The article cited in the post above begins with a vignette of a family in China that separates its waste for use on the fields. It reminded me of one of the best examples of property rights I've ever seen.
This photo (which I took in Zhaoxing -- southern China -- in 1998) shows how each family "makes deposits" using their own outhouses. The waste is then collected from below and applied to their fields as fertilizer. Individual outhouses avoid conflicts over possession of the valuable (!) shit. (They also indicate that pollution from sewage is unlikely to be a problem!)
Bottom Line: One man's shit may also be his treasure.