They travel very long distances that would make batteries impractical, but they tend to use very dirty forms of fossil fuels and could be made much cleaner.
That actually puts the whole situation into perspective a bit. The global bourgeois don't want to switch over from gas and coal because, even though electricity is more efficient, trade would go down as a whole. Similar thing happens with overfishing. They do it so the work is done, not for markets
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I wasn't sure if it was fluff, or fact.
https://www.forbes.com/sites/michaelbarnard/2023/12/05/how-will-climate-action-change-the-face-of-global-shipping/