A third of big groundwater basins are in distress. Image: UC Irvine/NASA/JPL-Caltech.
A new study shows a third of the biggest aquifers in the world are being depleted as more water is being drawn, than is being replenished. The research from NASA satellites shows that 21 of the world's 37 largest aquifers are at risk of drying up.
Sasha Richey from NASA's Jet Propulsion Laboratory is one of the authors of the study, and she joins Kathryn Ryan.
Listen to our interview from last month with author Mark Hertsgaard on the drought gripping California, where there has been no significant rainfall in four years and underground reservoirs are being sucked dry.
