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Page last updated at 01:23 GMT, Thursday, 15 May 2008 02:23 UK
Polar bears (file picture)
The US lists the polar bear as a threatened species but says the decision will not affect climate change policies.

The way super-fast pilot whales hunt their prey has brought comparisons with the fleet-footed cheetah.
A survey concludes that shifts in the Earth's physical and biological systems are driven by global warming.
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