Study heats up 'snowball Earth' debate

Research by University Professor Richard Peltier of physics reveals that the Earth’s surface 700 million years ago may have been warmer than previously thought.

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<p><a href="http://www.physorg.com/news126275535.html">Study heats up 'snowball Earth' debate</a></p> <p>Research by University Professor Richard Peltier of physics reveals that the Earth’s surface 700 million years ago may have been warmer than previously thought.</p>