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Biosphere 2: Building A New World
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An ambitious ecological experiment was launched in Arizona in September 1991. It aimed to see if human beings could produce everything they needed to survive - in a man-made environment. Rachael Gillman has been speaking to Linda Leigh, one of the eight scientists who spent two years sealed inside the giant greenhouse known as 'Biosphere 2'.
Photo credit: TIM ROBERTS/AFP/Getty Images
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