<http://schema.org/about>
"Twenty years ago Linfen, China was invaded by coal mines and factories and degenerated from a center of fruit and flower farming to a twisted and polluted waste"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/energy/blogs/the-most-polluted-city-in-the-world-linfen-china>