By MELINA WALLING

An iconic Argentinian glacier, long thought one of the few on Earth to be relatively stable, is now undergoing its “most substantial retreat in the past century,” according to new research.

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The Perito Moreno Glacier in the Southern Patagonian Ice Field for decades has been wedged securely in a valley. But it’s started losing contact with the bedrock below, causing it to shed more ice as it inches backward. I

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