高中英语Unit 4 global warming课件人教版选修六.ppt

unit4globalwarming energysources internationalrelations money technology whichisthemostimportanttoacountry manpower stove light thingsthatuseenergyinyourhome micro waveoven cassetteplayer heating television hairdryer videoplayer fridge computer washingmachine stove listthingsthatuseenergyaroundusoratanyotherplaces ie light windmills acoalpowerstation theoilrefineries anuclearpowerplant solarpanels thehydro electricdams whatsourceofenergy geysers 间歇泉 geothermal 地热的 energyplant renewableornon renewable renewableornon renewable whatistoldinthepicture whatarethey 1 whatisagreenhousemadeofandusedfor 2 howdoesitwork agreenhouseismadeofglassandisusedforgrowingplants especiallyduringcoldweather howdoesitwork theairinsideiswarmbecausetheglasstrapstheheatfromthesunandkeepsitfromescaping thismakesthegreenhouseheatupandsotheplantscangrowthroughoutthecoldperiod sotheearthisbecomingwarmerandwarmer what swrongwithourearth methane carbondioxide watervapour greenhouseeffect whatarethe greenhousegases carbondioxide methaneandwatervapor whatdoyouthinkgreenhousegasesdo theytrapheatfromthesunandthereforewarmtheearth reading theearthisbecomingwarmer butdoesitmatter p26 thisarticleisfrom amagazinetheinternetabook atitle afirstparagraphthatisinbold themaintextintwonarrowcolumns twographs twoquotes pre reading fastreading glanceandanswer whowrotethemagazinearticle whatisthenameofthemagazine 2 whatarenamesofthethreescientistsmentionedinthetext 3 whatisthemaintopicofthearticle whowrotethemagazinearticle whatisthenameofthemagazine sophiearmstrong thenameofthemagazineisearthcare dr janicefoster 2 whatarethenamesofthethreescientistsmentionedinthearticle charleskeeling georgehambley 3 whatisthemaintopicofthearticle globalwarming carefulreading 1 howhastheglobalwarmingcomeabout 2 whataretheeffectsofglobalwarming 1 howhasglobalwarmingcomeabout thereisafiercedebateoverit humanactivityjustanaturalphenomenon drjanicefoster humanactivity burnigoffossilfuels greenhouseeffect greenhousegases weneedthosegases fromaround315partspermilliontoaround370partspermillion hugequantitiesofextracarbondioxide from1957to1997 2 whataretheeffectsofglobalwarming doesitmatter carefulreading positiveeffects negativeeffects maybe thesealevelwillrise maybe therewillhavesomedisasters suchas flood drought famine forestfire causethesealeveltoriseseverestormsdroughtsfaminesthespreadofdiseasesdestructionofspecies positiveeffects negativeeffects makeplantsgrowfastercropswillproducemoreagreaterrangeofanimalsmakelifebetter georgehambley theearthisbecomingwarmer butdoesitmatter yes no p26 dicussion theearthisbecomingwarmer inyouropinion doesitmatter ifitdoes asastudent whatcanyoudoaboutit trueorfalse readthearticlecarefullyandfinishpart2onpage27 1 thetemperaturelastcenturydidn tincreasemuch 2 everyonebelievesthatglobalwarmingiscausedbytheactivitiesofhumans 3 janicefosterbelievesthatglobalwarmingiscausedbyburningfossilfuels f f t p1 itisarapidincreasecomparedtomostnaturalchanges p2 thereisfiercedebateoverit 4 naturalgasisagreenhousegas 5 carbondioxideisabyproductofburningfossilfuels f t p3 fossilfuels coal naturalgasandoil 6 peopleacceptcharleskeeling sdatabecausehetookaccuratemeasurements t 7 floodingcouldbeoneoftheeffectsoffutureglobalwarming 8 georgehambleybelievesscientistsarejustguessingabouttheeffectsofglobalwarming 9 georgehambleyisworriedabouttheeffectsofcarbondioxideonplantgrowth 10 itisclearwhattheeffectsofglobalwarmingwillbe t t f f p10 positive p11 nooneknows p10 speculation theauthorprobablyagreesthat a actuallyglobalwarmingisgoodforman b weshou