The rise in prices - 50 per cent in two weeks - threatens upheaval and has resulted in riots and soldiers overseeing supplies in some emerging countries in which the grain is a staple food.

• 在两周内就上涨了50%25的米价可能会引起社会动乱。在一些将大米当作主食的新兴国家已经出现了骚乱，政府开始派军队监控大米的供应。