<http://schema.org/about>
"What happens when the rivers that 80% of our planet's human population and countless species of animals rely upon, become sick beyond repair? And how, exactly, do we know when a river is suffering? A"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/natural-sciences/majority-of-worlds-rivers-in-a-state-of-crisis-but-solutions-can-be-cheap.html>