Propulsion: Diesel. Why? The ultrarich could afford the most environmentally friendly propulsion ( e.g hydrogen for submarines ) . But as if climate change wou

Propulsion: Diesel. Why? The ultrarich could afford the most environmentally friendly propulsion ( e.g hydrogen for submarines ) . But as if climate change wouldn’t be a thing, the ultrarich simply don’t care about their CO2 footprints. Do they really think they can buy another planet?