Former California Gov. Arnold Schwarzenegger (R) during a speech at a 200-nation climate change conference in Poland on Monday said that President TrumpDonald John TrumpProsecutors investigating Trump inaugural fund, pro-Trump super PAC for possible illegal foreign donations: NY Times George Conway: Why take Trump's word over prosecutors' if he 'lies about virtually everything' Federal judge says lawsuit over Trump travel ban waivers will proceed MORE is "meshugge" on the environment, the Yiddish word for "crazy."

Schwarzenegger, a longtime climate activist, told the audience in Poland that he believes that local leaders in the U.S. are still committed to the Paris climate accord, although Trump has publicly declared that the U.S. intends to withdraw from the international agreement.

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The United Nations conference in Poland is aimed at providing a venue for signatories of the Paris climate accord to discuss how to implement their commitments to reduce greenhouse gas emissions. 

"Every time you talk about America, you’re right when you say that our leadership in Washington is a little bit backwards, but you’re wrong when you say that America dropped out of the Paris agreement," Schwarzenegger said.

"Because if you look a little bit beyond Washington, you will see that it is the states and the cities, it’s local governments, that control 70 percent of our emissions," he said. "And you will see all the extraordinary work that is going on at the state and city level in America." 

"Yes, we have a meshugge leader in Washington that is not in, that is out, but remember that America is more than just Washington or one leader," the action-movie star told the audience. 

Trump stands at odds with the bulk of the international and scientific communities as he expresses skepticism about the validity of human-caused climate change. He and his administration have been downplaying the findings of a dire federal climate change report released at the end of last month, which warns that the U.S. will lose hundreds of billions of dollars and face devastating consequences if it does not confront the issue of climate change head-on. 

The “conference of the parties," known as COP24, is dedicated to discussing the existential threat of climate change.

The U.S. withdrew from the Paris accord last year.

Schwarzenegger said that he believes the "biggest evil is fossil fuels." 

"It's coal, it's gasoline, it's the natural gas," he said. He added that he believes the conference delegates should include state and local representatives from the U.S. during next year's climate conference. 

"And if you do that, I promise you: I'll be back," he added, referencing his signature line from "The Terminator."