<http://schema.org/about>
"We are always a bit wary of the term \"environmental refugee\" because people's reasons for leaving their homes are often very complex and the amount of scientific research on the topic is still quite minimal. But there is a growing chorus, especially"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/corporate-responsibility/expert-warns-of-growing-wave-of-mexican-environmental-refugees.html>