1、 Unit 4Global WarmingHow did come about?the snow catastrophe Some scientists believed that global warming was one of the major reasons why such extreme climate like severe storms and heavy snow frequently came about.孙广勇孙广勇造成极端天气频繁的一个重要原因就是全球变暖。造成极端天气频繁的一个重要原因就是全球变暖。Think about:What causes global war
2、ming?Human activity or a random but natural phenomenon?When we talk about this problem,we naturally link it to the use of energy and the environmental pollution.But firstly and importantly,energy makes a great difference to our lives.What things do we use energy for?We _energy to do many things in o
3、ur lives.For axample,energy _our cities and _our buildings.What other things do we use energy for?depend Things that use energy around us or at any other places:In a houseWhere does all this energy come from?Place and the related energyWind power windPlace and the related energya coal power station
4、coalPlace and the related energyoil refinery （提炼厂）（提炼厂）oilPlace and the related energynuclear power stationUranium 铀铀Place and the related energysolar panels （镶板）（镶板）solar powerPlace and the related energya hydro-electric power（与水有关的）（与水有关的）waterEnergy at home,school v Coalv Oilv Natural gasv Wind(w
5、ind power)v Sun(solar energy)v Uranium(nuclear energy)v Water(hydro-electric power)Energy at home,school sources of energyrenewable or non-renewablevNon-renewablevNon-renewablevNon-renewablevRenewablevRenewablevNon-renewablevRenewableLets try to save energy!To save energy is to save our earth!Slogan
6、slugn-n.标语标语,口号口号As we know,coal,oil and natural gas are called _,which is a kind of energy.It can make a great _to our lives.But do you know what by_ is produced when we burn fossil fuel?Is it good for our planet?What ph_ is caused by it?differenceenomenonproductfossil fuelFossil FuelFossil Fuelcoa
7、loil natural gasglobal warming Why?A greenhousegreenhouseA greenhouseis made of _ and is used for growing _,especially during _ weather.What is a greenhouse made of and used for?glassplantscoldThe air inside is warm because the glass _ the heat from the sun and keeps it from _.This makes the greenho
8、use _ and so the plants can grow _.trapsescapingheat upthroughout the cold periodHow does a greenhouse work?Now can you connect global warming with greenhouse and think of the relationship between them?Maybe you can understand why we call global warming“greenhouse effect”,right?25品质来自专业信赖源于诚信金太阳教育网金
9、太阳教育网 Whats greenhouse effect?26品质来自专业信赖源于诚信金太阳教育网金太阳教育网 greenhouse effectSurely we need greenhouse gases.Without greenhouse effect,the earth would be_.In the atmosphere surroudning the earth there are gases called“greenhouse gases”.What do you think greenhouse gases do?It is a pity that human activ
10、ity gives off extra _into the atmosphere therefore it causes_.too coldcarbon dioxideglobal warmingReadingSkim the title:THE EARTH IS BECOMING WARMER BUT DOES IT MATTER?A.The earth.B.Global warming.C.Becoming warmer doesnt matter.Who wrote the article?What is the name of the magazine?What are the nam
11、es of the 3 scientists?P 27 Ex.1 Listen to the magazine article and answer the following questions.Comprehending OneThe organization of an expositive:IntroductionA titleBodyConclusionSkim:Para.1Para.2-3Para.4-8Para.9 Match the parts with the main ideas:Match the parts with the writing skills:Page 27
12、 Ex.2 T or F1.The temperature in the last century didnt seem to increase much.2.Everyone believes that global warming is caused by the activities of humans.3.Janice Foster believes that she can measure the future global rise in temperatrue4.The rise in carbon dioxide is causing a steady in crease in
13、 global warming.5.George Hambley believes scientists are just guessing about the effects of global warming.6.It is clear what the effects of global warming will be.1.The temperature in the last century didnt seem to increase much.2.Everyone believes that global warming is caused by the activities of
14、 humans.3.Janice Foster believes that she can measure the future global rise in temperatrue T TF FLine 2:it is a rapid increase compared to most natural changes Line 5:There is doubt that 4.The rise in carbon dioxide is causing a steady in crease in global warming.5.George Hambley believes scientists are just guessing about the effects of global warming.T T T6.It is clear what the effects of global warming will be.FLine 45:No one knows We should do nothing about global warming.LOGO
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