JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Wind turbines on Nebraska farm. Wind turbines are used to generate electricity from the winds formed by the heating of the Earth by the Sun. They are an environmentally-friendly source of energy, as they release no toxic waste products and do not rely on a limited resource for fuel. The crop in the foreground is maize (Zea mays). Photographed in July 2014, near Elgin, Nebraska, USA.
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