unit4 global warming

1、Unit 4 Global WarmingUnit 4 Global WarmingSave the earth!We depend on energy to do many things in our daily lives. Can you make a list of sources of energy?Warming up:Water powerSolar energyWind powerWindmill 风车风车underground heat 地热地热 coalthe burning of fossil fuels大亚湾核电站大亚湾核电站Nuclear energyWhich re

2、source is renewable?Water powerCoal Solar energyWind powerUnderground heatFossil fuelsNuclear energyThe earth is becoming warmerBut does it matter?1. Have you ever seen a greenhouse?is made of glass used for growing plants, especially during cold weather.2. How does the greenhouse work?The air insid

3、e was warm because the glass traps(挡住挡住, 吸收吸收) the heat from the sun and keeps it from escaping(逃跑逃跑). This makes the greenhouse heat up(热量热量上升上升) and so the plants can grow throughout(在在期间期间) the cold period.3. What are Greenhouse Gases?Methane4Ozone51Carbon dioxide2Water vapor1 1Nitrous oxide34. G

4、reenhouse EffectGlobal warmingGreenhouse gases trapped the heat from the sun, which causes the temperature of earth goes up. Greenhouse effectGreen house effectTHE EARTH IS BECOMING WARMER BUT DOES IT MATTER? Reading 1) How many paragraphs does the reading 2) Make a division of the text.Read the pas

5、sage quickly (3)text consist of? Please number them.Fast-ReadingMain idea of each part:Part 1:Part 2:Part 3:Part 4:The background of this article. Its up to readers to think and decide whether people should do sth about global warming or notExplanation about how global warming comes about.Two differ

6、ent attitudes among scientists towards global warming.(Para 1)(Para 2-5)(Para 6)(Para 7)Part 1: Para1: The backgroundSophie Armstrong ; “ Earth Care”2. Who wrote the magazine article? What is the name of the magazine?1. What has happened to the temperature of the earth during the 20th century?It ros

7、e about one degree Fahrenheit. How has the global warming come about?Explanation about how global warming comes about. Para 2-5Part 2Human activity- burning of fossil fuels. Greenhouse effect- greenhouse gases - we need those gases. We add huge quantities of extra carbon dioxide into the atmosphere.

8、 The carbon dioxide content of the atmosphere went up from around 315 parts per million to around 370 parts per million from 1957 to 1997 (See Graph 2 on Page 26 )A Scientist called Charles keeling made accurate _ of the amount of _ in the atmosphere from _ to _ .He found that between these years th

9、e carbon dioxide in the _ went up from around _to around _ per million. measurementscarbon dioxide19571997atmosphere315 parts370 partsTwo different attitudes among scientists towards global warmingPart 3:Dr Janice FosterGeorge HambleyAny trend in which the temperature increased by 5 degrees would le

10、ad to a catastrophe.It could be very serious.Dr Janice Fostersevere stormsA rise of several meters in the sea levelfloodsdroughtsfaminesthe spread of diseasesthe disappearance of speciesGeorge HambleyWe should not worry about _ in the air.They predict that any warming will be _ with few environmenta

11、l _. More carbon dioxide is actually _. It will make plants _; crops will _; it will encourage _high levels of carbon dioxidemildconsequencesa positive thinggrow quickerproduce morea greater range of animals.Greenhouse gases continue to _ in the atmosphere. _ we start reducing the amount of carbon d

12、ioxide and greenhouse gases, the climate is going to _ warming for decades or centuries. No one knows the effects of global warming. Does that mean we should do nothing? Or, are the risks too great?Two choices of dealing with this problem.build upEven ifkeep onTry to reduce the use of motor vehicles

13、electric vehiclebikerunningSolar energy carPlanting treesCleaning the rubbishDont use disposable plastic bags !Return the green world to us!Thank you!Para 1: 1. come about 2. explore these questions 重点句子：but it is a rapid increase when compared to other natural changes.Para 2: 1.毫无疑问 Para 3: 1. subs

14、cribe to 2.因为,由于 3. the burning of fossil fuels 4. 自然现象 5.温室效应 6. quantities of 7. be trapped in 8. go up Para 4：1. the levels of carbon dioxide 2. 在过去的100至150年 3. from around 315 parts to around 370parts per millionPara 5: 1. accept the data 2. result in 3. 低到/低至 4.高达Para 6: 1. 一方面一方面另一方面另一方面 2. 导致

15、大灾难 3. be opposed to 4. 是件好事 5. a greater range of animalsPara 7: 1. Greenhouse gases 2. build up 3. 尽管；即使 4. keep on 5. for decadesNew words and expressions:come about:be at random:subscribe to:quantities of:go up:result in:be opposed to:even if:keep on:on the whole:on behalf of:put up with:发生；造成发生

16、；造成随机的；任意的随机的；任意的同意，赞成；订购；捐献同意，赞成；订购；捐献大量的大量的上升；增长；升起上升；增长；升起导致；造成导致；造成反对反对即使；尽管即使；尽管继续继续大体上；基本上大体上；基本上代表代表一方一方忍受；容忍忍受；容忍1. If you _ to the newspaper, itll be delivered to your door.2. The train accident was terrible, but nobody knew how it _.3. It is usually a lot cheaper if you buy the fruit _.4.

17、His carelessness _ a terrible accident.5. Hell get into trouble if he _ like this!6. If you want to make the kite _, pull the string hard and then release it slowly.7. The manager cannot be here, so I will host the meeting _.8. He couldnt _ the noise so he kept the window shut all day.put up with; c

18、ame abouton his behalfgo upkeeps onresulted inin quantitysubscribe toLanguage PointsPara 1:but it is a rapid increase when it is compared to other natural changes._ with the size of the whole earth, the biggest ocean doesnt seem big at all. Compare B. When comparing A.C. Comparing D. When comparedD解

19、析：when the biggest ocean is compared with the size of the whole earth, the biggest ocean doesnt seem big at all.Para 2: 毫无疑问他喝了很多酒。毫无疑问这对他来说是个黄金机会。There is no doubt that he consumed a great deal of alcohol.There is no doubt that its a golden opportunity for him.Do you have any doubt _ our school foo

20、tball team will win in the finals?A. whether B. what C. which D. that I doubted _ he had told me the truth. A. whether B. what C. which D. that DD解析：I doubt whether/if I dont doubt that Do you doubt that.?强调句型：it is/was +被强调部分+that/who + 其他Para 2: It is (human activity) that has caused this global w

21、arming rather than a random but a natural phenomenon.Para 4: It was (a scientist called Charles Keeling )who made accurate measurements of the amount of carbon dioxide in the atmosphere from 1957 to 1997.Para 5: They also agree that it is (the burning of more and more fossil fuels) that has resulted

22、 in this increase in carbon dioxide.强调句型的特征; 去掉去掉it is/was和和that/who仍是完整的一句话1.是他他做的这个决定。2. 我们在学校门口遇到的是他他。3. Tom是在公园在公园丢失的手表。4. 就是当当Mary正准备睡觉的时候正准备睡觉的时候电话响了。It is he who made the decision.It was him that we met at the school gate.It was in the park that Tom lost his watch.It was when Mary was about t

23、o go to bed that the telephone rang.Was it in the park that Tom lost his watch?Where was it that Tom lost his watch?1._ find my wallet，Tom？ Where did you thatB. Where was it you C. Where have youD. Where was it that you 2.It is the ability to do the job _matters，not where you came from or what you a

24、re. A. one B. it C. what D. that 3. It was about 600 years ago _ the first clock with a face and an hour hand was made. thatB. untilC. beforeD. when4. It was not _she took off her glasses _I realized she was a famous film star. when, that B. until, thatA.C. until, when D. when, thenDDABPara 3:All sc

25、ientists subscribe to the view that the increase in the earths temperature is due to the burning of fossil fuels 模仿写句子：模仿写句子：所有老师都同意这个观点：课堂使用手机是由于学生们缺乏自所有老师都同意这个观点：课堂使用手机是由于学生们缺乏自制力。制力。All the teachers subscribe to the view that using mobile phone in class is due to the lack of confidence for studen

26、ts.同位语从句同位语从句Some byproducts of this process are called “greenhouse” gases, the most important one of which is carbon dioxide.我们班有60个学生，其中13个是女生。Our class consists of 60 students, 13 of whom are girls.仓库里有些桌子，其中一些桌子是坏的There are some desks in the garage, some of which are broken.Without the “greenhou

27、se effect”, the earth would be about 33 degrees Celsius cooler than it is.含蓄虚拟语气：without, or, otherwise, but, but for与现在事实相反：与过去事实相反:would/might/could + vwould/might/could + have doneWithout air, man _ exist on the earth. A. couldnt B. cant C. may not D. wontWithout your help, I _ the exam last week

28、. A. would have passed B. would have failed C. will fail D. would failABIt means that more heat energy tends to be trapped in the atmosphere causing the global temperature to go up.It means that为宾语从句为宾语从句倾向于/常常做某事：照顾某人：tend to do sthtend (to) sb“causing the global temperature to go up.”现在分词作状语现在分词作状语现在分词：表主动，进行1.穿过马路，这位老人被车子撞到了