[dunnevens]

It was also in Civ 1. Industries and nuclear war would create pollution on the map. Would appear as a black cloud over a tile. You could send out a settler unit to clean up the pollution but it was a slow process. If the map accumulated too much pollution, global warming would happen. A random plains tile would be changed to desert. Or a coastal tile would become a swamp.

It wasn't too difficult to stay ahead of the pollution curve in the late game as long as you didn't have a war. But there was one memorable game where I had a massive nuclear exchange with Gandhi. Created too much pollution. The world become a wasteland because I couldn't clean it up in time. And the AI didn't clean anything on its own, iirc. I won the game, but it was such a Pyrrhic victory.

This was probably 29 years ago. Playing obsessively on my old Mac LC. Still remember it because it was the saddest game session I've ever had. I won, but there wasn't much left at the end. Broken cities and the earth was dead.

https://civilization.fandom.com/wiki/Global_warming_(Civ1)

[Gravityloss]

Global warming was different from pollution. IIRC in Civ 1 global warming turned some coastal tiles into swamp.

Don't remember if there was nuclear winter as well.

[dr_dshiv]

Yes, it had nuclear winter.

Global warming resulted from not cleaning up pollution. Then the tiles would change irreversibly.