His powerful reportage takes us to places where waterways are turning to sand before they reach the ocean; where fields are parched and crops no longer grow; where once fertile ground has turned to desert; where wars are fought over access to water and cultures are dying out.

But he offers us hope for the future - if we can radically revolutionise the way we treat water, and take personal responsibility for the water we use. This landmark work, from a respected and accomplished scientist, will transform the way we view the water in our reservoirs and rivers, and change the way we treat the water in our taps.