20 decks, 40 restaurants, and a waterfall

Bloomberg on the cruise ship question:

When Royal Caribbean’s Icon of the Seas embarks on its first official voyage on Jan. 27, the journey is sure to make waves. The world’s largest cruise ship, the Icon is over 1,000 feet long (360 meters) and weighs in around 250,000 gross registered tons. It boasts 20 different decks; 40 restaurants, bars and lounges; seven pools; six waterslides and a 55-foot waterfall. Royal Caribbean says its boat will usher in “a new era of vacations.”

Maybe so. But the Icon is also a doubling down on a negative aspect of cruising’s current era: greenhouse gas emissions.

In 2022, Bryan Comer, director of the Marine Program at the International Council on Clean Transportation examined the carbon footprint of cruising as compared to a hotel stay plus air travel — since cruises are effectively floating hotels. His analysis found that a person taking a US cruise for 1,200 miles (2,000 kilometers) on the most efficient cruise line would be responsible for roughly 1,100 pounds (500 kilograms) of CO2, compared with 518 pounds (235 kilograms) for a round-trip flight and a stay in a four-star hotel. In other words: Taking a cruise generates “about double the amount of total greenhouse gas emissions” as flying, Comer says.

Also, Bloomberg goes on to say, people usually fly to get to the cruise ship.

People are also going on cruises in bigger numbers than ever.

Cruise ships’ climate impact isn’t limited to emissions that trap heat in the atmosphere. The enormous vessels also spew a soot-like substance known as black carbon, which absorbs sunlight and traps heat on the ground. In the Arctic, which is playing host to a growing number of cruises, black carbon can settle on snow and ice, speeding up the rate at which glaciers melt. Bartolini Cavicchi says that while cruise ships account for around 1% of the global fleet, they’re responsible for 6% of black carbon emissions.

Well maybe once Alaska is covered in soot people won’t want to take cruises there any more.

Just kidding. By that time people will be killing each other for a loaf of bread.

But liquid natural gas! Better!

LNG-powered ships do emit 25% less CO2 than those running on conventional marine fuels, but one 2023 investigation by environmental activists found that cruise ships running on LNG often leak some of it directly into the atmosphere as methane, a greenhouse gas that in the short term is 80 times more potent than carbon dioxide. For three out of four engine types, the investigation determined that LNG was worse for the climate in the short term than conventional fuels.

Ok ok ok but long term it will be great. Somehow.

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