New evidence puts 'Snowball Earth' theory out in the cold

The theory that Earth once underwent a prolonged time of extreme global freezing has been dealt a blow by new evidence that periods of warmth occurred during this so-called 'Snowball Earth' era.

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<p><a href="http://www.physorg.com/news93869405.html">New evidence puts 'Snowball Earth' theory out in the cold</a></p> <p>The theory that Earth once underwent a prolonged time of extreme global freezing has been dealt a blow by new evidence that periods of warmth occurred during this so-called 'Snowball Earth' era.</p>