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PEW Commision

A single ifap housing 5,000 pigs produces the same volume of raw sewage as a town of 20,000, but the ifap facility does not have a sewage treatment plant.
Meat on the table

A synopsis of the report and link to the main study: Meat on the table

Quotes: 
A single ifap housing 5,000 pigs produces the same volume of raw sewage as a town of 20,000, but the ifap facility does not have a sewage treatment plant.