Jeremy Clarkson's well-known for being a petrol head, as the presenter of Top Gear and The Grand Tour, who has a passion for fast cars.
Now the 59-year-old has launched an extraordinary attack on environmental activist Greta Thunberg, who is 16.
He told her to "shut up and go back to school", as he described her as "mad and dangerous".
The broadcaster was fired by the BBC for rowing with a producer over a steak.
He's a long-time critic of the science behind global warming, but recently had a slight change of heart after filming in south east Asia.
He said in the interview in Australia: "She's mad and she's dangerous and she's causing young children sleepless nights with her idiocy," he said.
"I think she needs to go back to school and shut up."
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Just days earlier, in another interview he had described Thunberg as a "stupid idiot" who had a "bad temper".
Clarkson claimed to have been aware of climate change for "quite some time".
Thunberg arrived in Portugal this week after a three-week voyage across the Atlantic, saying she had felt "energised" by the journey in her fight against climate change.
Her solo protests outside the Swedish Parliament helped draw the support of young people around the world.
She refuses to fly on planes because of the amount of emissions they create, leading to increased greenhouse gases.
In a speech at the Climate Action Summit 2019 she told delegates: "You have stolen my dreams and my childhood with your empty words."
Environmental campaigners dumped manure on Mr Clarkson's front lawn in 2009 in a protest on his attitude towards climate change and his passion for high-powered cars.
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