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Stephen Sackur talks to newsmakers and personalities from across the globe. The world's commercial farmers face new challenges - while prices for their staple crops have risen dramatically, so too have their costs thanks to the soaring oil price, and they're under pressure to increase yields while reducing greenhouse gas emissions. Stephen Sackur meets Peter Kendall, President of the National Farmers' Union of England and Wales, and asks whether the world can feed itself in a sustainable way.