The cruise industry has seen backlash from the media, environmental activists and government bodies following research demonstrating the damage cruise ships cause to the environment. Concern surrounding the environmental impact of cruise ships has led the industry to take steps towards a greener, more environmentally friendly future.
Leading independent German pollution analyst company Axel Friedrich stated that a single large cruise ship emits over five tonnes of NOX emissions per day and emits...
https://www.ship-technology.com/features/future-fuel-the-pros-and-cons-of-lng-cruise-ships/