on Wikipedia it says "Sustainable architecture, it can be argued, does not rigorously form a part of architecture as a discipline[citation needed]. Rather, it is a concern in the building construction industry as a whole, and given the dominance of construction techniques and building subsystems, it should be considered a part of civil engineering as a discipline.[citation needed] There are also conflicting ethical and political orientations depending on the viewpoints.[20] Numerous schools of architecture exclude sustainable architecture as a part of their curriculum, and it is considered to be a fashionable subject at the moment[citation needed]." i dont understand what it means