Sustainable vegetable production of rooftops in Paris

Picture copyright Dorr et al.

Urban rooftop farming is gaining popularity in European cities, although its impacts have rarely been quantified. Scientists Dorr et al. used Life Cycle Assessment to compare the environmental and economic impacts of producing 1 kg of lettuce or tomato under various substrate types in a rooftop garden in Paris, France. High-yielding lettuce plants had lower impacts than tomato, and systems using compost as a substrate had lower impacts than those using potting soil.

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