Okay I will cede the point on CO2 being a 'pollutant'.   Nonetheless is can be toxic in too high concentrations and it is fair to say the effect of rapid increases in CO2 during industrialization are not well understood (not to say that atmospheric levels are approaching a toxic level for say human life of course).

I'm not trying to overstate the significance; I just don't think it is well enough understood to dismiss it entirely.   Largely I see the left/socialist climate change agenda as being overstated as well for (apparent) political reasons.

Further research is warranted if it can be separated from the political hysteria.