Gram for gram or tonne for tonne, most other stuff is much worse. But mile for mile and kWh for kWh, the relative quantity of CO2 more than makes up for its rel

Gram for gram or tonne for tonne, most other stuff is much worse. But mile for mile and kWh for kWh, the relative quantity of CO2 more than makes up for its relative harmlessness. (Except maybe in dirty ships where there is much more of the nasty stuff per tonne of CO2 than in the exhaust gases of any other mode of transportation - they are basically using the skies over international waters to dispose of refinery waste that would be impossible to legally burn anywhere else)