Greenland and Antarctic ice sheet melting, rate unknown

The Greenland and Antarctica ice sheets are melting, but the amounts that will melt and the time it will take are still unknown, according to Richard Alley, Evan Pugh professor of geosciences, Penn State.

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<p><a href="http://www.physorg.com/news154008410.html">Greenland and Antarctic ice sheet melting, rate unknown</a></p> <p>The Greenland and Antarctica ice sheets are melting, but the amounts that will melt and the time it will take are still unknown, according to Richard Alley, Evan Pugh professor of geosciences, Penn State.</p>