<http://schema.org/about>
"It seems obvious that amphibians, with their permeable skin and proclivity for aquatic environments, would be among the first to be effected by chemical pollution and environmental degradation. Indeed, they have long been"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/amphibians-dethroned-as-environmental-canaries.html>