Recently there have been food shortages in a number of countries. What are the causes and the solutions?

Diversion of resources to production of biofuels has frequently been cited, as has increased consumption of meat in China and the drought in southern Australia with replacement of rice growing by wine gs as a crop, see a href="http://www.nytimes.com/2008/04/17/business/worldbusiness/17warm.html" rel="nofollow"http://www.nytimes.com/2008/04/17/busine…/a Are there additional causes, and what are effective solutions which stand some chance of being adopted by international organizations or individual countries? Include any ideas you may have about effective advocacy of your proposed solutions.