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Wind turbines spin at the Helanshan site in Ningxia province. The wall in the foreground is part of the Great Wall of China. This wind power facility is central China is set to become China's 3rd largest wind farm. 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.