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If you would be sailing, it would probably have the less impact on the environment. But a Diesel powered ferry ? I have no idea how it compares to air flight. The train is probably better than both ferry and plane in this case.
Rail is the most carbon efficient land transport, but anything on the water will beat it on emissions.
Assuming both use on board combustion engines, yes. But a train connected to a majority green energy power grid is probably more carbon efficient than most boats.
For strictly passenger vessels yes, but once large amounts of cargo get involved shipping takes the win every time.
A ferry or other regular short-run vessel can be electrified too. The tour boats at Niagara falls switched to pure-electric a few years back, and they're plugged in to recharge during onboarding and off boarding.
Yes, that's as far as I was thinking as well.