Urban rooftop farming favours local food production. Although rooftop
farming is perceived as a sustainable system, there is a lack of
quantitative studies. Researchers in a community
rooftop garden in Bologna, Italy, grew lettuce, tomato, chilli pepper, eggplant, melon and watermelon.
Data was analysed by life cycle assessment for environmental and
economic performance. Eggplants and tomatoes showed the best environmental
performances of about 74 g CO2 per kg. Eggplant production in soil was cheapest at 0.13 € per kg.