At TED2010, Bill Gates unveils his vision for the world's energy future, describing the need for "miracles" to avoid planetary catastrophe and explaining why he's backing a dramatically different type of nuclear reactor. The necessary goal? Zero carbon emissions globally by 2050. (Recorded at TED2010, February 2010 in Long Beach, CA. Duration: 27:49)

Sharing powerful stories from his anti-obesity project in Huntington, W. Va., TED Prize winner Jamie Oliver makes the case for an all-out assault on our ignorance of food.

Jamie Oliver was awarded $100,000 and the opportunity to present his vision to the world as part of his TED prize. A celebrity chef and nutrition advocate, we imagine that part of that vision includes better eating — and living.