Giant cruise ship heads to Arctic

It is a voyage explorers only dreamed of not so long ago. But thanks to climate change, a luxury cruise ship has undertaken a pioneering journey that will see it sail through the once impassable Northwest Passage during a monthlong trip that is drawing much excitement but also criticism from environmentalists. The Crystal Serenity, which set off from Seward, Alaska, on Aug 16 with nearly 1,000 passengers, is scheduled to dock in New York on Sept 17.