I was poking around SuperTopo where they are currently going over the same thing. One person posted a link to David Archer a faculty member at the University of Chicago. One of the links is a series of video lectures of a class on global warming for non science majors. I haven't seen any of the videos, 56k doesn't quite hack it, but I had a class that used his textbook and was pretty impressed with it. If you have time to kill might want to check them out.
David Archer:
http://geosci.uchicago.edu/people/archer.shtml
Video lectures:
http://geoflop.uchicago.edu/forecast/docs/lectures.html
Oh, damn, forgot to add a little more...No dissent allowed..2012...ManBearPig