E
Wealreadyknowthefastest,leastexpensivewaytoslowclimatechange:Uselessenergy.Withalittleeffort,andnotmuchmoney,mostofuscouldreduceourenergydietsby25percentormore—doingtheEarthafavorwhilealsohelpingourwallets.
Notlongage.Mywife,PJ,andItr iedanewdiet—nottolosealittleweightbuttoansweranannoyingquestionaboutclimatechange.Scientistshavereportedrecentlythattheworldisbendingupevenfasterthanpredictedonlyafewyearsago,andthattheconsequencescouldbesevereifwedon’tkeepreducingemissions（排放）ofcarbondioxide（CO2）andothergreenhousegasesthataretr appingheatinouratmosphere.
Wedecidedtotr yanexperiment.ForonemonthwerecordedourpersonalemissionsofCO2..Wewantedtoseehowmuchwecouldcutback,sowewentonastr ictd iet.TheaverageUShousehold（家庭）producesabout150poundsofCO2adaybydoingcommon-placethingsliketurningonair-conditioningordrivingcars.That’smorethantwicetheEuropeanaverageandalmostfivetimestheglobalaverage,mostlybecauseAmericansdrivemoreandhavebiggerhouses.Buthowmuchshouldwetr ytoreduce?
Forananswer,IcheckedwithTimFlannery,authorofTheWeatherMakers:HowManIsChangingtheClimateandWhatItMeansforLifeonEarth.Inhisbook,hehadchallengedreaderstomakedeepcutsinpersonalemissionstokeeptheworldfromreachingextr emelyimportanttippingpoints,suchasthemelting（融化）oftheicesheetsinGreenlandorWestAntarctica.“Tostaybelowthatpoint,weneedtoreduceCO2emissionsby80percent,”hesaid.
Goodadvice,Ithought.I’dopenedourbedroomwindowstoletinthewind.We’dgottensousedtokeepingourair-conditioninggoingaroundtheclock.I’dalmostforgottenthewindowsevenopened.Weshouldnotletthishappenagain.It’stimeforustochangeourhabitsifnecessary.
72.Whydidtheauthorandhiswifetr yanewdiet?
A.TotakespecialkindsoffoodB.Torespondtoclimatechange.
C.ToloseweightD.Toimprovetheirhealth
正确答案：B
