选修6unit4公开课.ppt

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1、 Unit 4 Global Warming The Earth is Becoming Warmer -But Does It Matter? 地球在变暖 要不要紧？ Reading New Words and expressions temperature 温度 one degree Fahrenheit 华氏一度 explore 探索 human activities 人类活动 phenomenon 现象 subscribe to 同意，赞成 fossil fuels 矿物燃料 byproduct 副产品 “greenhouse” gases 温室气体 atmosphere 大气 met

2、hane 甲烷， 沼气 degree Celsius 摄氏度 quantities of 大量的 accurate measurements 精确 的测量 data 资料，数据 catastrophe 大灾难 be opposed to 反对 environmental consequences 环境影响 a great range of 大量的 even if 即使 keep on 继续 Skimming Skim the title: THE EARTH IS BECOMING WARMER BUT DOES IT MATTER? What is the main topic? A.The

3、 earth. B. Global warming. C. Becoming warmer doesnt matter. The structure of the article: Introduction A title Body Conclusion Skim the body part(7 paras): Para. 1 Para. 2-3 I II Para. 4-6 III Para. 7 IV Introduction Body Conclusion Match the main idea of each part: Explain how global warming comes

4、 about. Two different attitudes among scientists towards the consequences of global warming. Introduce the problem of global warming. Give a warning and raise a question for the readers to think over. I (1) II (2-3) III (4-6) IV (7) Who wrote the article? What is the name of the magazine? Careful re

5、ading : the first paragraph: Sophie Armstrong Earth Care Part II(Para2-3) 1. Everyone believes that global warming is caused by the activities of humans. 2. Janice Foster believes that she can measure the future global rise in temperature. 3. Greenhouse Gases are totally bad. F T F 1. Greenhouse eff

6、ect is a natural p_. _ amounts of Greenhouse gases in the atmosphere. But the problem begins when we add huge q of extra carbon dioxide to the atmosphere. Therefore, more heat energy is t in the atmosphere causing the global temperature to _. Fill in the blanks about the causes of Greenhouse effect.

7、 henomenon uantities rapped go up Small Para 4. the levels of carbon dioxide have increased greatly over the last 100 to 150 years 1. Who made accurate measurements of the amount of carbon dioxide? 2. How much has increased? Charles Keeling The carbon dioxide in the atmosphere went up from around 31

8、5 parts to around 370 parts per million. Para 5. How high will the temperature go? The amount of warming could be as low as 1 to 1.5 degrees Celsius, but it could be as high as 5 degrees. What do Dr. Janice Foster and the scientist George Hambley think about the consequences of global warming? Do th

9、ey agree with one another? Para 6 They dont agree with each other. Dr. Janice Foster thinks it is serious. George Hambley thinks global warming will be mild with few bad environmental consequences. Does global warming matter? Positive effects Negative effects 1. cause the sea level to rise 2. severe

10、 storms 3. floods 4. droughts 5. famines 6. the spread of diseases 7. disappearance of species Positive effects Negative effects 1. cause the sea level to rise 2. severe storms 3. floods 4. droughts 5. famines 6. the spread of diseases 7. disappearance of species Positive effects Negative effects 1.

11、 make plants grow quicker 2. crops will produce more 3. a greater range of animals 4. make life better Disscussion: How to reduce greenhouse gases? Have a disscussion with your classmates . The earth is becoming warmer, does it matter? Homework 1.Read the text again, and try to retell it. 2.Find out the difficult sentences in the passage .