NBC Learn   |  May 03, 2011

Glaciers shrinking at 'alarming' rate

The world's glaciers are shrinking at alarming rates. Lonnie Thompson of Ohio State University and Douglas Hardy of UMass-Amherst discuss glaciers and how they melt, and pay special attention to Africa's tallest mountain, Mt. Kilimanjaro. NBC's Anne Thompson reports for "Changing Planet," produced by NBC Learn in partnership with the National Science Foundation.

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