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......
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What’s Causing Extreme Weather?
Posted by National Geographic: Peter Miller on August 20th, 2012
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