1、 Unit 4Global WarmingHow didcome 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 warming?Human activity or a r
2、andom but natural phenomenon?When we talk about this problem,we naturally link it to the use of energy and the environmental pollution.zxxkBut 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 our lives.For axample,e
3、nergy _our cities and _our buildings.What other things do we use energy for?depend onlightsheatsThings that use energy around us or at any other places:In a houseWhere does all this energy come from?z/xxkPlace and the related energyWind power windPlace and the related energya coal power station coal
4、Place and the related energyoil refineryr：fanri:（提炼厂）oilPlace and the related energynuclear power stationUraniumjureinjm铀Place and the related energyzxx/ksolar panels（镶板）solar powerPlace and the related energya hydro-electric power（与水有关的）waterEnergy at home,school sources of energysources of energyt
5、hings using energythings using energy Lights Lights Heating Heating Television Television Cassette player Cassette player Video recorder Video recorder Computer Computer Fridge Fridge Stove Stove Washing machine Washing machine Hairdryer Hairdryer Coal Oil Natural gas Wind(wind power)Sun(solar energ
6、y)Uranium(nuclear energy)Water(hydro-electric power)Energy at home,school sources of energyrenewable or non-renewableCoalOilNatural gasWind(wind power)Sun(solar energy)Uranium(nuclear energy)Water(hydro-electric power)Non-renewable Non-renewable Non-renewable Renewable Renewable Non-renewable Renewa
7、bleLets try to save energy!To save energy is to save our earth!Sloganslugn-n.标语,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
8、 it?differenceenomenonproductfossil fuelFossil FuelCarbon dioxideFossil Fuelcoaloil natural gasglobal warming Why?Picture readingA greenhousegreenhousePicture readingA greenhouseis made of _ and is used for growing _,especially during _ weather.What is a greenhouse made of and used for?glassplantsco
9、ldThe air inside is warm because the glass _ the heat from the sun and keeps it from _.This makes the greenhouse _ 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 be
10、tween 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Whats greenhouse effect?26品质来自专业信赖源于诚信金太阳教育网greenhouse effectSurely we need greenhouse gases.Without greenhouse effect,the earth would be_.In the atmosphere surroudningthe earth there are gase
11、s called“greenhouse gases”.What do you think greenhouse gases do?It is a pity that human activity gives off extra _into the atmosphere therefore it causes_.too coldcarbon dioxideglobal warmingReadingTask 1 SkimmingSkim the title:THE EARTH IS BECOMING WARMER BUT DOES IT MATTER?What is the main topic?
12、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 names of the 3 scientists?Sophie ArmstrongEarth CareDr Janice Foster,Charles Keeling,George Hambley P 27 Ex.1 Listen to the magazine article and answer the following quest
13、ions.Comprehending OneSkimmingThe organization of an expositive:IntroductionA titleBodyConclusionSkimmingSkim the main text:Para.1Para.2-3IIIIIIPara.4-8IIIIIIPara.9IVIV Introduction BodyConclusionSkimmingMatch the parts with the main ideas:Explain how global warming comes about.List two different at
14、titudes among scientists towards global warming.Introduce a debate over global warming.Its up to readers to think and decide whether people should do something about global warming or not.I(1)II(2-3)III(4-8)IV(9)ScanningMatch the parts with the writing skills:Usinga question,leaving readers to think
15、 over the issue Raising a question Giving examples,making contrast(comparison)Giving examples,using graphs,explanationI(1)II(2-3)III(4-8)IV(9)I(1)II(2-3)III(4-8)IV(9)Page 27 Ex.2 T or F1.The temperature in the last century didnt seem to increase much.2.Everyone believes that global warming is caused
16、 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 global warming.5.George Hambley believes scientists are just guessing about the effects of global warming.6.It is clear what t
17、he 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 humans.3.Janice Foster believes that she can measure the future global rise in temperatrue TTFLine 2:it is a rapid increase co
18、mpared 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 T6.It is clear what the effects of global warming will be.FLine 45:No one knows Idea-sharingWe should do nothing about global warming.Group AGroup A2 Ss2 SsagreeagreereasonsreasonsGroup BGroup B2Ss2SsdisagreedisagreereasonsreasonsDebate
