Nobody can say how much ivory humans have used, but from a very anthro-centrist perspective the Encyclopedia Americana says that ivory has only two major characteristics--its durability and its uselessness for anything other than being made into decorative carvings.
人類用掉不計其數的象牙，卻自我中心作祟，普及各地圖書室的《大美百科全書》白紙黑字寫道：「象牙的兩大特色是耐久與無其他用途，只適合製成雕刻飾物。」