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Scientists identify tipping point for Greenland's ice sheet — and it's not far off

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67% Informative

Greenland's ice sheet is one of only two permanent ice sheets on Earth , the other being the Antarctic ice sheet.

The Greenland and Antarctic ice sheets make up more than 70% of Earth 's freshwater reserves.

Greenland 's melting could trigger a collapse of the world's second -largest ice sheet, causing sea levels to rise by 23 feet .