Just a few facts on ship polloution.
In my day 1970s our ships had sewage treatment systems better than my own home installation today (but similar design and operation). The International Maritime Organisation (IMO) has a department MARPOL (maritime Pollution) with lots of regulations in law. Considering UK water boards are dumping raw sewage in the sea and rivers, ships are bound by law to prevent pollution.
With regard to power alongside a berth, the following.
"CLIA's 39 member cruise lines have also agreed to build ships engineered to connect to shoreside power by 2035.
The importance of shoreside plug-ins
On average, each ship that plugs in at a port can reduce diesel emissions by 80% and carbon dioxide emissions by 66%, according to the Port of Seattle, which is trying to phase seaport-related emissions by 2050. According to the port, connecting a ship to shore power eliminates the equivalent emissions to driving an average car from Seattle to New York 30 times.
When shore power is not available, those lines have agreed that their ships will use other available low-carbon technologies required by ports.
CLIA told me that today, 93% of ship capacity on order among members is expected to include shoreside electricity; 40% of cruise ships now in service have that capacity.
The number of cruise ports equipped to provide that shoreside electricity sits at 22 worldwide, which is less than 2% of cruise ports. Half of those ports are in North America, with many along the West Coast as far north as Juneau, Alaska, and as far south as Los Angeles.
Other ports with shore power include six locations in Europe, including Bergen, Norway, and Southampton, England, and another five in Asia like in Incheon, South Korea, and Shanghai."
It would seem that there is a lot of catch up to be done. It is not always the fault of ships.
Diesel generators are again by law, run on low sulphur fuels when in dock as well as at sea. LOx and NOx are regulated.
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