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Experimental rooftop garden, Paris, France. This garden is on the roof of AgroParisTech, the Paris Institute of Technology for Life, Food and Environmental Sciences. The test area covers 600 square metres and is intended to test methods of sustainable farming in cities. The project is also part of INRA, the French National Institute for Agricultural Research. Photographed in October 2012. (KEYSTONE/SCIENCE PHOTO LIBRARY/ELISABETH SCHNEIDER/LOOK AT SCIENCES/SCIENCE PHOTO LIBRARY)