wjaksd（wjaksd）.doc

wjaksd（wjaksd） Environment and health Clinical medicine, seven years, Guo the Great Wall, 063030 We human beings live in the great environment of the earth. On the one hand, we depend on the environment for survival. On the other hand, we are constantly transforming the environment. But it is true that we cannot be independent of human environment, as far as we know, the earth is the only place a suitable for the survival of mankind, all human civilization is built on this large building on earth. So the environment has an extraordinary effect on us. I. The concept of environment Environment is relative to a central object. All the things that are related to it constitute the environment of this central thing. For human beings, environment means the space that human beings depend on and the factors it contains. It is a big category and a very complicated system. It provides the material basis for the survival of the air, food and water, while providing the social environment for human intelligence, morality, social and spiritual development. WHO public health expert committee for the definition of environment is: the environment refers to the overall state composed of physical and chemical, biological and social factors at a particular moment, these factors may be of vital organism or human activities directly or indirectly generate temporary or long-term effects. According to the evolution of the universe and the theory of biological evolution, human beings appeared on the earth about 2 million years ago, and they are the product of the evolution of the earth environment to a certain stage. In this long process, man is the adaptation of the environment and the reformer of the environment. The human body and environment are not only unified in substance, but also exchanged in material and energy, and dynamic balance is maintained. This balance is the basic condition for the survival and health of human beings. If this balance is destroyed, human health will be jeopa