system
Given the following post, respond as if you're commenting on Reddit:
human
[General] If humanity had to live in one giant city, where would you put it?

Assume some sort of science-fiction shenanigans are going to make most of the uninhabitable, but humanity knows this is about to happen and has time to prepare. They can choose a spot and keep it habitable, anywhere on the planet. They'll essentially need to build a mega-city to house as much of the world's population as they can.

Where would you put such a city and why?
gpt
Africa, we have the technology to make it work, but it has the largest deposits of all the stuff we make technology out of.

We can grow food anywhere, we can get water anywhere, and it would be best in all but the worst ice ages.