There are stacks of these for carbon and anything else that has ever been considered to be "regulated". Would you like to critique a few? Or share ones that favor your position?

Or are you unaware of them and that is why you posted earily that "cultists never think about these things"?

That's what many in industry have said about ozone, sulfphur, nitrogen, etc....

Meanwhile air quality has improved substantially in the US with less smog and ozone both. Acid rain has gotten less bad and some lakes that were sterilized by it have seen their pH rise to a point that they again support some aquatic life. Mercury concentrations in places like the Everglades have dropped though there is still a lot of work to do on that front. That is in spite of all the kicking and screaming by you people whenever things like pollution control devices on cars were required or the cap and trade program for sulfur was instituted.

Go ahead an name the contaminants in air or water that is at harmlessly low concentrations that are regulated or proposed for regulation just for the hell of it

You name CO2 by default given what you have posted in this thread but it is above ppb by a bit and there are demonstrable effects so you can't claim that it is totally harmless. I can talk about effects beyond temperature, e.g. biological and chemical effects of having more CO2 around, effects that are going to cost somebody something.

Surely you have other ppb things to list given the generality in your statement.