The 2015 Arctic sea ice summertime minimum is 699,000 square miles below the 1981-2010 average, shown here as a gold line in this visual representation of a NASA analysis of satellite data released September 14, 2015. The 2015 Arctic sea ice minimum extent is the fourth lowest on record since observations from space began, according to NASA. (Photo by Reuters/NASA/Goddard Scientific Visualization Studio)
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