dr. burton richter, a nobel prize-winning physicist, to fact check arguments about climate change. >> itbe destructive. it's still going to have big consequences. >> so the argument that it doesn't matter what we do, we're not going to be able to make a difference. >> i don't understand the point of that. this is a world issue. the question is what is the world going to do about the temperature rise. >> if you look at the temperatures measured in the lower atmosphere, by satellites, or you look at all four analyse of the weather balloon data, 5,000 to 20,000 feet in the atmosphere. the disparity between the average of the 107 united nations computer models, the disparity between the trends predicted by them, average trends, and what is measured by weather balloons and satellite is stunning. >> first of all there's not 107. there are 25 of general circulation models. all this stuff about layers in the atmosphere, and all that, it's a question that we do not fully understand. where is the heat going? the big surprise in the period when the surface temperature stayed relatively constant is