CHRIS KNAPTON / SCIENCE PHOTO LIBRARY CHRIS KNAPTON / SCIENCE PHOTO LIBRARY
Wind farm turbines are used to generate electricity from wind. They are an important environmentally-friendly alternative to fossil fuel. The blades have to turn to face directly into the wind, and each turbine positioned away from the others' air flow to work efficiently. The sheep grazing at lower left indicate how large wind turbine farms have a smaller impact on the environment than a power station.
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