[tbirrell]

Pursuant to the arguments that ships are "even worse" than planes, it is worth noting that a lot of ships (especially cargo) are built specifically to burn bunker fuel (residual oil left over after gasoline, diesel and other light hydrocarbons are extracted from crude oil). This is partly because the thought is that _someone_ will burn it, so you might as well use it in the middle of the ocean, away from all the pollutants generated by the land bound population.

And realistically, that's the best thing you can do for the environment until such time as literally everyone on earth agrees to not use it (which is staggeringly unlikely). Because by burning on its own in the middle of nowhere, the ecosystem is can handle it without fuss. Whereas burning it on land (in a power plant presumably), you merely help overload that ecosystem since it is already having to handle everything else.

[pjc50]

Bunker fuel is "crackable". It can be made into lighter fuels and the sulphur removed, it's just expensive to do so.