I have to remember where I saw this but the same so-called scientists that advocate that no climate change is occurring ARE THE SAME that alleged smoking didn't cause cancer.
EDIT: Article detailing that the deniers of climate change are using the sames techniques as the tobacco industry:
http://www.guardian.co.uk/environment/2006/sep/19/ethicalliving.g2
But what I have discovered while researching this issue is that the corporate funding of lobby groups denying that manmade climate change is taking place was initiated not by Exxon, or by any other firm directly involved in the fossil fuel industry. It was started by the tobacco company Philip Morris