Food routinely travels across the planet by train, plane and ship, but are all these 'food miles' necessary? Urban farms could put a substantial amount of fresh produce on our tables without the long journeys.
Nowadays it's no surprise to find Californian lettuce in a New York grocer or New Zealand onions in a German supermarket.
A massive logistical operation swings into action every day in industrial societies, just to supply cities with food. Yet some say cities could be doing a lot more to feed themselves.
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