北师大版高中英语选择性必修第一册UNIT 3课件.ppt

**UNIT3CONSERVATION美文导入素养解读：《普通高中英语课程标准》要求对学生进行文化素质的培养。文化素质的培养主要是指通过英语教学使学生扩大视野，认识地球和我们所生活的环境，弄清地球的自然资源，把握能源革命的最新发展。通过对本单元课文的学习，同学们要学会在日常生活和学习过程中，注意节约能源，自觉地保护环境，养成良好的环保意识。主题：生物能源学科素养：人与自然难度系数：★★★SeaweedasFutureSourceofFuelandFoodSeaweedhasmanybenefits；itmayreplaceplasticasafuturesourceoffuelandfood.Seaweedisclassifiedasalgae.Itisfastgrowing，usesenergyfromthesun，andconsumescarbondioxideandnutrientsfromseawater.Scientistsaresuggestingthatseaweedmaybeabletohelpmitigate(减少；缓解)carbonemissionsandclimatechange.Aseaweedcultivationrigisfixedtotheseafloor.Ithasropesthatarelatticed(制成网格的)andhavelengthsof50,000metresor164,000feet.Thestringsaredesignedsothattheycanwithstandlargeandroughwaves.AccordingtoseaweedproducerandOceanRainforestmanagingdirectorMrGregarsen，therig’smainstructuregoesdown10metrestoavoidlargebreakingwaves.TheyhavecultivationareasintheNorthAtlanticinDenmark’sterritory(领土，领域).AccordingtoMrGregarsen，thesiteisrichinnutrientsandhasdeepwaters.Also，itstemperaturerangesfrom6to11℃.Allofthesefactorsmaketheareaidealforseaweedgrowth.Thisyear，theywillbegettinginabout200tons.Gregarsen’sgroupisoneofmanyseaweedfarmssetupinNorthAmericaandEuropeduetoincreasingdemandfromvariousindustries，includingthefoodsector.Itisgainingdemandbecauseitcanbeusedasfeedandfood，anditcanalsoreplacefossilfuel-basedplasticpackagingproducts.OceanRainforesthasrecentlybeenfundedbytheUSDepartmentofEnergytocopyitsDanishsystemandbuildasimilarCaliforniaone.Californiawantstostartindustrialisedproductionforuseasbiofuels(生物燃料).Gregarsen’scompanyisplanningondoublingproductionthisyear.Theyareplanningtomechanisetheirproductionandmaketheiroperationlarge-scaleandmoreefficient.Gregarsensaysonlyafewcompaniescanmakeseaweedaprofitablevent