America’s favorite scientist is bluntly warning fans about the seriousness of climate change.

Bill Nye, 63, made a cameo on Sunday’s episode ofLast Week Tonight with John Oliverto explain the complexities of carbon pricing and the importance of Rep.Alexandria Ocasio-Cortez‘s Green New Deal.

In the satirical sketch, Nye, who hosted the PBS showBill Nye the Science Guyfor five years in the ’90s, ditches his trademark fun experiments, or what Oliver called “lighthearted demonstrations,” for an unfiltered approach to drive home the increasing risks of global warming.

“By the end of this century, if emissions keep rising, the average temperature on Earth could go up another four to eight degrees. What I’m saying is the planet’s on f—ing fire,” Nye said before engulfing a globe in flames.

“There are a lot of things we could do to put it out — are any of them free? No, of course not. Nothing’s free, you idiots,” he continued.

“Grow the f— up. You’re not children anymore. I didn’t mind explaining photosynthesis to you when you were 12. But you’re adults now, and this is an actual crisis, got it?” Nye concluded.

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Bill Nye

The Green New Deal, which Ocasio-Cortez and Sen. Ed Markey introduced earlier this year, aims to achieve net-zero greenhouse gas emissions, create jobs and secure clean air and water for all.

During his appearance, Nye also tried his hand at explaining “carbon pricing” in laymen’s terms.

Bill Nye.

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Nye previously called out climate change skeptics in season 1 of his Netflix series Bill Nye Saves the World with celebrity guests Karlie Kloss and Zach Braff.

source: people.com