T. Boone Pickens  made his fortune in the oil business, but the 83-year-old recently shifted his focus to America’s energy future, and how  to reduce U.S. dependence on foreign oil. During this week’s TED Full Spectrum Conference, Pickens is speaking about the future of energy. In the second part of his interview, Pickens  discusses natural gas and the controversial practice of fracking  with fellow presenter John Hockenberry.