TheWashington-basedthinktank's（智囊机构的）"VitalSigns2007-2008"reportpointsoutglobalpatternsrangingfromrisingmeatconsumptiontoAsianeconomicgrowtharelinkedtothebroaderproblemofclimatechange．"Ithinkclimatechangeisthemosturgentchallengewehaveeverfaced，"saidErikAssadourian，directoroftheVitalSignsproject．"Youseemanytrendsinclimatechange，whetherwearetalkingaboutgrainproductionwhichisaffectedbydroughtsandflooding．Ormeatproductionaslivestockproductionmakesupabout20percentofgreenhousegasemissions（排放），"hetoldreportersinatelephoneinterviewbeforethereport'srelease．

Assadouriansaidthekeymessageofthereportwasthatunsustainableconsumptionpatternswereresponsibleforclimatechangelinkedtocarbonemissions andotherecologicalwoes．Hesaidofthe44trendstrackedbythereport，28were"pronouncedlybad"andonlysixwerepositive．Thetrendsrangefromthespreadofavianflu（禽流感）totheriseofcarbonemissionstothenumberofviolentconflicts．Thegrowinguseofwindpowerisamongthefewtrendsseenaspositive．

Someofthepointshighlightedinthereportinclude：

--Meatproductionhitarecord276millionmetrictons（43kilogramsor95poundsperperson）in2006．

--Meatconsumptionisoneofseveralfactorsdrivingrisingsoybeandemand．RapidexpansionofsoybeanplantationsinSouthAmericacoulddisplace（挤走）22millionhectares（54millionacres）oftropicalforestandsavanna（热带草原）inthenext20years．

--Theriseinglobalseafoodconsumptioncomesasmanyfishspeciesbecomescarcer．

Otheranalystsandthinktankshavefocusedondifferenttrendstheysaymeanlesscauseforalarm．Forexample，theypointoutthatwhilemorewoodisbeingremovedfromforestsonaglobalscale，manypartsofEuropeandNorthAmericahaveexperiencedreforestationinrecentdecades．

53．Thebesttitleforthispassagewouldbe___．

A．GreenhouseGasEmissions B．GlobalConsumptionPatterns

C．ConsumptionandClimateChange D．EconomicGrowthandCarbonEmissions

54．"VitalSigns2007-2008"reportmainlyconcernsabout___．

A．howt