Passage2 Americansdon’tliketolosewars．Ofcourse，alotdependsonhowyoudefinejustwhatawaris．Thereareshootingwars—thekindthattestpatriotismandcourage--andthosearethekindatwhichtheU．S．excels．Butotherstrugglestestthosequalitiest00．WhatelsewastheGreatDepressionorthespaceraceortheconstructionoftherailroadsIfAmericanindulgeinabitofflag--whenthejobisdone，theyearnedit． Nowthereisasimilarchallenge--globalwarmin9．Thesteadydeteriorationoftheveryclimateofthisveryplanetisbecomingawarofthefirstorder，andbyanymeasure，theU．S．islosing． Indeed，ifAmericaisfightingatall，it’sfightingonthewrongside．TheU．S．producesnearlyaquarteroftheworld’sgreenhousegaseseachyearandhasstubbornlymadeitclearthatitdoesn’tintendtodoawholelotaboutit．Althoughl74nationsapprovedtheadmittedlyflawedKyotoaccordstoreducecarbonlevels，theU．S．walkedawayfromthem．Therearevaguepromisesofmanufacturingfuelfromherbsorpoweringcarswithhydrogen．Butforacountrythattightlycitespatriotismasoneofitscorevalues，theU．S．istakingapassonwhatmightbethemostpatrioticstruggleofall.It′shardtoimagineabiggerfightthanoneforthesurvivalofacountry′scoastsandfarms,thehealthofitspeopleandstabilityofitseconomy. Therubis,ifthevastmajorityofpeopleincreasinglyagreethatclimatechangeisaglobalemergency,there′sfarlessagreementonhowtofixit.Industryoffersitsplans,whichtoooftenwouldfixlittle.Environmentalistsoffertheirs,whichtoooftenamounttonativewishliststhatcouldweakenAmerica′sgrowth.Butlet′sassumethatthoseinterestedpartiesandotherswillalwaysbentthetableandwillalwaysdemandthattheirvoicesbeheardandthattheirneedsbeaddressed.Whatwouldanaggressive,ambitious,effectiveplanlooklike--onethatwouldleavetheU.S.bothenvironmentallysafeandeconomicallysound Haltingclimatechangewillbefarharder.Oneofthemoreconservativeplansforaddressingtheproblemcallsforareductionof25billiontonsofcarbonemissionsoverthenext52years.Andyetbydevisingaconsistentstrategythatmixesshort-timeprofitwithlong-rangeobjectiveandblendspragmatismwithambition,theU.S.can,withoutmajordamagetotheeconomy,helphalttheworsteffectsofclimatechangeandensurethesurvivalofitswayoflifeforfuturegenerations. Moneywilldosomeofthework,butwhat′sneededmostiswill."I′mnotsayingthechallengeisn′talmostoverwhelming,"saysFredKrupp."ButthisisAmerica,andAmericahasrisentothesechallengesbefore." Whatdoesthepassagemainlydiscuss
A.Human wars. B.Economic crisis. C.America' s environmental policies. D.Global environment in general.正确答案C
