NASA’s Gravity Recovery and Climate Experiment (GRACE) satellite mission is providing new, space-based insights into the global nature of groundwater depletion. The ongoing California drought is evident in these maps of dry season (September–November) total water storage anomalies (in mm equivalent water height; anomalies with respect to 2005–2010) in the western United States. Image from J. S. Famiglietti, The Global Groundwater Crisis, Nature Climate Change, November,, 2014
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