How much damage do cruise ships do to the ocean?

On average, a cruise ship generates 15 gallons of toxic chemicals each day. These materials come from on-board dry cleaning and photo-processing facilities, painting and other activities. Seven thousand gallons of oily bilge water are released into the oceans every time the ship empties its bilge tanks.



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When cruise waste is dumped into the ocean, it creates acid in the waters while decreasing oxygen levels. The result — algae blooms that further threaten coral reefs. The complex marine life that calls our ocean waters home are all being poisoned by the ship waste dumped into their habitat.

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Cruise ships, huge compared to other vessels, end up burning more heavy fuel oil, one of the dirtiest fossil fuels on the market. This oil contains dangerous levels of sulfur and heavy metals etc. It is estimated that cruise ships use, on average, 150 tons of heavy fuel oil every day.

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A June study from sustainable transport campaigner The European Federation for Transport and Environment found that 63 cruise ships owned by parent company Carnival Corporation emitted 43% more sulfur oxides, a group of harmful air pollutants, than all the 291 million cars in Europe in 2022.

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Taking a seven-day cruise is more than three times as carbon-intensive as flying and staying abroad.

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During a typical one-week voyage, a large cruise ship (with 3,000 passengers and crew) is estimated to generate 210,000 US gallons (790,000 L) of sewage; 1 million US gallons (3,800 m3) of graywater (wastewater from sinks, showers, and laundries); more than 130 US gallons (490 L) of hazardous wastes; 8 tons of solid ...

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Do Cruise Ships Dump Sewage? Yes. To get into a few more specifics than above, the U.S. allows cruise ships to dump treated waste into the ocean if they are within three and a half miles from shore. Beyond that point, there are no restrictions for dumping untreated, raw sewage in U.S. ocean waters.

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Although the cruise industry unabashedly promotes itself as environmentally friend, the reality is that there is a long history of breaking the law, seeking all kinds of concessions and non-regulation by lobbying and local regulators; in addition to the progressive accumulation of hundreds of pollution violations, ...

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Every year, cargo, cruise, and fishing vessels kill an estimated 20,000 whales.

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You can see chunks of boat float away. A 2022 study found that out of 49 attacks that year, whales damaged ships in about 73% of interactions. And 25% of those had to be towed back to port. The study's author told Live Science that whales target about one out of every 100 ships passing around the peninsula.

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The good news is that cruise ships will rarely travel through a rough sea. They are equipped with the latest in weather tracking information and navigation systems so they can avoid any potential storm or heavy seas.

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A medium-sized cruise ship spews greenhouse gas emissions equivalent to those of 12,000 cars, while environmentalists accuse big industry players of investing little in decarbonization, and of covering up endless delay tactics in a heavy coat of greenwash.

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Cruise ships are a catastrophe for the environment — and that's not an overstatement. They dump toxic waste into our waters, fill the planet with carbon dioxide, and kill marine wildlife. Cruise ships' environmental impact is never ending, and they continue to get bigger.

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Fifteen ships earned failing scores last year, a figure that dwarfs the average failure rate of about two to four ships a year, a Miami Herald analysis of the CDC's historical inspection data found. The only year that comes close to 2017's all-time-high figure is 2013, with 10 failures.

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Modern cruise ships are, on average, 20% longer than the Titanic and twice as high. The average Royal Caribbean cruise ship is 325 meters long, 14 decks high and has a gross tonnage of 133,000. In comparison, the Titanic was only 269 meters long, 9 decks high, and had a gross tonnage of 46,000.

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Barcelona; Venice, Italy; and Key West, Florida; have each moved to limit large cruise ships in recent years for similar reasons. But as they say, a picture is worth a thousand words. Take a look at these striking photos and see for yourself why more cities are saying no to cruise ships.

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Using the associated calculated climate factor of 2.1 (for a 2,000-3,000 passenger ship), we estimate that one individual on a 7-day cruise will have a carbon footprint of 300kg per day if that individual stays in a standard double-occupancy cabin.

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