http://www.chronwatch.com/content/contentDisplay.asp?aid=12594
“Global mean temperatures are cyclical with the seasons but also with other normal cycles, as they have been for the entire history of the Earth. Scientific data from ice cores, tree rings and other indicators of global mean temperatures prove this. Human activity has never been the cause of these global temperature swings as the “global warming” advocates claim. If human activity was the cause, where were the SUVs, the power plants and industries in our historical past? They did not exist. If human activity was not the cause of these global temperature swings, what was?”