Richard Alley: "The Biggest Control Knob: Carbon Dioxide in Earth's Climate History" - YouTube

http://www.youtube.com/watch?v=RffPSrRpq_g&t=42m06s

From the 2009 AGO Fall meeting. Original here: http://www.agu.org/meetings/fm09/lectures/lecture_videos/A23A.shtml http://mind.ofdan.ca/co2-is-and-has-always...