Rich people have money, but they aren't stupid: why would they throw their money away on nonrenewable energy when they can just switch to something cheaper?

> Rich people have money, but they aren't stupid: why would they throw their money away on nonrenewable energy when they can just switch to something cheaper?

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.

To begin with, private jets and yachts are a trivial proportion of carbon emissions, so they're not really what matters.

But to actually answer your question, battery-electric yachts or aviation powered by biofuels.

Sure, but it's rather indicative of larger use of carbon emitting technology. Neither of your suggested replacements actually exist in any meaningful way, and virtually every investment comes with significant CO2 emissions.

Battery-electric yachts and biofuels aren't popular because they're more expensive, not because there is any technological barrier to their existence. Make them the less expensive option and market demand for them increases.

Or, we could just make yachts illegal.