text: Geoscience professors Dr. Ole Humlum and Dr. Jan-Erik Solheim have described a simple, empircal harmonic climate model that accurately explains global temperature observations since 1850, without incorporating any forcing from man-made CO2 or aerosols. According to the authors, " What puzzles many is that this model does not have contributions from CO2 and aerosols." " I f we'd had a warming due to CO2, this should appear as a deviation from the simple harmonic model since 1950.There are no signs of any additional heating due to CO2 as the IPCC claims in their reports, thus the assumed CO2 effects in IPCC climate models are exaggerated.The net effect of CO2 is thus so modest that it can not be seen in this data."