高中英语 Unit 22 Environmental Protection Section Ⅲ Lesson 2 Lesson 3教案 北师大版选修8-北师大版高二选修8英语教案VIP免费

SectionⅢLesson2&Lesson3[学生用书P11]NatureisturningonusThelastfewyearshaveseen①environmentaldisastersonagrand②scale③，andexpertsarepredictingfarworsetocome.JinLireportsonourEarth’schangeable④weatherpatterns.AInthelastdecade,thunderstorms⑤，floods,earthquakes,typhoons⑥，volcaniceruptions,tsunamis⑦andforestfireshavebecomeincreasingly⑧common.TherehasbeenterriblefloodinginAsia,Africa,AmericaandOceania.EvenEuropehassufferedandlargeareashavebeenunderwater.Stormshavebeengetting⑨worseeverywheretoo,withagrowingnumberofhurricaneshittingtheUS⑩，andCentralAmerica.Reducedrainfall⑪hasaffectedlargeareasofAfricaforyearsleavingirrigation⑫canalsdryandmanyotherzonesarebecomingdrier.Forexample,theYellowRiver,oncefamousforflooding⑬，failedtoreachtheseaatallfor226daysin1997.Anumberof⑭nationshavealreadybeeninarmed⑮conflict⑯overwater,andreducedrainfallinthewestoftheUShasresultedin⑰hugeforestfires.BVolcaniceruptionsandearthquakeshavealwaysbeenathreat⑱incertainpartsoftheworld.Avolcaniceruptionnearlywipedout⑲thesmallislandofMontserratin1997，andtherehavebeenseriousearthquakesinmanypartsofAsia,EuropeandSouthAmerica.Inthelastthreeyears,Indonesiahashadarough⑳time,sufferingseveralkillerquakesanditisstillrecoveringfromtheAsiantsunamicausedbyanoffshoreearthquakeonDecember26th,2004.Thetsunamikilled132，000Indonesiansandanother100，000peopleofothernationalities.Thiscatastropheisstillveryfreshinthemindsofpeopleworldwidewhohavenotyetgotovertheirseparationfromlovedoneslostinthetsunami.CSowhyisnaturebeginningtoturnonus？Oneanswerisoverpopulation.Thepopulationoftheworldisgrowingatthedisturbingrateof10，000peopleanhour，nearly90millionayear,withmostofthegrowthinthedevelopingworld.Peopleinagriculturalareas,withoutanymeanstoearntheirliving,movetothecities，andthenconstructshabbyhomesfromwhatevermaterialstheycanfindonpoorclaysoil.Thesehomes,seldommadeofbricks,caneasilyfalldowninearthquakesorslipandslidedownhillinlandslides,especiallyinmountainousareas.Ontopofthat,addglobalwarming.Thishasmainlybeencausedbythehugeamountsofcarbondioxideproducedbyfactoriesandvehicles，andthedestructionoftheworld’sforests.Asaresult,ahotteroceancausesmorepowerfulwinds.Atlantichurricanes—theirhowlingwindswithspeedsofover300kilometresanhour—are40%strongernowthantheywere30yearsago.DVolcanoesandearthquakesareevenmoredangerousthaninthepastasaroundhalftheworld’spopulationnowlivesincities.Therearemorethan300activevolcanoes,aboutfiftyofwhicherupteachyear,andmorethan500millionpeoplenowlivewithintherangeofavolcaniceruption.Becausethesenaturaldisastersoccuratrandomtimes,itisdifficulttowarnpeopleinadvance.InMay2006，thousandsofIndonesianslivingnearMtMerapi(whichmeansmountainoffire)hadtofleeastheythoughtitwasabouttoerupt.Anevengreaternumberofpeopleliveatrisk,tosomedegree,fromearthquakeswhichhaveclaimedmorethan1.6millionlivesinthelasthundredyears.EMostdisasterexpertsbelievethereisthepotentialthatthingscouldgetalotworse.ProfessorHouMing,ofBeijingUniversitystudiesvolcanoesandhewarnsthattheworldhasnotseentheworstnaturecando.TheworsteruptioninhumanhistorywasprobablyMtTamborain1815,inIndonesia.DustfromthevolcanorolledacrosstheEarth’sskiesandprettymuchcancelledthefollowingsummerinEuropeandAmerica.Butevidenceshowsthat73，000yearsagotherewasamuchgreatereruption....