The document discusses wind power and wind turbines. It provides an overview of the history of windmills, how wind turbines work to generate electricity, worldwide installed wind power capacity, largest onshore and offshore wind farms, environmental impacts of wind power, and developments in small-scale and innovative wind turbine designs. It notes that worldwide installed wind power capacity reached 197 gigawatts by the end of 2010, with several countries achieving relatively high levels of wind power production.