Humans generally do not inhabit extreme environments. There are organisms referred to as extremophiles that do live in such conditions, or just crazy players a "guide" to extreme environment planets why we need hostile environments .give variety to the player-base and allow for more adventure, technical thinking , ect .new ore and mining for rare materials only on these planets  "cough" hazard pay "cough"   Planetary Hazards   Toxic  Class N (sulfuric