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FILE - In this July 17, 2007 file photo, an iceberg melts in Kulusuk Bay, eastern Greenland. The world's warming oceans are rising at twice the 20th century's average rate, from thermal expansion and the runoff of melting land ice, says the Geneva-based World Climate Research Program. Cancun, Mexico will host the 2010 annual U.N. climate conference amidst doubts about whether the long-running, 194-nation talks can ever agree on a legally binding treaty for reining in global warming. (AP Photo/John McConnico, File)