I always wonder what happens if commercial air travel is banned. Cruise ships are obviously worse for the environment than planes, but are there ships that are fast enough to be feasible for people traveling for less than a month while actually being sustainable or are the americas and Australia just going to be effectively isolated from Eurasia and Africa?

It’s worth it if it’s the only way to survive, obviously, but I wonder what the effects would be. I’m a transatlantic immigrant, and I’d be willing to take a three month trip by ship to visit my family once a decade or so, but I can’t imagine most people wanting or being able to do that.