(CNN)In the last 22 years, one giant glacier in Antarctica has retreated almost three miles. If it fully thaws, sea levels would rise almost 5 feet.

That’s according to researchers at the University of California, Irvine and NASA’s Jet Propulsion Laboratory. After their assessment of the Denman Glacier in East Antarctica, the team of researchers agreed: There’s reason to be concerned.
“East Antarctica has long been thought to be less threatened,” Eric Rignot, who co-authored the team’s study “Geophysical Research Letters,” said in a statement. “But as glaciers such as Denman have come under closer scrutiny by

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