en.wikipedia.org/wiki/Polar_bear
The global polar bear population, estimated to be 22,000-25,000 bears, is relatively stable.[98] However, in 2006, the World Conservation Union (IUCN) upgraded the polar bear from a species of Least Concern to a vulnerable species.[99] It cited a “suspected population reduction of >30% within three generations (45 years)”, due primarily to global warming.[1] Other risks to the polar bear include pollution in the form of toxic contaminants, conflicts with shipping, stresses from recreational polar-bear watching, and oil and gas exploration and development.[1] The IUCN also cited a “potential risk of over-harvest” through legal and illegal hunting.[1]
On May 14, 2008 the U.S. Department of the Interior listed the polar bear as a threatened species under the Endangered Species Act, citing the melting of Arctic sea ice as the primary threat to the polar bear.[117] However, the department immediately issued a statement that the listing could not be used to regulate greenhouse gas emissions, saying, “That would be a wholly inappropriate use of the Endangered Species Act. ESA is not the right tool to set U. S. climate policy.”[118] However, some policy analysts believe that despite the government’s stance, the Endangered Species Act can be used to restrict the issuing of federal permits for projects that would threaten the polar bear by increasing greenhouse gas emissions.[117] Environmental groups have pledged to go to court to have the Endangered Species Act interpreted in such a way.[117]
The U.S. Geological Survey predicts two-thirds of the world’s polar bears will disappear by 2050, based on moderate projections for the shrinking of summer sea ice caused by global warming.[46] The bears would disappear from Europe, Asia, and Alaska, and be depleted from the Arctic archipelago of Canada and areas off the northern Greenland coast. By 2080, they would disappear from Greenland entirely and from the northern Canadian coast, leaving only dwindling numbers in the interior Arctic archipelago.[46]
Actually, it says 2/3 of population.