Researchers from UCLA and the University of Houston have been tracking changes in the groundwater table that runs below California’s San Joaquin Central Valley. The study directed by UCLA’s Department of Geography Dennis Lettenmaier shows how between 2002 and 2016 there was a significant loss of groundwater from what is considered one of the largest agricultural hubs in the United States, as it provides more than half of the country’s fruit, vegetable and nut supply.