Stat: 844 million. The amount of people worldwide who lack even a basic drinking-water service, according to the World Health Organization.

Story: For many of us, it can be easy to take water for granted. Turn on the tap and it's there. But today, the world faces a tipping point, with water security—having sufficient access to safe water for our daily lives—at risk. Listen in as our guest, Sandra Postel, discusses the challenges and shares options for fixing our broken water cycle.