When it comes to the environment and sustainability, cruise ships and many cruise ship operators get failing grades when it comes to controlling carbon emissions, recycling, and treating water, waste, and sewage.

But thanks to new technology and the scrutiny of passengers, government agencies, and environmental groups, the tide is beginning to turn.

Norwegian cruise operator Hurtigruten just launched the world's first hybrid electric-powered expedition ship, the 530-passenger MS Roald Amundsen. The vessel is named for the Norwegian explorer who was the first person to navigate the Northwest Passage by boat and the first person to cross Antarctica and reach the South Pole.