"I think that measuring with precision human activity on the climate is something very challenging to do and there's tremendous disagreement about the degree of impact, so no, I would not agree that [carbon dioxide emissions are] a primary contributor to the global warming that we see."
Scott Pruitt, talking to CNBC. A good thing he's not the head of the Environmental Protection Agency, which - among other things - has responsibility for regulating emissions of greenhouse gases in the US, isn't it? Eh? Ah.
(Thanks to Mark for the link.)