He denies that climate changes naturally, has been warming ever since the end of the last Ice Age, that the climate was considerably warmer during the Medieval Warm Period...and then accuses those who see such natural warming as the Null Hypothesis with being ‘climate change deniers’?
I think the last Ice Age ended because Cro-Magnon Man and Neandethals were driving SUVs. And, we have found evidence of coal fired power plants being used also. (sarcasm)