A world in chaos, ruined by the climate and the following rebellions and raids. People joined together in so-called Mega-cities, enormous conglomerations, each with their own distinct vision.
There are currently 4 of these Mega-cities known, at least in what used to be Western Europe, what is now called Europea:
-New Eden: city of pure capitalism
-The Holy Project: city of God in all its forms
-Technologica: city of all that is tech
-Nature's Refuge: city of Nature
Then you have the Wastelands, also called the Lost Lands, the lands between the Mega-cities.
In the Lost Lands, a group called The Horde roams around, using everything that they can re-purpose, from ruins to bodies...
There are sure to be other Mega-cities in other places, but these are the ones known to the people of Europea.