non-polluting energy source

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Scope note
Energy that is ecologically safe and renewable. The most widely used source is hydroelectric power, which currently supplies some 6.6% of the world's energy needs. Other non-polluting sources are solar energy, tidal energy, wave energy and wind energy. Most non-polluting energy sources require a high capital investment but have low running costs.
non-polluting energy source
Accepted term: 14-May-2014