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Is manure even being used as fertilizer by the farmers whose cows produce it?
And, even if we do put this in place, I'm sure there's enough cows between dairy, meat, and leather so that some manure can be used for fertilizer and the other for biogas... though is the argument of the article that manure as fertilizer is bad for the Earth, or is it just that if it's left to decompose in fields that it's bad..?