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FILE - In this Jan. 5, 2012 file photo, man-made snow coats a ski run next to barren ground under a chairlift at Shawnee Peak ski area in Bridgton, Maine. Scientists point to both scant recent snowfall in parts of the country and this month's whopper of a Northeast blizzard as potential global warming signs. It may seem like a contradiction, but the explanation lies in atmospheric physics. (AP Photo/Robert F. Bukaty)

Associated Press
FILE - In this Jan. 5, 2012 file photo, man-made snow coats a ski run next to barren ground under a chairlift at Shawnee Peak ski area in Bridgton, Maine. Scientists point to both scant recent snowfall in parts of the country and this month's whopper of a Northeast blizzard as potential global warming signs. It may seem like a contradiction, but the explanation lies in atmospheric physics. (AP Photo/Robert F. Bukaty)
FILE - In this Jan. 5, 2012 file photo, man-made snow coats a ski run next to barren ground under a chairlift at Shawnee Peak ski area in Bridgton, Maine. Scientists point to both scant recent snowfall in parts of the country and this month's whopper of a Northeast blizzard as potential global warming signs. It may seem like a contradiction, but the explanation lies in atmospheric physics. (AP Photo/Robert F. Bukaty)
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