参考答案

正确答案：D
问题句说“当联合国还在犹豫不决的时候，第三世界的人们因为意识到了下列三个选项中的内容而采取了行动，还有哪个选项不是第三世界的人们所意识到的内容?”被选项中出现的都是细节信息，利用被选项中的这些细节信息词作为答案线索在文章中查找答案相关句：(最后一段)Whilegovernmentshaveditheredatapacethatcouldmakedriftingcontinentsimpatient，peoplehaveacted．Birth—ratesaredroppingfasterthanexpected，notbecause0fRiobutpoorpeoplearedecidingontheirowntolimitfamilysize．Anotherpositivedevelopmenthasbeenagrowingenvironmentalconsciousnessamongthepoor．FromslumdwellersinKarachi,Pakistan,tocolonistsinRondonia,Brazil,urbanpoorandruralpeasantsalikeseemtorealizethattheypaythebiggestpriceforpollutionanddeforestation.Thereiscauseforhopewewellinthegrowingrecognitionamongbusinesspeoplethatitisnotintheirlong-termintereststofightenvironmentalreforms.JohnBrowne,chiefexecutiveofBritishPetroleum,boldlyassertedinamajorspeechinMaythatthethreatofclimatechangecouldnolonger最后一段中出现前三个选项中的词语，而选项D（种族歧视）在最后一段，甚至整篇文章中都没有出现，因此答案应该选择D。