<http://schema.org/about>
"Duncan Graham-Rowe of the Guardian looks at the issue of vertical farms and finds that it grows on him. He calls it a \"beguilingly simple idea: make maximum use of a small amount of space by filling glass houses with"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/green-food/fix-our-horizontal-farms-before-we-go-vertical.html>