A construction worker pauses for a break at the Guanting Wind Farm in Beijing, China. The Guanting wind power field project is Beijing's first large-scale use of wind power, and it is just one of the projects that will be used to fulfill the City's Olympic promise of a Green Olympics. China, home to 16 of the worlds 20 most polluted cities, is beginning an aggressive initiative to pursue renewable energy. Its held that China has the most wind power potential of any country in the world, taking into account its inland and offshore sites. By 2020 China is expecting to produce 10% of its energy from renewables: namely wind, solar energy, hydroelectric dams and biowastes.