<http://schema.org/about>
"In Heat: How to Stop the Planet from Burning, British environmental activist and writer George Monbiot identifies cement production as major source of greenhouse gas emissions. While most people are focused on reducing emissions from cars and buildings,"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/natural-sciences/could-nanoengineering-create-lower-emissions-from-cement-production.html>