India's Rajendra Pachauri, chairman of the Intergovernmental Panel on Climate Change, smiles during an interview with The Associated Press in Cancun, Mexico, Tuesday, Nov. 30, 2010. The U.N. sponsored network of climate scientists said world governments must invest more in cutting-edge research to 'get a handle' on how much and how quickly the world will warm in decades to come. (AP Photo/Charles J. Hanley)
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