Why do we use cow manure in so many things but other animals’ poop (i.e. cats and dogs) are considered to be toxic?
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Before we had indoor plumbing, and chemical fertilizers you used to be able to sell your own poop to night soil men.
The poop was processed in a way that made it safe to use as fertilizer for crops. If you were rich and ate a lot of meat, you could sell your poop for more as meat poop has more nitrogen.
If the infrastructure still existed to compost human poop, you would also still be able to sell your pets poop. Right now, chemical fertilizer is cheap enough that there is no market for collecting poop from a dispersed group of omnivores and obligate carnivores.
Cows, pigs and chickens on the other hand live in massive farms where waste disposal is the business owner’s responsibility and the density of factory farms make it possible to produce a product that is cheap enough to compete with chemical fertilizers.
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