So much of literary sci-fi is about creating worlds that are rich and detailed and make sense at a social level. We'll create a world for people and then later present a narrative in that world.
If we do not voluntarily bring population growth under control in the next one or two decades, the nature will do it for us in the most brutal way, whether we like it or not.
If I had to give a definition of capitalism I would say: the process whereby American girls turn into American women.

