"Post-late" Civilization

Here's a guy who's played the computer game Civilization II for 10 years:

There are 3 remaining super nations in the year 3991 A.D, each competing for the scant resources left on the planet after dozens of nuclear wars have rendered vast swaths of the world uninhabitable wastelands. […]

The ice caps have melted over 20 times (somehow) due primarily to the many nuclear wars. As a result, every inch of land in the world that isn't a mountain is inundated swamp land, useless to farming. Most of which is irradiated anyway. […]

The only governments left are two theocracies and myself, a communist state. I wanted to stay a democracy, but the Senate would always over-rule me when I wanted to declare war before the Vikings did. […] Anyway, I was forced to do away with democracy roughly a thousand years ago because it was endangering my empire.

Aren't we using simulations in many areas of science that are less sophisticated than Civ II?