The world could face a food crisis of the kind seen in 2007/08 if countries restrict exports on concerns about a drought-fuelled grain price rally, the UN's food agency warned according to the united nations' monthly food price index released thursday, the cost of food is surging around the world at six percent on average. Concern about extreme hot and dry weather in the US midwest sent corn and soybean prices to record highs last month, driving overall food prices higher again and reversing the food and agriculture organisation's forecast for declines this year. The united states produces more corn than any other country. Abundant supplies of rice and sluggish economic growth should also ease the upward pressure on prices, but a lot will depend on how the weather develops for US crops and how demand develops in coming months.