Bill Nye was forced to explain global warming to a conspiracy theorist while on Piers Morgan Tonight.
A man was arguing that even though global CO2 levels are rising, it's not changing the climate.
Even though basically every scientist in the whole world agrees it totally is.
This isn't the first time Bill has had to step in and tell folks how it really is.
Thanks for doing your part to save the human race, Bill!
Check out the video (above) to hear a man try and argue against the most awesome Mr. Nye.