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Renewable?
If you mean you can grow crops year after year and get fuel from it then sure...but we are already at a point where the nitrogen we use for fertilizers is destroying the waterways - has already turned large parts of the gulf into dead zones where there is not enough oxygen in the water to sustain life.
Ultimately its a not-so-cheap fix that does more harm than good while pretending to be a "green alternative" to fossil fuels.
The ultimate answer is simple - STOP BURNING STUFF. =-)
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