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California drought: Past dry periods have lasted more than 200 years, scientists say

Mercury: California's current drought is being billed as the driest period in the state's recorded rainfall history. But scientists who study the West's long-term climate patterns say the state has been parched for much longer stretches before that 163-year historical period began. And they worry that the "megadroughts" typical of California's earlier history could come again. Through studies of tree rings, sediment and other natural evidence, researchers have documented multiple droughts in California...