1、Unit 4 Global WarmingReading What is the greenhouse made and used for? A greenhouse is made of glass and is used for growing plants, especially during cold weather. How does it work? The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the green
2、house heat up and so the plants can grow throughout the cold period. What are the “greenhouse gases”? In the atmosphere surrounding the earth there are gases, which are called “greenhouse gases”, including carbon dioxide, methane (甲烷甲烷, 沼气沼气) and water vapor. What do you think greenhouse gases do? T
3、hey trap heat from the sun and therefore warm the earth.Main ideas of each partWriting techniques(Paragraph 1)Introduce a debate over the issue of global warming. Raising a questionMain ideas of each partWriting techniques(Paragraphs 2-3) Illustrate how global warming comes about.Giving examples, us
4、ing graphs, explanation. (Paragraphs 4-5) List two different attitudes among scientists towards global warming.Giving examples, making contrast. (Paragraph 6) Its up to readers to think and decide whether people should do something about global warming or not.Using a question, leaving readers to thi
5、nk over the issue. Read the text carefully and fill in the blanks.Scientists OpinionJanice Foster We need 1_ like carbon dioxide, methane and water vapour, but if we add huge 2_ extra carbon dioxide to the atmosphere by burning fossil fuels, it will cause the 3_ to go up.gasesquantities ofglobal tem
6、peratureScientists OpinionJanice Foster Over the next 100 years the amount of warming could be as low as 1 to 1.5 degrees Celsius, but it could be as high as 5 degrees Celsius. An increase of five degrees would be a 4_.catastropheScientists OpinionsGeorge Hambley Believes that we shouldnt worry abou
7、t 5_ of carbon dioxide in the air. Predicts that any warming will be mild with few bad environmental 6_.7_ that more carbon dioxide is actually a 8_ thing, which will make life for human beings better.high levels consequencesStatespositiveChoose the best answers according to the text.1. Which of the
8、 following is TRUE according to the text?A. The temperature of the earth increased about one degree Fahrenheit during the 20th century.B. The carbon dioxide content in the air increased by 70 parts per million from 1957 to 1997.C. All scientists accept the data in graph 2 except Charles Keeling.D. J
9、anice Foster says that more carbon dioxide will make plants grow faster.A2. Which of the following is Dr Janice Fosters opinion?A. The result of the temperature increase will be serious.B. The amount of warming is nothing serious.C. We neednt worry about high levels of carbon dioxide.D. Global warmi
10、ng is a natural phenomenon.AComprehendingComprehending浓度浓度单位单位Answer the questions.1. Who wrote the magazine article? What is the name of the magazine? Sophie Armstrong wrote the magazine article. The name of the magazine is Earth Care.Post reading2. What are the names of the three scientists mentio
11、ned in the article? They are Dr. Janice Foster, Charles Keeling and George Hambley.3. What do they think about global warming? Do they agree with one another? They dont agree with each other. Dr. Janice Foster thinks the effects of global warming could be very serious. George Hambley thinks global w
12、arming will be mild with few bad environmental consequences. Charles Keeling believes it is the burning of more and more fossil fuels that is resulting in a big increase in carbon dioxide.4. What are the two graphs about? Graph I shows the temperature increase of one degree Fahrenheit between 1860 t
13、o 2000. Graph 2 is about the carbon dioxide content in the atmosphere, 1958-1990.5. What is the main topic of the article? Global warming/ the warming of the earth.2. Check the statements on page 27 True: 3, 5, 6, 7, 8 False: 1, 2, 4, 9, 10Correct sentences:1. The temperature last century increased
14、much.2. Not everyone believes that global warming is caused by human activities.4. Natural gas is not a greenhouse gas but a fossil fuel.9. George Hambley thinks that more carbon dioxide is a positive thing and it will make plants grow faster.10. It is unknown what the effects of global warming will
15、 be. Debate Instructions Get into groups of six. Decide which three in your group are going to agree with the statement (Group A) and which three are going to disagree with the statement (Group B). Group A discuss why they agree with the statement; Group B discuss why they disagree. Group A and B ge
16、t together. Tell each other the reasons why agree or disagree with the statement. Supplementary materials for debating Global warming 1. The planet has warmed anywhere from 0.5 to 1.0C (1 to 2F) over the last century. This small amount makes a huge difference, causing glaciers to melt and, potential
17、ly (潜在的潜在的), sea level to rise. We could see even more of this in the future, (maybe another 3C, or 5F)global warmingglobal warming2. A definition of global warming would have to include a measurable, consistent temperature rise, like the one we have seen in recent history. A question remains Is it
18、an unusual change? Much debate about that one.3. The earth gets one kind of energy (visible light) from the sun and gives off another kind (infrared红外线红外线). This kind is what gets trapped by green house gases (GHGs) in the atmosphere. Green house gases4. The global warming green house effect really
19、is a bogus (假的假的) term. A greenhouse keeps warm by physically trapping the air inside and preventing convection (对流对流). The atmosphere helps keep the planet warm by trapping outgoing radiation instead.5. The leading gasses are Carbon-dioxide, Methane, Ozone (臭氧臭氧) and Nitrous Oxide (一氧化二氮一氧化二氮). Gas
20、 analyzers show the concentrations of this stuff have increased somewhat since the beginning of the industrial revolution. 6. The greenhouse effect raises the average temperature of the Earth by more than 30 degrees, so without it the Earth would be a very cold place! green house effectgreen house e
21、ffect GREENHOUSE Feeling helpless to do anything about global warming? Find out how one family cut their own personal greenhouse-gas emissions by 65 percent-and how you can do the same.green house effect Homework 1. Read the passage again and review the new words and expressions. 2. Prepare the debate in groups. 3. Preview Using Language - WHAT CAN WE DO ABOUT GLOBAL WARMING?
