Post Carbon Institute - Spring 2009 The American food system rests on an unstable foundation of massive fossil fuel inputs. It must be reinvented in the face of declining fuel stocks. The new food system will use less energy, and the energy it uses will come from renewable sources. We can begin the transition to the new system immediately through a process of planned, graduated, rapid change. The unplanned alternative-reconstruction from scratch after collapse-would be chaotic and tragic.