Researchers find origin of 'breathable' atmosphere half a billion years ago

Ohio State University geologists and their colleagues have uncovered evidence of when Earth may have first supported an oxygen-rich atmosphere similar to the one we breathe today.

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<p><a href="http://www.physorg.com/news112885042.html">Researchers find origin of 'breathable' atmosphere half a billion years ago</a></p> <p>Ohio State University geologists and their colleagues have uncovered evidence of when Earth may have first supported an oxygen-rich atmosphere similar to the one we breathe today.</p>