Can we say something is sustainable if it cannot be many doing it? No, what is sustainable will work with everyone doing it. Living in cities is certainly not that. Wildlife is already drastically reduced, with environments being taken, and agriculture, mainly for the industries with animals being used, are the explanation. The real sustainable way, that all could do to continue on in this world, is with being independent from anything of the cities with growing all that can be grown where they are. Really all could be doing that, while some have to join with others for that. But such are the sustainable communities.
sustainabilitybynumbers.com/p/…
marinebiodiversity.ca/7-devast…