not to stir the pot,,
but, which is seen as worse for the environment,
a lightweight, 4 stroke(near silent, no oil spewage) jet ski with around 4-6 inches of draft, jet drive(no prop to hit coral, wild life).
or a heavy, 25ft skiff with around 1-2 ft draft, large prop, allot of them with nasty old 2 strokes blowing oil and fumes.
side by side, the jet ski is many times more 'reef' friendly than a skiff.
i stand by my idea that it is NOT the jet ski or it's design itself that people have their problems with,, it's the usual jet ski operator! it's not an enviromental issue,, to me.
don't condemn the machine.