辽宁省北票市高级中学人教版高中英语选修六课件：UNIT 4 GLOBAL WARMING-WARMING UP .ppt

1、Unit 4-warming up and readingGlobal 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“自然现象”。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生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，

2、也就是常说的“温室效应”。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，既危害自然生态系统的平衡，更威胁人类的食物供应和居住环境。Now,lets 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 t

3、hat use energy in your home,in your school,or any other places you can think of.stove 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.Windmills

4、where 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 power plant on the roof of a house on a bright sunny day are used to collect solar energy,making your

5、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.Guess it!Uranium Ore(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）,pic

6、tured here.What source of energy?Geysers(间歇泉)Geothermal(地热的)Energy PlantAn 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-r

7、enewablecoaloilnatural gaswind(wind power)sun(solar energy)uranium(nuclear energy)water(hydro-electric power)plant waste(biomass energy)geothermal energythe sea(tidal energy)non-renewablenon-renewablenon-renewablerenewablerenewablenon-renewablerenewablerenewablerenewablerenewablePre-readingWhat is t

8、he greenhouse made and used for?greenhouseThey are made of glass and 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 sam

9、e 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 Earth Is Becoming Warmer But Does It Matter?Fast ReadingGlance at the article and answer these questions.Sophie Armstrong wrote the magazine artic

10、le.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 global warming?Do they agree with

11、 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 degree Fahrenheit between 1860 to

12、 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 is caused by the activities of

13、 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 carefully.Tell true or false.T

14、TFTTFDetailed-Reading Read the article in details and finish the following 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.George Hambley.D.Sophie Armstrong.Listen to the reading passage and do some choices.2.But t

15、here 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 the election campaign.C.The government is expected to issue a statement about the elec

16、tion.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 keeps on warming.D.a lot remains to be found out about the effects of global warming.Questi

17、onnaires-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 come about?Human activity-burning of fossil fuels.Greenhouse effect-greenhouse gases-we n

18、eed 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 animals.The sea level to rise.Severe storms,droughts,famines,the spread of diseases,and de

19、struction 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 comes aboutList two different attitudes among scientists towards global warmingIts up to

20、 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)points by providing evidence.2.What are the diagrams for?Questionnaires-II3.Why are there two quotes?Because the

21、y 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 the reader to reflect on the major theme of the text and to predict what might happen in

22、 the future.4.What is the purpose of the last paragraph of the article?The different ideas between Dr.Janice Foster&George HambleyDr.Janice FosterGeorge HambleyCarbon dioxide has caused the global temperature to _.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 Prepare the language points of this passage and underline the important ones.Review the reading passage.Finish useful words and expressions.