Cruise Ships add to Global Warming at an Alarming Rate and may Destroy some of their exotic destinations

Riding on a cruise ship is the opposite of car pooling and could triple each humans effect on global warming. It may be like having one person drive three cars to work instead of having three persons drive one car to work. A recent New York Times article states:
Environmental groups say that a single ship, docked for one day, emits as much exhaust as 10,000 cars, maybe more.
Most cruise ships average two to three thousand passengers.
www.nytimes.com
By JAKE MOONEY
Published: March 5, 2009
RESIDENTS of Red Hook, Brooklyn, who worry about car exhaust have long looked in consternation to the east, to the Brooklyn-Queens Expressway, or, more recently, to the south, where an Ikea store opened last year amid fears about the traffic it would draw. But when Adam Armstrong of Pioneer Street thinks of exhaust, he thinks of the westward view from his backyard, toward the water. That is where, on certain days, Mr. Armstrong can see the smokestacks of the Queen Mary 2 and other cruise ships rising over the rooftops. When the ships are docked at Pier 12, the terminal at the foot of Pioneer Street, they are essentially idling, using their diesel engines to keep their electrical systems running.
What results, Mr. Armstrong said the other day, is a noxious smoke that wafts over the surrounding area. Environmental groups say that a single ship, docked for one day, emits as much exhaust as 10,000 cars, maybe more...According to the Port Authority’s numbers, based on 48 dockings each year, cold ironing would prevent 95 tons of nitrogen oxides, 6.5 tons of particulate matter (tiny particles suspended in a gas), 1,487 tons of carbon dioxide and 99 tons of sulfur dioxide from being released into the air.