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Can't think of a reason boats would be below cars other than maybe polluting aquatic environments
I think it's probably referring to yachts rather than ocean liners.
Ocean liners are all but extinct. They've been supplanted by cruise ships which are utterly horrific for the environment.
What about boats with sails?
Sailboats shouldn't be that bad considering what goes into their construction and that they don't actively produce pollutants beyond whatever wears off your rope and I guess painting the hull every couple of years.
Boats put out more CO2 than cars. Water is more dense than air and friction of tires and rolling and etc. Boats are overall worse for the environment both on climate change and environmental damage.
This guy's gonna drive his boat to work!
There isn't a canal, inlet or fjord everywhere.