CO2

From Thomas Lifson at the American Thinker:
Another nail in the coffin on man-made global warming theory. A study by Wolfgang Knorr of the Department of Earth Sciences at the University of Bristol, published in Geophysical Research Letters, finds that the airborne fraction of carbon dioxide has not increased either during the past 150 years or during the most recent five decades.
Professor Knorr reanalyzed available atmospheric carbon dioxide and emissions data since 1850.So much for "settled science."