In recent years we have witnessed extraordinary and extreme weather events that have impacted grain production in key agricultural areas. (sciencedaily.com)
It is only within the last 60 years or so that rising yields have replaced area expansion as the principal source of growth in world grain production. (treehugger.com)
Feed grains have risen from around 30 percent of total global grain production to around 40 percent today. (scientificamerican.com)