What causes the vast majority of people to be so diligent in attaining the maximum satisfaction of basic needs? Even if they know that the earth as a closed system cannot adapt to the increasing consumption of resources. From this observation alone, they should come to the conclusion that a human has nothing in common with a monkey. If humans behaved like monkeys, one would not have to worry about planet earth or its creatures. What drives many people, besides a thirst for power and money, to such reprehensible behavior? Book text in Chinese.