Extinction risk to plant biodiversity may occur at lower levels of atmospheric CO2 than previously considered

(PhysOrg.com) -- Scientists have traced a sudden collapse in plant biodiversity in ancient Greenland, some 200 million years ago, to a relatively small rise in atmospheric carbon dioxide which caused a rise in the Earth’s temperature.

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<p><a href="http://www.physorg.com/news165508154.html">Extinction risk to plant biodiversity may occur at lower levels of atmospheric CO2 than previously considered</a></p> <p>(PhysOrg.com) -- Scientists have traced a sudden collapse in plant biodiversity in ancient Greenland, some 200 million years ago, to a relatively small rise in atmospheric carbon dioxide which caused a rise in the Earth’s temperature.</p>