Rooftop to Tabletop: Urban Farming Spreads Roots

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    Rooftop farming is expanding. City dwellers have been growing food on rooftops for decades, either to fulfill a craving for the cuisine of their homeland, or for the simple love of gardening. But in recent years, efforts to turn rooftops into growing space have become larger and more ambitious — more the province of farmers than of gardeners. Spurred by consumer demand for fresh, local produce, and aided by new technology, entrepreneurs across the country are leasing rooftop space for commercial agricultural operations in the heart of bustling cities.