That's where cow manure comes in.
Various laboratories are studying the potential of certain microbes to run fuel cells using such raw material as sewage. The Ohio State team takes its inspiration from one of nature's most efficient microbial processing systems - the main stomach of a cow. Microbes in a cow's rumen fluid release electrons as they break down cellulose in the cow's feed. The team has used this fermenting fluid as the source of electrons for a fuel cell's electric current."Is this BS? Well, yes and....