http://www.time.com/time/world/article/0%%2C8599%%2C1717572%%2C00.html

"Soaring prices of staples -- which have risen about 75%% since 2005,
driven by growing demand, rising oil prices and the effects of global
warming -- have sparked riots in several countries, as people reel from
sticker shock and governments scramble to feed their people. Crowds
tore through three cities in the West African nation of Burkina Faso
late last week, burning government buildings and looting stores; when
officials tried to talk peace with one group of protesters, the
enraged crowd hurled stones at them. The riots followed similar
violent protests over food prices in Senegal and Mauritania earlier
this year. And, last October, protesters in India burned hundreds of
food-ration stores after stockpiles emptied, leaving thousands of
people unfed."