“You’re looking at the glass as half empty. I’m saying the glass is half full…of carbon.” -Stephen Colbert

Description: Co-founder and director of 350.org Bill McKibben explains why the Keystone XL pipeline will mean “game over” for the climate. I’m glad Colbert pressed him on being a hypocrite for driving or riding in planes to get to the show. It’s something environmentalists have to address…and McKibben did.