Combustion vehicles have other externalities, like contributing to the city heat island effect. All in all even a compact car going through the city is equivale

Combustion vehicles have other externalities, like contributing to the city heat island effect. All in all even a compact car going through the city is equivalent to a 5-10kW heater. Also gasoline combustion doesn't just produce CO2. Emissions include NOx, CO, unburnt hydrocarbons - even in this day and age it's a significant amount.