Guardian Focus podcast: Food security

In this week's Focus podcast, we look at the issue of food security. In September, Mozambique erupted in a series of food riots, provoked by sudden hikes in the price of bread. At least 14 people died and hundreds were injured. In 2007-08, similar rises in the cost of staple foods triggered protests all around the world. This week, John Vidal reported that rising food prices and shortages could produce a further food crisis . Felicity Lawrence is joined by Oxfam GB's head of research , Duncan Green to discuss the issue. We hear from Jayati Ghosh , leading professor of economics at Jawaharlal Nehru University, in India; Raj Patel , award-winning author of The Value of Nothing , and a fellow at the Institute for Food and Development Policy , also known as Food First; and Olivier de Schutter , the UN's special rapporteur on the right to food . • Additional research by Claire Provost