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While the world has watched the extent of the Arctic Ocean's icy cap shrink in recent years, the ice has also been attacked from beneath, making the ice cover thinner, weaker and more vulnerable. In the summer of 2012 when Arctic sea ice dipped to a new record low extent, the thinning of the ice was just as dramatic. At the peak of summer melt in 2012 - according to a University of Washington computer model - the total Arctic sea ice volume was only one-third of what it was in 1979. [Source: Global Climate Change - NASA]
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