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Glaciers are melting at unprecedented rates due to global warming, causing additional climate changes.

About a quarter of the globe’s glacial loss from 1851-2010, and approximately two thirds of glacial loss between 1991-2010, is attributable directly to global warming caused by human-produced greenhouse gases. [45] According to the National Snow and Ice Data Center, global warming from human-produced greenhouse gases is a primary cause of the “unprecedented” retreat of glaciers around the world since the early 20th century. [44]

Since 1980, glaciers worldwide have lost nearly 40 feet (12 meters) in average thickness. [110] According to an IPCC report, “glaciers have continued to shrink almost worldwide” over the prior two decades, and there is “high confidence” (about an 8 out of 10 chance) that Northern Hemisphere spring snow continues to decrease. [29] If the glaciers forming the Greenland ice sheet were to melt entirely, global sea levels could increase by up to 20 feet. [168]

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