全球变暖课件.ppt

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1、Unit4GlobalWarmingSavetheearth!Period1&2WarmingupandReadingIWorkingroups---listthingsasrequired:1.Thingsthatuseenergyaroundusoratanyotherplaces,(ie.light)2.Sourcesofenergy(ie.coal)Warmingup–I(３m)ThingsthatuseenergySourcesofenergylightstelevisioncassetteplayercomputerfridgestovewa

2、shingmachinehairdryervideorecordercoaloilnaturalgaswind(power)sun(solarenergy)water(hydro-electricpower)thesea(tidalenergy)uranium(nuclearenergy)biomassenergyHowabouttheplants?Ifitlackssolarenergy,theplants…Greenhouse1.Whatisagreenhousemadeofandusedfor?2.Howdoesitwork?SOTheearthi

3、sbecomingwarmerandwarmerGreenhousegases!Whataregreenhousegases?What’sgreenhouseeffect?What’swrongwithourearth?methaneCarbondioxideWatervapourGreenhouseEffectpartMainideaPart1(paragraph___)Part2(paragraphs__to__)Part3(paragraph__)Part4(paragraph___)It’suptoreaderstothinkanddecidew

4、hetherpeopleshoulddosomethingaboutglobalwarmingornotIntroduceadebateovertheissueofglobalwarmingShowhowglobalwarmingcomesaboutListtwodifferentattitudesamongscientiststowardsglobalwarming12567Howhasglobalwarmingcomeabout?HumanactivityburningoffossilfuelsGreenhousegasesGreenhouseeff

5、ectweneedthosegasesHugequantitiesofextracarbondioxideWhataretheeffectsofglobalwarming?causethesealeveltoriseseverestormsdroughtsfaminesthespreadofdiseasesdestructionofspeciesPositiveeffectsNegativeeffectsmakeplantsgrowfastercropswillproducemoreagreaterrangeofanimalsmakelifebetter

6、Readingaloudandunderlining…..comeabout,Thereisnodoubtthat...,subscribeto,dueto,greenhouseeffect,quantitiesof,tendto,betrappedin,goup,resultin,ontheonehand...ontheotherhand,beopposedto,buildup,keepon.DiscussionWhatshouldwedoaboutglobalwarming?Thankyou