<http://schema.org/about>
"Take half a minute and watch this video from NASA's Goddard Institute for Space Studies showing how temperatures have changed from 1880 through 2011."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/climate-weather/blogs/watch-this-is-what-global-warming-looks-like>