Don't you see the problem?
If it's too complex and there are too many variables how can you possibly say you've isolated changes in the de minimus trace element CO2 as "THE" culprit?
I can't, however reducing polloution and such is good for the earth and us as well.
We could still be sucking in lead fumes from automobiles.
Raw sewage in our drinking water?
Acid rain from power plant emissions?
Mercury from power plant emissions.
Vehicle exhaust fumes also contain cancer causing agents.
CO2 is NOT a pollutant!
Water is not a pollutant, and yet it is one of the most deadly substances on earth.
It is all about balance.