Scientists Use Recycled Sewage Water to Grow 500-Acre Forest in the Desert
A lot of people eat food grown with recycled sewage and don't even know it.<p>Every excretion flushed in the city of Chicago ends up as fertilizer on midwest farms.  Mostly soybeans, IIRC.<p>A lot of zoos sell their surplus animal dung in big bags called "zoo poo."  It's used in home gardens and small scale community farms.