选修6-global-warming-单元课件.ppt

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1、Unit4GlobalWarmingwarming-up&ReadingEnergysources?Internationalrelations?Money?Technology?Whichisthemostimportanttoacountry?…Manpower?energysourcesWedependonenergytodomanythingsinourdailylives.Forexample,energylightsourcitiesandheatsourbuildings.Makealistof

2、thingsthatuseenergyinyourhome,inyourschool,oranyotherplacesyoucanthinkof.stovelightthingsthatuseenergyinyourhomemicro-waveovencassetteplayerheatingtelevisionhairdryervideoplayerfridgecomputerwashingmachinestoveWindenergyisusedaspowertoproduceelectricity.Win

3、dmillswhereelectricityisproducedbyburningcoals.Thecoalpowerstationsafacilitydesignedtoconvertnuclearenergyintoelectricity.Anuclearpowerplantontheroofofahouseonabrightsunnydayareusedtocollectsolarenergy,makingyourhousewarmorheatingyourwater.Solarpanelsareuse

4、dtokeepbackwaterandraiseitslevelforirrigationorforproducingelectricity,etc.TheHydro-electricdamsGuessit!UraniumOre(铀矿石)Theelementuraniumdoesnotoccurinpureforminnaturebutisfoundinmineralssuchascarnotite（钒钾铀矿）,picturedhere.Whatsourceofenergy?Geysers(间歇泉)Geoth

5、ermal(地热的)EnergyPlantAnenergysourceis“renewable”whensuppliesofitneverrunoutand“non-renewable”whenonedaytheywillrunout.Whichenergysourcesonyourlistarerenewableandwhicharenon-renewable?Discussnon-renewablerenewableWhatarethesebuildingsmadeofandwhataretheycall

6、ed?What’stheuse?glass/greenhouseAgreenhouseisusedforgrowingplants,especiallyduringcoldweather.Theglasstrapstheheatfromthesun,makingtheairwarmsothatplantscangrowbetter.trap…from…:keepsthinaplace存住…中的…HowdoesitworkGreenhousegases?Intheatmospheresurroundingthe

7、earththerearegases,whicharecalled“greenhousegases”,mainlyincluding____________,andwatervapor(水蒸气).carbondioxideCarbondioxideMethaneWatervaporWhatdoyouthinkgreenhousegasesdo?Greenhousegasesperformthesamefunctionasthe______inagreenhouse---They______theheatoft

8、hesunandtherefore_______theearth.Itisknownas___________________.Nowadaysourearthisbecoming___________________.greenhouseeffecttrapwarmwarmerandwarmerglassP26TheEarthisBecomingWarmer---ButDoesItMatter?