Bill Nye said Monday that climate change skeptics suffer from a psychological problem preventing them from understanding how so-called man-made global warming affects their daily lives.

Climate change skeptics suffer from cognitive dissonance on global warming, a type of psychological disorder that prevents people from recognizing reality, the comedian and former TV show host told Vermont Sen. Bernie Sanders during a Facebook Live event.

“To the deniers out there. I want you to think about what is called cognitive dissonance,” Nye said, referring to situations wherein people prefer to bury their head in the sand instead of facing reality. It’s up to environmentalists and everybody else to save skeptics from themselves, he added.

“Instead of accepting that the climate is changing, deniers are denying the evidence and dismissing the authorities” simply because they don’t want to face a harsh reality, Nye said.

The two climate change warriors went on to complain how fossil fuel companies’ unwillingness to change their ways could lead to catastrophe.

“I know it may not be very popular thing to say, but the long-term implications of doing nothing about climate change are catastrophic,” Nye said about what could happen if Americans don’t take seriously President Donald Trump’s skepticism.

Nye, who has a history of making dubious comments directed at skeptics, also brought up what he calls the connection between so-called denialism and the cigarette industry’s refusal to acknowledge the negative health properties of cigarettes.

“It’s amazing to me that fossil fuel companies continue to use the same tactics as the tobacco industry,” Nye told Sanders.

The comedian has made similar comments in the past.

“Was it appropriate to jail the guys from Enron?” Nye asked in a video interview with Climate Depot’s Marc Morano in April. “We’ll see what happens. Was it appropriate to jail people from the cigarette industry who insisted that this addictive product was not addictive, and so on?”

“In these cases, for me, as a taxpayer and voter, the introduction of this extreme doubt about climate change is affecting my quality of life as a public citizens,” the former children’s TV host said at the time. “So I can see where people are very concerned about this, and they’re pursuing criminal investigations as well as engaging in discussions like this.”

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