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: IPCC AR5 WG1 Summary for Policymakers 2013, p. 4 : Warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia.