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Marie Ndieguene, a young Senegalese civil engineer, is tackling post-harvest loss for farmers with a novel storage solution. This allows crops to last longer and attract higher prices, and reduces waste. Her solution, made from old car tyres and plastic bottles, is sustainably made from diverted landfill waste. Marie's idea has won her a nomination for the Africa Engineering Prize. "For food efficiency, we don't need to produce more - we need to conserve more." Photo: Marie Ndieguene Credit: RAEng/GGImages/InaMakosi