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In this Dec. 16, 2009 file photo, steam and smoke rises from a coal power station in Gelsenkirchen, Germany. Scientists are more confident than ever that pumping carbon dioxide into the air by burning fossil fuels is warming the planet. By how much is something governments and scientists meeting in Stockholm will try to pin down with as much precision as possible Friday Sept. 27, 2013 in a seminal report on global warming. (AP Photo/Martin Meissner, File)

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