Patrick Moore, the co-founder of the environmentalist group Greenpeace, ripped into New York Democratic Rep. Alexandria Ocasio-Cortez over the weekend as a “pompous little twit,” saying the Green New Deal plan she’s advocating is “completely crazy.”

In a series of tweets, Moore argued Ocasio-Cortez, who has called for drastically reducing fossil fuel production, doesn’t realize what would happen across the world if the radical plan were implemented.

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“If fossil fuels were banned every tree in the world would be cut down for fuel for cooking and heating," Moore said in a tweet Saturday directed at Ocasio-Cortez. “You would bring about mass death.”

Moore left Greenpeace after 15 years and is now critical of the group, later writing the book, “Confessions of a Greenpeace Dropout: The Making of a Sensible Environmentalist.” Greenpeace, years ago, distanced themselves from Moore and say he overstates his past affiliation with them.

Referring to the New York Democrat as a “pompous little twit,” Moore said, “You don’t have a plan to grow food for 8 billion people without fossil fuels, or get food into the cities.”

Moore also unloaded on her for calling climate change “our World War II.”

“It's her @GND that would be worse than WW2,” he said. “Imagine no fuel for cars, trucks, tractors, combines, harvesters, power-plants, ships, aircraft, etc. Transport of people & goods would grind to a halt.”

In another tweet, Moore called the Green New Deal “so completely crazy it is bound to be rejected in the end.”

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He also referred to Ocasio-Cortez as a “garden-variety hypocrite,” in response to a New York Post story that said the Democrat frequently used gas-guzzling Uber and Lyft rides during her 2018 campaign instead of taking the subway station near her campaign office.

“You're just a garden-variety hypocrite like the others. And you have ZERO expertise at any of the things you pretend to know,” Moore said.

Ocasio-Cortez responded to that story over the weekend saying she’s “living in the world as it is.” But she said that shouldn’t be “an argument against working towards a better future.”

“The Green New Deal is about putting a LOT of people to work in developing new technologies, building new infrastructure, and getting us to 100% renewable energy,” she said.

Meanwhile, Travis Nichols, a spokesman for Greenpeace USA, strongly pushed back against Moore’s comments on Monday, saying he doesn’t represent Greenpeace. He disputed that Moore is a co-founder, though Greenpeace admits Moore "played a significant role" in its early years.

“His statements about Alexandria Ocasio-Cortez and the Green New Deal have nothing to do with Greenpeace’s positions and should not be reported as such,” Nichols said in a statement. “Mr. Moore frequently cites a long-ago affiliation with Greenpeace to gain legitimacy in the media, and media outlets often either state or imply that Mr. Moore still represents Greenpeace. He does not.”