That world is Earth but the humans are wipe out due to nuclear war. While the remaining humans survives, the alien from another planet comes to Earth to help them evolve using their technology and use them for war from another world. That's what i remember when i look to Scorn pre-alpha footage trailer from Ebb Software the guy who wrote those comments on the video his comments got deleted because of the Spoilers for the game and when i look to check his comments again its gone. That is the original storyline for this game but Ebb Software removed it and put another so the players who played this game will try to piece the story together. Nice move Ebb Software. (I hope i copy his comment that day.)