The other 2012 winners, who each receive $100,000, are:
Bhagwati (B.P.) Agrawal, 68, Sustainable Innovations Inc., Fairfax, Va.
By using his engineering expertise, Agrawal is mitigating the water shortage in his native India. Through his nonprofit, Sustainable Innovations, he founded Aakash Ganga, or River from Sky, in 2003 to create a system for collecting rain - one of precious few sources of drinking water. Now, gutters, pipes and underground tanks gather the short-lived rains of monsoon season in six villages, home to 10,000 people.