1、 Unit 4 Unit 4Global warming授課教師：包麗美授課教師：包麗美Look at the video and what do you know about global warming. 全球氣候變暖是一種全球氣候變暖是一種“自然現(xiàn)象自然現(xiàn)象”。人們焚燒。人們焚燒化石礦物以生成能量或砍伐森林并將其焚燒時(shí)會(huì)產(chǎn)化石礦物以生成能量或砍伐森林并將其焚燒時(shí)會(huì)產(chǎn)生二氧化碳等多種溫室氣體。這些溫室氣體對(duì)來(lái)自生二氧化碳等多種溫室氣體。這些溫室氣體對(duì)來(lái)自太陽(yáng)輻射的可見(jiàn)光具有高度的透過(guò)性，而對(duì)地球反太陽(yáng)輻射的可見(jiàn)光具有高度的透過(guò)性，而對(duì)地球反射出來(lái)的長(zhǎng)波輻射具有高度的吸收性，能強(qiáng)烈吸收射出來(lái)

2、的長(zhǎng)波輻射具有高度的吸收性，能強(qiáng)烈吸收地面輻射中的紅外線，導(dǎo)致全球氣候變暖，也就是地面輻射中的紅外線，導(dǎo)致全球氣候變暖，也就是常說(shuō)的常說(shuō)的“溫室效應(yīng)溫室效應(yīng)”。全球變暖會(huì)使全球降水量重。全球變暖會(huì)使全球降水量重新分配、冰川和凍土消融、海平面上升等，既危害新分配、冰川和凍土消融、海平面上升等，既危害自然生態(tài)系統(tǒng)的平衡，更威脅人類的食物供應(yīng)和居自然生態(tài)系統(tǒng)的平衡，更威脅人類的食物供應(yīng)和居住環(huán)境。住環(huán)境。energy sourcesWe depend on energy to do many things in our daily lives. For example, energy lights

3、our cities and heats our buildings. Wind energy is used as power to produce electricity . Windmillswhere electricity is produced by burning coals.The coal power stationsin which oil is refined and made pure. The Oil Refineriesa facility designed to change nuclear energy into electricity.A nuclear po

4、wer plant on the roof of a house on a bright sunny day are used to collect solar energy, making your house warm or heating your water.Solar panelsThe Hydro-electric dams are used to keep back water and raise its level for irrigation or for producing electricity, etc. An energy source is “renewable”

5、when supplies of it never run out and “non-renewable” when one day they will run out. Which energy sources on your list are renewable and which are non-renewable? DiscussRenewable or non-renewable?Renewable or non-renewable?n. 圖表圖表; 坐標(biāo)圖坐標(biāo)圖; 曲線圖曲線圖graphadj. 胡亂的胡亂的; 任意的任意的randomn. 現(xiàn)象現(xiàn)象 phenomenonsubsc

6、ribevi. 同意同意; 捐贈(zèng)捐贈(zèng); 訂閱訂閱n. 燃料燃料fueln. 量量; 數(shù)量數(shù)量quantityvi. 趨向趨向; 易于易于; 照顧照顧tendvt. 照顧照顧; 護(hù)理護(hù)理n. 資料資料; 數(shù)據(jù)數(shù)據(jù)datan. 大災(zāi)難大災(zāi)難; 浩劫浩劫catastrophen. 洪水洪水; 水災(zāi)水災(zāi) floodn. 趨勢(shì)趨勢(shì); 傾向傾向; 走向走向trendopposedadj. 反對(duì)的反對(duì)的; 對(duì)立的對(duì)立的 adj. 溫和的溫和的; 溫柔的溫柔的; 淡的淡的mildvt. 反對(duì)反對(duì); 反抗反抗; 與與(某人某人)較量較量opposevt. 陳述陳述; 說(shuō)明說(shuō)明staterangen. 種類種類;

7、 范圍范圍n. 結(jié)果結(jié)果; 后果后果; 影響影響consequencewords revision come about subscribe to quantities of go up result in be opposed to even if keep on導(dǎo)致導(dǎo)致反對(duì)反對(duì)即使即使繼續(xù)繼續(xù)發(fā)生發(fā)生; 造成造成同意同意; 贊成贊成; 訂購(gòu)訂購(gòu)?fù)督低督荡罅康拇罅康纳仙仙? 增長(zhǎng)增長(zhǎng); 升起升起MatchWords: quantity, tend, oppose, opposed, state, rangeExpressions:come about, quantities of, go

8、up, result in, be opposed to, even if, keep onPatterns:There is no doubt that the attitude of sb. towards sth. A greenhouseis made of _ and is used for growing _, especially during _ weather.What is a greenhouse made of and used for?glassplantscoldGreenhouse gasesWhats greenhouse gases effect? Green

9、house gases perform the same function as the glass in a greenhouse - They trap the heat of the sun and keep the air surrounding the earth warm. It is called the greenhouse effect.The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhous

10、e heat up and so the plants can grow throughout the cold period.How does a greenhouse work?The Earth Is The Earth Is Becoming Warmer Becoming Warmer But Does It But Does It Matter?Matter?Fast Reading3.What is the main topic of the article?Global warming / The warming of the earth.Sophie Armstrong wr

11、ote 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.1. Who wrote the magazine article? What is the name of the magazine?4.Whats the main idea of each pa

12、rt? (4 parts)Part1 (para1); Part2 (para2-4); Part3(para5); Part4 (para6) main ideaPart1 (para1)Introduce the cause of global warmingPart 2 (para2-5)Part 3 (para5)Part 4 (para6)Illustrate how global warming comes aboutList two different attitudes among scientists towards global warmingIts not clear t

13、o think and decide whether people should do sth about global warming or not 4 partsDetailed-Reading 1.What are the two graphs about?2. How has the global warming come about?3.What are the effects of global warming?1.What are the two graphs about?Graph 1 shows the temperature increase of one degree F

14、ahrenheit between 1860 to 2000.Graph 2 shows the increase of carbon dioxide content in the atmosphere from 1957 to 1997.Graph 1:Graph 2:2. How has the global warming come about? Human activity- burning of fossil fuels. Greenhouse effect- greenhouse gases- we need those gases. Huge quantities of extr

15、a carbon dioxide-from 1957 to 1997-from around 315 parts per million to around 370 parts per million.3.What are the effects of global warming? Encourage a greater range of animals.The sea level to rise. Severe storms, droughts, famines, the spread of diseases, and destruction of species. Make plants

16、 grow faster. Crops will produce more.1.The temperature last century didnt increase much.2.Everyone believes that global warming is caused by the activities of humans.3.Janice Foster believes that global warming is caused by burning fossil fuels. 4.Natural gas is a greenhouse gas.5.Carbon dioxide is

17、 a byproduct of burning fossil fuels.6.People accept Charles Keelings data because he took accurate measurements. Read the article carefully. Tell true or false.TTFTTFThere is no doubt that the earth is becoming warmer and that it is human activity that has caused this global warming rather than a r

18、andom but natural phenomenon.All scientists subscribe to the view that the increase in the earths temperature is due to the burning of fossil fuel like coal, natural gas and oil to produce energy.Analyse following sectences同位語(yǔ)從句同位語(yǔ)從句+強(qiáng)調(diào)句型強(qiáng)調(diào)句型同位語(yǔ)從句同位語(yǔ)從句主主+系系+表表3. It was a scientist called Charles Keeling, who made accurate measurements of the amoumt of carbon dioxide in the atmosphere from 1957 to 1997.4. They also agree that it is the burning of more and more fossil fuel that resulted in this increase in carbon dioxide.5. Dr Foster thin