the 100 is so funny, like
okay the apocalypse occurred, bombs were dropped everywhere, people flew to space, and then they came back thinking earth would be uninhabitable still (it would* be), but found out it was habitable, things apparently evolved pretty insanely in 100 years, and a lot of extremely complex societal changes for survivors on the ground occurred.
a LOT of this shit simply could not have happened in such a short timespan, they all talk about things like it was actually 400 years or something