Guardian: Next stop for policymakers gathered in Rome for World Food Day should be Cancun, venue of the climate change summit Remember 2008? The prices of agricultural commodities doubling in a matter of months, food riots in about 30 developing countries, 150 million more people facing hunger. Two years later, as the committee for world food security holds its annual session in Rome and celebrates World Food Day, there is little to rejoice about. The stocks have been replenished, but no …