In a new video from the environmental group Sierra Club, children take turns reading tweets from Republican presidential nominee Donald Trump about climate change. And even the kids think they’re bonkers.

Trump has a long history of dismissing the reality of climate change. He has repeatedly called it a “hoax” and posited that it was an idea the Chinese created to steal U.S. jobs.

In the Sierra Club video, one girl reads a tweet in which Trump calls global warming “bullshit.” She looks shocked, asking, “Can someone who wants to be president say that?”

The ad closes with a clip of a boy telling Trump that it’s “time to stop kidding around on climate.”

The Sierra Club, which has endorsed Democratic nominee Hillary Clinton for president, also released a video the day after the first presidential debate, during which Clinton accused Trump of denying climate change, and then Trump denied his denial. That video shows an ice sculpture of the presidential hopeful melting, as his own comments denying climate change play.

Clinton acknowledges that climate change is real and has advocated for clean-energy alternatives. She plans to campaign in Florida, which was just hit by Hurricane Matthew, on Tuesday with former vice president-turned-climate advocate Al Gore. They are expected to talk about climate change.

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