Are you concerned about food prices? It has been a hot topic for the past 2 years.
Some say that natural disasters (and maybe climate change) and the diversion of crops to make biofuel have caused food shortages, while others say that it's commodity speculation (finger pointing at Goldman Sachs - yup, one of the big ones that tipped things over in 2008). But what's scarey is that the food prices were one of the causes for the chaos & upheavals in North Africa, and land buying (I'm thinking of China). What may be just a 50 cents increase in my loaf of bread may amount to half of a person's daily salary being wiped out for the same purchase in a developing nation.
Josh Weinstein does a great job of explaining the commodity speculation.
Foreign Policy - has an article by Lester Brown