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They're (really, Really) Bad for the Environment

Cruise ships are among the worst offenders when it comes to environmental impact. Part of the reason for this is that they use a fuel that's sometimes referred to as "bunker fuel." It has around 5,000 times more sulfur in it than normal gasoline. Needless to say, that makes it absolutely terrible for the environment. In recent years, some cruise ships have installed filters in order to trap some of their emissions.

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It's actually estimated that cruise ships produce more carbon dioxide annually than any other type of ship, partly due to all of the amenities they have to keep running on board.