If those that truly believe (I don’t) that man causes global warming by putting CO2 into the atmosphere, then the first thing to be called for would be elimination of the catalytic converter on the billions of cars driving around with them installed and working.
That source will never be touched because to get the CO2 the CO gets an extra oxygen added. Talk about unintended consequences. But then CO2 is NOT a pollutant as claimed.
Catalytic converters work on unburned hydrocarbons. They don’t do anything to CO2 in the exhaust.