Wind Power:
Wind is the movement of air from an area of high pressure to an area of low pressure. In fact, wind exists because the sun unevenly heats the surface of the Earth. As long as the sun shines, the wind will blow. And wind has long served as a power source to humans.
Ancient mariners used sails to capture the wind. Today, more and more wind turbines wring electricity from the breeze. Over the past decade, wind turbine use has increased more than 25 percent per year.