Biogenic Atmosphere
Description: The composition of this planet's atmosphere is the product of the metabolic functions of the indigenous biological organisms. This is highly beneficial to creatures with organic metabolisms but can be toxic or corrosive to other life-forms.
- population bonus for organic metabolism species
- population malus for other species
- can be found on any planet type except barren, asteroids or gas giants
- possible extra chance to be found on terran, ocean or swamp planets (?)
- possible extra chance for the planetary cloud-cover special (?)
Description: The composition of this planet's atmosphere is the product of constant geological and volcanic activity. This is highly beneficial to creatures with lithic metabolisms but can be toxic or corrosive to other life-forms.
- population bonus for lithic metabolism species
- population malus for other species
- can be found on any planet type except barren, asteroids or gas giants
- possible extra chance to be found on inferno, toxic or tundra planets (?)
- possible extra chance for the planetary ash-clouds special (?)
Description: The composition of the local planet's atmosphere is the product of sustained industrial activity and the resulting waste. This is highly beneficial to robots but can be toxic or corrosive to other life-forms.
- population bonus for robotic metabolism species
- population malus for other species
- can be found on any planet type except barren, asteroids or gas giants
- possible extra chance to be found on radiated, toxic or desert planets (?)
- possible extra chance for planetary cloud-cover or ash-clouds special (?)
In addition you could also have "no atmosphere" as a special, maybe a universal population malus but some small bonus to research and industry focus with a passive boost to supply or infrastructure.