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It's funny to say "100% green", since in this particular case you need also to look how much pollution was made in the building process of a yacht, and if the price pays off with it being 100% green.

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Or where the hydrogen comes from (currently the huge majority of commercial hydrogen originates from fossil fuels)

Things might have changed, but back in the days they usually just flared off hydrogen sulfide because it was hard to deal with and not very profitable. You more or less had to force the oil companies to collect it.

So yes - often a byproduct of oil production, but if the oil companies had it their way, they'd burn it on the spot.

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