I'm trying to adapt the temperate_grassland_infertile climate to something nasty for a small area of my campaign map, that isn't going too badly. It needs a lot of tweaking but I think I at least know which bits need changing.

However:


I'm having a little bit of trouble getting rid of the ambient tree tiles (or whatever you call them), I'm sure I should know this but I can't find where they are referenced / linked to climate....

any ideas?