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koheripbal
5y ago
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Even sewage, which is less complex, only makes sense in dense areas. Many homes have septic tanks.
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jjeaff
5y ago
Which is why we have sewage systems in dense areas and septic systems in rural areas.
barumi
5y ago
> Even sewage, which is less complex, only makes sense in dense areas.
That's ok, as over half of all mankind lives in dense urban centers.
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