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U.S. Energy Secretary Rick Perry told CNBC on Monday he does not believe carbon dioxide emissions from human activity are the main driver of climate change, joining the EPA administrator in casting doubt on the conclusion of some of the government’s top scientists.

Asked whether CO2 emissions are primarily responsible for climate change, Perry told CNBC’s “Squawk Box,” “No, most likely the primary control knob is the ocean waters and this environment that we live in.”

“The fact is this shouldn’t be a debate about is the climate changing, is man having an effect on it. Yeah, we are. The question should be just how much, and what are the policy changes that we need to make to effect that?” he said.

Environmental Protection Agency Administrator Scott Pruitt told “Squawk Box” in March he does not believe carbon dioxide is a primary contributor to global warming.

Those statements contradict the public stance of the Environmental Protection Agency. The EPA’s webpage on the causes of climate change states, “Carbon dioxide is the primary greenhouse gas that is contributing to recent climate change.”

Perry and Pruitt’s views are also at odds with the conclusion of NASA and the National Oceanic and Atmospheric Administration.

Despite those conclusions, Perry said, “This idea that science is just absolutely settled and if you don’t believe it’s settled the somehow you’re another neanderthal, that is so inappropriate from my perspective.”