A world with this much CO²: lessons from 4 million years ago (13 Feb 2014)

Lunch Hour Lectures - Spring 2014 Dr Chris Brierley, UCL Geography In Spring last year, carbon dioxide concentrations passed 400 parts per million in the atmosphere -- a level not seen since the Pliocene era (3-5 million years ago), and perhaps not even then. We know that the Pliocene was a warm world without glacial cycles, and that the climate of the tropical Pacific was also structurally different. This lecture discussed the causes and implications of this discrepancy. You can also watch this lecture on the UCLLHL YouTube channel at: http://www.youtube.com/watch?v=lft4OHt0-gE