Bill Nye used adult language to explain climate change to adults on Sunday night's "Last Week with John Oliver."

What did he say?

During a segment on Oliver's HBO show, Nye — famous for "Bill Nye the Science Guy," as well as his staunch liberal schtick on climate change — appeared to demonstrate the effect of climate change on the planet.

Oliver, who was fact-checking Rep. Alexandria Ocasio-Cortez's (D-N.Y.) comprehensive Green New Deal, cued a segment Nye filmed for Oliver's show. The Senate voted the deal down in March.

The late-night show host was also discussing a new report from the U.N. that warned that the planet could experience a lasting change as early as 2040 due to climate change.

Oliver went on to publicly implore Nye to present a visual to accompany Oliver's remarks.

"Bill, please, please!" Oliver begged. "Do you have a fun experiment for us?"

An exasperated-looking Nye appeared on the video in his lab coat at a table stocked with a globe, a blanket, a fire extinguisher, and a pile of sand.

"Safety glasses on," Nye said. "By the end of this century, if emissions keep rising, the average temperature on Earth could go up another 4 to 8 degrees.

"What I'm saying is, the planet's on f***ing fire!" he said.

With that proclamation, Nye pulled out a blowtorch and blasted the globe, which immediately burst into flame.

"There are a lot of things we could do to put it out." he said, gesturing to the sand, blanket, and fire extinguisher, "Are any of them free? No, of course not, nothing's free, you idiots!



"Grow the f*** up!" he cried. "You're not children anymore! I didn't mind explaining photosynthesis to when you were 12, but you're adults now, and this is an actual crisis! Got it?!"

"Safety glasses off, motherf*****s," he said, and blew on the flaming globe. When it was evident that he couldn't extinguish the blaze, he walked out of the shot and waved it off, clearly disgusted.