Population collapse.
Westworld Season 3, Episode 8
if only
half the POPULATION is fighting.
Game of Thrones Season 7, Episode 1
...based on the number of mailboxes and
given typical urban POPULATION density...
The Big Bang Theory Season 2, Episode 15
The POPULATION of King's Landing.
Game of Thrones Season 3, Episode 7
...which is roughly the POPULATION
of the Southwest...
Breaking Bad Season 5, Episode 8