<http://schema.org/about>
"The idea of a zoo using the waste of its own animals to generate electricity is not a new one: In the US the Rosamond Gifford Zoo in Syracuse, New York investigated using waste from its Asian elephant breeding program a few years"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/renewable-energy/poo-power-could-supply-all-of-toronto-zooatms-electricity-needs-and-then-some.html>