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 >>>

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 >>>

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