Biophysical economics is a system of economic analysis that acknowledges that nature is the basis for nearly all wealth. It views most human economic activity as a means to increase (directly or indirectly) the exploitation of nature to generate more wealth. Given your recent work with economics, and our discussion of sustainability and natural capital, what is your reaction to this approach. Feel free to use material from the paper and the EROI website, from which these ideas were drawn, to develop your response. See http://web.mac.com/biophysicalecon/iWeb/Site/Welcome.html.