It must be twenty years now since Lester Brown wrote "Who will feed China?" but many of his predictions have proven unfounded. Basically, his case was that with diminishing water tables, increasing soil erosion, conversion of arable land into suburban sprawls, rising populations and double digit economic growth allied with an increasing 'meatification' of the diet of the new middle class, that these trends would all contribute to a massive shortfall in grain supplies. But China was a net...