More than twenty million people go on cruises each year. Cruise ships burn heavy oil full of pollutants, which are emitted unfiltered into the atmosphere. It does not have to be this way. If the vessels burned diesel instead, the emissions would be significantly reduced, though the fuel costs would rise.

More Global 3000: http://www.dw.de/global-3000-the-globalization-program-2013-05-20/e-16787905-9798