Environment: The Last Drops

Population growth and development have depleted and polluted the world's water supply, raising the risk of starvation, epidemics and even wars

Swaminathan Asokan dreams of water. It gushes out of a giant tap and fills bucket after bucket. But then he wakes up -- to a nightmare. For at Asokan's house in Madras, India's fourth largest city, there is no water. The tap has long been dry. So he must get up in the dark of night and, laden with plastic pails, take a five-minute walk down the street to a public tap. Since the water flows only between 4 a.m. and 6 a.m., Asokan, 34, a white-collar worker at a finance company, tries to be there by 3:30 a.m. to get...