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I suppose there's more, ethanol and methanol, synthetic natural gas.

It is a shame petroleum-based fuels are so damn convenient.

none of those three, but I expect a combination of methanol, biodiesel and (only for near-shore and inland shipping) battery electric.

I propose submerged stainless steel cables pulling boats from underneath, powered by deep geothermal converters.

Synthetic hydrocarbon analogues.

Or wind

Might have niche-applications, but a nuclear-powered container ship can do many more trips in the time it takes this to do 1 trip.

We’ve come full circle.