US accepts threat to polar bears
December 28th, 2006
It is the first time the US has made a direct link between global warming and the threat to a species.
President George Bush has steadfastly refused to back mandatory controls of emissions of carbon dioxide - believed the main gas behind global warming.
There are 20,000 to 25,000 polar bears across the globe, about 4,700 of them in the US state of Alaska.

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