教育专题：人教新课标选修六Unit4Globalwarming-Warmingup&Reading[课件].ppt

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1、Unit 4 Unit 4-warming up and readingGlobal warmingGlobal warming Is the whole world becoming warmer and warmer?Why?populationair pollutioncarbon dioxideAcid rainSpecies extinctionWater pollution 全球气候变暖是一种全球气候变暖是一种“自然现象自然现象”。人们焚烧。人们焚烧化石矿物以生成能量或砍伐森林并将其焚烧时会产化石矿物以生成能量或砍伐森林并将其焚烧时会产生二氧化碳等多种温室气体。这些温室气体对来自生

2、二氧化碳等多种温室气体。这些温室气体对来自太阳辐射的可见光具有高度的透过性，而对地球反太阳辐射的可见光具有高度的透过性，而对地球反射出来的长波辐射具有高度的吸收性，能强烈吸收射出来的长波辐射具有高度的吸收性，能强烈吸收地面辐射中的红外线，导致全球气候变暖，也就是地面辐射中的红外线，导致全球气候变暖，也就是常说的常说的“温室效应温室效应”。全球变暖会使全球降水量重。全球变暖会使全球降水量重新分配、冰川和冻土消融、海平面上升等，既危害新分配、冰川和冻土消融、海平面上升等，既危害自然生态系统的平衡，更威胁人类的食物供应和居自然生态系统的平衡，更威胁人类的食物供应和居住环境。住环境。Now,lets

3、enjoy a short video about global warming.Its funny and grieved.energy sourcesWe depend on energy to do many things in our daily lives.For example,energy lights our cities and heats our buildings.Make a list of things that use energy in your home,in your school,or any other places you can think of.st

4、ove light things that use energy in your home micro-wave oven cassette player heating television hairdryer video player fridge computer washing machine stoveWind energy is used as power to produce electricity.Windmillswhere electricity is produced by burning coals.The coal power stationsin which oil

5、 is refined and made pure.The Oil Refineriesa facility designed to change nuclear energy into electricity.A nuclear power 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 k

6、eep back water and raise its level for irrigation or for producing electricity,etc.Guess it!Uranium Ore(铀矿石铀矿石)The element uranium does not occur in pure form in nature but is found in minerals such as carnotite（钒钾铀矿钒钾铀矿）,pictured here.What source of energy?Geysers(间歇泉间歇泉)Geothermal(地热的地热的)Energy Pl

7、ant An energy source is“renewable”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?DiscussSources of energyRenewable/non-renewablecoaloilnatural gaswind(wind power)sun(solar energy)uranium(n

8、uclear energy)water(hydro-electric power)plant waste(biomass energy)geothermal energythe sea(tidal energy)non-renewablenon-renewablenon-renewablerenewablerenewablenon-renewablerenewablerenewablerenewablerenewablePre-readingWhat is the greenhouse made and used for?greenhouseThey are made of glass and

9、 plants can grow in it when it is cold outside.How does it work?The glass traps the heat from the sun,making the air warm so that plants can grow better.Greenhouse gases!Whats greenhouse gases effect?Greenhouse gases perform the same function as the glass in a greenhouse -They trap the heat of the s

10、un and keep the air surrounding the earth warm.It is called the greenhouse effect.The Earth Is The Earth Is Becoming Warmer Becoming Warmer But Does It But Does It Matter?Matter?Fast ReadingGlance at the article and Glance at the article and answer these questions.answer these questions.Sophie Armst

11、rong 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.1.Who wrote the magazine article?What is the name of the magazine?3.What do they think about glob

12、al 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.4.What are the two graphs about?Graph 1 shows the temperature increase of one degr

13、ee Fahrenheit between 1860 to 2000.Graph 2 shows the carbon dioxide content in the atmosphere from 1957 to 1997.Graph 1:Graph 2:5.What is the main topic of the article?Global warming/The warming of the earth.1.The temperature last century didnt increase much.2.Everyone believes that global warming i

14、s 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 a byproduct of burning fossil fuels.6.People accept Charles Keelings data because he took accurate measurements.Read the article c

15、arefully.Tell true or false.TTFTTFDetailed-Reading Read the article in details Read the article in details and finish the following and finish the following task.task.listening1.Who found out the amount of carbon dioxide in the atmosphere from 1957 to 1977?A.Dr.Janice Foster.B.Charles Keeling.C.Geor

16、ge Hambley.D.Sophie Armstrong.Listen to the reading passage and do some choices.2.But there are some very different attitudes among scientists towards this issue.”“issue here means the same as the one in_.A.I bought the new stamp the day of its issue.B.They are talking about one of the key issues in

17、 the election campaign.C.The government is expected to issue a statement about the election.D.The magazine has 12 issues each year.3.The author probably agrees that _A.actually global warming is good for man.B.we should do nothing about the global warming.C.catastrophes will happen if the globe keep

18、s on warming.D.a lot remains to be found out about the effects of global warming.Questionnaires-I1.Does Sophie Armstrong support a clear opinion?2.Does George Hambley believe that we should worry much about the global warming?No.he doesnt state it clearly.No,he doesnt.3.How has the global warming co

19、me about?Human activity-burning of fossil fuels.Greenhouse effect-greenhouse gases-we need those gases.Huge quantities of extra carbon dioxide-from 1957 to 1997-from around 315 parts per million to around 370 parts per million.4.What are the effects of global warming?Encourage a greater range of ani

20、mals.The sea level to rise.Severe storms,droughts,famines,the spread of diseases,and destruction of species.Make plants grow faster.Crops will produce more.main ideaPart1(para1)Introduce a debate over the issue of global warmingPart 2(para2)Part 3(para3-8)Part 4(para9)Illustrate how global warming c

21、omes aboutList two different attitudes among scientists towards global warmingIts up to readers to think and decide whether people should do sth about global warming or not 4 parts1.What is the purpose of the paragraph that is in bold?To introduce the topic.To illustrate(阐述阐述)points by providing evi

22、dence.2.What are the diagrams for?Questionnaires-II3.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 therefore to make you interested enough to read the whole article.It functions as a conclusion by asking

23、 the reader to reflect on the major theme of the text and to predict what might happen in the future.4.What is the purpose of the last paragraph of the article?The different ideas between Dr.Janice Foster&George Hambley Dr.Janice FosterGeorge HambleyCarbon dioxide has caused the global temperature t

24、o _.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 animalsHomework Homework Prepare the language points of this passage and underline the important ones.Review the reading passage.Finish useful words and expressions.