We have all heard of peak oil, but peak grains? A study released by the Institute of Agriculture and Natural Resources at the University of Nebraska-Lincoln suggests we may be heading in that direction — if we’re not already there. The UNL study indicates that about 30% of major global cereal crops — including rice, wheat and corn — may have already reached their maximum yields. In fact, yields of these crops seem to have already hit a plateau and some are already decreasing, especially in eastern Asia, Europe and the United States. “We found widespread deceleration in the relative rate of increase of average yields of the major cereal crops during the 1990-2010 period in countries with greatest production of these crops,” says an article based on the study in Nature Communications . The article notes that there was a noticeable plateau […]