<http://schema.org/about>
"It's not just tree rings, ice cores and satellite data that can provide a record of how the planet's climate has changed over the years, decades and centuries... The notes of American writer and"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/henry-david-thoreau-as-climatologist-scientists-use-field-notes-taken-in-1851-to-track-plant-species-loss.html>