Dirty, Sacred Rivers explores South Asia's increasingly urgent water crisis, taking readers on a journey through North India, Nepal and Bangladesh, from the Himalaya to the Bay of Bengal. The book shows how rivers, traditionally revered by the people of the Indian subcontinent, have in recent decades deteriorated dramatically due to economic progress and gross mismanagement. Dams and ill-advised embankments strangle the Ganges and its sacred tributaries. Rivers have become sewage channels for a burgeoning population.

To tell the story of this enormous river basin, environmental...