There are spells that change the environment. However, I am not 100% sure as to how they work with this mechanic.
In fact I think only "Bonechilling winter" changes the environment, and not the terrain. That would remove any bonuses for anyone in the tile. edit: Bonechilling winter is the internal name for Forsake Land. Edit2: Freeze Settlement also removes the bonus.
The difference between environment and terrain is this: environment is the top layer, terrain is the bottom layer. So for example, you can have the terrain Hills with kingdom environment or fallen environment (or arctic or desert or "barren" which is default).