And I don't mean seasick.

Everyone's claiming to be green these days, including cruise lines. The environmental group Friends of the Earth has taken a closer look, though, and gives middling to poor grades to some of the biggest names in the business, including Celebrity, Carnival and Royal Carribean International, which sail out of Baltimore.

Friends rates the cruise lines on whether their ships treat the sewage produced by their thousands of passengers - small floating cities, in effect - or simply dump raw or partially treated waste in open waters - which they're legally allowed to do.  It also scores them on air pollution, on compliance with water standards meant to protect Alaska's sensitive coast and on the accessibility of their environmental information.

Holland America, Norwegian and Princess rate B's.  At the bottom of the pack, with Fs, are Royal Carribean and Disney, whose ships are pictured above. 

Cruise Lines International Association, the Florida-based industry group, challenged the report card, calling it "arbitrary and flawed," according to this story in the Ft. Lauderdale Sun-Sentinel.  The industry said cruise lines "comply with and in most cases exceed applicable environmental regulations." 

To see the report card, go here. 

(Associated Press photo)