Well if current farming practices rely heavily on petrochemicals for fertilizer, pesticides, and weed control and oil is a finite resource, then development of sustainable farming practices makes sense.
"Sustainable" means nothing more than the central control of resources. The soviet union ran on such an organization. "Sustainable development" was created by Gro Harlem Brundtland, head of the World Socialist Party, in her Brundtland commission, and was adopted as policy by the UN. It came to the United States through Bush Sr and Bill Clinton. No free people should ever consider that sustainable development or sustainable farming has any legitimacy in a free world.