The pedestrian-powered Human Water Pump concept

According to research from the Pacific Institute, more than five million people die each year from water-related disease, primarily due to inadequate access to clean water which, if it is available, often requires trekking over long distances to reach it. Gunwook Nam from South Korea has proposed a solution that harnesses people power - literally. The Human Pump concept uses a boardwalk structure fitted with springs that captures and stores kinetic energy from foot-traffic and uses it to pump underground water to the surface.

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