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This photo provided by the University of Maryland shows Brooke Czwartacki taking a measurement in a well in Awendaw, South Carolina. Czwartacki regularly checks the salinity of well water as saltwater invades the state’s aquifers. (Hunter Musi/Stanford University via AP)

This photo provided by the University of Maryland shows Brooke Czwartacki taking a measurement in a well in Awendaw, South Carolina. Czwartacki regularly checks the salinity of well water as saltwater invades the state’s aquifers. (Hunter Musi/Stanford University via AP)

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