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Very soon the big ferries will operate on biofuel
Is there an actual plan on this, or is it just what you're hoping? Because generally speaking, 'biofuels' aren't taking off at all, mostly because it's simply not possible to produce enough of it to cover the current consumption, never mind produce it in a way that is actually 'better'.
Overall it's not a bad idea to use them where they are a by-product, but that can't replace any significant percentage of current fuel consumption.
I takes a lot of energy to refine it and what is left as a byproduct can’t just be magicked out of our equations. Very soon the big ferries will operate on biofuel and then it will be much less debatable.