You would be to remember that there are other people in the world than the USA and/or Europe. There are billions in Asia and they are getting more consumer good by the day. Goods that need to be made. Resources which have to be mined and smelter. It is the whole process which emits, not just the cars, although transportation plays an important part in human CO2 emissions.
I have the answer for you free-market loving American. Technological singularity. Then we let it decide what to do. Hopefully it will understand that reason is more than 2+2=4 (if that is even true in the first place). Otherwise, it will do what we will have to do to ourselves in due time. Malthus is rolling in his grave, laughing at the idiots who did not take him seriously.
Something
extra to sink you mind into.