A $150,000 prize has been awarded to the “Water Gandhi of India” for his wildly successful work that turns abandoned, impoverished “dust bowls” into lush villages bustling with life again using an ancient method of rainwater harvesting. For teaching thousands of villagers in India’s most arid region how to build earthen dams to catch the monsoon rains and revitalize their land, Rajendra Singh was honored Friday with the 2015 Stockholm Water Prize. 30 years ago, Singh went to the poverty-stricken state of Rajasthan with the aim of setting up health clinics. He was told by villagers, however, that their greatest...