"Attention has focused on oil insecurity, and rightly so, but it is not the same as food insecurity. An empty gas tank is one thing, an empty stomach another. And while there are substitutes for oil, there are none for food." –Lester R. Brown, Plan B 4.0: Mobilizing to Save Civilization.
Geoffrey Lean's article 'One poor harvest away from chaos' in the The Telegraph cites Lester Brown: "the world is only one poor harvest away from chaos. We are so close to the edge that politically destabilising food prices could come at any time." Posted January 12, 2011.