Well, here's the real kicker...we probably should have made a much stronger push for alternatives 10-20 years ago. Why? The design, development, construction, transportation and overall implementation of alternative forms of energy requires massive amounts of oil. It would have saved extraordinary amounts of money had we started all of this when oil was real cheap. Now oil is getting so expensive, it's more difficult to start a large-scale shift to alternative forms of energy.
I've always believed ethanol is a joke, probably 90% of my posts here on APC have centered around oil, so one can reference past posts when it comes to this. I do, however, feel that there is some real promise w/ Wind and Solar...they obviously won't come anywhere near replacing fossil fuels, but there is some potential.
These aren't my ideas, I'm basically a talking parrot as they say, I'm repeating many of the things I've heard from one of my favorite geologists, T. Boone Pickens. Watch the link, it's educational and entertaining, the guy is 80 years old and going strong...gotta admire him for that.
http://www.youtube.com/watch?v=jngHfYFs9L8