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The Last Time Carbon Dioxide Concentrations Were Around 400ppm: A Snapshot From Arctic Siberia

Saturday, May 18, 2013

The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia (via Skeptical Science)

Posted on 14 May 2013 by John Mason Synopsis During the late Pliocene and early Pleistocene Series of the Cenozoic Era, 3.6 to 2.2 Ma (million years ago), the Arctic was much warmer than it is at the present day (with summer temperatures from 3.6-3.4 Ma some 8oC warmer than today). That is a key finding…



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