[1/7] Herbs and micro-greens grown at the underground farm in a disused World War Two bunker using hydroponic technology and LED lighting, powered by renewable energy, are pictured in London, Britain November 24, 2022. REUTERS/Maja SmiejkowskaLONDON, Nov 28 (Reuters) - In an underground World War Two air raid shelter where London tube trains can be heard rattling overhead, aromatic coriander leaves tilt towards the pink glow of LED bulbs - a vision of how farms could look in the future. Zero Carbon Farms grows herbs and salads in Clapham, south London, a densely populated area with no room for conventional agriculture. But 30 metres below ground there is a kilometre of tunnels, and technology has made farming here a reality. "What makes this industry so exciting and challenging is that no one's quite cracked it," said Zero Carbon Farm's business development director Olivia O'Brien.

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