The kilometres-thick icesheet that covers Greenland saw a near-record imbalance last year between new snowfall and the discharge of meltwater and ice into the ocean, scientists have reported. A net loss of 600 billion tonnes was enough to raise the global watermark 1.5 millimetres, about 40 percent of total sea level rise in 2019. The Greenland icesheet -- which, until the end of the 20th century accumulated as much mass as it shed -- holds enough frozen water to lift the world's oceans by seven metres.
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