Bio-Diesel questions...

So Bio-Diesel and other organic, non-fossil, fuel sources have been getting alot of press lately (http://www.forbes.com/work/feeds/ap/2006/04/19/ap2681244.html). Which is fine, because at least they are renewable, as opposed to their closely related cousins: fossil fuels such as petroleum. But I guess my issue is this: world population is rising still. Food supplies, while currently sufficient, are going to be spread continually thinner over the coming decades. If we are trying to make bio-fuels a realistic alternative, then that would be a huge portion of food matter that would be diverted away from food production into the fuel production. So it would seem to me that this solution is, at best, a temporary or interim solution, which we can use as a stepping stone to fully electrical or hydrogen-driven transportation economy. The reality is that we only have a finite amount of organic matter available for food production, and we are finding it harder and harder to embrace new areas for that, why paint ourselves into a corner with further drain on these organic food/energy sources when we have plentiful power available in the realm of nuclear, hydroelectric, wind, etc?

Although I am kind of amused by the idea of feeding my car old corn-husks to fuel its fun...