Earth Keepers profiles India’s Ashok Khosla, head of Development Alternatives, which is putting development back in the hands of local populations; Canadian John Todd and his “living machines,” which mimic nature for waste water reclamation; Sweden’s Karl-Henrich Robèrt, developer of the Natural Step method for managing municipalities and large corporations, based on a vision of the future; and Kenya’s Wangari Maathai, whose Green Belt Movement has seen millions of trees planted by women who are taking the future of their country into their own hands.