<http://schema.org/alternativeHeadline>
"Floods, droughts and heat waves hit the world last year as greenhouse gas levels climbed, boosting the odds of extreme weather events."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/climate-weather/stories/climate-scientists-saw-year-of-extremes-in-2011>