"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.
Watch Lester Brown's presentation at the NYT Energy for Tomorrow Conference from April 11, 2012. His panel is the Opening Plenary. Other notable speakers include Thomas Friedman, Steven Cho, Daniel Yergin, and T. Boone Pickins.