<http://schema.org/about>
"How many billboards did you pass today? If you can even keep count, you're lucky. Most of those are made with vinyl. And most of them get thrown away. Over 3 million a year in the US alone. That's nearly 10,000 tons, or to give you"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-product-design/how-to-turn-unrecyclable-waste-into-an-asset.html>