National Geographic: and 2011 that routed storms away from drought-prone parts of North America, and a massive high pressure system, known as a heat ridge, that parked itself over the U.S. this summer and refused to budge. But there's more to the story, said John Nielsen-Gammon, state climatologist in Texas, which just went through the worst one-year drought in its history. It wasn't just bad luck that caused these disasters, he explained. Human-induced global warming was also to blame. (Test your global warming...
URL: http://news.nationalgeographic.com/news/2012/08/120820-extreme-weather-heat-waves-science-environment-global-warming/
Enclosure: http://images.nationalgeographic.com/wpf/media-live/photos/000/475/cache/science-extreme-weather-haboob-dust-storm_47509_600x450.jpg
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