“Immigrants cause global warming!” says Stephen Colbert. “It’s always an immigrant who’s cutting my grass with an exhaust-spewing lawnmower. … And their spicy food always increases my emissions.”

In a smart segment this week, Colbert rips apart noxious ads that criticize immigrants for increasing their carbon footprints. The ads, being run on MSNBC, come from anti-immigration group Californians for Population Stabilization. Watch:

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