Tropical glaciers now smallest in 11,700 years

Tropical glaciers, which are especially at risk from climate warming, have melted rapidly in recent decades. The question, scientists say, is how much?

Glaciers in South America's Andes Mountains are melting faster than expected. Photo: Petruss

Researchers studied exposed bedrock at the edges of glaciers in the tropical Andes Mountains of South America.

The results show that the glaciers are smaller now than they have been in at least 11,700 years.

Scientists predicted that tropical glaciers would melt as temperatures warmed in equatorial regions.

Rock samples adjacent to four glaciers in the Andes Mountains show that the glacial retreat has happened far faster than expected, however.

The four glaciers are the Pan de Azucar Glacier in Colombia, Zongo Glacier in Bolivia, Queshque Glacier in Peru and Charquini Norte Glacier in Bolivia. (U.S. National Science Foundation)

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