<http://schema.org/about>
"Here are 7 before-and-after images of cities, as seen from space, showing the impact humans have had on the surrounding environment."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/wilderness-resources/photos/7-ways-humans-are-damaging-the-planet/mountaintop-removal>