We always knew that Bill Nye the Science Guy was a bad ass when it came to, well, science stuff, but a recent video with over 3.5 million views shows that he’s also another kind of bad ass.

He recently guest starred in a segment on climate change during ‘Last Week Tonight’ with host John Oliver, and it was epic.

You can watch the segment starting at 18:15 here…

Yeah kids… Nye says we all need to “Grow the fuck up.”

Why? It should be obvious, but I’ll let Nye say it…

“Safety glasses on.

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 fucking fire.”

So how do you put out the fire? We’ve got plenty of tools at our disposal, but as Nye points out… money will always be involved.

“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! Grow the fuck up.”

Bill Nye has clearly had it with this bullshit and he’s not shy about telling us…

“You’re not children anymore.

I didn’t mind explaining photosynthesis to you when you were twelve. But you’re adults now, and this is an actual crisis.

Got it?”

Seriously, watch the whole show. It’s incredibly important that we understand what’s at stake.

If not for yourself, then for Bill Nye.