By Sarah Young and Aiden Nulty LONDON (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. Seven years after its first harvest, the company will soon double its growing space, ...
