题目内容：
根据录音，回答题 Lookingatthebasicbiologicalsystems,theworldisnotdoingverywell．Yeteconomicindicatorsshowtheworldis26Despiteaslowstartatthebeginningoftheeighties,globaleconomicoutputincreasedbymorethanafifthduringthe27Theeconomygrew,tradeincreased,andmillionsofnewjobswerecreated．Howcanbiologicalindicatorsshowthe28ofeconomicindicators?
Theansweristhattheeconomicindicatorshaveabasicfault:theyshownodifferencebetweenresourceusesthat29progressandthoseusesthatwillhurtit．Themainmeasureofeconomicprogressisthegrossnationalproduct(GNP)．30,thistotalsthevalueofallgoodsandservicesproducedandsubtractslossinvalueoffactoriesandequipment．Developedahalf-centuryago,GNPhelped31acommonwayamongcountriesofmeasuringchangeineconomicoutput．Forsometime,thisseemedtowork32well,butseriousweaknessesarenowappearing．Asindicatedearlier,GNPincludeslossinvalueoffactoriesandequipment,butitdoesnot33thelossofnaturalresources,includingnonrenewableresourcessuchasoilorrenewableresourcessuchasforests．
Thisbasicfaultcanproducea34senseofnationaleconomichealth．AccordingtoGNP,forexample,countriesthatovercutforestsactuallydobetterthanthosethatpreservetheirforests．Thetreescutdownarecountedasincomebutnosubtractionismadefor35theforests．
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