Weird take. Sure, you could try to re-build what you had before the apocalypse. Or you could build a new world that <i>isn't</i> the one that just plunged everything into chaos. If our technology wasn't so good, the world wouldn't be as populated, we wouldn't need so many resources, there wouldn't be so many ways to poison the earth, and the earth would be habitable and sustainable for millennia.<p>After the apocalypse, I want the people who can dig wells, practice permaculture, organize a farm, keep sheep, spin yarn, blacksmith, prep lumber, fire pottery and glass, tan leather, hunt, fish, manage woodlands. Doctors and scientists would be handy too, but now that we know so much about how biology works it wouldn't be so difficult to keep people living longer. Assuming antibiotics still work in 20 years and we retain some basic surgical skills, we're basically set.<p>The most challenging thing after an apocalypse is obviously going to be government. If there's no law and order you can't really organize anything. Whoever has the most power, best strategizing, and most flexible morals will collect the most resources and gather the largest forces. It'll be "join or die", and slavery will come back. Just read your history to see what happens when societies crumble.