选修 uni Global Warmingppt课件.ppt

Unit4GlobalWarming 1 2 Howdidcomeabout thesnowcatastrophe Somescientistsbelievedthatglobalwarmingwasoneofthemajorreasonswhysuchextremeclimatelikeseverestormsandheavysnowfrequentlycameabout 3 1 Readthetextcarefullyandsumupthemainideaofeachpart 2 Readthetextfastandanswerthequestionsonpage27Ex1 4 Partone para1 Introduceatopic raiseaquestion Parttwo para2 5 Explainhowglobalwarmingcomesabout Partthree para6 Listtwodifferentattitudes Partfour para7 Drawaconclusion Theearthisbecomingwarmer Shouldwedoanything 5 FastReading Readthetextfastandanswerthequestionsonpage27Ex1 6 Whowrotethemagazinearticle Whatisthenameofthemagazine SophieArmstrongwrotethemagazinearticle ThenameofthemagazineisEarthCare 7 Whatarethenamesofthethreescientistsmentionedinthearticle TheyareDr JaniceFoster CharlesKeelingandGeorgeHambley 8 3 Whatdotheythinkaboutglobalwarming Dotheyagreewithoneanother Theydon tagreewitheachother Dr JaniceFosterthinkstheeffectsofglobalwarmingcouldbeveryserious GeorgeHambleythinksglobalwarmingwillbemildwithfewbadenvironmentalconsequences 9 4 Whatarethetwographsabout Graph1showsthetemperatureincreaseofonedegreeFahrenheitbetween1860to2000 Graph2showsthecarbondioxidecontentintheatmospherefrom1957to1997 Graph1 Graph2 10 Whatisthemaintopicofthearticle Globalwarming 11 Page27Ex 2TorF 1 Thetemperatureinthelastcenturydidn tseemtoincreasemuch 2 Everyonebelievesthatglobalwarmingiscausedbytheactivitiesofhumans 3 JaniceFosterbelievesthatshecanmeasurethefutureglobalriseintemperatrue4 Theriseincarbondioxideiscausingasteadyincreaseinglobalwarming 5 GeorgeHambleybelievesscientistsarejustguessingabouttheeffectsofglobalwarming 6 Itisclearwhattheeffectsofglobalwarmingwillbe T T T T F F 12 1 Thetemperatureinthelastcenturydidn tseemtoincreasemuch 2 Everyonebelievesthatglobalwarmingiscausedbytheactivitiesofhumans 3 JaniceFosterbelievesthatshecanmeasurethefutureglobalriseintemperatrue T T F Line2 itisarapidincreasecomparedtomostnaturalchanges Line5 Thereisdoubtthat 13 4 Theriseincarbondioxideiscausingasteadyincreaseinglobalwarming 5 GeorgeHambleybelievesscientistsarejustguessingabouttheeffectsofglobalwarming T T 6 Itisclearwhattheeffectsofglobalwarmingwillbe Line45 Nooneknows 14 Summary Theearthisbecomingwarmingandallscientists theviewthattheincreaseintheearth stemperatureisduetotheburningof Some ofthisprocessarecalled themostimportantoneofwhichis Weneedthesegases buttheproblembeginswhenweaddhuge extracarbondioxideintotheatmosphere Itmeansthatmoreheatenergy tobetrappedintheatmospherecausingtheglobaltemperatureto AscientistcalledCharlesKeelingfoundthatthecarbondioxideintheatmospherewentupfromaround subscribeto fuels greenhousegases byproducts carbondioxide quantitiesof tends goup fossil 15 315partstoaround370parts millionin40years Allscientistsacceptthedateandagreetheburningofmoreandmorefossilfuelshas thisincrease However theattitudeofscientiststowardsthisriseiscompletelydifferent Ontheonehand Dr Fosterthinksthatthe whichincreasesthetemperatureby5degreeswouldbea Ontheotherhand GeorgeHambley who thisview believethatweshouldnotworryabouthighlevelsofcarbondioxideintheair Theypredictthatanywarmingwillbe withfewbadenvironmental Butnoonereallyknowstheeffectsofglobalwarming per resultedin trend catastrophe areopposedto mild consequences 16 Whatweshoulddotoprotectourearth Discussion It shightimethatwetookimmediatemeasurestoprotectourearthfrombeingpolluted 17 Tobeginwith weshouldnotthrowanyrubbishhereandthere Instead weshouldpickitup 18 Besides wearesupposedtobantheabuseofplasticbags Plasticbagscanmakewhitepollution whichmakestheenvironmentworseandworse 19 What smore weshouldstopfactoriesfromproducingharmfulgasesandwater 20 Thenweappealtootherstotakeabusorbiketogotoschoolorworksoastoreduceusingprivatecarswhichcauseairpollution 21 Finally itisgoodforustocareaboutplants Themoreplantswehave thebettertheenvironmentwillbecome 22 Tobeginwith weshouldnotthrowanyrubbishhereandthere Instead weshouldpickitup Besides wearesupposedtobantheabuseofplasticbags Plasticbagscanmakewhitepollution whichmakestheenvironmentworseandworse What smore weshouldstopfactoriesfromproducingharmfulgasesandwater Thenweappealtootherstotakeabusorbiketogotoschoolorworksoastoreduce