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That is actually not true, sewage can be treated and processed into 'biosolids'. I remember seeing a documentary about this, where they produced fertilizer from sewage in nyc

http://www.nyc.gov/html/dep/html/wastewater/biohome.shtml




Ya, milorganite exists, and has for like 100+ years, and I am sure there are others, but the total impact I am betting, is very minimal.


So it can; the question is, whether it is, and at what scale.


Human waste has been used as fertilizer for ages. Check out night soil




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