The world's first offshore wind farm

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Witness History talks to Danish inventor and wind energy pioneer, Henrik Stiesdal, who oversaw the construction of the world's first offshore wind farm back in 1991. Built off the coast of Denmark, it became a reference for offshore wind farms around the world, continuing to generate electricity until 2017. Louise Hidalgo asks Henrik Stiesdal about his work, which has helped to make Denmark a world leader in wind energy, and about building his first wind turbine at the age of 19. Picture: A wind farm off the coast of Denmark (credit: Getty Images)