Finally, Bretschger (2010) proposes “sustainability economics” in a neoclassical conception. He defines sustainability as “long-run development which is characterized by non-decreasing living standards, a protection of crucial natural resources, and low risks of economics and
ecological crises” (p. 187). What exactly sustainability economics is,remains unclear in this article. The employed model in the paper, however, is based on resource economics and growth theory, i.e. the standard economists' tools within a neoclassical framework.