ABSTRACT
Introduction The environment is an external world surrounding human beings, affecting and affected by the human. According to different attributes, environment can be divided into three parts, i.e. natural environment, artifi cial environment and social environment. Among them, the natural environment includes the atmosphere environment, water environment, soil environment, geological environment, biological environment, etc. The subsistence of human beings is closely related to the natural environment, instead of merely the high-speed development of economy and society. While China has achieved great economic growth in recent years, it should not ignore the increasingly serious environmental issues behind the development.
