Each 1m2 (square meter) of atmosphere above the earth contains 3kg of CO2. Buring 1 kg of oil generates almost 3kg of CO2. So for each 12 km you drive you put as much CO2 into the atmosphere as there is in 1m2 above the earths surface.

On average we drive 10.000km per year. So we put the same amount of CO2 into the atmosphere each year as there is in 1000m2 above the earth!

I'm just certain you mean m^3, cubic meters.