FILE - In this Saturday, Feb. 9, 2013 file photo, Mike Brown of Boston cross country skis past snow-covered cars through the Chinatown neighborhood of Boston. Scientists point to both scant recent snowfall in parts of the country and this month's whopper of a Northeast blizzard as potential signs of global warming. It may seem like a contradiction, but the explanation lies in atmospheric physics. (AP Photo/Charles Krupa)

Associated Press
FILE - In this Saturday, Feb. 9, 2013 file photo, Mike Brown of Boston cross country skis past snow-covered cars through the Chinatown neighborhood of Boston. Scientists point to both scant recent snowfall in parts of the country and this month's whopper of a Northeast blizzard as potential signs of global warming. It may seem like a contradiction, but the explanation lies in atmospheric physics. (AP Photo/Charles Krupa)
FILE - In this Saturday, Feb. 9, 2013 file photo, Mike Brown of Boston cross country skis past snow-covered cars through the Chinatown neighborhood of Boston. Scientists point to both scant recent snowfall in parts of the country and this month's whopper of a Northeast blizzard as potential signs of global warming. It may seem like a contradiction, but the explanation lies in atmospheric physics. (AP Photo/Charles Krupa)
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