03/01/2012 11:38 am ET

How NASA Is Tracking Antarctica's Sea Ice

It's no secret that the planet’s glaciers are melting. The Environmental Protection Agency reports that sea levels have risen from 6 to 8 inches in the past 100 years. Some experts estimate that sea levels will rise as much as 20 inches by the year 2100, which could wreck havoc on coastal cities.

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