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If we make methane from sewage or farm waste (plant and animal) in anaerobic digesters, after the methane comes out, the remaining slurry is a fixed nitrogen fertilizer.
Think about that for a second.
We get pure methane from a renewable source, and we get a high quality natural fertilizer. So, instead of an energy sink that kills off the life in the soil, we get energy out that we can use AND we get living constantly improving soil.
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