The received understanding of interdisciplinarity in environmental higher education depends on constructions of the environmental agenda which tacitly privilege positivistic assumptions associated with the physical and biological sciences. If, however, we take seriously the heuristic force of the key humanities disciplines in regard to our environmental situation, precisely this privileging will be at issue. This suggests that collaboration across the full range of intellectual disciplines is needed not just to solve but to frame environmental problems. This requirement, however, may have to be met at the institutional level rather than at that of individual teachers and learners.