change is driven solely by how much carbon dioxide we emit into the atmosphere. that's a big oversimplification of the real situation. >> tucker: but isn't that the opposite of science? isn't science allowing the data to form your conclusions rather than try to superimpose your conclusions on the data? >> nature has conducted the experiment for us since about 1e has increased by 40% and during that same time, temperatures have warmed by about 2 degrees fahrenheit, and if you look at that data and combine it with what we know about other climatic factors, the result we obtained is that the sensitivity of climate to carbon dioxide is about significantly smaller than