Gravity Light: Our Renewable Energy Future — Watts Up With That?

Guest essay by Eric Worrall What could be better for providing light in a poor country with no electricity than a cheap kerosene lamp? A group of renewable entrepreneurs think they have found the answer – meet Gravity Light, a third world LED lighting system powered by lifting a bag containing 12Kg (27lb) of rocks […]

via Gravity Light: Our Renewable Energy Future — Watts Up With That?

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