How Greenland’s ice is melting from both above and below
There were no scientists around circa 11,000 years ago, when the great Laurentide Ice Sheet, which once covered much of present day North America, began to collapse in numerous stages and eventually dwindled into a collection of much smaller ice caps across Alaska and Canada, raising seas by tens of feet in the process. So no one could observe all of the processes that, as the Northern Hemisphere warmed, led to its undoing.
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