[lmm]

> the cruises pollute the air of the city

Per-person? Surely anyone arriving by car, aeroplane or even bus is causing a lot more pollution, just on the sheer physics of how much more efficient sea transport is.

> Also, cruise visitors use the city's facilities (roads, trash collection, beaches, etc) but don't leave much money behind to compensate.

Surely that can be balanced with appropriate taxation - I believe a lot of places already levy a per-passenger tax for cruise ships berthing there.

[c22]

Are you sure about that? A quick search for carbon per passenger cruise ship vs airplane returned several results[0][1][2] suggesting that the airplane is in fact a more eco-friendly way to travel.

[0] https://www.sierraclub.org/sierra/ask-mr-green/which-better-...

[1] https://www.theguardian.com/travel/2006/dec/20/cruises.green

[2] https://grist.org/living/you-thought-planes-burned-a-lot-of-...

[lmm]

I can believe those numbers saying that a transatlantic cruise would be 3-4x the emissions of a transatlantic flight. But the per-passenger-km figure isn't a realistic basis for comparison; tourists aren't trying to travel x kilometres, they're trying to see places x, y and z. The substitute for taking a 1000km cruise 5000km away from where you live is not 11000km of flying, it's more likely making two or three 10000km round-trips. And if you did replicate a cruise by flying between successive ports of call then the efficiency figures for those short-haul flights are going to be an order of magnitude worse than for a transatlantic flight.