A string of devastating natural disasters many are attributing to climate change has sent food prices on a roller coaster ride, leading to fears of a wave of climate-induced food price shocks of the sort that sparked rioting in the developing world two years ago.(..)Yesterday, the United Nations' Office for the Coordination of Humanitarian Affairs (OCHA) launched an appeal for $460 million in international aid to help address the problem. As part of that package, the World Food Programme is calling on $163 million in food aid for hard hit areas of Pakistan.