Facepalm Moment in a Discussion of Facepalm Moments

In the course of a discussion of “facepalm moments,” We find the following:

And then there's Michelle Bachman, who wants us to understand that carbon dioxide is a natural part of Earth. Yep, just like acid, radiation, and plutonium. All natural parts of Earth. "There isn't even one study that shows carbon dioxide is a harmful gas. It is natural," she says. "It is not harmful. It is part of Earth's life cycle." Yep, it may be natural — but that doesn't mean you want to pour a lot of it into your lungs.

Sigh. I doubt if the amounts of CO₂ likely to be emitted in the foreseeable future will be anywhere near a toxic amount. They would have been on firmer ground had they pointed out that a heavy coat won't poison you but you would not want to wear it in the summer.