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Recent images of a cruise ship limping back to port after an engine malfunction didn't do the cruise industry any favors heading into the summer vacation season. And cringe-worthy accounts from passengers who had to make do without power or working toilets for five days may have turned some travelers off cruising for good.

Australian billionaire Clive Palmer has unveiled his blueprints for Titanic II, a replica of the ill-fated cruise ship that succumbed to an iceberg in 1912 and, in the wake of that tragedy, became an object of fascination for generations.

Friends of the Earth , a global network of activists from 76 different countries, has come out with its annual cruise ship score card that evaluates cruise lines based on three environmental factors – sewage treatment, air pollution reduction and water quality compliance.

Disney Cruise Line came away with top honors, an A minus, scoring high in all three areas.

Here's a look at how the cruise lines fared in each category:

Top three for sewage treatment:
Disney Cruise Line
Norwegian Cruise Lines
Celebrity Cruises

Bottom three for sewage treatment:
Carnival Cruise Lines
Silversea Cruises
Costa Cruises

Top three for air pollution reduction:
Princess Cruises
Disney Cruise Line
Holland America Line

Bottom three for air pollution reduction:
Silversea Cruises
Costa Cruises
Crystal Cruises

Top three for water quality compliance:
Silversea Cruises
Norwegian Cruise Line
Regent Seven Seas Cruises

Bottom two for water quality compliance:
Carnival Cruise Lines
Holland America Line

Click here for more complete details of the Cruise Ship Report Card.

[Photo Credit- Flickr user NOAA's National Ocean Service]