<http://schema.org/about>
"In Mexico, methane from landfills, a natural byproduct of decomposing organic matter known as landfill gas, or LFG, makes up 10 percent of  all greenhouse gas emissions. Beginning in 2001, Monterrey, Mexico\u2014a modern city of nearly four million people"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/cars/monterrey-mexico-taps-methane-to-power-its-metro-system.html>