climate change is the name used to indicate all sources of pollution caused by human activity.
what name is used to indicate all sources of pollution caused by human activity?
climate change
beijing has a long history of environmental problems. between 2000 and 2009 beijing's urban extent quadrupled, which not only strongly increased the extent of anthropogenic emissions, but also changed the meteorological situation fundamentally, even if emissions of human society are not included. for example, surface albedo, wind speed and humidity near the surface were decreased, whereas ground and near-surface air temperatures, vertical air dilution and ozone levels were increased. because of the combined factors of urbanization and pollution caused by burning of fossil fuel, beijing is often affected by serious environmental problems, which lead to health issues of many inhabitants. in 2013 heavy smog struck beijing and most parts of northern china, impacting a total of 600 million people. after this "pollution shock" air pollution became an important economic and social concern in china. after that the government of beijing announced measures to reduce air pollution, for example by lowering the share of coal from 24% in 2012 to 10% in 2017, while the national government ordered heavily polluting vehicles to be removed from 2015 to 2017 and increased its efforts to transition the energy system to clean sources.
beijing
the emergence of great factories and consumption of immense quantities of coal gave rise to unprecedented air pollution and the large volume of industrial chemical discharges added to the growing load of untreated human waste. chicago and cincinnati were the first two american cities to enact laws ensuring cleaner air in 1881. pollution became a major issue in the united states in the early twentieth century, as progressive reformers took issue with air pollution caused by coal burning, water pollution caused by bad sanitation, and street pollution caused by the 3 million horses who worked in american cities in 1900, generating large quantities of urine and manure. as historian martin melosi notes, the generation that first saw automobiles replacing the horses saw cars as "miracles of cleanliness.". by the 1940s, however, automobile-caused smog was a major issue in los angeles.
pollution