The marine transport sector contributes significantly to air and water pollution, particularly in coastal areas. In the oceans, the threat to marine life comes in various forms, such as overexploitation and harvesting, dumping of waste, pollution, alien species, land reclamation, dredging, and global climate change. A congressional research report indicates that cruise ships carrying several thousand passengers and crew have been compared to "floating cities," and the volume of wastes that they produce is comparably large, consisting of sewage; wastewater from sinks, showers, and galleys (gray water); hazardous wastes; solid waste; oily bilge water; ballast water; and air pollution. In this article, the author describes activities that are easy to correlate with technological literacy standards created by the International Technology Education Association. The author stresses the importance of promoting the manufacturing of Green Ships that don't pollute the environment and strengthen the laws that prohibit waste dumping so oceans stay clean and healthy; otherwise, the direct output of this concept--the existence of humanity in the years to come--will be questionable. (Contains 3 photos and 2 tables.)