Physics professor William Happer told CNBC Squawk Box co-host Andrew Ross Sorkin to "shut up" and compared the treatment of those who reject the science behind climate change to the demonization of the Jews in Nazi Germany during an interview Tuesday.
Harper is part of a minority of scientists who claim, despite scientific consensus, that climate change isn't real.
Here's the video of the exchange:
In a 2009 interview with The Daily Princetonian Happer compared climate change science to Nazi propaganda. New York Times reporter and Squawk Box co-host Sorkin brought up the previous comparison.
From the The Daily Princetonian in 2009:
This is George Orwell. This is the 'Germans are the master race. The Jews are the scum of the earth.' It's that kind of propaganda," Happer, the Cyrus Fogg Brackett Professor of Physics, said in an interview. "Carbon dioxide is not a pollutant. Every time you exhale, you exhale air that has 4 percent carbon dioxide. To say that that's a pollutant just boggles my mind. What used to be science has turned into a cult."
In the Tuesday interview, Happer doubled-down on the comparison:
"I get called a denier, and anyone who objects to all of the hype gets called a denier. That's supposed to make me a Holocaust denier. You know, I'm getting tired of that and the comment I made was the demonization of carbon dioxide is just like the demonization of the poor Jews under Hitler. Carbon dioxide is actually a benefit to the world, and so were the Jews."