The idea
All pollution is bad and all sensible people want to minimise it but hang on:-
Co2 is somewhere between 17 and 20 times less of a greenhouse gas than Methane (so about 5 or 6 percent as bad) yet no great effort is being made to reduce that.
The effect of Co2 on our climate is tiny (1 or 2 percent) compared to the variations of the Sun's electromagnetic radiation and the effect of that on our upper atmosphere.
Trees and other plants breathe in Co2 and breathe out Oxygen.
If exhaust emissions from engines were so bad there would be bare strips of earth either side of roads and railways – instead plants flourish there.
Why is it important?
Government should stop penalising us so much for Co2 emissions and concentrate on ones more harmful to our health. If they want to affect 'Climate Change' they should concentrate on things that will have more than a 1 or 2 percent effect – have stern words with the Sun about its 'solar wind' or stop living things emitting Methane. Whatever they do they should not use public money for it though or it would be like paying millions to King Chanute to hold back the tides.