artificial intelligence Part II On the other hand, the disadvantages of AI are obvious in some industries which are labor-intensive and easy-replaced. On the individual scale, The workers in those industries will be severely influent because of the redundancies. It will be a disaster for those families once the changes taken place on them. They couldn't afford any goods and services , although the prices of them are dramatic low. On the society scale, the sudden and vast unemployment is big risk to the safety of society, It may cause the unrest once It is out of control. On the human being scale, The man who is not skillful and high educated will be the scums (any better word?) of society, because their life are meaningless and they are useless for society manufacture. In a word, today's world faces both opportunities and challenges.