1、Unit 4 Global WarmingUnit 4 Global WarmingSave the earth!Energy sources?International relations?Money?Technology?Which is the most important to a country?Man power?2.Sources of energy(ie.coal)We depend on energy to do many things in our daily lives.For example,energy lights our cities and heats our
2、buildings.Make a list of1.Things that use energy around us or at any other places,(ie.light)Things that use energy around us or at any other places:In a houseMobile Pentium 4hairdryerinduction cookerWindmills,renewable.What?Renewable?What?Renewable?A coal power station,non-renewable.What?Renewable?A
3、n oil refinery(精炼厂),non-renewable.What?Renewable?A nuclear power plant,non-renewable.What?Renewable?A hydro-electric dam,renewable.Geothermal(地热的)Energy Plant Coal Oil Natural gas Uranium化铀 Wind(wind power)Sun(solar energy)Water(hydro-electric power)Plant waste植物性废物(biomass energy生物团能量)Hot springs o
4、r geysers间歇泉(geothermal energy)The sea(tidal energy潮汐能)Fossil fuelsNon-renewableRenewableWhat are fossil fuels?Fossil fuels are Ancient animal and plant material below the surface of the earth with a high carbon content,such as coal,oil and natural gas,which can be burnt to produce energy.They are a
5、lso known as non-renewable energy because once they are run out of/run out,they cannot be renewed.What are these buildings made of and what are they called?glassA greenhouse is used for growing plants,especially during cold weather.greenhouseWhats the use?The glass trapsthe heat from the sun,making
6、the air warm so that plants can grow better.How does it workWhat are Greenhouse gases?In the atmosphere surrounding the earth there are gases,which are called“greenhouse gases”,mainly including _,and water vapor(水蒸气).carbon dioxideCarbon dioxideMethaneWater vaporWhat do you think greenhouse gases do
7、?Greenhouse gases perform the same function as the _in a greenhouse -They _the heat from the sun and therefore _the earth.It is known as_.Nowadays our earth is becoming _.greenhouse effecttrapwarmwarmer and warmerglassP26The Earth is Becoming Warmer-But Does It Matter?Fast readingThis article is fro
8、m _.a.An enviromental magazine.b.A diaryC.A novel d.A storyIt has a title,a first paragraph that is in bold,the main text in two columns,2 graphs,two quotes引用，引号.What is the structure of a magazine like this and how is the text organized?2.What is the purpose of the paragraph that is in bold?To intr
9、oduce the topic.See the next page3.What are the graphs for?Questionnaires-I1.What is the purpose of the title?To tell us the topic of Global warming4.Why are there two quotes?Because they are important or interesting points.Their aim is to attract your attention and to make you read them,and therefo
10、re to make you interested enough to read the whole article.Lets learn the main text How many paragraphs does the main text consist of?And it can be devided into 4 parts.Please line out the correct numbers in the following tableMain ideas of each part各段大意Writing techniques写作方法Para._Introduce the issu
11、e of global warmingRaising a question提出问题illustrate举例说明；图解 how global warming comes aboutPara._ Giving examples举例子,using Graphs列图表,Explanation 作诠释List two different attitudes to global warmingPara._Giving examples举例子Making contrast作比较whether people should do something about global warming or notPara
12、._12-456leaving a questionthe structure of the text:Para.1Para.2-4IIIIIIPara.5IIIIIIPara.6IVIV Introduction BodyConclusionlearningThe organization of an expository essay:IntroductionA titleBodyConclusionDetailed-Reading Read the article in details and finish the following task.Read the passage again
13、 to find out the answers to the questions in Ex.1on P27Task 11.Who wrote the magazine article?What is the name of the magazine?2.What are the two graphs about?Sophie Armstrong,Earth Care.Task 2Read something more about the 2 graphs:Lets check it:The 1st graph shows the global t_ between 1860 and_.Th
14、e temperaturei_ and decreased over this period but on the whole it i_by around one degree Fahrenheit.During this time,the earth reached its l_temperaturein about 1910 and its highest in_ .There was a steady i_in the temperature during the 20 years after 1980.We can see from the graph that the earth
15、has become w_since early last century.emperature2000ncreasedncreasedowest2000ncreasearmerThe 2nd graphThe 2nd graph shows the amount of c d in the atmosphere from to 1997.The Co2 c steadily iover this forty-year period.It went up from 315 to parts p million.arbonioxide1957ontentncreased370erTip:Whil
16、e reading a graph,youd better pay attention to the numbers.The 2 graphs are used to explain points by providing_ of global warming.evidenceEvidence or phenomenon?Question:What are the 2 graphs for?4.What do they think about global warming?Do they agree with one another?3.What are the names of the th
17、ree scientists mentioned in the article?Dr Janice Foster,Charles Keeling,George Hambley.some very different attitudesamong scientists towards this issueTask 3The different ideas between Dr.Janice Foster&George HambleyDr.Janice FosterGeorge HambleyCarbon dioxide has caused the global temperature to _
18、.An increase of five degrees would be a _ and could be _.More carbon dioxide is a _ thing,which makes crops _ and will encourage _.go upcatastrophe very seriouspositiveproducea greater range of animalsSome peopleothersThe sea level _.predict_,_,_,_,and _.rise by several metressevere stormsdroughts f
19、amines the spread of diseasesthe disppearance of speciesOther peoples ideafloodsDiscussion:What effects maybe does global warming have on the earth?Bad effects:Maybe 1.The sea level will rise.Maybe2.There will be some disasters,such asFlood!DroughtFamineForest Fire!Good effects:1.Make plants grow fa
20、ster2.Crops will produce more3.Encourage a greater range of animalsDebateABA:We shall do something about global warming.B:We shall do nothing about global warming.Agreement&Disagreement Exactly.All right.Thats right.Thats a good idea.I think so.I couldnt agree more.Thats exactly my opinion.I dont th
21、ink so.Im afraid not.Im afraid I disagree with you.Im afraid I have a different opinion.I think you are absolutely wrong.SummarySkim over the passage,and tell what you have learnt in class.Try to talk in general terms概括地；一般地说 rather than in details详细地.eg:I learnt that the earth is becoming warmer.I learnt that global warming could have terrible effects on the environment.What problems are the earth facing?Overpopulation water pollutionDeforestation and desertification采伐森林沙漠化Energy shortageOzone(臭氧）loss and air pollution
