Rising energy and transportation costs are one reason there's been upward pressure on food prices. And increasing concern over “food miles” — a measure of a product's impact on the environment, taking into account how far it must travel from production to retail — is helping to drive the growth of the local foods movement. So, why not grow fruits and vegetables as close to the supermarket as possible — say, on the roof? That was the question asked and answered by Keith Agoada and Troy ...

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