Northern U.S. lakes losing ice coverage

A University of Wisconsin study reportedly suggests northern U.S. lakes have been losing annual ice cover earlier each year for the past 30 years.

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<p><a href="http://www.physorg.com/news8553.html">Northern U.S. lakes losing ice coverage</a></p> <p>A University of Wisconsin study reportedly suggests northern U.S. lakes have been losing annual ice cover earlier each year for the past 30 years.</p>