人教版高中二年級(jí)下學(xué)期選必三 unit3 群文閱讀 workbk p78-81課件

Unit3EnvironmentalProtectionExpandingYourWorldACLEAN,GREENENERGYFUTURE人教版(2019)選擇性必修三1.Toprovideextensivereadingmaterialsandbroadenthehorizonsofstudents.2.Toinspirestudentstoreflectupontheirownexperiencesandlives.WarmingupLookatthepictureandwhatcanyouknowfromit？Whatdoyouknowaboutglobalwarming?Whatdoyouknowaboutglobalwarming?Whatcausestheglobalwarming?Thinkabout:Whentalkingaboutthisproblem,wenaturallylinkitto“GreenhouseEffect”.Howdoyouunderstand“greenhouseeffects”?Theytraptheheatfromthesun,whichcausesthetemperatureofearthgoesup.Greenhousegasesperformthesamefunctionastheglassofaglasshouse.Methane['mi:θein]

WhatareGreenhousegases?Intheatmospheresurroundingtheearththerearegasescalled“greenhousegases”,including…CarbondioxideWatervaporCarbondioxideisoneofthemostimportant“greenhousegases”.ThenegativeeffectsofglobalwarmingWhatcanwedotoreducegreenhousegasemissions?Asweallknow,globalwarmingisrelatedtotheuseofenergy.Andwedependonenergytodomanythingsinourdailylife.Somepeopleevensaywecoulddonothingwithoutenergy.

Thenwhatdoweuseenergyfor?light

thingsthatuseenergyinyourhomeairconditionerIpad

televisionhairdryer

fridge

computer

washingmachineWheredoestheenergycomefrom?Energysources:renewableandnon-renewable

sources.Renewablesources:energysourcesthatneverrunout.Non-renewable:energysourcesthatwillrunoutoneday.Windenergyisusedaspowertoproduceelectricity.

windmillsElectricityisproducedbyburningcoals.coalpowerstationsOilisrefinedandmadepure.oilrefineriesNuclearenergyisconvertedintoelectricity.nuclearpowerplantpiecesofequipmentonaroofthatcollectsenergyfromsunlightinordertoheatwaterandproduceelectricity.

solarpanelsWaterarekeptbackandraiseditslevelforirrigationorforproducingelectricity.hydro-electricdamsgeothermal

energyplantElectricityisgeneratedfromhotdryrocks.watersolarpowernuclearpoweroilcoalwindThinking:Whichsourceis“renewable”?

Anenergysourceis“renewable”whensuppliesofitneverrunoutand“non-renewable”whenonedaytheywillrunout.

non-renewablerenewableNowthatwehavelearnedsomesourcesofenergyarenon-renewableandbeharmfultotheenvironment,Whatshouldwedowithenergy?Fromtheaspectofgovernmentandcountry:Nowthatwehavelearnedsomesourcesofenergyarenon-renewableandbeharmfultotheenvironment,Whatshouldwedowithenergy?Fromtheaspectofgovernmentandcountry:Weshouldmaketheimportantchangefromfossilfuelstoclean,greenandrenewablesourcesofenergy,suchashydropower(水能),solar(太陽(yáng)能),wind,geothermal(地?zé)崮?,biofuel(生物能源).Nowthatwehavelearnedsomesourcesofenergyarenon-renewableandbeharmfultotheenvironment,Whatshouldwedowithenergy?Fromtheaspectofgovernmentandcountry:Weshouldmaketheimportantchangefromfossilfuelstoclean,greenandrenewablesourcesofenergy,suchashydropower(水能),solar(太陽(yáng)能),wind,geothermal(地?zé)崮?,biofuel(生物能源).Turnelectricalappliancesoffwhennotusingthem.Putonmoreclothes,don’tturnuptheheat.Walkorrideabike,don’tdrive.Recyclecans,bottles,plasticbagsandnewspapers.