A counter point to man's causing global warming...
Richard Lindzen, Alfred Sloane Professor of Atmospheric Science at the Massachussetts Institute of Technology and member of the National Academy of Sciences: "We are quite confident (1) that global mean temperature is about 0.5 °C higher than it was a century ago; (2) that atmospheric levels of CO2 have risen over the past two centuries; and (3) that CO2 is a greenhouse gas whose increase is likely to warm the earth (one of many, the most important being water vapor and clouds). But--and I cannot stress this enough--we are not in a position to confidently attribute past climate change to CO2 or to forecast what the climate will be in the future." [45] "[T]here has been no question whatsoever that CO2 is an infrared absorber (i.e., a greenhouse gas albeit a minor one), and its increase should theoretically contribute to warming. Indeed, if all else were kept equal, the increase in CO2 should have led to somewhat more warming than has been observed." (San Francisco Examiner, July 12, 2006 [46] and in Wall Street Journal, June 26, 2006, Page A14)