1. If you are a writer who has not grown up reading science and science fiction, you MUST give your manuscript to a science fiction writer for review prior to publication. This will save the would-be Eden-builder from making idiotic claims that industrialism will never re-emerge in the post-apocalyptic population of Ideal Beings because all the easy veins of iron ore have long since been tapped, then mentioning not ten minutes later the iron spikes of a fence that is part of the epic layer of iron-rich rubble that covers the entire surface of the Earth. The Stupid, it Hurts.
2. If you are doing the tired old "environmental collapse leads to societal collapse" thing, you must explain why human beings turn to animals in a way that we have never done in the presence of any other emergency, ever. Even the black death. If we were able to hold our shit in the face of the black death, you have to explain why we didn't when global warming hit the fan. I'm looking at you, too, Cormac McCarthy. I thought you were writing about nuclear winter. Ms. Atwood, I particularly need you to explain why all of your genius populations neither saw their fellow men as (a) human beings in need of compassion and help, nor (b) customers.
Final verdict: passion-free sociopaths are boring and poorly-executed apocalypses are frustrating.