How ridiculous. The earth has had far higher levels of CO2 in the geological past and CO2 is an absolute necessity for life. Since the eventual extinction of life is very likely to occur as a result of atmospheric CO2 decreasing below the threshold needed to maintain life, we should be promoting the use of fossil fuels to return at least some of the prehistoric CO2 to the atmosphere. We can’t return all of the CO2 to the air, as much of it has become bound up in biounavailable forms.
You are correct. CO2 levels of 270-280 in the 1900-1970’s level were near-deadly level 240 to 250.
Today’s level of 400 ppm, is allowing every plant on earth to grow 12% to 23% faster, higher, taller, wider with more roots, branches, leaves and fruits.
The use of fossil will peak by itself. We need motors for mobility but electric are more efficient. We need fossil for heat in winter so there will always be some demand.