World's oldest rocks show how Earth may have dodged frozen fate of Mars

Carbon dioxide, a greenhouse gas that has become a bane of modern society, may have saved Earth from freezing over early in the planet's history, according to the first detailed laboratory analysis of the world's oldest sedimentary rocks.

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<p><a href="http://www.physorg.com/news89904686.html">World's oldest rocks show how Earth may have dodged frozen fate of Mars</a></p> <p>Carbon dioxide, a greenhouse gas that has become a bane of modern society, may have saved Earth from freezing over early in the planet's history, according to the first detailed laboratory analysis of the world's oldest sedimentary rocks.</p>