Travel into the past to see how water may have driven our own evolution -- and created civilizations. But can the Earth's water supplies guarantee our future?

Travel into the past to see how water may have driven our own evolution -- and created civilizations. But can the Earth's water supplies guarantee our future?

Earth's changing water cycle -- and a globalized movement towards water for profit -- is forcing changes in humans' reliance on water. Can a geopolitical crisis be averted?

Earth's changing water cycle -- and a globalized movement towards water for profit -- is forcing changes in humans' reliance on water. Can a geopolitical crisis be averted?