Here at the Financial Permaculture course, the local biofuels expert is discussing with a packed sunday school room of local residents the possibilities for farm based or small scale cooperative ethanol production. He is highlighting the re-use of the by products. For instance feeding livestock the distillers grains, using their manure in a methane digester, the resulting by product as fertilizer, closing the loop. You can pump the carbon dioxide into greenhouse to boast plant growth and kill pests, or grow algae for feed, or fertilizer.

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