<http://schema.org/url>
<http://www.treehugger.com/slideshows/environmental-policy/rio20s-culture-word-street-and-visual-messages-here-and-there/>
<http://www.treehugger.com/slideshows/environmental-policy/rio20s-culture-word-street-and-visual-messages-here-and-there/page/3/>