For me, I think we need them all--- ethanol, biodiesel, hydrogen, wind, tidal turbine, nuclear, all of them. If we were spending 10 billion a month on energy independence rather than war, we could have a nice, functioning civilisation to leave to our kids. Hell, if we could come up with a better energy storage system, we could supply the world with energy at a large profit. Maybe even have a middle class to speak of.