Biodeisel makes sense, but the best plant for the process is verboten. Henry Ford had plans to go this route in the late 20's.
Could that verboten plant be HEMP?
You can also make gasoline, lubricating oil, cooking oil, food products, plastic, synthetic and natural fibers, etc (nothing wasted). China grows lots of this plant, and sells lots of it's resulting product on the international markets; they don't seem to understand how dangerous it is.