The economy is a wholly owned subsidiary of the environment, not the reverse. - Herman Daly

The notion of a steady state has meant different things at different times in history. To the traditional or classical economist, the steady state takes the biophysical dimensions of the planet — including population and available resources — as given and adapts technology and tastes to these objective conditions.

Economic logic requires that we maximize the productivity of the limiting factor in the short run, and invest in increasing its supply in the long run. When the limiting factor changes, then behavior that used to be economic becomes uneconomic. Economic logic remains the same, but the pattern of scarcity in the world changes, with the result that behavior must change if it is to remain economic. Instead of maximizing returns to and investing in man-made capital (as was appropriate in an empty world), we must now maximize returns to and invest in natural capital (as is appropriate in a full world). This is not “new economics,” but new behavior consistent with “old economics” in a world with a new pattern of scarcity.

Organisms cannot survive in a medium consisting of their own final outputs. Neither can economies.