Cruise lines' pollution report cards

USA Today reports on an environmental group's cruise lines pollution report cards.

Friends of the Earth gave its highest mark — a "B"_ to Holland America Line (picture right).

Cruise lines were graded in three categories: sewage treatment, air pollution reduction and water quality compliance.

Disney Cruise Line was among the lowest "F-rated."

Read the full story: Some cruise lines found failing in pollution 'report' card

Photo by Andy Newman, Holland America Line, via Getty Images