研究生英语下第四单元.ppt

Man and Nature Although humans currently comprise only a minuscule proportion of the total living biomass on Earth, the human effect on nature is disproportionately large. The development of technology has brought about greater exploitation of natural resources and has helped to alleviate/decrease some of the risks from natural hazards. In spite of this progress, however, the progress of human civilization remains closely linked to changes in the environment. There exists a highly complex feedback loop(反馈环)between the use of advanced technology and changes to the environment that are only slowly becoming understood. Man-made threats to the Earth’s natural environment include pollution, deforestation(森林采伐), and disasters such as oil spills. Humans have contributed to the extinction of many plants and animals. Humans employ nature for both leisure and economic activities. The acquisition(获得物) of natural resources for industrial use remains the primary component of the primary component of the world’s economic system. Some activities, such as hunting and fishing, are used for both sustenance(食物、生计) and leisure, often by different people. Agriculture was first adopted around the 9th millennium BCE (before common era) . Ranging from food production to energy, nature influences economic wealth. Discuss in groups the following questions: 1. What’s the relationship between man and nature? 2. Many species of wildlife are reported to have become extinct or to be on the verge of extinction. What do you think causes this problem? 3. In your opinion, what measures should be taken to preserve the biodiversity of wildlife? Useful words and expressions: interrelated/inseparable/interdependent/interactive protect/benefit/harmony destruct/disaster/take revenge on(复仇、报复) global warming /greenhouse effect earthquake/flood/sandstorm Wolf and biological chain ? 人、动物、与人文、自然的关系，是一个奇妙而复杂的关系。这是我们常常思考的问题。????不妨先从狼说起。自古以