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Megadrought: American West's dry spell worsens to levels not seen in over a millennia
Nature Climate Change.The study calculated that 42% of this megadrought can be attributed to human-caused climate change."Climate change is changing the baseline conditions toward a drier, gradually drier state in the West and that means the worst-case scenario keeps getting worse," said study lead author Park Williams, a climate hydrologist at UCLA. "This is right in line with what people were thinking of in the 1900s as a worst-case scenario.