actually, diesel is not as harmful as ppl think. there's less carbon monoxide but the particulates are like black fog. dirty but not as toxic as invisible or almost invisible gasoline emissions. aviation is WAY more toxic but electric planes can't fly long enough due to the power requirements to fly 30K feet in the air
between a 1970s chevy 454 and the 6.2 detroit, the detroit was less toxic but had HUMONGOUS amounts of thick, foggy smoke. 454 had barely visible but much more harmful carbon monoxide. today most fossil fuels are cheaper and nowhere near as toxic, due to lack of lead dissolved in fuels and catalytic converters
in fact, just 300 out of 5000 of the world's ocean liners make up WAY more emissions than all 1.5 billion automobiles in the world. 300 is just tears on a river to 1.5 billion (1,500,000,000) on a 1:1 ratio of ocean liner to car, electric cars really have no effect, if anything they're more polluting bc they use recycled materials, which requires fossil fuels, usually very dirty burning types of fuel. CO2 is not the toxic thing to worry about, it's CO1
CO2=you literally exhale this
CO1/CO=common suicide method/extremely toxic and invisible gas
the catalytic converter actually kills carbon monoxide so the smoke is just burnt fuel particles, diesel makes almost no smoke, but earlier 2000s diesels had little emissions despite having nothing more than a catalytic converter and a muffler. muffler is just to make exhaust quieter and in cases, modified for performance. now we have DEF on new diesels which acts like a washing machine for the exhaust filter, but it still clogs exhaust up (main reason why ford super duty ends up in a repair shop). Gasoline doesn't have any exhaust filter, just a catalytic converter for emissions, but is also less powerful and less efficient due to higher burning point.