<http://schema.org/description>
"Green labels abound for seafood, coffee, fair-trade, organic products and more, but we have yet to come across one unifying label that allows us to compare apples to oranges in terms of sustainability. Now it looks like Wal-Mart, may be changing that with"^^<http://www.w3.org/2001/XMLSchema#string>
<http://inhabitat.com/is-it-green-wal-marts-sustainability-index/>