(Courtesy of Encore.org)
Winner: Sustainable Innovations Inc., Fairfax, Va.
Through his nonprofit Sustainable Innovations, Agrawal founded Aakash Ganga, or River from Sky, in 2003 in his native India to create a system for collecting rain—a precious source of drinking water. Now, gutters, pipes, and underground tanks gather the short-lived rains of monsoon season in six villages that are home to 10,000 people.
Next: Susan Burton, 61