In an exclusive Fresh Dialogues interview, Robert Ballard, Ocean scientist of Titanic fame, discusses global warming. "It's too late...all the ice is going to melt," says Ballard. Yet he says we should still reduce our carbon footprint and limit population growth. Natural cycle or Human impact? "It's both," says Ballard. "Whenever you have a tremendous controversy both sides tend to be right and wrong. You do have the natural interglacial warming that were experiencing, but you are increasing the severity of it with the human footprint."