World's largest cruise ship takes to the seas amid controversy

Royal Caribbean International's newest addition to its fleet, the Icon of the Seas, began its maiden voyage from Miami over the weekend. The ship, which measures more than 350 metres long and can carry up to 7,600 passengers, is crewed by more than 2,000 people. But environmental groups are concerned that the vessel, which is built to run on liquefied natural gas, will leak harmful methane into the atmosphere.