I found this link and thought I should share it, even though it is slightly dated. An excerpt from the declaration:
We, the undersigned, believe that a healthy food system is necessary to meet the urgent challenges of our time. Behind us stands a half-century of industrial food production, underwritten by cheap fossil fuels, abundant and and water resources, and a drive to maximize the global harvest of cheap calories. Ahead lie rising energy and food costs, a changing climate, declining water supplies, a growing population, and the paradox of widespread hunger and obesity.
The declaration itself is a creation of Roots of Change, a sustainable agriculture organization. Their primary goal is to have a completely sustainable food system in the state of California by 2030. Their focus on California is primarily due to the abundance of agriculture for which that state is responsible – nearly a third of the food in the US comes from that state. More information about Roots of Change can be found here.