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Hydro-power leaves behind no waste. and does not produce any greenhouse gases or pollution

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Hydro-electricity is considered a renewable source of energy but the buildings needed to make it have negative effects on the environment.

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Tidal power is another form of hydro-power.

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The largest hydroelectric power station in the world is the Three Gorges Dam in China.

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http://www.sciencekids.co.nz/sciencefacts/energy/hydropower.html

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In 2006, hydroelectricity was responsible for around 20% of the world’s electricity

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A hydraulic turbine turns the energy of flowing water into mechanical energy. A hydroelectric generator converts this mechanical energy into electricity.
http://water.usgs.gov/edu/hyhowworks.html