Interesting ideas.  I'm not sure I know much about the world in the 70s, that's what wiki and Google is for though.  :)<br/><br/>It'd be less work to take a copy of Earth and simply rework certain things.   Though an entirely new world could be fun.<br/><br/>I think we've already established that the world knows about Superheroes.  If I recall correctly, that was mentioned in the interest thread.  I don't recall how long super powered individuals have been in the spotlight, though.<br/><br/>Also, iirc, Primarch wanted the team to be similar to the Ultimates/Avengers, though I think we had the choice of being a clandestine team, a team in the public limelight, a privately run team, or a team that was accountable to a "UN" of sorts.<br/><br/>For myself, I don't have any strong leaning, but I think using our own reality as the base and possibly changing the last 20 years would provide our own setting and require the least amount of work.