CARE Electric: Hydropower Without Dams

Lifelong inventor Johann Hoffmann has devised a way to harness river power to generate electricity without building expensive, environmentally destructive dams

Johann Hoffmann started patenting inventions to protect the environment while still a young boy in his native Austria. His first—created when he was just 14—was a buoy system to contain oil spills in the ocean, a system that's still being used today. Hoffman's work eventually led him to Brazil, where among other things, he developed a method to clean up mercury contamination from gold mining in the Amazon River.

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