if something causes something else then then reducing that something will prevent that something else
punishment is deterrent_against_doing_wrong_things. preventing is not preventing. punishment is not deterrent_against_doing_wrong_things. change is when_one_thing_becomes_another_thing. barrier is not preventing. preventing is preventing. humans has not many_reasons_for_doing_things prevention_of_spoilage is preventing. change is not when_one_thing_becomes_another_thing. barrier is preventing.