Appreciate it, this something good in the making. Small, close community. Developer that looks at suggestions, gives constant updates, and not to mention, has created a concept of post apocalyptia done right.
The green mist is, from what I've gathered based on speculation (I'm an expert speculator), Flatus of the Gods. Here is proof that in the future, farts and fart jokes are still funny.
Edit: Welcome to the apocalypse, Ski. Good to have ya.