新人教选修6 Unit4 Global warmingReading课件.ppt

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1、ReadingWhatisthegreenhousemadeandusedfor?Agreenhouseismadeofglassandisusedforgrowingplants,especiallyduringcoldweather.Howdoesitwork?Theairinsideiswarmbecausetheglasstrapstheheatfromthesunandkeepsitfromescaping.Thismakesthegreenhouseheatupandsotheplantscangrowthroughoutthecoldperiod.

2、Whatarethe“greenhousegases”?Intheatmospheresurroundingtheearththerearegases,whicharecalled“greenhousegases”,includingcarbondioxide,methane(甲烷,沼气)andwatervapor.Whatdoyouthinkgreenhousegasesdo?Theytrapheatfromthesunandthereforewarmtheearth.MainideasofeachpartWritingtechniques(Paragraph

3、1)Introduceadebateovertheissueofglobalwarming.RaisingaquestionReadingMainideasofeachpartWritingtechniques(Paragraphs2---3)Illustratehowglobalwarmingcomesabout.Givingexamples,usinggraphs,explanation.(Paragraphs4---5)Listtwodifferentattitudesamongscientiststowardsglobalwarming.Givingex

4、amples,makingcontrast.(Paragraph6)It'suptoreaderstothinkanddecidewhetherpeopleshoulddosomethingaboutglobalwarmingornot.Usingaquestion,leavingreaderstothinkovertheissue.Readthetextcarefullyandfillintheblanks.ScientistsOpinionJaniceFoster◆Weneed1______likecarbondioxide,methaneandwaterv

5、apour,butifweaddhuge2__________extracarbondioxidetotheatmospherebyburningfossilfuels,itwillcausethe3________________togoup.gasesquantitiesofglobaltemperatureScientistsOpinionJaniceFoster◆Overthenext100yearstheamountofwarmingcouldbeaslowas1to1.5degreesCelsius,butitcouldbeashighas5degr

6、eesCelsius.◆Anincreaseoffivedegreeswouldbea4____________.catastropheScientistsOpinionsGeorgeHambley◆Believesthatweshouldn’tworryabout5__________ofcarbondioxideintheair.◆Predictsthatanywarmingwillbemildwithfewbadenvironmental6___________.◆7_______thatmorecarbondioxideisactuallya8_____

7、___thing,whichwillmakelifeforhumanbeingsbetter.highlevelsconsequencesStatespositiveChoosethebestanswers.1.WhichofthefollowingisTRUEaccordingtothetext?A.ThetemperatureoftheearthincreasedaboutonedegreeFahrenheitduringthe20thcentury.B.Thecarbondioxidecontentintheairincreasedby70partsper

8、millionfrom1