Photos: Low-cost tech that meets basic needs

Human-powered pumps like this one enable people to retrieve water from 7 meters deep. Pressure treadle pumps can divert water up a hill or into tanks above ground, ideal for farming. Costing between $12 to $80, these pumps marketed by IDE are used in Malawi, Zambia, Ethiopia, India, Cambodia, Nepal, Myanmar and Bangladesh.

Photo by International Development Enterprises