , NATO , the Organisation for Economic Co-operation and Development ( OECD ) , and the World Trade Organization ( WTO ) .
1850	Carbon_tax	Australian households will benefit to the tune of $550 a year if the carbon tax is axed.	Carbon tax A carbon tax is a tax levied on the carbon content of fuels . It is a form of carbon pricing . Carbon is present in every hydrocarbon fuel ( coal , petroleum , and natural gas ) and converted to carbon dioxide and other products when combusted . In contrast , non-combustion energy sources -- wind , sunlight , geothermal , hydropower , and nuclear -- do not convert hydrocarbons to . is a heat-trapping `` greenhouse '' gas which represents a negative externality on the climate system ( see scientific opinion on global warming ) . Since GHG emissions caused by the combustion of fossil fuels are closely related to the carbon content of the respective fuels , a tax on these emissions can be levied by taxing the carbon content of fossil fuels at any point in the product cycle of the fuel . Carbon tax offers social and economic benefits . It is a tax that increases revenue without significantly altering the economy while simultaneously promoting objectives of climate change policy . The objective of a carbon tax is to reduce the harmful and unfavorable levels of carbon dioxide emissions , thereby decelerating climate change and its negative effects on the environment and human health . Carbon taxes offer a potentially cost-effective means of reducing greenhouse gas emissions . From an economic perspective , carbon taxes are a type of Pigovian tax . They help to address the problem of emitters of greenhouse gases not facing the full social cost of their actions . Carbon taxes can be a regressive tax , in that they may directly or indirectly affect low-income groups disproportionately . The regressive impact of carbon taxes could be addressed by using tax revenues to favour low-income groups . A number of countries have implemented carbon taxes or energy taxes that are related to carbon content . Most environmentally related taxes with implications for greenhouse gas emissions in OECD countries are levied on energy products and motor vehicles , rather than on emissions directly . Opposition to increased environmental regulation such as carbon taxes often centers on concerns that firms might relocate and/or people might lose their jobs . It has been argued , however , that carbon taxes are more efficient than direct regulation and may even lead to higher employment ( see footnotes ) . Many large users of carbon resources in electricity generation , such as the United States , Russia , and China , are resisting carbon taxation .
2144	Intergovernmental_Panel_on_Climate_Change	97% consensus on human-caused global warming has been disproven	Intergovernmental Panel on Climate Change The Intergovernmental Panel on Climate Change ( IPCC ) is a scientific and intergovernmental body under the auspices of the United Nations , set up at the request of member governments , dedicated to the task of providing the world with an objective , scientific view of climate change and its political and economic impacts . It was first established in 1988 by two United Nations organizations , the World Meteorological Organization ( WMO ) and the United Nations Environment Programme ( UNEP ) , and later endorsed by the United Nations General Assembly through Resolution 43/53 . Membership of the IPCC is open to all members of the WMO and UNEP . The IPCC produces reports that support the United Nations Framework Convention on Climate Change ( UNFCCC ) , which is the main international treaty on climate change . The ultimate objective of the UNFCCC is to `` stabilize greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic -LSB- i.e. , human-induced -RSB- interference with the climate system '' . IPCC reports cover `` the scientific , technical and socio-economic information relevant to understanding the scientific basis of risk of human-induced climate change , its potential impacts and options for adaptation and mitigation . '' The IPCC does not carry out its own original research , nor does it do the work of monitoring climate or related phenomena itself . The IPCC bases its assessment on the published literature , which includes peer-reviewed and non-peer-reviewed sources . Thousands of scientists and other experts contribute ( on a voluntary basis , without payment from the IPCC ) to writing and reviewing reports , which are then reviewed by governments . IPCC reports contain a `` Summary for Policymakers '' , which is subject to line-by-line approval by delegates from all participating governments . Typically this involves the governments of more than 120 countries . The IPCC provides an internationally accepted authority on climate change , producing reports which have the agreement of leading climate scientists and the consensus of participating governments . The 2007 Nobel Peace Prize was shared , in equal parts , between the IPCC and Al Gore .
76	Earth	Burping cows are more damaging to the climate than all the cars on this planet.	Earth Earth ( from Eorðe -LSB- Γαῖα , Gaia -RSB- Terra ) , otherwise known as the World or the Globe , is the third planet from the Sun and the only object in the Universe known to harbor life . It is the densest planet in the Solar System and the largest of the four terrestrial planets . According to radiometric dating and other sources of evidence , Earth formed about 4.54 billion years ago . Earth 's gravity interacts with other objects in space , especially the Sun and the Moon , Earth 's only natural satellite . During one orbit around the Sun , Earth rotates about its axis over 365 times ; thus , an Earth year is about 365.26 days long . Earth 's axis of rotation is tilted , producing seasonal variations on the planet 's surface . The gravitational interaction between the Earth and Moon causes ocean tides , stabilizes the Earth 's orientation on its axis , and gradually slows its rotation . Earth 's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years . About 71 % of Earth 's surface is covered with water , mostly by its oceans . The remaining 29 % is land consisting of continents and islands that together have many lakes , rivers and other sources of water that contribute to the hydrosphere . The majority of Earth 's polar regions are covered in ice , including the Antarctic ice sheet and the sea ice of the Arctic ice pack . Earth 's interior remains active with a solid iron inner core , a liquid outer core that generates the Earth 's magnetic field , and a convecting mantle that drives plate tectonics . Within the first billion years of Earth 's history , life appeared in the oceans and began to affect the Earth 's atmosphere and surface , leading to the proliferation of aerobic and anaerobic organisms . Some geological evidence indicates that life may have arisen as much as 4.1 billion years ago . Since then , the combination of Earth 's distance from the Sun , physical properties , and geological history have allowed life to evolve and thrive . In the history of the Earth , biodiversity has gone through long periods of expansion , occasionally punctuated by mass extinction events . Over 99 % of all species that ever lived on Earth are extinct . Estimates of the number of species on Earth today vary widely ; most species have not been described . Over 7.4 billion humans live on Earth and depend on its biosphere and minerals for their survival . Humans have developed diverse societies and cultures ; politically , the world has about 200 sovereign states .
2461	Huaynaputina	Early 20th century warming was in large part due to rising solar activity and relatively quiet volcanic activity.	Huaynaputina Huaynaputina ( -LSB- wainapuˈtina -RSB- , Pronounced : -LSB- waɪnəpʊˈtiːnə -RSB- ; from young volcano , meaning `` Young Volcano '' ) is a stratovolcano in a volcanic upland in southern Peru . The volcano does not have an identifiable mountain profile , but instead is a large volcanic crater . It has produced high-potassium andesite and dacite . On 19 February 1600 , it exploded catastrophically ( Volcanic Explosivity Index -LSB- VEI -RSB- 6 ) , in the largest volcanic explosion in South America in historic times . The eruption continued with a series of events into March . An account of the event was included in Fray Antonio Vázquez de Espinosa 's Compendio y Descripción de las Indias , which was translated into English as Compendium and description of the West Indies in 1942 .
2395	Retreat_of_glaciers_since_1850	While the Greenland interior is in mass balance, the coastlines are losing ice.	Retreat of glaciers since 1850 The retreat of glaciers since 1850 affects the availability of fresh water for irrigation and domestic use , mountain recreation , animals and plants that depend on glacier-melt , and , in the longer term , the level of the oceans . Studied by glaciologists , the temporal coincidence of glacier retreat with the measured increase of atmospheric greenhouse gases is often cited as an evidentiary underpinning of global warming . Mid-latitude mountain ranges such as the Himalayas , Alps , Rocky Mountains , Cascade Range , and the southern Andes , as well as isolated tropical summits such as Mount Kilimanjaro in Africa , are showing some of the largest proportionate glacial losses . Glacier mass balance is the key determinant of the health of a glacier . If the amount of frozen precipitation in the accumulation zone exceeds the quantity of glacial ice lost due to melting or in the ablation zone a glacier will advance ; if the accumulation is less than the ablation , the glacier will retreat . Glaciers in retreat will have negative mass balances , and if they do not find an equilibrium between accumulation and ablation , will eventually disappear . The Little Ice Age was a period from about 1550 to 1850 when the world experienced relatively cooler temperatures compared to the present . Subsequently , until about 1940 , glaciers around the world retreated as the climate warmed substantially . Glacial retreat slowed and even reversed temporarily , in many cases , between 1950 and 1980 as global temperatures cooled slightly . Since 1980 , a significant global warming has led to glacier retreat becoming increasingly rapid and ubiquitous , so much so that some glaciers have disappeared altogether , and the existences of many of the remaining glaciers are threatened . In locations such as the Andes of South America and Himalayas in Asia , the demise of glaciers in these regions has the potential to affect water supplies in those areas . The retreat of mountain glaciers , notably in western North America , Asia , the Alps and tropical and subtropical regions of South America , Africa and Indonesia , provide evidence for the rise in global temperatures since the late 19th century . The acceleration of the rate of retreat since 1995 of key outlet glaciers of the Greenland and West Antarctic ice sheets may foreshadow a rise in sea level , which would affect coastal regions .
1425	Extinction	Each year sees the disappearance of thousands of plant and animal species which we will never know, which our children will never see, because they have been lost for ever.	Extinction In biology and ecology , extinction is the end of an organism or of a group of organisms ( taxon ) , normally a species . The moment of extinction is generally considered to be the death of the last individual of the species , although the capacity to breed and recover may have been lost before this point . Because a species ' potential range may be very large , determining this moment is difficult , and is usually done retrospectively . This difficulty leads to phenomena such as Lazarus taxa , where a species presumed extinct abruptly `` reappears '' ( typically in the fossil record ) after a period of apparent absence . More than 99 percent of all species , amounting to over five billion species , that ever lived on Earth are estimated to be extinct . Estimates on the number of Earth 's current species range from 10 million to 14 million , of which about 1.2 million have been documented and over 86 percent have not yet been described . More recently , in May 2016 , scientists reported that 1 trillion species are estimated to be on Earth currently with only one-thousandth of one percent described . Through evolution , species arise through the process of speciation -- where new varieties of organisms arise and thrive when they are able to find and exploit an ecological niche -- and species become extinct when they are no longer able to survive in changing conditions or against superior competition . The relationship between animals and their ecological niches has been firmly established . A typical species becomes extinct within 10 million years of its first appearance , although some species , called living fossils , survive with virtually no morphological change for hundreds of millions of years . Mass extinctions are relatively rare events ; however , isolated extinctions are quite common . Only recently have extinctions been recorded and scientists have become alarmed at the current high rate of extinctions . Most species that become extinct are never scientifically documented . Some scientists estimate that up to half of presently existing plant and animal species may become extinct by 2100 . A dagger symbol next to a species name is often used to indicate its extinction .
2335	Infrared	Satellite measurements of infrared spectra over the past 40 years observe less energy escaping to space at the wavelengths associated with CO2.	Infrared Infrared radiation , or simply infrared or IR , is electromagnetic radiation ( EMR ) with longer wavelengths than those of visible light , and is therefore invisible , although it is sometimes loosely called infrared light . It extends from the nominal red edge of the visible spectrum at 700 nanometers ( frequency 430 THz ) , to 1000000 nm ( 300 GHz ) ( although people can see infrared up to at least 1050 nm in experiments ) . Most of the thermal radiation emitted by objects near room temperature is infrared . Like all EMR , IR carries radiant energy , and behaves both like a wave and like its quantum particle , the photon . Infrared was discovered in 1800 by astronomer Sir William Herschel , who discovered a type of invisible radiation in the spectrum lower in energy than red light , by means of its effect on a thermometer . Slightly more than half of the total energy from the Sun was eventually found to arrive on Earth in the form of infrared . The balance between absorbed and emitted infrared radiation has a critical effect on Earth 's climate . Infrared radiation is emitted or absorbed by molecules when they change their rotational-vibrational movements . It excites vibrational modes in a molecule through a change in the dipole moment , making it a useful frequency range for study of these energy states for molecules of the proper symmetry . Infrared spectroscopy examines absorption and transmission of photons in the infrared range . Infrared radiation is used in industrial , scientific , and medical applications . Night-vision devices using active near-infrared illumination allow people or animals to be observed without the observer being detected . Infrared astronomy uses sensor-equipped telescopes to penetrate dusty regions of space such as molecular clouds , detect objects such as planets , and to view highly red-shifted objects from the early days of the universe . Infrared thermal-imaging cameras are used to detect heat loss in insulated systems , to observe changing blood flow in the skin , and to detect overheating of electrical apparatus . Thermal-infrared imaging is used extensively for military and civilian purposes . Military applications include target acquisition , surveillance , night vision , homing , and tracking . Humans at normal body temperature radiate chiefly at wavelengths around 10 μm ( micrometers ) . Non-military uses include thermal efficiency analysis , environmental monitoring , industrial facility inspections , remote temperature sensing , short-ranged wireless communication , spectroscopy , and weather forecasting .
2427	Carbon_dioxide_in_Earth's_atmosphere	By that time CO2 emissions had already risen from the expanded use of coal that had powered the industrial revolution, and emissions only increased slowly from 3.5gigatonnes in 1910 to under 4gigatonnes by the end of the Second World War.	Carbon dioxide in Earth's atmosphere Carbon dioxide is an important trace gas in Earth 's atmosphere . Currently it constitutes about 0.041 % ( equal to 410 parts per million ; ppm ) by volume of the atmosphere . Despite its relatively small concentration is a potent greenhouse gas and plays a vital role in regulating Earth 's surface temperature through radiative forcing and the greenhouse effect . Reconstructions show that concentrations of in the atmosphere have varied , ranging from as high as 7,000 ppm during the Cambrian period about 500 million years ago to as low as 180 ppm during the Quaternary glaciation of the last two million years . Carbon dioxide is an integral part of the carbon cycle , a biogeochemical cycle in which carbon is exchanged between the Earth 's oceans , soil , rocks and the biosphere . Plants and other photoautotrophs use solar energy to produce carbohydrate from atmospheric carbon dioxide and water by photosynthesis . Almost all other organisms depend on carbohydrate derived from photosynthesis as their primary source of energy and carbon compounds . The current episode of global warming is attributed to increasing emissions of and other greenhouse gases into Earth 's atmosphere . The global annual mean concentration of in the atmosphere has increased by more than 40 % since the start of the Industrial Revolution , from 280 ppm , the level it had for the last 10,000 years leading up to the mid-18th century , to 399 ppm as of 2015 . The present concentration is the highest in at least the past 800,000 years and likely the highest in the past 20 million years . The increase has been caused by anthropogenic sources , particularly the burning of fossil fuels and deforestation . The daily average concentration of atmospheric CO2 at Mauna Loa Observatory first exceeded 400 ppm on 10 May 2013 . It is currently rising at a rate of approximately 2 ppm/year and accelerating . An estimated 30 -- 40 % of the released by humans into the atmosphere dissolves into oceans , rivers and lakes , which contributes to ocean acidification .
388	Earth	We have also been told the problem is DEFINITELY NOT a billions-year-old planet running through cycles where the temperature might fluctuate a bit.	Earth Earth ( from Eorðe -LSB- Γαῖα , Gaia -RSB- Terra ) , otherwise known as the World or the Globe , is the third planet from the Sun and the only object in the Universe known to harbor life . It is the densest planet in the Solar System and the largest of the four terrestrial planets . According to radiometric dating and other sources of evidence , Earth formed about 4.54 billion years ago . Earth 's gravity interacts with other objects in space , especially the Sun and the Moon , Earth 's only natural satellite . During one orbit around the Sun , Earth rotates about its axis over 365 times ; thus , an Earth year is about 365.26 days long . Earth 's axis of rotation is tilted , producing seasonal variations on the planet 's surface . The gravitational interaction between the Earth and Moon causes ocean tides , stabilizes the Earth 's orientation on its axis , and gradually slows its rotation . Earth 's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years . About 71 % of Earth 's surface is covered with water , mostly by its oceans . The remaining 29 % is land consisting of continents and islands that together have many lakes , rivers and other sources of water that contribute to the hydrosphere . The majority of Earth 's polar regions are covered in ice , including the Antarctic ice sheet and the sea ice of the Arctic ice pack . Earth 's interior remains active with a solid iron inner core , a liquid outer core that generates the Earth 's magnetic field , and a convecting mantle that drives plate tectonics . Within the first billion years of Earth 's history , life appeared in the oceans and began to affect the Earth 's atmosphere and surface , leading to the proliferation of aerobic and anaerobic organisms . Some geological evidence indicates that life may have arisen as much as 4.1 billion years ago . Since then , the combination of Earth 's distance from the Sun , physical properties , and geological history have allowed life to evolve and thrive . In the history of the Earth , biodiversity has gone through long periods of expansion , occasionally punctuated by mass extinction events . Over 99 % of all species that ever lived on Earth are extinct . Estimates of the number of species on Earth today vary widely ; most species have not been described . Over 7.4 billion humans live on Earth and depend on its biosphere and minerals for their survival . Humans have developed diverse societies and cultures ; politically , the world has about 200 sovereign states .
1435	Deforestation	An area of coastal ecosystems larger than New York City is destroyed every year, removing an important buffer from extreme weather for coastal communities and releasing carbon dioxide into the atmosphere.	Deforestation Deforestation , clearance or clearing is the removal of a forest or stand of trees where the land is thereafter converted to a non-forest use . Examples of deforestation include conversion of forestland to farms , ranches , or urban use . The most concentrated deforestation occurs in tropical rainforests . About 30 % of Earth 's land surface is covered by forests . Deforestation occurs for multiple reasons : trees are cut down to be used for building or sold as fuel , ( sometimes in the form of charcoal or timber ) , while cleared land is used as pasture for livestock and plantation . The removal of trees without sufficient reforestation has resulted in damage to habitat , biodiversity loss and aridity . It has adverse impacts on biosequestration of atmospheric carbon dioxide . Deforestation has also been used in war to deprive the enemy of vital resources and cover for its forces . Modern examples of this were the use of Agent Orange by the British military in Malaya during the Malayan Emergency and the United States military in Vietnam during the Vietnam War . As of 2005 , net deforestation rates have ceased to increase in countries with a per capita GDP of at least US$ 4,600 . Deforested regions typically incur significant adverse soil erosion and frequently degrade into wasteland . Disregard of ascribed value , lax forest management and deficient environmental laws are some of the factors that allow deforestation to occur on a large scale . In many countries , deforestation , both naturally occurring and human-induced , is an ongoing issue . Deforestation causes extinction , changes to climatic conditions , desertification , and displacement of populations as observed by current conditions and in the past through the fossil record . More than half of all plant and land animal species in the world live in tropical forests . Between 2000 and 2012 , 2.3 e6sqkm of forests around the world were cut down . As a result of deforestation , only 6.2 e6km2 remain of the original 16 e6km2 of forest that formerly covered the Earth .
1406	James_Hansen	Yet, according to NASA, only one temperature sensing station is necessary for the two cities and the vast area between them to be adequately represented in their network."	James Hansen James Edward Hansen ( born 29 March 1941 ) is an American adjunct professor in the Department of Earth and Environmental Sciences at Columbia University . He is best known for his research in climatology , his 1988 Congressional testimony on climate change that helped raise broad awareness of global warming , and his advocacy of action to avoid dangerous climate change . In recent years he has become a climate activist to mitigate the effects of climate change , on a few occasions leading to his arrest . In 2000 , Hansen advanced an alternative view of global warming over the last 100 years , arguing that during that time frame the negative forcing via aerosols and the positive forcing via largely balanced each other out , and that the 0.74 ± 0.18 ° C net rise in average global temperatures could mostly be explained by greenhouse gases other than carbon dioxide , such as methane and chlorofluorocarbons . However , even then he wrote `` the future balance of forcings is likely to shift toward dominance of CO2 over aerosols ''
310	Earth	[data] show only slight warming, mostly at night and in winter	Earth Earth ( from Eorðe -LSB- Γαῖα , Gaia -RSB- Terra ) , otherwise known as the World or the Globe , is the third planet from the Sun and the only object in the Universe known to harbor life . It is the densest planet in the Solar System and the largest of the four terrestrial planets . According to radiometric dating and other sources of evidence , Earth formed about 4.54 billion years ago . Earth 's gravity interacts with other objects in space , especially the Sun and the Moon , Earth 's only natural satellite . During one orbit around the Sun , Earth rotates about its axis over 365 times ; thus , an Earth year is about 365.26 days long . Earth 's axis of rotation is tilted , producing seasonal variations on the planet 's surface . The gravitational interaction between the Earth and Moon causes ocean tides , stabilizes the Earth 's orientation on its axis , and gradually slows its rotation . Earth 's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years . About 71 % of Earth 's surface is covered with water , mostly by its oceans . The remaining 29 % is land consisting of continents and islands that together have many lakes , rivers and other sources of water that contribute to the hydrosphere . The majority of Earth 's polar regions are covered in ice , including the Antarctic ice sheet and the sea ice of the Arctic ice pack . Earth 's interior remains active with a solid iron inner core , a liquid outer core that generates the Earth 's magnetic field , and a convecting mantle that drives plate tectonics . Within the first billion years of Earth 's history , life appeared in the oceans and began to affect the Earth 's atmosphere and surface , leading to the proliferation of aerobic and anaerobic organisms . Some geological evidence indicates that life may have arisen as much as 4.1 billion years ago . Since then , the combination of Earth 's distance from the Sun , physical properties , and geological history have allowed life to evolve and thrive . In the history of the Earth , biodiversity has gone through long periods of expansion , occasionally punctuated by mass extinction events . Over 99 % of all species that ever lived on Earth are extinct . Estimates of the number of species on Earth today vary widely ; most species have not been described . Over 7.4 billion humans live on Earth and depend on its biosphere and minerals for their survival . Humans have developed diverse societies and cultures ; politically , the world has about 200 sovereign states .
910	Economy_of_Venezuela	The cement, iron and steel, and petroleum refining industries could see their production cut by 21% 19%, and 11% respectively."	Economy of Venezuela The economy of Venezuela is largely based on the petroleum sector and manufacturing . Revenue from petroleum exports accounts for more than 50 % of the country 's GDP and roughly 95 % of total exports . Venezuela is the sixth largest member of OPEC by oil production . From the 1950s to the early 1980s the Venezuelan economy experienced a steady growth that attracted many immigrants , with the nation enjoying the highest standard of living in Latin America . During the collapse of oil prices in the 1980s the economy contracted , the monetary sign commenced a progressive devaluation , and inflation skyrocketed to reach peaks of 84 % in 1989 and 99 % in 1996 , three years prior to Hugo Chávez taking office . Venezuela manufactures and exports heavy industry products such as steel , aluminium and cement , with production concentrated around Ciudad Guayana , near the Guri Dam , one of the largest in the world and the provider of about three-quarters of Venezuela 's electricity . Other notable manufacturing includes electronics and automobiles , as well as beverages , and foodstuffs . Agriculture in Venezuela accounts for approximately 3 % of GDP , 10 % of the labor force , and at least one-fourth of Venezuela 's land area . Venezuela exports rice , corn , fish , tropical fruit , coffee , pork , and beef . The country is not self-sufficient in most areas of agriculture . In spite of strained relations between the two countries , the United States has been Venezuela 's most important trading partner . U.S. exports to Venezuela have included machinery , agricultural products , medical instruments , and cars . Venezuela is one of the top four suppliers of foreign oil to the United States . About 500 U.S. companies are represented in Venezuela . According to Central Bank of Venezuela , the government received from 1998 to 2008 around 325 billion USD through oil production and export in general , and according to the International Energy Agency , to August 2015 has production of 2.4 million barrels per day , 500,000 of which go to the United States of America . Since Hugo Chávez 's `` socialist revolution '' half-dismantled its PDVSA oil giant corporation in 2002 by firing most of its 20,000-strong dissident professional human capital , and imposed stringent currency controls in 2003 in an attempt to prevent capital flight , there has been a steady decline in oil production and exports and a series of stern currency devaluations , disrupting the economy . Further yet , price controls , expropriation of numerous farmlands and various industries , among other disputable government policies including a near-total freeze on any access to foreign currency at reasonable `` official '' exchange rates , have resulted in severe shortages in Venezuela and steep price rises of all common goods , including food , water , household products , spare parts , tools and medical supplies ; forcing many manufacturers to either cut production or close down , with many ultimately abandoning the country , as has been the case with several technological firms and most automobile makers . In 2015 , Venezuela had over 100 % inflation -- the highest in the world and the highest in the country 's history at that time . The rate increased to nearly 500 % by the end of 2016 with Venezuela spiraling into hyperinflation while the population poverty rate was between 76 % to 80 % according to independent sources .
2359	Greenhouse_gas	Therefore human emissions upset the natural balance, rising CO2 to levels not seen in at least 800,000 years.	Greenhouse gas A greenhouse gas ( abbrev . GHG ) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range . This process is the fundamental cause of the greenhouse effect . The primary greenhouse gases in Earth 's atmosphere are water vapor , carbon dioxide , methane , nitrous oxide , and ozone . Without greenhouse gases , the average temperature of Earth 's surface would be about -18 ° C , rather than the present average of 15 ° C . In the Solar System , the atmospheres of Venus , Mars and Titan also contain gases that cause a greenhouse effect . Human activities since the beginning of the Industrial Revolution ( taken as the year 1750 ) have produced a 40 % increase in the atmospheric concentration of carbon dioxide , from 280 ppm in 1750 to 406 ppm in early 2017 . This increase has occurred despite the uptake of a large portion of the emissions by various natural `` sinks '' involved in the carbon cycle . Anthropogenic carbon dioxide emissions ( i.e. , emissions produced by human activities ) come from combustion of fossil fuels , principally coal , oil , and natural gas , along with deforestation , soil erosion and animal agriculture . It has been estimated that if greenhouse gas emissions continue at the present rate , Earth 's surface temperature could exceed historical values as early as 2047 , with potentially harmful effects on ecosystems , biodiversity and the livelihoods of people worldwide . Recent estimates suggest that on the current emissions trajectory the Earth could pass a threshold of 2 ° C global warming , which the United Nations ' IPCC designated as the upper limit to avoid `` dangerous '' global warming , by 2036 .
1647	Weather	Extreme weather events are being made more frequent and worse by global warming.	Weather Weather is the state of the atmosphere , to the degree that it is hot or cold , wet or dry , calm or stormy , clear or cloudy . Most weather phenomena occur in the lowest level of the atmosphere , the troposphere , just below the stratosphere . Weather refers to day-to-day temperature and precipitation activity , whereas climate is the term for the averaging of atmospheric conditions over longer periods of time . When used without qualification , `` weather '' is generally understood to mean the weather of Earth . Weather is driven by air pressure , temperature and moisture differences between one place and another . These differences can occur due to the sun 's angle at any particular spot , which varies with latitude . The strong temperature contrast between polar and tropical air gives rise to the largest scale atmospheric circulations : the Hadley Cell , the Ferrel Cell , the Polar Cell , and the jet stream . Weather systems in the mid-latitudes , such as extratropical cyclones , are caused by instabilities of the jet stream flow . Because the Earth 's axis is tilted relative to its orbital plane , sunlight is incident at different angles at different times of the year . On Earth 's surface , temperatures usually range ± 40 ° C ( − 40 ° F to 100 ° F ) annually . Over thousands of years , changes in Earth 's orbit can affect the amount and distribution of solar energy received by the Earth , thus influencing long-term climate and global climate change . Surface temperature differences in turn cause pressure differences . Higher altitudes are cooler than lower altitudes as most atmospheric heating is due to contact with the Earth 's surface while radiative losses to space are mostly constant . Weather forecasting is the application of science and technology to predict the state of the atmosphere for a future time and a given location . The Earth 's weather system is a chaotic system ; as a result , small changes to one part of the system can grow to have large effects on the system as a whole . Human attempts to control the weather have occurred throughout history , and there is evidence that human activities such as agriculture and industry have modified weather patterns . Studying how the weather works on other planets has been helpful in understanding how weather works on Earth . A famous landmark in the Solar System , Jupiter 's Great Red Spot , is an anticyclonic storm known to have existed for at least 300 years . However , weather is not limited to planetary bodies . A star 's corona is constantly being lost to space , creating what is essentially a very thin atmosphere throughout the Solar System . The movement of mass ejected from the Sun is known as the solar wind .
1028	Tincture_(heraldry)	A second coat of paint has much less of an effect, while adding a third or fourth coat has almost no impact at all."	Tincture (heraldry) Tinctures constitute the limited palette of colours and patterns used in heraldry . The use of these tinctures dates back to the formative period of European heraldry , in the twelfth and thirteenth centuries , but the range of tinctures and the manner of depicting and describing them has evolved over time , as new variations and practices have developed . The need to define , depict , and correctly blazon the various tinctures is therefore one of the most important aspects of heraldic art and design .
1170	Effects_of_Hurricane_Katrina_in_New_Orleans	If a major hurricane is approaching with a predicted storm surge of 10-14 feet, are you really going to worry about a sea level rise of 1 inch per decade?"	Effects of Hurricane Katrina in New Orleans As the center of Hurricane Katrina passed southeast of New Orleans on August 29 , 2005 , winds downtown were in the Category 1 range with frequent intense gusts and tidal surge . Hurricane-force winds were experienced throughout the city , although the most severe portion of Katrina missed the city , hitting nearby St. Bernard and Plaquemines parishes . Hurricane Katrina made its final landfall in eastern St. Tammany Parish . The western eye wall passed directly over St. Tammany Parish , Louisiana as a Category 3 hurricane at about 9:45 am CST , August 29 , 2005 . The communities of Slidell , Avery Estates , Lakeshore Estates , Oak Harbor , Eden Isles and Northshore Beach were inundated by the storm surge that extended over six miles inland . The storm surge affected all 57 miles of St. Tammany Parish 's coastline , including Lacombe , Mandeville and Madisonville . The storm surge in the area of the Rigolets Pass was estimated to be 16 feet , not including wave action , declining to 7 ft at Madisonville . The surge had a second peak in eastern St. Tammany as the westerly winds from the southern eye wall pushed the surge to the east , backing up at the bottleneck of the Rigolets Pass . In the City of New Orleans , the storm surge caused approximately 23 breaches in drainage canal and navigational canal levees and floodwalls . The failures of structures are considered by experts to be the worst engineering disaster in the history of the United States . By August 31 , 2005 , 80 % of New Orleans was flooded , with some parts under 15 ft of water . The famous French Quarter and Garden District escaped flooding because those areas are above sea level . Responsibility for the performance of the city 's levees belongs to the United States Army Corps of Engineers . The major breaches included the 17th Street Canal levee , the Industrial Canal levee , and the London Avenue Canal floodwall . These breaches caused the majority of the flooding , according to a June 2007 report by the American Society of Civil Engineers . The flood disaster halted oil production and refining which increased oil prices worldwide . Between 80 and 90 percent of the residents of New Orleans were evacuated before the hurricane struck , testifying to some of the success of the evacuation measures . Despite this , many remained in the city , mainly those who did not have access to personal vehicles or who were isolated from the dissemination of news from the local governments . The Louisiana Superdome was used to house and support some of those who were unable to evacuate . Television shots frequently focused on the Superdome as a symbol of the flooding occurring in New Orleans . The disaster had major implications for a large segment of the population , economy , and politics of the entire United States . It has prompted a Congressional review of the Army Corps of Engineers and the failure of portions of the federally built flood protection system which experts agree should have protected the city 's inhabitants from Katrina 's surge . Katrina has also stimulated significant research in the academic community into urban planning , real estate finance , and economic issues in the wake of a natural disaster .
1718	Global_warming	The actual data show high northern latitudes are warmer today than in 1940.	Global warming Global warming , also referred to as climate change , is the observed century-scale rise in the average temperature of the Earth 's climate system and its related effects . Multiple lines of scientific evidence show that the climate system is warming . Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record which extends back to the mid 19th century , and in paleoclimate proxy records over thousands of years . In 2013 , the Intergovernmental Panel on Climate Change ( IPCC ) Fifth Assessment Report concluded that `` It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century . '' The largest human influence has been emission of greenhouse gases such as carbon dioxide , methane and nitrous oxide . Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to for their lowest emissions scenario and 2.6 to for the highest emissions scenario . These findings have been recognized by the national science academies of the major industrialized nations and are not disputed by any scientific body of national or international standing . Future climate change and associated impacts will differ from region to region around the globe . Anticipated effects include warming global temperature , rising sea levels , changing precipitation , and expansion of deserts in the subtropics . Warming is expected to be greater over land than over the oceans and greatest in the Arctic , with the continuing retreat of glaciers , permafrost and sea ice . Other likely changes include more frequent extreme weather events including heat waves , droughts , heavy rainfall with floods and heavy snowfall ; ocean acidification ; and species extinctions due to shifting temperature regimes . Effects significant to humans include the threat to food security from decreasing crop yields and the abandonment of populated areas due to rising sea levels . Because the climate system has a large `` inertia '' and greenhouse gases will stay in the atmosphere for a long time , many of these effects will not only exist for decades or centuries , but will persist for tens of thousands of years . Possible societal responses to global warming include mitigation by emissions reduction , adaptation to its effects , building systems resilient to its effects , and possible future climate engineering . Most countries are parties to the United Nations Framework Convention on Climate Change ( UNFCCC ) , whose ultimate objective is to prevent dangerous anthropogenic climate change . Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 C-change relative to pre-industrial levels , with efforts made to limit warming to 1.5 C-change . Public reactions to global warming and concern about its effects are also increasing . A global 2015 Pew Research Center report showed a median of 54 % consider it `` a very serious problem '' . There are significant regional differences , with Americans and Chinese ( whose economies are responsible for the greatest annual CO2 emissions ) among the least concerned .
196	Carbon_dioxide_in_Earth's_atmosphere	Without carbon dioxide, all life on Earth would die	Carbon dioxide in Earth's atmosphere Carbon dioxide is an important trace gas in Earth 's atmosphere . Currently it constitutes about 0.041 % ( equal to 410 parts per million ; ppm ) by volume of the atmosphere . Despite its relatively small concentration is a potent greenhouse gas and plays a vital role in regulating Earth 's surface temperature through radiative forcing and the greenhouse effect . Reconstructions show that concentrations of in the atmosphere have varied , ranging from as high as 7,000 ppm during the Cambrian period about 500 million years ago to as low as 180 ppm during the Quaternary glaciation of the last two million years . Carbon dioxide is an integral part of the carbon cycle , a biogeochemical cycle in which carbon is exchanged between the Earth 's oceans , soil , rocks and the biosphere . Plants and other photoautotrophs use solar energy to produce carbohydrate from atmospheric carbon dioxide and water by photosynthesis . Almost all other organisms depend on carbohydrate derived from photosynthesis as their primary source of energy and carbon compounds . The current episode of global warming is attributed to increasing emissions of and other greenhouse gases into Earth 's atmosphere . The global annual mean concentration of in the atmosphere has increased by more than 40 % since the start of the Industrial Revolution , from 280 ppm , the level it had for the last 10,000 years leading up to the mid-18th century , to 399 ppm as of 2015 . The present concentration is the highest in at least the past 800,000 years and likely the highest in the past 20 million years . The increase has been caused by anthropogenic sources , particularly the burning of fossil fuels and deforestation . The daily average concentration of atmospheric CO2 at Mauna Loa Observatory first exceeded 400 ppm on 10 May 2013 . It is currently rising at a rate of approximately 2 ppm/year and accelerating . An estimated 30 -- 40 % of the released by humans into the atmosphere dissolves into oceans , rivers and lakes , which contributes to ocean acidification .
816	Geology	While geologists have studied events in the past similar to what appears to be happening today, scientists are largely unsure of what lies ahead.	Geology Geology ( from the Ancient Greek γῆ , gē , i.e. `` earth '' and - λoγία , - logia , i.e. `` study of , discourse '' ) is an earth science concerned with the solid Earth , the rocks of which it is composed , and the processes by which they change over time . Geology can also refer generally to the study of the solid features of any terrestrial planet ( such as the geology of the Moon or Mars ) . Geology gives insight into the history of the Earth by providing the primary evidence for plate tectonics , the evolutionary history of life , and past climates . Geology is important for mineral and hydrocarbon exploration and exploitation , evaluating water resources , understanding of natural hazards , the remediation of environmental problems , and for providing insights into past climate change . Geology also plays a role in geotechnical engineering and is a major academic discipline .
1180	Sea_level_rise	"It seems self-evident that rising sea levels will reduce land area.	Sea level rise A sea level rise is an increase in the volume of water in the world 's oceans , resulting in an increase in global mean sea level . Sea level rise is usually attributed to global climate change by thermal expansion of the water in the oceans and by melting of Ice sheets and glaciers on land . Melting of floating ice shelves or icebergs at sea raises sea levels only slightly . Sea level rise at specific locations may be more or less than the global average . Local factors might include tectonic effects , subsidence of the land , tides , currents , storms , etc. . Sea level rise is expected to continue for centuries . Because of the slow inertia , long response time for parts of the climate system , it has been estimated that we are already committed to a sea-level rise of approximately 2.3 m for each degree Celsius of temperature rise within the next 2,000 years . IPCC Summary for Policymakers , AR5 , 2014 , indicated that the global mean sea level rise will continue during the 21st century , very likely at a faster rate than observed from 1971 to 2010 . Projected rates and amounts vary . A January 2017 NOAA report suggests a range of GMSL rise of 0.3 -- 2.5 m possible during the 21st century . Sea level rises can considerably influence human populations in coastal and island regions and natural environments like marine ecosystems .
737	Speleothem	The new research showed that [oxygen isotopes in foraminifera] can change	Speleothem Speleothems ( -LSB- pronˈspiːliːəθɛm -RSB- Ancient Greek : `` cave deposit '' ) -- commonly known as a cave formations -- are secondary mineral deposits formed in a cave . Speleothems typically form in limestone or dolostone solutional caves . The term `` speleothem '' as first introduced by Moore ( 1952 ) , is derived from the Greek words spēlaion `` cave '' + théma `` deposit '' . The definition of `` speleothem '' in most publications , specifically excludes secondary mineral deposits in mines , tunnels and on man-made structures . Hill and Forti more concisely defined `` secondary minerals '' which create speleothems in caves as ; A `` secondary '' mineral is one which is derived by a physicochemical reaction from a primary mineral in bedrock or detritus and/or deposited because of a unique set of conditions in a cave ; i.e. , the cave environment has influenced the mineral 's deposition .

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