This story was originally published by Mother Jones and is reproduced here as part of the Climate Desk collaboration.

The head of the Environmental Agency Protection disagrees with a well-established scientific fact regarding global warming. On Thursday morning, while speaking to Joe Kernen on CNBC’s Squawk Box, EPA Administrator Scott Pruitt said that carbon dioxide isn’t necessarily a primary contributor to climate change.

Kernen, who once said climate science is like witchcraft, asked Pruitt if he believes that carbon dioxide is the “main control knob” governing global warming.