Page last updated at 07:48 GMT, Monday, 8 February 2010

'Vertical farming' trial at UK zoo

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A British zoo is running a "vertical farming" trial, which could produce up to 20 times as many crops as conventional methods.

Renewable energy and recycled water means the system needs only 5% of the typical amount of water, while freeing up valuable land.

Louise Hubball reports.

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