¥From 1950-1990, average grain yields
rose 2.2% per year; but from 1990-2010,
they rose just 1.2% annually
¥Wheat
yields are plateauing in France, Germany, the United Kingdom, and Egypt, all important producers
¥JapanÕs rice yields, close to 5 tons per hectare, have been flat for over a decade;
those in China may also plateau
as they approach the Japanese level
