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2019-2020年高中英语Unit3BacktothepastPeriodOneWeletotheunitReading讲义牛津译林版必修oftheRomanEmpireCollapsingClimatechangecouldhavebeenresponsibleforbringingdowntheRomanEmpire,scientistsbelieve.Researchersstudiedancienttreegrowthringstoshowlinksbetweenclimatechangeandmajoreventsinhumanhistorysuchasmigrations,plagueandtheriseandfallofempires.Theydiscoveredthatperiodsofwarm,wetweathercoincidedwithperiodsofprosperity,whiledroughtsorvaryingconditionsoccurredattimesofpoliticalupheavalsuchasthedemiseoftheRomanEmpire.Tomatchtheenvironmentalrecordwiththehistoricalone,researcherslookedatmorethan7200treefossilsfromthepast2500years.Thestudy,publishedinthejournalScience,said Theriseandfallofpastcivilizationshavebeenassociatedwithenvironmentalchange,mainlyduetoeffectsonwatersupplyandagriculturalproductivity,humanhealthandcivilconflict.Wetandwarmsummersoccurredduringper...。