Civilization II

-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.

-As a result, big cities are a thing of the distant past. Roughly 90% of the worlds population (at it's peak 2000 years ago) has died either from nuclear annihilation or famine caused by the global warming that has left absolutely zero arable land to farm. Engineers (late game worker units) are always busy continuously building roads so that new armies can reach the front lines. Roads that are destroyed the very next turn when the enemy goes. So there isn't any time to clear swamps or clean up the nuclear fallout.

-Only 3 super massive nations are left. The Celts (me), The Vikings, And the Americans. Between the three of us, we have conquered all the other nations that have ever existed and assimilated them into our respective empires.

I've been playing the same game of Civilization II for almost 10 years. This is the result.