"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.
Andrew C. Revkin posts an exchange between Vaclav Smil, the University of Manitoba analyst, and Lester Brown, president of the Earth Policy Institute in the New York Times Dot Earth blog. Posted January 10, 2011.