Taking a seven-day cruise is more than three times as carbon-intensive as flying and staying abroad.
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Research shows that cruising emits up to four times more CO2 per passenger than flying. While air travel costs between 0,11 and 0,16 kg per passenger per kilometer – a significant amount -, taking a cruise ship adds up to a staggering 0,40 kilograms per kilometer.
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.
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.
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.
Hurtigruten. Hurtigruten was the world's first cruise company to phase out single-use plastics onboard. This 130-year-old Norwegian adventure travel company incorporates a sustainability ethos at its core.
Cruise ships are only permitted to release human wastewater that has been heavily treated. Solid waste is also treated and dehydrated but not released into any open body of water. Instead, it is disposed of through standard, onshore waste disposal methods once the cruise ship is in port.
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 ...
Flights emit 500 grams of carbon dioxide/metric tons of cargo per kilometer of transportation. However, ships emit only between 10 to 40 grams of carbon dioxide per kilometer. The carbon footprint of airplanes is 20 to 30 times more than ships.
“Cruising is less stressful and also means you do not lose time commuting and travelling to a destination as you will be eating, watching shows, drinking with friends and sleeping in comfort as the ship takes you to the next destination. It is a more efficient and enjoyable use of your time.”
Aviation is responsible for between 2pc and 3pc of global carbon emissions. And Ms Thunberg continues to refuse to fly because of the impact on the environment.
“In 50 years, we will still be flying, and it will be sustainable,” says Palacios. “But we're in a fast-moving environment.” Until then, flight free activists will remain on the ground. “The only way to fly sustainably here and now is not to fly at all,” says Rosén.
U.S. law requires cruise ships to treat waste within about 3.5 miles of shore—but beyond that, there are no restrictions on dumping polluted sewage and graywater. Researchers have estimated that over a billion gallons of sludge made from excrement and food scraps are released into the ocean every year by cruise lines.
If you wonder whether cruise ships have jails, the answer is yes. Jails are called brigs on a cruise ship and tend only to be used in serious circumstances when no other options are available. Cabin arrest is typically used before the brig is needed.
Disney Cruise Lines has committed to becoming plastic free by 2025, both onboard and at Castaway Cay and Lighthouse Point. Shipboard recycling processes have helped to eliminate on average more than 2,500 tons of metals, glass, plastic and paper from traditional waste streams each year.
When there is no connection or ships cannot connect, they have to use fossil fuels to generate the electricity needed to power their onboard systems. This produces exhaust out of the ship's stack.