What is the fate of the world if you keep playing?
I am talking about a scenario where you are actually winning and aren't at risk of being wiped out by another civilization. Obviously to keep on playing you must have won somehow, either due to some victory condition or being the biggest civ at the mandatory retirement year. The game let's you play on for a few turns after that stage. What happens if you keep playing? In a recent game I was able to wipe out the two remaining civs after I had already won the game. Since there were no other civs every turn was just new pollution appearing, cleaning pollution, cleaning up the remains of an ICBM blast, building pointless city improvements on cities that didn't actually need them, building roads and railroads on former ai civ's tiles, etc
One thing I noticed was that every turn a couple of tiles would start getting degraded, like tundra to grassland and grassland to desert. Is that the future of the planet if you keep playing? Will global warming turn the entire world into desert at some point? Or does something else happen if you wait long enough? Has anybody ever tried this out?