Ron Johnson's swivel-eyed maniac

Q. What do you think the CO2 does up there? Does it have an effect?
Ron Johnson: I think it's sucked down by trees and helps trees grow.

Narrator: Plants use CO2. Therefore, more CO2 is good. It's one of the hardy perennials of climate denialism. Like most generalizations, sooner or later it runs afoul of the real world.

Video: The CO2 is Plant Food Crock.

Feat. "The Third Viscount Monckton of Brenchley."

Bonus denialist Crock of the Week: Sunspots.

'How I get painted as an extremist is beyond me.' — Ron Johnson