WARNING SIGNS

Signs in New York‘s Times Square run messages from 350.org during an International Day of Climate Action rally Saturday Oct. 24, 2009 in New York’s Times Square. The rally, organized by 350.org, was one of thousands expected to take place around the world to draw attention to the number 350, representing what some scientists say is the most carbon dioxide in parts per million we can safely have in the atmosphere.

(AP Photo/Tina Fineberg)

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