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Groundwater makes up about 20 percent of the world's fresh water supply. Find out how scientists are tracking the changing groundwater supplies around the world, and what it means for changes in global climate.
Dr. Watkins is the project scientist for the Gravity Recovery and Climate Experiment (GRACE mission), based at NASA's Jet Propulsion Laboratory in Pasadena, CA.
For more information, please visit ClimateCentral.org.
Discover other forms of climate change on GPB's How Do We Know Main Page.