Greenland's ice sheet is melting 6x faster than it was in the 1980s, and the meltwater is directly raising sea levels, according to a new study published in the journal Proceedings of the National Academy of Sciences.
the entire planet. The Greenland ice sheet has existed for 2.4 million years and is 2.1 miles thick at its deepest point. The whole thing weighs about half as much as Earth's whole atmosphere, or 6 quintillion — or 6 with 18 zeros after it — lbs. . If it melted entirely,In the 21st century, scientists use laser measurements of the height of the ice, measurements of the ice sheet's total gravity and satellite photos to gauge changes in ice thickness.
Those numbers make concrete what researchers and inhabitants of Greenland already knew: that the island is changing and its ancient glaciers are receding at an alarming rate. The dramatic uptick in ice loss in the last two decades coincides with a similar surge in atmospheric
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