People usually think cars are the biggest sources of emissions but it's not even close. All transportation (car, planes, trains, etc) represent 14% of global emissions.
Globally the biggest source of emissions is energy production which represents about 35% (25% of direct emissions and 10% of processes like refining fuel).
Globally the biggest source of emissions is energy production which represents about 35% (25% of direct emissions and 10% of processes like refining fuel).
https://www.epa.gov/ghgemissions/global-greenhouse-gas-emiss...
So, I doubt emissions from ICE cars would be as bad as widespread nuclear residues from nuclear cars.