<http://schema.org/about>
"There are lots of things that go into making a city more environmentally friendly--from sufficient density, to adequate public transportation, to superior walkability, to good green spaces--but a key part of all that is"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/corporate-responsibility/from-austin-to-santa-cruz-nrdcs-rates-the-uss-smarter-cities-for-energy.html>