高二英语（人教版选修6）教学精品课件：unit 4 period ⅰ.ppt

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1、教师用书独具演示演示结束Duringthe20thcenturythetemperatureoftheearthroseabout1.degreeFahrenheit.Theburningof2.likecoal，naturalgasandoiltoproduceenergy.Thelevelsofcarbondioxidehave3．greatlyoverthelast100to150years.CharlesKeelingfoundthatthecarbondioxideintheatmosp

2、herewentupfromaround4.partstoaround370partspermillionbetween1957and1997.DrJaniceFostersaysthattheamountofwarmingcouldbeaslowas1to1.5degreesCelsius，butitcouldbeashighas5degreesoverthenext5.years.TheclimatecouldbeveryseriousAriseofseveralmetresinthe6.．S

3、everestorms，floods，7．，famines.Thespreadofdiseases.Thedisappearanceof8.．Weshouldnotworryabouthighlevelsofcarbondioxideintheair.Itwillmakeplantsgrow9.；cropswillproduce10.；itwillencourageagreaterrangeofanimals.