Ships and trains are the most fuel efficient ways to transport things - and things include people. In terms of the bad PR, I confess I'm biased - I'm an epidem

Ships and trains are the most fuel efficient ways to transport things - and things include people. In terms of the bad PR, I confess I'm biased - I'm an epidemiologist, with a fondness for GI infections, so norovirus is near and dear to my heart. But cruises have good marketing, the failures like that are relatively rare on a mass scale, and it's a cheap vacation that feels like luxury to people.