<http://schema.org/about>
"Wherever people gather en masse, so does their trash. Even large-scale events with good environmental intentions can leave a heap of rubbish in their wake. To s"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/wilderness-resources/photos/10-events-that-need-their-own-landfills/nascar-events>