Carbon dioxide: "We breath it out."

(Not to mention it's in all those soft drinks.)

And plants breath it in. See? Not to worry, claims the warm and fuzzy (especially fuzzy) Competitive Enterprise Institute in two recently released carbon-dioxide-is-good-for-you TV commercials.

Think Progress » New Ads Funded by Big Oil Portray Global Warming Science as Smear Campaign Against Carbon Dioxide

And here's another thing, Bunky. Carbon dioxide helps keep you safe from breathing too much oxygen.

"...oxygen may be what ultimately kills you, rusting your body from the inside in a process called oxidation and free-radical production. Breathing pure oxygen creates an abundance of free radicals."

So there you go. The Competitive Enterprise Institute and their pals at ExxonMobil are helping to keep you safe from breathing too much oxygen. Gee, thanks, Competitive Enterprise Institute! You're like a breath of fresh air!

Or, OK, maybe not.