Inuit seal hunter Dines Mikaelsen strokes a dead seal atop a melting iceberg near Ammassalik Island, Greenland in July 2007. Nobel Peace Prize laureate Al Gore said Thursday Dec. 13, 2007, the United States is "principally responsible" for blocking progress at the U.N. climate conference in Bali, and European nations threatened to boycott U.S.-led climate talks next month unless Washington compromises on emissions reductions. Gore urged delegates at the conference to take urgent action to reduce emissions of greenhouse gases blamed for global warming. (AP Photo/John McConnico. AP Photo logo AP Photo 50 months ago

Inuit seal hunter Dines Mikaelsen strokes a dead seal atop a melting iceberg near Ammassalik Island, Greenland in July 2007. Nobel Peace Prize laureate Al Gore said Thursday Dec. 13, 2007, the United States is "principally responsible" for blocking progress at the U.N. climate conference in Bali, and European nations threatened to boycott U.S.-led climate talks next month unless Washington compromises on emissions reductions. Gore urged delegates at the conference to take urgent action to reduce emissions of greenhouse gases blamed for global warming. (AP Photo/John McConnico.