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What types of alternative energy systems have humans been using for hundreds of years?

April 26, 2017alternative energy humans hundreds SYSTEMS types

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What types of alternative energy systems have humans been using for hundreds of years?

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Some types of alternative energy systems that humans have been using for hundreds of years include Geothermal energy is the natural energy formed by the earth. The hot rocks that are under the ground heat water to produce steam. Also solar energy.