<http://schema.org/about>
"Heat waves clearly can destroy crop harvests. The world saw high heat decimate Russian wheat in 2010. Crop ecologists have found that each 1-degree-Celsius rise in temperature above the optimum"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/rising-temperatures-melting-away-global-food-security.html>