"Cruising pumps about $16 million into state and local tax coffers annually and $1.7 million into the Seattle economy every time a ship docks there. But those benefits come at a cost. The very attractions that draw tourists to Alaska-bound ships, such as pristine sanctuary waters, marine wildlife and mountainous seascapes, can be harmed by pollution from cruise ships.
In a single day, the federal Environmental Protection Agency estimates, passengers aboard a typical cruise ship will generate:
• 21,000 gallons of sewage
• One ton of garbage
• 170,000 gallons of wastewater from sinks, showers and laundry
• More than 25 pounds of batteries, fluorescent lights, medical wastes and expired chemicals
• Up to 6,400 gallons of oily bilge water from engines
• Four plastic bottles per passenger – about 8,500 bottles per day for the Carnival Spirit. "