Climate change: how a warming world is a threat to our food supplies
When the Tunisian street vendor, Mohamed Bouazizi, set himself on fire on 17 December 2010, it was in protest at heavy-handed treatment and harassment in the province where he lived. But a host of new studies suggest that a major factor in the subsequent uprisings, which became known as the Arab spring, was food insecurity.
http://www.theguardian.com/environment/2013/apr/13/climate-change-threat-food-supplies

Climate Change, Agriculture and Food Security (CC BY-NC-SA 2.0)