text: 7) Is Increasing CO2 Even Capable of Causing Warming? There are some very intelligent people out there who claim that adding more carbon dioxide to the atmosphere cant cause warming anyway. They claim things like, the atmospheric CO2 absorption bands are already saturated, or something else very technical. . While it is true that most of the CO2-caused warming in the atmosphere was there before humans ever started burning coal and driving SUVs, this is all taken into account by computerized climate models that predict global warming. Adding more should cause warming, with the magnitude of that warming being the real question. But Im still open to the possibility that a major error has been made on this fundamental point. Stranger things have happened in science before.