幻灯片 1 高二选修6 Unit 4 ---- 幻灯片 2Reading ---- 幻灯片 3What is the greenhouse made and used for? ---- 幻灯片 4---- 幻灯片 5---- 幻灯片 6 A greenhouse is made of glass and is used for growing plants, especially during cold weather. ---- 幻灯片 7How 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 greenhouse heat up and so the plants can grow throughout the cold period. ---- 幻灯片 8What are the “greenhouse gases”? In the atmosphere surrounding the earth there are gases, which are called “greenhouse gases”, including carbon dioxide, methane (甲烷, 沼气) and water vapor. ---- 幻灯片 9What do you think greenhouse gases do? They trap heat from the sun and therefore warm the earth. ---- 幻灯片 10(Paragraph 1) Introduce a debate over the issue of global warming. Raising a question ---- 幻灯片 11(Paragraphs 2---3) Illustrate how global warming comes about. Giving examples, using graphs, explanation. ---- 幻灯片 12(Paragraphs 4---5) List two different attitudes among scientists towards global warming. Giving examples, making contrast. ---- 幻灯片 13(Paragraph 6) It’s up to readers to think and decide whether people should do something about global warming or not. Using a question, leaving readers to think over the issue. ---- 幻灯片 14Read the text carefully and fill in the blanks. gases quantities of global temperature ---- 幻灯片 15catastrophe ---- 幻灯片 16high levels 　 consequences States positive ---- 幻灯片 17Choose the best answers according to the text. 1. Which of the 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. Janice Foster says that more carbon dioxide will make plants grow faster. A ---- 幻灯片 182. Which of the following is Dr Janice Foster’s opinion? A. The result of the temperature increase will be serious. B. The amount of warming is nothing serious. C. We needn’t worry about high levels of carbon dioxide. D. Global warming is a natural phenomenon. A ---- 幻灯片 19---- 幻灯片 20浓度单位 ---- 幻灯片 21Answer the questions. 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 reading ---- 幻灯片 222. What are the names of the three scientists mentioned in the article? They are Dr. Janice Foster, Charles Keeling and George Hambley. ---- 幻灯片 233. What do they think about global warming? Do they agree with one another? They don’t agree with each other. Dr. Janice Foster thinks the effects of global warming could be very serious. ---- 幻灯片 24 George Hambley thinks global warming 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. ---- 幻灯片 254. What are the two graphs about? Graph I shows the temperature increase of one degree Fahrenheit between 1860 to 2000. Graph 2 is about the carbon dioxide content in the atmosphere, 1958--1990. ---- 幻灯片 265. What is the main topic of the article? Global warming/ the warming of the earth. ---- 幻灯片 272. Check the statements on page 27 True: 3, 5, 6, 7, 8 False: 1, 2, 4, 9, 10 Correct sentences: 1. The temperature last century increased much. 2. Not everyone believes that global warming is caused by human activities. ---- 幻灯片 284. 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 be. ---- 幻灯片 29Debate 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). ---- 幻灯片 30● Group A discuss why they agree with the statement; Group B discuss why they disagree. ● Group A and B get together. Tell each other the reasons why agree or disagree with the statement. ---- 幻灯片 31Supplementary materials for debating Global warming 1. The planet has warmed anywhere from 0.5 to 1.0°C (1 to 2°F) over the last century. ---- 幻灯片 32 This small amount makes a huge difference, causing glaciers to melt and, potentially (潜在的), sea level to rise. We could see even more of this in the future, (maybe another 3°C, or 5°F) ---- 幻灯片 33global warming ---- 幻灯片 34global warming ---- 幻灯片 352. 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 an unusual change? Much debate about that one. ---- 幻灯片 363. The earth gets one kind of energy (visible light) from the sun and gives off another kind (infrared红外线). This kind is what gets trapped by "green house gases" (GHG's) in the atmosphere. ---- 幻灯片 37Green house gases 4. The global warming green house effect really is a bogus (假的) term. A greenhouse keeps warm by physically trapping the air inside and preventing convection (对流). The atmosphere helps keep the planet warm by trapping outgoing radiation instead. ---- 幻灯片 385. The leading gasses are Carbon-dioxide, Methane, Ozone (臭氧) and Nitrous Oxide (一氧化二氮). Gas analyzers show the concentrations of this stuff have increased somewhat since the beginning of the industrial revolution. ---- 幻灯片 396. 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! ---- 幻灯片 40green house effect ---- 幻灯片 41green house effect ---- 幻灯片 42 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. ---- 幻灯片 43green house effect ---- 幻灯片 44 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? ----
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