Wind is caused by known physical processes occurring within the Earth’s atmosphere. The Sun heats the Earth’s surface unevenly, and the air above hot land rises and is replaced by air from cooler regions. These bulk movements of air result in winds. Man has sought to harness the power of wind for thousands of years, first by utilizing sails to power ships, and then from about the 7th century, by dedicated machinery — windmills. Now, as we prepare to leave the first decade of the 21st century, with diminishing fossil fuel reserves and increasing pressure worldwide for greater use of cleaner, renewable energy production, man once more has turned his attention to harnessing the power of wind by using wind turbines. More »
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wind turbine,
wind's energy