What is a redox reaction?

the reductant transfers electrons to the oxidant. Thus, in the reaction, the reluctant or reducing agent loses electrons and is oxidized, and the oxidant or oxidizing agent gains electrons and is reduced.

Redox ReactionA chemical reaction involving both reduction and oxidation, which results in changes in oxidation numbers of atoms included in the reaction.

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.