A new study by the CGIAR Consortium’s Climate Change, Agriculture and Food Security (CCAFS) estimates that the global production of wheat, rice and maize could decrease by 13 to 20 percent in the coming decades because of climate change – even as production needs to rise by 70 percent to feed the 9 billion people by 2050. To do that, CGIAR scientists suggest that farmers may have to cultivate crops that are more drought and heat tolerant, like millet, sorghum and barley.

http://www.icrisat.org/Climate-Conversations.htm