Cruise ships generate a number of waste streams that can result in discharges to the marine
environment, including sewage, graywater, hazardous wastes, oily bilge water, ballast water, and
solid waste. They also emit air pollutants to the air and water. The environmental costs of the sector
are incalculable given that the cruise ship industry is unregulated and difficult to gauge widely its
impacts, despite enforcing environmental standards for the industry. This is an example of the large