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From California’s Central Valley to the croplands of Iran, groundwater depletion has accelerated over the last four decades across the world’s arid food-producing regions. In many parts of the western United States, India, Chile, Spain, Mexico and other countries, groundwater levels have been rapidly declining as water is heavily pumped to irrigate farmlands, according to a new study analyzing measurements from 170,000 wells in more than 40 countries. The research, published in the journal Natur