Cruise ships emit about three times the CO2 of airplanes (per person), but they also generate a lot of different types of pollution that planes do not from their garbage and their sewage.

Here’s a source. You will note that it doesn’t even take into account the fact that people frequently fly to the start of the cruise and then back from that port to home at the end.

(Two seconds' Googling would have found the answer - but that would require a tiny bit of interest in getting the right answer.)

Do you not understand the problem? In order to not destroy our own biosphere and ourselves we have to decrease our carbon dioxide by over 90%. 90%!

This means we have to cut back drastically on everything, and that includes international travel;.

Cruise ships are a particularly low-hanging fruit because no one uses a cruise ship for for essential travel as it's too slow, it's the most polluting form of travel we have.

Unfortunately, we won't actually give up on anything, because of people like you. Any possible change is countered with, "Think of the jobs!"

Would this be your plan?

1. Change absolutely nothing at all

2. Destroy the world's biosphere

3. Most of us die and millions of species go extinct

4. Profit!

Well, congratulations - we're certainly going to execute steps 1 through 3 on your brilliant plan. It's step 4 I'm a bit dubious of.