Bill Gates discusses energy innovation

I know this is not my typical post, but I greatly admire Bill Gates and his wife for their dedication and championing of causes to help make the world a better place.

The video is a bit long, but fascinating. Gates talks about his concern for global warming and its impact on the world (esp the poorest). What I found most interesting starts at the 8 minute mark where he identifies types of energy where he thinks innovation might take place to achieve significant carbon reduction, despite existing challenges.
Bill Gates on energy: Innovating to zero! | Video on TED.com