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Charlotte Smith discusses global food security with a panel of experts as the Universal Expo - or World's Fair - comes to a close in Milan. The event's themes were 'feeding the planet, energy for life'. On the panel are Patrick Holden, founding director of the Sustainable Food Trust; Andrew Burgess of the giant vegetable growers Produce World; and Mark Lynas, co-author of the Eco Modernists' Manifesto.
During the programme we hear reports from the Expo - including how an algae could replace meat protein, and why farmers in Holland are producing insects as human food.
The producer in Bristol is Sally Challoner.