Global ocean study reveals unexpected plankton populations (2:37)

Sept. 26 - A research mission across the world's oceans has revealed that twice as many plankton types live in the sea than previously thought. The Tara schooner has been docked in London for ten days following its momentous two-and-a-half-year voyage across the Atlantic, Pacific, Antarctic and Indian Oceans to chart the impact of climate change. Jim Drury went aboard.