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Actor Alec Baldwin thinks anyone who's skeptical about the threat of climate change suffers from a form of mental illness.

As world leaders converge in New York to sign a landmark climate deal, Baldwin joined indigenous leaders on Thursday to call on the United Nations to combat climate change.

Baldwin demanded a halt to deforestation, allegedly a contributor to global warming, by giving indigenous people rights to their land.

"There can be no successful climate agreement and no future for our planet without greater protection of the world’s forests. Everyone in the room understands this," Baldwin said during an appearance at the UN.

In an interview with AFP, Baldwin also had some strong words for the people who don't agree with his climate change agenda.

"So much of what’s going on now is something that we have to treat as like it's a mental illness," Baldwin said. "I believe that climate change denial is a form of mental illness."

Watch the video here, and let us know what you think about Baldwin's remarks in the comments.

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