What is an environment? An environment is the aggregate of everything we interact with. Physical, social, emotional, sensational... if we can interact with something, have a relationship with it, then it is a part of our environment.
Disability is often considered a medical condition. But an alternate view is that it's an environmental condition; someone is disabled because they are limited in their interaction with their own environment. In my case at the moment, I am considered temporarily and mildly disabled because my broken wrist and damaged knee prevent me from interacting with my environment in the manner that I ordinarily would.