ERIC BOLLING (CO-HOST): All right, look, I'm not a climate denier. I just need to see proof that A, we're causing temperatures -- man is causing temperatures to rise, and, B, this poses dire risk to humanity before we spend trillions trying to fix a problem we don't fully comprehend. That's just me. We'll bring it around quickly. Greg? 

GREG GUTFELD (CO-HOST): It's true. It comes from the bottom up because he is an ass. All right, what he just said violates the first rule of science. When you say science is settled, the entire scientific method is based on being proven wrong. Every scientist welcomes a challenge. You have to wonder about a belief system that doesn't want any challenges, that doesn't want any of their theories to be questioned. This -- what he is talking about is radical Islam of science. He is actually turning science into a religion. However, on the other side, do not call it a hoax because you play into their beliefs, demand evidence, demand evidence, climate change has existed since the Big Bang. 

Previously: 

Fox's The Five Uses Earth Day To Push Debunked Climate Change Denier Myths

MSNBC’s Morning Joe Features Arctic Experts To Explain “Dire Warning Signs” Of Climate Change

Scorecard: Tracking Climate Change Questions In Presidential, Senate, And Governors' Debates