FILE - In this July 26, 2011 file photo, a Greenlandic Inuit hunter and fisherman steers his boat past a melting iceberg, along a fjord leading away from the edge of the Greenland ice sheet, near Nuuk, Greenland. Nearly 4 out of 5 Americans now think temperatures are rising and that global warming will be a serious problem for the United States if nothing is done about it, a new Associated Press-GfK poll finds. Belief and worry about climate change are inching up among Americans in general, but concern is growing faster among people who don't often trust scientists on the environment. In follow-up interviews, some of those doubters said they believe their own eyes as they've watched thermometers rise, New York City subway tunnels flood, polar ice melt and Midwestern farm fields dry up. (AP Photo/Brennan Linsley, File)
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