If you're doing it for environmental reasons, don't bother. Biofuel has extraordinarily low 'energy density' (ie - it takes a ton of land to harvest a little bit of energy when compared to traditional fossil fuels).
The degradation of farm lands is a global issue on the scale of climate change, but with more predictable results (ie - Iraq used to be a lush, tropical paradise, now it is a ball of dust).
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