Tom Strang, Carnival Corp’s senior vice president of maritime affairs, says while no available single technology can solve greenhouse gas emissions, the cruise giant’s investment in seven LNG-fuelled newbuildings took it a long way towards fulfilling its emissions-reduction ambitions.

“Simply put, it [LNG] has the best emissions profile of any fossil fuels,” Strang says. "The investment we make on an annual basis into R&D [research and development] and new technology is significant.”