“Economist Herman E. Daly cautions that we are facing a historic juncture in which, for the first time, the limits to increased prosperity are not the lack of manmade capital but the lack of natural capital. The limits to increased fish harvests are not boats, but productive fisheries; the limits to irrigation are not pumps or electricity, but viable aquifers; the limits to pulp and lumber production are not sawmills, but plentiful forests. ”