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The thing is this is in no way better for the environment. Think of the amount of grain we would have to raise, the amount of fertile land we'd have to give over to horse paddocks. Going backwards is not the answer, more fuel efficient technology is.
And it's not so much that manure is bad for the environment is that it's bad to have around where humans like to eat and drink. Manure is full of bacteria that can contaminate water that causes serious illness and even death.
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