The story of water is fascinating, complex, with roots as deep as civilization. Despite its profound, life-giving role in our planet's history, what we hear about it today is mostly bad news: The world's supply is severely at risk. We're reminded of this daily, with word of another drought, or alarming statistics about pollution, population growth, and climate changes, which together threaten to make water, even more than oil, the cause of war within our life time. Why have we allowed something so elemental to our existence to drift into such a precarious state? And what can we do to change the course we're on?