A note on cruise ships
Unfortunately, a cruise ship will raise your carbon footprint by roughly the same amount as covering the same distance by plane because such ships are heavy uses of fuel. Ferries are less fuel hungry, especially if you don’t stay on board overnight, or travel as far.
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). Passengers often also fly to board the ship.
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On a typical one-week voyage a cruise ship generates more than 50 tonnes of waste and a million tonnes of grey (waste) water, 210,000 gallons of sewage and 35,000 gallons of oil-contaminated water. Some of this is pumped into ocean and some treated.
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