From the introduction:
Humanity has trashed the Earth, poisoning the atmosphere, polluting the waters, and damaging the biosphere to where humans can no longer walk freely on its surface, requiring protective gear to spend any length of time outside shelter. Most people no longer live on the planet, spread throughout the solar system in artificial habitats of varied sort.
During Stage 1 development the game was titled The Unravelers: A Game of Marxist Time Travelers at the End of History. This title was removed, but not replaced, during Stage 2 development.