With many of the world’s cities combating drought, it is apparent that channeling water away from populated areas with no intended use is not sustainable. Cities are depending on their “precious rain water” more than ever and, as Arid Lands Institute co-founder Hadley Arnold says, "the ace in our species pocket is the ability to innovate.” We need to “build cities like sponges,” starting with permeable hardscape, drought-tolerant landscaping and smarter plumbing. See what NPR has to say about issue of water treatment and Los Angeles, here.