I give a hoot but we all pollute

On the back of a big truck today, I saw a placard declaring:

"CO2 is not a pollutant."

I wondered about the reasoning behind such a statement.

What, after all, is a pollutant?

I would venture, any substance introduced into an environment, that has an adverse effect upon that environment. Makes no difference if it is generally benign or "natural." It is entirely possible that a tanker truck of orange juice could tip over into a creek and kill the fish, thus making O.J., in this case, a pollutant.

Carbon dioxide is rather common. You make it within your own body. It won't kill you to breathe it ... so long as there also happens to be some oxygen in the neighborhood. Perhaps the placard people meant to emphasize this fact.

Of course, the current worry is that too much CO2 is heating up our planet. Perhaps the placard people disagree. Guess we will all know soon enough, one way or the other.