Heimdal Glacier in southern Greenland is seen in a NASA image captured by Langley Research Center's Falcon 20 aircraft October 13, 2015 and released November 24, 2015. NASA's Operation IceBridge North is an airborne survey of polar ice aimed at learning how much snow and ice disappeared over the summer, according to a NASA news release. (Photo by John Sonntag/Reuters/NASA)
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