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Hall’s research interests are in the field of Systems ecology with strong interests in biophysical economics, and the relation of energy to society. His work has involved streams, estuaries and tropical forests but focused increasingly on human-dominated ecosystems in the US and Latin America. His research reflects his interest in understanding and developing analyses and computer simulation models of the complex systems of nature and humans and their interactions. Halls focus has been on energy as it relates to economics and environment. His focus is studying material and energy flows referred to as Industrial ecology, and applying this perspective, to attempting to understand human economies from a biophysical rather than just social perspective. (Source: http://en.wikipedia.org/wiki/Charles_A_S_Hall)
Hall, and other biophysical economic thinkers are trained in ecology and evolutionary biology, fields that break down the natural world as done also by physicists. These views hold the global economy in a different perspective that mainstream economists do not share. Central to Halls argument is an understanding that the survival of all living creatures is limited by the concept of energy return on investment (EROEI): that any living thing or living societies can survive only so long as they are capable of getting more net energy from any activity than they expend during the performance of that activity. (Source: http://en.wikipedia.org/wiki/Charles_A_S_Hall)