"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."
This runs for about 28 minutes, so have your popcorn ready.
Links:
[1] http://www.ted.com/talks/bill_gates.html