The best crop for an alternative fuel has already been identified - switchgrass. Pres. Bush was ridiculed for including it in his SOTU address, but he is right. It traps the maximum amount of CO2 below ground, provides far more energy than corn above ground, and is environmentally friendly and costs less to grow. The only reason we don't use it now is corn subsidies have provided an over-capacity for corn (and an over-incentive to grow it).
And as far as I know, smoking it doesn't turn you into a lazy moron.
Called my cousin, a long time rope burner, he said he get back with me in a couple of weeks. Next time I see him he'll say he hasn't talked to me in months.