I would consult Paul P. Christensen's excellent work on the former  
question, such as, for instance:  
  
"Historical Roots for Ecological Economics--Biophysical versus  
Allocative Approaches," In: The development of ecological economics;  
85-104; Elgar Reference Collection. International Library of Critical  
Writings in Economics, vol. 75. Cheltenham, U.K. and Lyme, N.H.: Elgar;  
distributed by American International Distribution Corporation,  
Williston, Vt., 1997 [1989].  
  
  
"Driving Forces, Increasing Returns and Ecological Sustainability," In:  
Ecological economics: The science and management of sustainability;  
75-87; Technical editing by Lisa Wainger, New York: Columbia University  
Press, 1991.  
  
Mathew Forstater