Upon news that President Obama was putting the brakes on the Keystone XL tar sands pipeline, Stephen Colbert invited one of the ringleaders of the movement to end this dirty proposal, Bill McKibben, on his show for the usual verbal judo.

Colbert constantly tries to ploy McKibben. It doesn't work. McKibben sets him straight on how many net jobs the project would create, and how much damage it would do to the planet. You can see that he knows how to handle his bombast very well.

However, I do appreciate Colbert's optimism. He believes with the tar sands, the climate would be half full – of carbon, that is.

Video after the jump.

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