Green Power supplements provided by you:
http://www.smartertechnology.com/c/a/Smarter-Strategies/Treated-Sewage-Could-Unlock-a-Wealth-of-Power/?kc=STNL08022010STR1
A similar idea robot powered by you:
http://www.treehugger.com/files/2010/08/self-sustaining-robot-powered-by-sewage.php
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