A fresh look at the world's water crises, and the existing and emerging solutions that can be used to solve them. It is not your imagination: water crises are more frequent. Our twentieth-century systems for providing the water that grows food, sus...

Turn on the tap, and water pours out. Pull out the plug, and the dirty water disappears. Most of us give little thought to the hidden systems that bring us water and take it away when we're done with it. But these underappreciated marvels of engineer...