cfact.org
Mann, Hayhoe try to erase the Medieval warm period
Climate alarmists Michael Mann and Katharine Hayhoe have been caught using dubious, revisionist temperature data in their attempt, as one Climategate email author put it, to “deal a mortal blow” to the extensively documented Medieval Warm Period. Before climate change became a political issue, it was scientifically well-established that a significant global warming event occurred