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Glacial Retreat

A researcher collects a sample of bedrock from the Queshque Glacier in the Peruvian Andes Mountains. The samples show tropical glaciers have retreated to their smallest size in more than 11,700 years based on cosmogenic nuclide measurements of recently exposed bedrock, an international team of scientists, led by Boston college researchers, reports in the journal Science.

Andean glaciers have retreated to lowest levels in 11,700 years

The Aletsch glacier in 2009, in Switzerland

Alpine glaciers will lose at least a third of their volume by 2050, whatever happens

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