The optimal scale of the economy is smaller, the greater (a) the degree of complementarity between natural and man-made capital; (b) our desire for direct experience of nature; and (c) our estimate of both the intrinsic and instrumental value of other species. The smaller the optimal scale of the economy, the sooner its physical growth becomes uneconomic.

Ecological Economics and the Ecology of Economics: Essays. 1999, p. 20.