CO2...and other pollutants
How long will it take for us to realise that CO2 is NOT a "pollutant".
We'd all die very quickly without it as nothing would grow - at all.
Trebling the normal atmospheric CO2 concentrqation makes plants grow faster - which is hardly a surprise if you cast your minds back to Biology lessons on photosynthesis at school.
It is as essential and as life-giving as oxygen. Some pollutant!