选修六Unit4-Globalwarming]教学内容.ppt

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1、Unit4GlobalWarmingTheeffectsofglobalwarmingNegativeeffects:1causethesealeveltorise;2severestorms;3droughts;4famine;5destructionofspecies6floodTheeffectsofglobalwarmingPositiveeffects:1makeplantsgrowfaster;2cropswillproducemore;3makelifebetterEnergyso

2、urces?Internationalrelations?Money?Technology?Whichisthemostimportanttoacountry?…Manpower?energysourcesWedependonenergytodomanythingsinourdailylives.Forexample,energylightsourcitiesandheatsourbuildings.Makealistofthingsthatuseenergyinyourhome,inyours

3、chool,oranyotherplacesyoucanthinkof.stovelightthingsthatuseenergyinyourhomemicro-waveovencassetteplayerheatingtelevisionhairdryervideoplayerfridgecomputerwashingmachinestoveWindenergyisusedaspowertoproduceelectricity.Windmillswhereelectricityisproduc

4、edbyburningcoals.Thecoalpowerstationsinwhichoilisrefinedandmadepure.TheOilRefineriesafacilitydesignedtoconvertnuclearenergyintoelectricity.Anuclearpowerplantontheroofofahouseonabrightsunnydayareusedtocollectsolarenergy,makingyourhousewarmorheatingyou

5、rwater.Solarpanelsareusedtokeepbackwaterandraiseitslevelforirrigationorforproducingelectricity,etc.TheHydro-electricdamsAnenergysourceis“renewable”whensuppliesofitneverrunoutand“non-renewable”whenonedaytheywillrunout.Whichenergysourcesonyourlistarere

6、newableandwhicharenon-renewable?DiscussionCoalOilNaturalgasUranium[化]铀(nuclearenergy)FossilfuelsNon-renewableWind(windpower)Sun(solarenergy)Water(hydro-electricpower)Plantwaste植物性废物(biomassenergy生物团能量)Hotspringsorgeysers间歇泉(geothermalenergy)Thesea(ti

7、dalenergy潮汐能)RenewableWhatarefossilfuels?FossilfuelsareAncientanimalandplantmaterialbelowthesurfaceoftheearthwithahighcarboncontent,suchascoal,oilandnaturalgas,whichcanbeburnttoproduceenergy.Theyarealsoknownasnon-renewableenergybecauseoncetheyareruno

8、utof/runout,theycannotberenewed.Whatarethesebuildingsmadeofandwhatistheirpurpose?Theyaremadeofglassandplantscangrowinitwhenitiscoldoutside.Howdoesitwork?Theglasstrapstheheatfromthesun,makingtheairwarmsothatplantscangrowbetter.Greenhousegases!What’sgr