Pollution sprayed into atmosphere, climate change

"Spray pollution into the atmosphere to stop it from warming … You put, say, 20,000 tons of sulfuric acid into the stratosphere every year. And each year you have to put a little more … we put 50 million tons of sulfuric acid in the air now as pollution and it kills a million people a year worldwide … We're talking about 1% of that, a tiny fraction of that."

Colbert: "If it kills a million people, we're only doing 1% more. We're just killing 10,000 more people."

Keith: "It’s an old idea. This has been known since President Johnson's"

Colbert: "Maybe it's happening already. You ever look those planes up there? They have contrails behind them … Maybe they're actually spraying chemicals or the atmosphere right now... "