Abstract
The theory and practice of ecological reason have consistently suffered various shortcomings, versions of anthropocentrism and holism prominent among them. Even definitions of ecological reason that rely on philosophically informed policy studies and that explicitly take the functional and substantive moments of reason into account have not escaped these problems. An account of interdisciplinarity can shed light on how these intractable problems arise, since many of them fail to build interdisciplinarity as such sufficiently into the definition of ecological reason. Genuine interdisciplinarity, distinguished from both multidisciplinarity and metadisciplinarity, can thus be seen to be necessary (not sufficient) to liberate ecological reason and to illuminate its theory and practice for late moderns.