<http://schema.org/about>
"While some folks may be busy debating whether soil-less agriculture can be organic or not, there's a lot of momentum behind aquaponics. As the name suggests, aquaponics is a system of food cultivation"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/renewable-energy/can-biogas-make-aquaponics-even-more-efficient.html>