I admit to being quite ignorant when it comes to alternative fuels, however, I casually heard that one of the problems with biofuels is the sheer amount of biological material to produce the needed amount of biofuel. Something like 10 acres of corn = 1 gallon of usable biofuels.

I scoffed at that, because I realized that people wouldn't be looking at biofuel as a legitimate alternative if it was so inefficient to produce.