In the long run, biomass seems like the most promising alternative to oil. But we're a LONG way from producing fuel from biomass that would rival what we're getting from oil today. If we have to go that way, then better figure on riding your bicycle to work. You won't be able to afford the fuel to drive your car.
Well, I don't know how much Engineering YOU have, but I'm a Mechanical Engineer, and I just happen to know a little bit about engines. There are many on the horizon that could be pretty happy running on soybeans. All we have to have is a reason to develop them, which, like I said, we don't have right now.
Retrofit my Monte Carlo SS with one of those, and I'm good to go.