Agriculture has dominant part of world economy. Climate change has effects on rainfall pattern and weather change. Is climate change has some effects on agriculture?
Start by studying the Intergovernmental Panel on Climate Change (IPCC)'s Fifth Assessment Report (AR5), Working Group II on "Impacts, Adaptation, and Vulnerability", available here
http://www.ipcc.ch/report/ar5/wg2/
and in particular Chapter 7 on food security, downloadable from