<http://schema.org/about>
"Cities can be hot-spots of pollution, with thousands or millions of people, cars, pets, industries, and more contributing to global warming. But they can also be centers of innovation, as bright ideas, available funding, and"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/7-cities-with-great-green-projects-others-should-imitate.html>