renewable energy
renewable energy (alternative energy) Energy from a source that can be replenished or that replenishes itself, and is more environmentally safe than traditional energy forms such as coal, gas, or nuclear energy. Solar energy harnesses the rays of the Sun. Tidal power stations use the gravitational force of the Sun and Moon on the ocean. Wave power harnesses the natural movement of the sea. The power of rivers and lakes can be tapped by damming the flow and using turbines to generate hydroelectricity. Wind power schemes have existed for centuries in the form of windmills. Another, less well-known, renewable source is the geothermal energy produced in the Earth's crust.
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renewable energy
