https://www.youtube.com/watch?v=veg7Y6FCPAI

its so cool, just check the artworks of this planet

a single city covering the entire planet ''Ecumenopolis''

its also like cyberpunk style but not boring like that

roughly around 3 Trillion Population.

It manages its own climate. At low altitudes, the air is very bad near the ground. It's impossible to even get fresh air. As you can see in the movie, there are very rich people.

When we think about it, humanity and our cities,countries and our whole economy become laughable

---Now it's time to go to space and do space mining and fusion. We are really busy with wars and other useless things in the world.