Arctic sea ice may be at 'tipping point'

Arctic ice melting may have accelerated to a "tipping point" that will produce a vicious cycle of melting and heating, U.S. scientists say.

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<p><a href="http://www.physorg.com/news6558.html">Arctic sea ice may be at 'tipping point'</a></p> <p>Arctic ice melting may have accelerated to a "tipping point" that will produce a vicious cycle of melting and heating, U.S. scientists say. </p>