高中英语-人教版选择性必修第三册-Unit-3课件

1、UNIT 3ENVIRONMENTAL PROTECTION1UNIT 3122To discuss climate changeTo learn to identify the style of this text and infer the writers purpose To learn to draw a diagramTo think about how we can do to deal with climate change3To discuss climate change3Climate change is a heat topic for the scientists ar

2、ound the world. They all try to find out the truth about these questions:What causes the climate change?What are the solutions to stop climate change?View the video.4Climate change is a heat topic55But someone may ask: is climate change really a problem? Why?It leads to floods/flooding.Its getting h

3、ot and hotter and so there are more droughts.The polar ice sheet is melting and the sea levels are rising. Sea-level rise in turn causes damage to coastal regions.6But someone may ask: is climatLead to extreme weather which in turn impacts farming and harvestsDisrupt the balance of the ecosystemDest

4、ruct wildlife Deforestation7Lead to extreme weather which What is the graph about? What information can you get from it?Have you ever seen the photo before? What might be the story behind it?Discuss climate changeBefore you read, look at the graph and the picture on Page 26 and discuss these questio

5、ns in groups.8What is the graph about? What 1. What type of writing is this passage? Argumentative writing Narrative writingC. Expository writingD. Advertising writingC2. In which part of a newspaper or magazine may we find this passage?Entertainment B. EconomyC. Education D. EnvironmentDRead the pa

6、ssage quickly, and choose:91. What type of writing is thiRead the text quickly, and figure out the main idea of each paragraph.Para. 1The earth is getting warmer.Para. 2A specific example of the results of climate changePara. 3A major reason of global warming is “man-made” greenhouse effect.Para. 4T

7、he danger of rising temperaturePara. 5We should seize every opportunity to reduce global warming.10Read the text quickly, and figRead the text carefully, and answer the questions.What happened to the polar bear in the photo? Why did the writer write about it? Possible answers: The polar bear died of

8、 starvation/hunger. The write used this alarming case as an example to show us how the increase in temperature had terrible impact on Earths ecology.11Read the text carefully, and adead polar bear inNorways Arctic island of Svalbard12dead polar bear in122. Why is the “natural” greenhouse effect impo

9、rtant and necessary? One possible answer: Greenhouse gases can trap some of the heat, which can keep Earths climate warm and habitable. Without this process, Earth could not sustain life.132. Why is the “natural” greenh1. What are the “greenhouse gases”? In the atmosphere surrounding the earth there

10、 are gases called “greenhouse gases”, including carbon dioxide, methane (甲烷, 沼气).2. How do you understand “greenhouse effects”? They trap the heat from the sun, which causes the temperature of earth goes up. Related questions:141. What are the “greenhouse ga3. What are the consequences of high green

11、house gas emissions? Possible answers: Earths surface temperature to rise extreme weather natural disasters low sea-ice levels causing deaths economic losses153. What are the consequences o4. Why did the author mention the climate scientists warning?One possible answer: The topic is a scientific one

12、, so adding the climate scientists warning can make the authors opinion (or writing) more persuasive form the scientific aspect. On the other hand, we readers may feel more reliable about the authors attitude if it is based on the research of some scientists.164. Why did the author mention 5. What i

13、s the authors purpose of writing this text?One possible answer: The author hopes we can pay attention to the climate change and do something to stop it. For he or she writes “We as individuals can also reduce our carbon footprint” and “It is our responsibility to seize every opportunity to educate e

14、veryone about global warming.”175. What is the authors purposThe _ is getting warmer and warmer. Evidence one: _Evidence two: _Evidence three: _a warming ocean and atmosphere Read paragraph one, and fill in the blanks.Earthmelting icerising sea levels18The _ is getting warmerTime Where What happened

15、How did it happen2013Norways Arctic island of SvalbardA polar bear died of starvation.Paragraph 2 introduces an example of the increase in temperature that had an impact on Earths ecology. Read it and fill in the blanks.The bear cannot hunt food because of low sea-ice levels.19Time Where What happen

16、edHow diTrap heat from the sun to keep the Earths sustainable life.Read Paragraph 3, and figure out the reason why earths temperature rising.Green-house effect“Natural” greenhouse effect“man-made” greenhouse effectBy burning fossil fuels, extra greenhouse gases cause Earths temperature to rise.20Tra

17、p heat from the sun to keepRead the article again and create a diagram describing how the greenhouse effect works.图表；图解21Read the article again and creDraw a diagramDiagrams are very useful tools that can be used to brainstorm ideas, map out processes, show cause and effect relationships, explain a

18、new idea or concept and so on. When you read an essay about scientific issues, you can try drawing a diagram, which will not only allow you visualise the problems more clearly but also can help demonstrate your creative thinking and problem-solving.22Draw a diagram22Summarize the main idea of paragr

19、aph 4, according to the diagram.Temperature risingExtreme weather & natural disasterSerious damage & human livesWe should take appropriate actions at once.23Summarize the main idea of parIn Paragraph 5, the author hopes everyone can take actions to reduce our “carbon footprint”. As individuals, what

20、 can we do in our daily life to help to minimize climate change? 24In Paragraph 5, the author hopUse renewable energiesSave energyStop using plastic bagsLive a low-carbon lifeUse the minimum paper, backing paper etc.Take green transportationTake a shower instead of a bathTurn off the lights, compute

21、rs etc. the moment you dont need them25Use renewable energies25Discuss the questions in groups.What examples of extreme weather and disasters do you know? Can you make a list?Do you think climate change is the result of human activity? Give your reasons.Who do you think should take responsibility fo

22、r dealing with climate change? What can we do?26Discuss the questions in groupWords you may use:Adjs: inhospitable, sever, mild, hot, tropical, reusable, recycled, economicVerbs: mitigate/reduce/alleviate/minimise climate change; deal with/ tackle/ solve/stop/ prevent climate changeNouns: Gas emissi

23、ons, carbon dioxide, CO2, fossil fuels, extreme weather, natural disasters, rainstorms, heatwavesadj. 不适宜居住的27Words you may use:adj. 不适宜居住的2Global warming1. The planet has warmed anywhere from 0.5 to 1.0 (1 to 2) over the last century. 2. A definition of global warming would have to include a measur

24、able, 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.Supplementary materials28Global warmingSupplementary ma3. 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 “greenhouse gases” (GHGs) in the atmosph