Every sewage treatment plant and every animal farm and every landfill should have methane digesters and collectors! Not only would this gain a lot of lost energy, it would produce a lot of high quality fixed nitrogen fertilizer - which would then replace a lot (ALL?) of the chemical fertilizers that we currently make from natural gas.
Two problems solved with one solution. Actually at least THREE problems would be solved - the natural organic fertilizer would allow the soil to be built up, and we would then stop poisoning the groundwater and rivers - and the dead zones in the ocean could start to rebound.
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