I believe you could technically categorize this as Biology, if another problem arises in the future.
To start off, as has been stated already, there is a cycle of oxygen and carbon dioxide that loops between us and plants. Plants take in the CO2 we breath out, and we take in the O2 they expel.
Another basic necessity is shelter. We use many parts of our environment to house ourselves, from wooden frames to stone masonry. The shelters we build depend on the amount of the given resource found in nature.
What we eat is entirely dependent of nature. We eat what the environment provides. The beef, pork, beans, vegetables, and fruits are all products of the environment.
I hope this gives more insight into how we interact with the environment to fulfill basic needs.
