<http://schema.org/about>
"From Genghis Khan's reforestation to King Edward I's 14th century ban of coal mining, these famous people were dedicated to TreeHugger ethics --- even if they didn't know it."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/slideshows/culture/10-historical-figures-you-had-no-idea-were-environmentalists/page/3/>