Couldn't we try to collect cow poop in a major tank for every area and leverage the methane?
Furthermore we could collect all biological waste in another big tank and if we add "thermotoga neapolitana" bacteria in that tank, we can get hydrogen out of it.
If we combine oxygen, hydrogen and methane, we can produce methanol.
The profits generated from the methanol can be used to invest in this tanks and poop infrastructures that would be needed in the first place. Why methanol ? About the methanol economy: http://www.technologyreview.com/biztech/wtr_16466,296,p1.html
Apart from that, we really need a new poop infrastructure anyway for at least 2.6 billion people that dont have access to a clean toilet infrastructure.
The Bill and Melinda Gates foundation try to tackle that:
http://goo.gl/S3CtJ
