via mentalfloss.com
Ew it's gross, get away, blah blah. It's time to start taking poop seriously as a viable alternative energy source. As long as beings are, continue to eat, and don't ingest overly modified foods, this will work.
mental_floss Blog » 7 Creative Uses for Poop
I agree with the suggestion about finding uses and I'm not against reprocessing poop into gasses for energy, but I don't think that a neighborhood with poop pipes running down the street to a central processor is a pragmatic approach. That picture actually looks more like a compost heap and they appear to be harnessing the gasses created by the decomposition, ie: methane.