<http://schema.org/about>
"Go chop down a tree. Really, we mean it. An artificial Christmas tree might seem like the greener option, since no real tree is being destroyed and it can be reused year after year. But they\u2019re usually made of PVC, and our local recycling center"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/how-to-pick-a-green-christmas-tree.html>