The presence of biophysical limits to economic growth from the perspective of ecological economics is understood through the following three salient features:

- The scale effect (i.e., the sheer size of the human economy relative to the natural ecosystems).

- The complementarity of "human-made" and "natural" capital.

- The special feature given to energy resources.

Explain how the above three features are used both independently and in combination to advance the ecological economists' perspective of biophysical limits to economic growth.