<http://schema.org/about>
"It takes a lot of phosphorus to support our diet-about 222.5kg per person per year for a normal balanced diet. Professor Stuart White, Director, Institute for Sustainable Futures, University of Technology, Sydney suggests that it follows the same"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/green-food/are-we-near-peak-phosphorus.html>