FILE - In this July 19, 2007 file photo an iceberg melts 

FILE - In this July 19, 2007 file photo an iceberg melts off Ammassalik Island in Eastern Greenland. Scientists who are fine-tuning a landmark U.N. report on climate change are struggling to explain why global warming appears to have slowed down in the past 15 years even as greenhouse gas emissions keep rising. Leaked documents show there is widespread disagreement among governments over how to address the contentious issue in Sept. 23-26 stock-taking report by the Intergovernmental Panel on Climate Change. (AP Photo/John McConnico, File)
Associated Press
FILE - In this July 19, 2007 file photo an iceberg melts off Ammassalik Island in Eastern Greenland. Scientists who are fine-tuning a landmark U.N. report on climate change are struggling to explain why global warming appears to have slowed down in the past 15 years even as greenhouse gas emissions keep rising. Leaked documents show there is widespread disagreement among governments over how to address the contentious issue in Sept. 23-26 stock-taking report by the Intergovernmental Panel on Climate Change. (AP Photo/John McConnico, File)
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