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Energy has been harnessed from the wind for thousands of years, and while high-tech solutions inform current versions of wind power, a simple, natural material is lending itself to optimal turbine blade design: wood. This natural, renewable fibre-reinforced composite offers superior fatigue and strength-to-cost properties. In the U.K., wind turbine blades constructed of Finnish birch have experienced 20 years of problem-free service; sustainable bamboo is being pressed into blade service in China. Savonius turbines with bamboo-bladed rotors show slightly lower rotational speeds than with metal blades but incur lower manufacturing and life-cycle assessment costs. Can natural materials make other inroads in renewable energy system design?
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