<http://schema.org/about>
"Paris' recently ratified Biodiversity Plan includes a call to triple the number of rooftop gardens and green roofs in the next decade."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/urban-design/paris-plans-add-80000-square-yards-rooftop-gardens-2020.html>