人教课标 高二 选修 6 Unit 4,Unit 4 Global warming,Warming up,From the following pictures, you will know where all this energy comes from.,windmills,a coal power station,an oil refinery,a nuclear power plant,solar panels,hydro-electric dam,Sample lists,light,heating,coal,non-renewable,oil,non-renewable,television,cassette player,video recorder,computer,natural gas,non-renewable,wind (wind power),renewable,sun (solar energy),renewable,uranium (nuclear energy),non-renewable,fridge,stove,washing machine,hairdryer,water (hydro-electric),renewable,plant waste (biomass energy),renewable,hot springs or geysers (geothermal energy),renewable,the sea (tidal energy),renewable,Renewable or non-renewable?,Renewable or non-renewable?,What is told in the picture?,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 greenhouse 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 called “greenhouse gases”, including carbon dioxide, methane (甲烷, 沼气) and water vapor.,What do you think greenhouse gases do? They trap the heat of the sun and keep the air surrounding the earth warm.,(Paragraph 1),Introduce a debate over the issue of global warming.,Raising a question,(Paragraphs 2-3),Illustrate how global warming comes about.,Giving examples, using 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 think over the issue.,Careful reading,Read the text carefully and fill in the blanks.,gases,quantities of,global temperature,catastrophe,high levels,consequences,States,positive,II. Choose the best answer. 1. The first graph in the text is used to _. attract readers attention B. introduce the topic of global warming C. act as an example D. support the opinion and make it more convincing,2. The author probably agrees that _. global warming is good for us B. we can do nothing about global warming C. catastrophes will happen if the globe keeps on warming D. much remains to be found out about the effects of global warming,Post reading,Answer 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.,2. What are the names of the three scientists mentioned 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? There are some very different attitudes among scientists towards this issue. Some think the effects will be terrible, while some others believe that we should not worry about it.,Graph I shows the temperature increase of one degree Fahrenheit between 1860 to 2000.,4. What are the two graphs about?,Graph 2 shows the carbon dioxide content in the atmosphere from 1957 to 1997.,5. What is the main topic of the article? Global warming/ the warming of the earth.,1. The temperature in the last century did not seem to increase much. 2. Everyone believes that global warming is caused by the activities of humans. 3. Janice Foster believes that she can measure the future global rise in temperature.,4. The rise in carbon dioxide is causing a steady increase in global warming. 5. George Hambley believes that global warming will do good rather than harm to the earth. 6. It is clear what the effects of global warming will be.,We should do nothing about the global warming.,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 get together. Tell each other the reasons for agreeing or disagreeing 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, potentially (潜在的), sea level to rise. We could see even more of this in the future, (maybe another 3C, or 5F),2. 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.,3. 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” (GHGs) in the atmosphere.,Green