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Western US entering worst drought in 1,200 years, study says
The study from Columbia University used tree ring data and climate models. The information let them measure moisture changes dating back to a big drought in the late 800s.
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The study from Columbia University used tree ring data and climate models. The information let them measure moisture changes dating back to a big drought in the late 800s.
Web Editor : Jason O. BoydPosted 2020-04-18T23:19:00-0400 - Updated 2020-04-18T23:48:58-0400