A polar bear plays on the tundra near Churchill, Manitoba, Canada, Nov. 3, 2006. The United States proposed Wednesday to list polar bears as "threatened" on government list of imperilled species, marking the first time the Bush administration has singled out climate change as the potential driving force behind the demise of a species.(Photo: China Daily) Photo Gallery >>>

The U.N. climate panel issued its toughest warning yet on Friday that human activities are to blame for global warming and projected a damaging, accelerating rise in temperatures in the 21st century, putting extra pressure on governments to do more to combat accelerating global warming. (File Photo) Photo Gallery >>>