I'm not actually sure if what I just wrote is parody or not. Arguments about "free markets" are always weird like that, since everybody seems to work with a different definition and they don't really seem to exist
I mean obviously the subsidies are bad but removing them isn't going to solve much of anything by itself.
Yea, this just isn't true. Rich people will just pay more for the same thing. Poor people will just have to pay more to even get to their jobs. It's pure laziness to put this on dogma rather than actually come up with decent policy to shape the market.
What alternative is there to a private jet or a yacht? No, you have to get the fear of prison (or worse) in them to get them to act in a socially rational manner.
But to actually answer your question, battery-electric yachts or aviation powered by biofuels.