<p>An international consortium of geoscientists has reconstructed atmosphereric levels of CO2 going back 66 million years using proxies in the geoloogical record. Today&#39;s concenteration, 420 parts per million, is higher than it&#39;s ever been in 14 million years.</p>

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William Anderegg , Thure Cerling , Dustin Harper , Gabe Bowen , Columbia University , U Wilkes Center , University Of Utah , Method Of Research , Release Until , Time Thursday , Integration Project , Industrial Revolution When , Wilkes Center ,