If you're interested, Stuart Brand released a book in 2009 that he calls an "eco-pragmatist manifesto". ( http://www.amazon.com/Whole-Earth-Discipline-Ecopragmatist-M...) the thrust of it is that it's too late to save the earth from humanity; its time to focus on saving humanity from the earth. He comes out in favor of cities, nuclear power, and GM foods in great detail, with enough footnotes to keep you busy for weeks. Interesting and entertaining read... And loaded with tidbits you can throw at your less savvy friends at dinner parties.