生物濒临灭绝（Biological extinction）.docVIP

生物濒临灭绝（Biological extinction） - 10 years ago, the United States environmental law lawyer Cathy Siegel and California Joshua tree biodiversity research center Brendan Cummings, trying to find a habitat loss caused by climate change typical species, through the application of the endangered species list, public concern about global warming threat. After several trade-offs, Seagal will eventually select the polar bear. In her view, the polar bear in the public popularity is higher, coupled with its survival and ice inseparable, global warming, sea ice melting is bound to have an impact on it. In addition, Seagal also hopes to achieve the purpose of promoting government initiatives to reduce greenhouse gas emissions. According to Seagal, once the polar bear is listed as an endangered species, the United States government will act in accordance with the relevant provisions of the endangered species act to take measures to protect its core habitat. And because the polar bears habitat is threatened by global warming, the government will be forced to cut back on greenhouse gases. Based on this idea, Seagal applied on February 16, 2005, the day when the Kyoto Protocol came into effect, calling the polar bear an endangered species. The United States Newsweek 9 reported that the worlds existing polar bears 20 thousand to 25 thousand. Polar bears rely mainly on sea ice for hunting seals, according to Steven Armstrup, a polar bear research expert at the Alaska Science Center of the US Geological survey. But as sea ice continues to melt and open waters increase, polar bears are able to live far from sea shores. However, as seals prefer to swim near shallow waters near the coast, the polar bears hunting activity is affected. At present, the survival rate of 1 year old polar bears has dropped from about 60% to 65%, 20 years ago, to about 40%. If the sea ice continues to melt at its current rate, the number of polar bear populations will decrease by 2/3 by the middle of this century