The world’s largest cruise ship, Icon of the Seas, will embark on its first week-long cruise to the Caribbean at the end of January this year. It is exceptionally luxurious and offers its passengers a number of on-board attractions, including a huge entertainment and relaxation area. Such a colossus raises concerns about its environmental impact, but the builders ensure that it is the most environmentally friendly cruise ship. Is this true? Is there data available on the carbon footprint of this giant? So far, huge cruise ships are using more and more energy-intensive facilities, and greenhouse gas emissions are increasing.