claim:  As it happens, the writer of that October 2009 e-mail—Kevin Trenberth, a lead author of the warmist bible, the 2007 Intergovernmental Panel on Climate Change (IPCC) report—told Congress two years ago that evidence for manmade warming is "unequivocal.
evidence: It is a major aspect of climate change and has been demonstrated by direct temperature measurements and by measurements of various effects of the warming.