Wind is considered one of the cleanest means of harnessing energy. Unlike traditional power sources, wind energy is free of pollutants such as particulates, methane, mercury, sulfur dioxide and nitrogen oxides. No fuel is required, billions of gallons of water are not consumed during operation, and minimal amounts of waste are produced. As the worldwide demand for sustainable energy grows, thousands of wind turbines are being installed each year.
It is unfortunate then that wind power has its own dark side: thousands of birds and bats are killed annually by wind turbines.