As promised, I'm posting the three presentations by Drs. Ray Kurzweil, George Church and Saul Griffith from September 10 at MIT for you all to download. They're fascinating. Dr. Kurzweil talks about the progression of technology, and the possibilities that solar power holds. Dr. Church talks about energy from biological sources and Dr. Saul Griffith talks about a number or different possibilities.
Dr. Ray Kurzweil's Presentation
Dr. George Church's Presentation
Dr. Saul Griffith's Presentation