This article says that cruise ships emit a lot of harmful emissions, but it doesn't mention the amount of fuel per passenger compared to other means of travel.
"...these giant floating playgrounds leave an enormous environmental impact...Friends of the Earth’s (FOE) report card, cruise line companies are mostly doing a poor job at reducing air and water pollution. Foe’s report card, the sixth from the US nonprofit, assigned 17 cruise lines and their 171 ships a grade between A and F in four categories: sewage treatment, water quality, air pollution reduction and transparency...FOE found much of its information for the report online, Keever said. The sources included contractors who have installed waste treatment technologies and air purifiers on the ships.
"...companies have made the biggest improvement in reducing their air pollution by using newer technology. They made that switch in response to a recent international regulation, which requires all ships sailing within 200 nautical miles of the US and Canada coastline to use cleaner fuel or install technology that reduces the sulfur content in emissions...
"...Many cruise lines are using outdated systems to filter their sewage, resulting in minimally treated sewage being dumped into the water..
"...these giant floating playgrounds leave an enormous environmental impact...Friends of the Earth’s (FOE) report card, cruise line companies are mostly doing a poor job at reducing air and water pollution. Foe’s report card, the sixth from the US nonprofit, assigned 17 cruise lines and their 171 ships a grade between A and F in four categories: sewage treatment, water quality, air pollution reduction and transparency...FOE found much of its information for the report online, Keever said. The sources included contractors who have installed waste treatment technologies and air purifiers on the ships.
"...companies have made the biggest improvement in reducing their air pollution by using newer technology. They made that switch in response to a recent international regulation, which requires all ships sailing within 200 nautical miles of the US and Canada coastline to use cleaner fuel or install technology that reduces the sulfur content in emissions...
"...Many cruise lines are using outdated systems to filter their sewage, resulting in minimally treated sewage being dumped into the water..
This article says that cruise ships are worse per passenger mile than long-haul flights.
""According to our calculations, a cruiseliner such as Queen Mary 2 emits 0.43kg of CO2 per passenger mile, compared with 0.257kg for a long-haul flight (even allowing for the further damage of emissions being produced in the upper atmosphere)."
"Quite aside from the carbon emissions, there is a high cost to the ocean. The cruise industry has a poor record in terms of waste water treatment and disposal...
"a rough initial calculation for the Queen Elizabeth II. Cunard says the ship burns 433 tonnes of fuel a day, and takes six days to travel from Southampton to New York. If the ship is full, every passenger with a return ticket consumes 2.9 tonnes. A tonne of shipping fuel contains 0.85 tonnes of carbon, which produces 3.1 tonnes of carbon dioxide when it is burnt. Every passenger is responsible for 9.1 tonnes of emissions. Travelling to New York and back on the QEII, in other words, uses almost 7.6 times as much carbon as making the same journey by plane.”
"Quite aside from the carbon emissions, there is a high cost to the ocean. The cruise industry has a poor record in terms of waste water treatment and disposal...
"a rough initial calculation for the Queen Elizabeth II. Cunard says the ship burns 433 tonnes of fuel a day, and takes six days to travel from Southampton to New York. If the ship is full, every passenger with a return ticket consumes 2.9 tonnes. A tonne of shipping fuel contains 0.85 tonnes of carbon, which produces 3.1 tonnes of carbon dioxide when it is burnt. Every passenger is responsible for 9.1 tonnes of emissions. Travelling to New York and back on the QEII, in other words, uses almost 7.6 times as much carbon as making the same journey by plane.”
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