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That was done by multiple governments banning CFCs, which is the opposite of "everyone just." The point isn't that better things are impossible — a better world is absolutely possible. The point is there has to be real action to make it better, and that action often takes the form of governments stepping in to do the right thing.
I could argue "everyone just banned cfc" where everyone is not an individual anymore but governments. I see your point tho and you are right, action has to take place this way or that way for something to change. I just wanted to visualize sometimes things do happen because the initial thought of some scientist was probably "if we just stop using cfc, the ozone layer can be safe again"(symbolic for" they found out whats causing the problem") ...is not a solution in terms of action but the action that caused the stop was initiated by exactly such a thought. So i wouldn't categorically throw such thoughts in the wind..