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Unstable, because oxygen is a diatomic element meaning that O (charge of -2) cannot stand alone, when not in a compound it must be O2. So it has a charge of -4.
Depends on your definition of air. O2 is a renewable resource, renewed from co2, but not co, by plants. Most of that is done by plants in the ocean. At current co2 production the ocean is unable to keep up with the production, and it is resulting in a more alkaline ocean, as well as a thicker layer of greenhouse In the atmosphere.