A bumpy shift from ice house to greenhouse

The transition from an ice age to an ice-free planet 300 million years ago was highly unstable, marked by dips and rises in carbon dioxide, extreme swings in climate and drastic effects on tropical vegetation, according to a study published in the journal Science Jan. 5.

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<p><a href="http://www.physorg.com/news87143071.html">A bumpy shift from ice house to greenhouse</a></p> <p>The transition from an ice age to an ice-free planet 300 million years ago was highly unstable, marked by dips and rises in carbon dioxide, extreme swings in climate and drastic effects on tropical vegetation, according to a study published in the journal <i>Science</i> Jan. 5.</p>