is being destroyed at a rate unprecedented in human history". The report claims that 68% of the population of the examined species were destroyed in the years 1970 – 2016. Threats In 2006, many species were formally classified as rare or endangered or threatened; moreover, scientists have estimated that millions more species are at risk which have not been formally recognized. About 40 percent of the 40,177 species assessed using the IUCN Red List criteria are now listed as threatened with extinction—a total of 16,119. As of late 2022 9251 species were considered part of the IUCN's critically endangered. The five main drivers to biodiversity loss are : habitat loss, invasive species, overexploitation (extreme hunting and fishing pressure), pollution, and climate change. Invasive species and other disturbances have become more common in forests in the last several decades. These tend to be directly or indirectly connected to climate change and have negative consequences for forest ecosystems. Jared Diamond describes an "Evil Quartet" of habitat destruction, overkill, introduced species and secondary extinctions. Edward O. Wilson prefers the acronym HIPPO, standing for Habitat destruction, Invasive species, Pollution, human over-Population and Over-harvesting. According to the IUCN the main direct threats to conservation fall in 11 categories 1. Residential & commercial development housing & urban areas (urban areas, suburbs, villages, vacation homes, shopping areas, offices, schools, hospitals) commercial & industrial areas (manufacturing plants, shopping centers, office parks, military bases, power plants, train & shipyards, airports) tourism & recreational areas (skiing, golf courses, sports fields, parks, campgrounds) 2. Farming activities agriculture (crop farms, orchards, vineyards, plantations, ranches) aquaculture (shrimp or finfish aquaculture, fish ponds on farms, hatchery salmon, seeded shellfish beds, artificial algal beds) 3. Energy production & mining renewable energy production (geothermal, solar, wind, & tidal farms), including hydroelectric dams non-renewable energy production (oil and gas drilling) mining (fuel and minerals) 4. Transportation & service corridors service corridors (electrical & phone wires, aqueducts, oil & gas pipelines) transport corridors (roads, railroads, shipping lanes, and flight paths) collisions with the vehicles using the corridors associated accidents and catastrophes (oil spills, electrocution, fire) 5. Biological resource usages hunting (bushmeat, trophy, fur) persecution (predator control and pest control, superstitions) plant destruction or removal (human consumption, free-range livestock foraging, battling timber disease, orchid collection) logging or wood harvesting (selective or clear-cutting, firewood collection, charcoal production) fishing (trawling, whaling, live coral or seaweed or egg collection) 6. Human intrusions