Do cruise ships contribute to global warming?

But just how severe is their impact on the climate? Unfortunately, taking a cruise takes a toll on the planet. Your trip will average anywhere from 700-1000 pounds of carbon emissions a day, which is much higher than flying, driving or a traditional 'land' vacation.



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Cruise ships directly contribute to global warming too, though. Carbon dioxide emissions from cruise ships visiting European ports in 2022 were the equivalent of emissions from 50,000 flights between Paris and New-York, according to the study — nearly a 17% increase from 2019.

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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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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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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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The most polluting cruise ships operator was MSC Cruises – whose cruise ships emitted nearly as much SOx as all the passenger vehicles in Europe. Accounting for all of its subsidiaries, the Carnival group polluted the most. Many cruise operators like MSC are investing in fossil gas (LNG) as a cleaner alternative.

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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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Port pollution: Cruise ships generate plastic waste not only while at sea but also while in port. This can contribute to plastic pollution in the surrounding waters and on nearby beaches.

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1. The Norwegian company Hurtigruten. Among the most environmentally sustainable ships are certainly the ships of the Norwegian cruise line Hurtigruten. The company has already eliminated heavy fuel oil (HFO) for more than a decade and uses alternative and greener fuels such as marine diesel oil and biofuels.

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The most obvious and climate-friendly solution is riding aboard a cargo ship, thousands of which cross the Atlantic each year.

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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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Traditionally, the leftover food on a cruise ship is ground by food pulpers, then pulverized in a paste or slurry to be stored until the ship reaches land. Once the waste arrives on land, it is transported to a facility for processing. These facilities could be a landfill or an anaerobic digestion plant.

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What happens to sewage from cruise ships? Black water, that is what gets flushed down toilets, is processed on board. After processing, the solids are separated out and off loaded and disposed of on shore. The water, which after processing is potable grade, is returned to the sea.

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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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These ships achieve eco-friendly operation by employing a range of practices to reduce carbon footprints and waste. Common Features of Eco-Friendly Cruise Lines Include: Energy-efficient systems: such as LED lighting, low-emissions engines, and optimized hull designs to reduce fuel consumption and emissions.

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