A dead tree stands on a drought-affected property near the outback town of Ivanhoein New South Wales, Australia. The UN climate panel issued its strongest warning yet on Friday that human activities are heating the planet, putting extra pressure on governments to do more. (Photo: Chinadaily/Reuters ) Photo Gallery >>>

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 >>>