Did you know that plants grow faster the more CO2 is in the air? Optimal growth is reached at 1500 ppm, we are at 400 ppm right now. The real issue are the chemicals that kill the insects & microorganisms.
Totally. Organic, using/making compost is ideal, and promotes microorg growth, and pest resistance. I have a co2 ppm reader at my house, its at 414ppm outdoor air this second.
Yeah CO2 is good for plants, the smog in the pollution from factories and cars that is not CO2 is bad, I don't know what else is in the smog besides CO2 though.