The fastes co2 car in the world?
Petrol cars produce CO2 as a combustion by-product, so it might
be said that whatever the fastest car in the world is the fastest
CO2 car.
There are no cars powered by CO2 - obviously - as any chemical
reaction starting with CO2 needs energy to produce another
substance. There might be a car somewhere powered by compressed
CO2, but this will stop moving when it runs out of pressure.
Consequently the fastest CO2 car is a parked car.