According to the International Energy Agency, revolutionizing the energy industry to achieve a GHG target concentration in the atmosphere of no more than 450 parts per million (ppm) would require building 17 nuclear power plants a year between now and 2030; 17,000 wind turbines a year; or two hydropower dams on the scale of Three Gorges Dam in China. Major investments in new electricity generation from renewable resources are required. Fatih Birol, IEA Chief Economist, said: “For every $100 that goes into electricity, $72 must go into renewables, in which wind plays the most important role”.