gas vs electric cars carbon footprint：气与电动汽车的碳足迹

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1、GasversusElectricCars:CarbonFootprintInstructorNotesThisactivitydevelopssomeunderstandingandexperiencecomputingfueleconomyandcarbonemissionsofgasversuselectricautos,withashortsectionalsoincludedonthecarbonemissionsassociatedwithridingabike.Belowareexamplesofhowtomakethesecalculations,ando

2、nPage3isasamplestudentactivity.1.Gas-poweredvehicleIntheU.S.weusemilespergallonasameasureofthefueleconomyofacar.Fromthis,wecancalculatetheassociatedcarbonemissionsusingthefollowingmethod.Data:AveragefueleconomyofChevyCobalt:26milespergallon(mpg)Averagenumberofmilesdrivenperyear:12,000mile

3、sCarbonemissionspergallonofgasused:19.6lbsofCO2Method:Numberofgallonsofgasperyear:12,000miles/(26milespergallon)=462gallonsCarbonemissionsperyear:462gallons*19.6=9055lbsofCO2peryearDrivingagas-poweredcarproduces9,055lbsofCO2emissionsperyearTomaketheconnectionbetweendrivingandcarbonemissio

4、nsclearer,wecancharacterizeanautobytheamountofCO2emissionspermile,wherethesmallerthenumberthemoreefficientandlesspollutingthecaris.So,fortheaboveChevyColt,wecandividethe9055lbsofCO2bythe12,000milesdriventoget:0.75lbsofCO2/mileThenicepartofthiswayofmeasurefueleconomyisthatwecanthendirectly

5、comparegaspoweredcarswithelectricautosandevenbicycles.2.ElectricVehicles:Topoweranelectricvehicleoneusestheirlocalelectricityprovidertochargebatteriestorunthecar.Thecarbonemissionsassociatedwiththeelectricitygenerationdependsonhowtheelectricitywasproduced.Ifyougenerateelectricityusingacoa

6、l-firedpowerplant,thatemitsalotofcarbonemissionscomparedtoelectricitygeneratedfromothersourcessuchasnaturalgas,hydroelectricsourceswindandsolar.Belowisalistofthecarbonemissionsforelectricitygenerationindifferentstates,giveninunitsofCO2emissionsperkWhofelectricity(kWhisaunitofenergytypical

7、lyusedforhomeenergyuse).California0.61(CO2lbsperkWhofelectricity)Colorado1.93(CO2lbsperkWhofelectricity)NorthDakota2.24(CO2lbsperkWhofelectricity)USAverage1.34(CO2lbsperkWhofelectricity)So,thentocalculatethecarbonfootprintofdrivingelectricauto,weneedtoknowhowmuchele