Wind power is a sustainable, renewable energy source, and has a much smaller impact on the environment than burning fossil fuels. Historically, wind power was used by sails, windmills and windpumps, but today it is mostly used to generate electricity. Today, wind power is generated almost. The Gansu Wind Farm in China is the largest wind farm in the world, with a target capacity of 20,000 MW by 2020. It involves using wind turbines to convert the turning motion of blades, pushed by moving air (kinetic energy) into electrical energy (electricity). Associate Professor of Engineering Systems and Atmospheric Chemistry, Engineering Systems Division and Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology.
