Beijing has started work on 33 windmills to supply clean energy in time for the 2008 Olympic Games. Reuters reports the $76 million power stations, situated on the outskirts of Beijing, are expected to produce an estimated 100 million kilowatts of electricity a year to reduce the city’s reliance on polluting coal-fired generators. The windmill project, which China claims to be the 10th largest in the world, would also cut carbon dioxide emissions by at least 10 million tons a year. . . So, how to harness the muscle power of those athletes with their Olympic-sized carbon footprints? JULIA WHITTY