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According to a study in the journal Nature Climate Change released Monday, the American West’s megadrought deepened so much last year it is now the driest in at least 1,200 years. The study’s lead author Park Williams, a climate hydrologist at UCLA, studied soil moisture levels in the West, including the southwest corner of Montana, using modern measurements and tree rings for estimates that go back to the year 800. The study calculated 42% of this megadrought can be attributed to human-caused climate change.
