Among tenured economists who fancy themselves heterodox are a considerable number who might better be described as "oreodox". That is to say, they are hetero with regard to method but ortho to the core when it comes to the economic imperative of growth. Post-Keynesians, traditional Marxists, Institutionalists, Minskyites and what have you. Have they never heard of Herman Daly?
I understand the pressures of "fitting in" to the academy, where most colleagues are more concerned with climbing the career ladder (or at least not falling entirely off it) than with the "fate of the planet" or the unemployed. On the other hand, unemployment and/or environmental externalities are always good topics for a seminar, a journal article or an op-ed piece in the local paper. It would be a pity if they could be too easily banished, throwing scores of marginalized, oreodox economists out of a job.
Degrees of orthodoxy can best be gaged by the economist's position on unemployment.
Ultra-orthodox: there is no such thing as unemployment
Orthodox: there is unemployment; it is regrettable but unavoidable
Oreodox: there is unemployment but it can be eliminated by State policy
Reality: unemployment IS the State's policy