A real demonstration of co2 warming in a experiment. This is from a webcast from Berkeley. Watch between 51:00 to 57:00 minutes...The experiment gets interesting around 53:00 and the end result is around 57:00. A good 9 degree increase in temperature! UC Berkeley Webcasts | Video and Podcasts: There's now NO question in my mind that co2 causes warming! Red line increass(co2), blue stays the same(no co2).