Estimating the amount of seasonal snow is important for understanding the water cycle and Earth’s climate system, but establishing a clear and coherent picture of change has proven difficult.

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A new study by researchers at Duke University and RTI International finds that reusing oilfield water that’s been mixed with surface water to irrigate farms in the Cawelo Water District of California’s Kern County does not pose major health risks, as some opponents of the practice have feared.

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