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In this March 8, 2014 file photo, steam from the Jeffrey Energy Center coal-fired power plant is silhouetted against the setting sun near St. Mary's, Kan. A groundbreaking agreement struck Wednesday, November 12, 2014, by the United States and China puts the world's two worst polluters on a faster track to curbing the heat-trapping gases blamed for global warming. Energized by these new targets set by China and the United States, the world's top climate polluters, U.N. global warming talks resume December 1, 2014 in Peru, with unusual optimism despite evidence that human-generated climate change is already happening and bound to get worse. (Photo by Charlie Riedel/AP Photo)
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