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Actor and activist Mark Ruffalo takes questions before the start of the People's Climate March in New York Sunday, Sept. 21, 2014. Thousands of people from across the nation are expected to participate in what's billed as the largest march ever on global warming. (AP Photo/Craig Ruttle) ** FILE **

Actor and activist Mark Ruffalo takes questions before the start of the People's Climate March in New York Sunday, Sept. 21, 2014. Thousands of people from across the nation are expected to participate in what's billed as the largest march ever on global warming. (AP Photo/Craig Ruttle) ** FILE **

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