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Greenland's ice is thinner at the margins

Two new NASA studies show that the central portion of Greenland's ice sheet isn't, on the whole, getting any thinner. However, one of the investigations finds substantial thinning along most margins of the ice sheet—changes that are contributing to rising sea levels.

Scientists at NASA's Wallops Flight Facility in Wallops Island, Va., led both studies, which they report in the July 21 Science.

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