This conversation is about air quality. The use of the word pollution is clear. Further we are talking specifically about areas where ships frequent, so if now

This conversation is about air quality. The use of the word pollution is clear. Further we are talking specifically about areas where ships frequent, so if now you want to claim victory by citing someone living mid-continent... No one gave a pass to cars. But the cold, hard truth is that for air quality pollution of all sorts, cars have improved dramatically[1]. Cruise ships have not. [1] - Even in Europe where diesel is far more prevalent, and the problems it brings. A relatively tiny cruise ship industry still eclipses the car industry for every variety of air quality pollution, by a magnitude plus.