There are some parks within the city, that will appear to have natural life and dirt! However, upon closer inspection it will be obvious that it's actually fake and it is only designed to look like dirt and grass.

It will also depend on how determined Geir is to look for the outside of the city, and how much time he would put in to searching! Because of the clouds/storm, he will not be able to get up very high unless he wanted to fly up over the storm, in which he would only be able to see clouds in every direction. Under the clouds would involve a maze of buildings and towers, so it will take time and care to fly through that.

Asking around or looking immediately around him, there doesn't seem to be an edge or end to the city, and none of the robots seem to know of any other natural life forms other than you Circle members!