This paper we introduced a schematic describing the relationship between the natural and the economic systems. One side depicted the flow of mass and energy to the economic system, while the other depicted the flow of waste products back to the environment. We examine how a balance can be achieved in the reverse flow of waste products back to the environment. Because the waste flows are inexorably intertwined with the flow of mass and energy into the economy, establishing a balance for waste flows will have feedback effects on the input flows as well.