Planet is what the living organism that dominates the planet is called. In earlier scripts it was called Chiron.
Its fungus acts as a giant brain. It can control all forms of native life, using them to attack any who upset it.
It begins to speak to the colonist after a certain time period, and gains understanding of them over time.
Planet as a Society Effect(link) represents your society's sensitivity to the ecology of Planet(link). A low score indicates that ecological damage will occur more quickly. A high score allows you to capture native life such as mind worms(link).
-3: Wanton ecological disruption; -3 fungus production
-2: Rampant ecological disruption; -2 fungus production
-1: Increased ecological disruption; -1 fungus production
0: Normal ecological tension
1: Ecological safeguards! Can capture native life forms
2: Ecological harmony! Increased chance of native life form capture!
3: Ecological wisdom!! Maximum chance of native life form capture!!