Melting of polar ice sheets has added 11mm to global sea levels over the past two decades, according to the most definitive assessment so far. More than 20 polar research teams combined forces to produce estimates of the state of the ice in Greenland and Antarctica in a paper in Science.
The study’s headline conclusion is that the polar ice sheets have overall contributed 11.1mm to sea level rise but with a “give or take” uncertainty of 3.8mm – meaning the contribution could be as little as 7.3mm or as much as 14.9mm.
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