if something causes something else then then reducing that something will prevent that something else
preventing is action. preventing is preventing. prevention_of_spoilage is preventing. things has limits sometimes_change is good_thing. change is when_one_thing_becomes_another_thing. humans has many_reasons_for_doing_things barrier is preventing. do_what is right_and_will_avoid_evil. punishment is deterrent_against_doing_wrong_things.