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The last edge of the Greenland ice sheet that had resisted global warming has become unstable, adding billions of tons of meltwater to rising seas, scientists said.Known as an ice stream, the river takes ice from a vast basin and slowly shifts it to the sea – in the same way that the Amazon River drains water.The ice stream, called Zachariae, is the largest drain from an ice basin that covers a whopping 16 percent of the Greenland ice sheet.From 2003 to 2012, northeastern Greenland disgorged 10 billion tons of ice annually into the ocean, the study found.Greenland is estimated to contribute 0.5 mm to the 3.2 mm annual rise in global sea levels.
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