Is the world’s fresh water supply running out?

Aired: 6/17/2015 | 0:04:54 | Clip
Recent studies have found that humans are using up water at a faster rate than it is being replenished. Judy Woodruff talks to James S. Famiglietti, a professor of Earth System Science and Civil and Environmental Engineering at the University of California, Irvine, about what this dwindling supply of freshwater means, and whether we should be concerned about it.