[Roanon]

Originally posted by Captain Kwok:
It adds atmosphere types to racial traits. For example, if you were playing a rock race - you'd have to pick "Rock Natives" trait in order to get the rock colony module.

But you can research the other atmosphere techs? Disallowing that would take an important feature from the game, I think. Plus, the problem can also be solved by generally disallowing trades, which I prefer anyway.