参考文献：
　　[1] 高亨.周易古经今注[M].北京：中华书局，1984.
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　　Stretching Human Morality to Nature and Ecological Ethics
　　——Ecological ideas of the ancient classic The Book of Change
　　Abstract: As a prevailing work of the longest history and a symbol of ancient Chinese people’s wisdom, The Book of Change is rich in thoughts concerning ecological ethics. First, it links the harmony in the universe with the stress of morality of human beings and thus illustrates the ecological idea of the unity between mankind and nature. Second, it advocates that people should be concerned about  nature and opposes wasting or destroying natural resources. Finally, it describes an ideal social blueprint “Happiness in Ecology” which expresses the harmonious relationship between human beings and nature. Undoubtedly, all these thoughts reveal significant theoretical value as to solve the worldwide ecological crisis.
　　Key words: ecological ethics, the idea of being concerned about the ecology, the unity between mankind and nature