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1、专业八级分类模拟46READINGCOMPREHENSIONHumansaredamagingtheplanetatanunprecedentedrateandraisingrisksofabruptcollapsesinnaturethatcouldspurdisease,deforestationorndeadzones"intheseas,aninternationalreportsaidonWednesday.Thestudy,by1,360expertsin95nations,saidarisinghumanpopulat
2、ionhadpollutedorover-exploitedtwo-thirdsoftheecologicalsystemsonwhichlifedepends,rangingfromcleanairtofreshwater,inthepast50years."Attheheartofthisassessmentisastarkwarning,Hsaidthe45-memberboardoftheMillenniumEcosystemAssessment•nHumanactivityisputtingsuchstrainonthen
3、aturalfunctionsofEarththattheabilityoftheplanet'secosystemstosustainfuturegenerationscannolongerbetakenforgranted,"itsaid•Tento30percentofmammal,birdandamphibianspecieswerealreadythreatenedwithextinction,accordingtotheassessment,thebiggestreviewoftheplanet1slifesupport
4、systems.n0verthepast50years,humanshavechangedecosystemsmorerapidlyandextensivelythaninanycomparabletimeinhumanhistory,largelytomeetrapidlygrowingdemandsforfood,freshwater,timber,fibreandfuel,11thereportsaid."Thishasresultedinasubstantialandlargelyirreversiblelossinthed
5、iversityoflifeonearth,nitadded.Morelandwaschangedtocroplandsince1945,forinstance,thaninthe18thand19thcenturiescombined.11Theharmfulconsequencesofthisdegradationcouldgrowsignificantlyworseinthenext50years,nitsaid.Thereportwascompiledbyexperts,includingfromUNagenciesandi
6、nternationalscientificanddevelopmentorganizations•UNSecretary-GeneralKofiAnnansaidthestudynshowshowhumanactivitiesarecausingenvironmentaldamageonamassivescalethroughouttheworld,andhowbiodiversity—theverybasisforlifeonearth—isdecliningatanalarmingrate•nThereportsaidther
7、ewasevidencethatstrainsonnaturecouldtriggerabruptchangeslikethecollapseofcodfisheriesoffNewfoundlandinCanadain1992afteryearsofover-fishing.Futurechangescouldbringsuddenoutbreaksofdisease.WarmingoftheGreatLakesinAfricaduetoclimatechange,forinstance,couldcreateconditions
8、foraspreadofcholera.Andabuild-upofnitrogenfromfertilizerswashedofffarmlandintoseascouldspurabruptbloomsofalgaethatcho
