Ecological rationality is a concept important to most environmental and natural resources policy and to much policy-relevant literature and research. Yet ecological rationality as a distinctive form of reason can only be understood and appreciated in the context of a larger body of work on the general concept of rationality. In particular, Herbert Simon’s differentiation between substantive and proceduralrationality and Paul Diesing’s specification of forms of practical reason are useful tools in mapping and defining ecological rationality. The significance and characteristics (...) of ecological rationality suggest that it is a fundamental kind of reason, having precedence over others. (shrink)