California's troubled waters: Satellite-based findings reveal major groundwater loss in Central Valley

New space observations reveal that since October 2003, the aquifers for California's primary agricultural region - the Central Valley - and its major mountain water source - the Sierra Nevada - have lost nearly enough water combined to fill Lake Mead, America's largest reservoir. The findings, based on satellite data, reflect California's extended drought and increased pumping of groundwater for human uses such as irrigation.

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