Bad News For (Polar) Bears

Will polar bears survive in a warmer world?   New evidence says their numbers are likely to dwindle.  As polar bears lose habitat due to global warming, biologists say, they will be forced southward in search of alternative sources of food, where they will increasingly come into competition with grizzly bears.    Polar bears probably evolved very rapidly in response to glacial climates during the ice ages but rapidly on an evolutionary scale is not a realistic timeline for climate change. read more

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