Gallup[1].McCarthy,Justin.“MoreAmericansSayCrimeIsRisinginU.S.”GallupNews,October22,2015.AccessedDecember1,2017.
Gallup[2].Brewer,Geoffre
yIndicators.”LastmodifiedOctober31,2017.
AccessedNovember29,2017.gapm.io/xfaofsec.
FAO[4].FAOSTATWorldTotal,Yield:Cereals,Total,1961–2014.LastmodifiedMay17,2017.AccessedNovember29,2017.gapm.io/xcer.
FAO[5].“StateoftheWorld’sLandandWaterResourcesforFoodandAgriculture.”SOLAW,FAO,Maps,2011.gapm.io/xfaowl17.
FBI(FederalBureauofInvestigation).UniformCrimeReportingStatistics.
CrimeintheUnitedStates.Allreportedviolentcrimesandpropertycrimescombined.AccessedOctober12,2017.gapm.io/xfbiu17.
Foresight.MigrationandGlobalEnvironmentalChange.FinalProjectReport.
London:GovernmentOfficeforScience,2011.gapm.io/xcli17.
FRD.Ofcansky,ThomasP.,LaverleBennetteBerry,andLibraryofCongressFederalResearchDivision.Ethiopia:ACountryStudy.Washington,DC:FederalResearchDivision,LibraryofCongress,1993.gapm.io/xfdi.
Friedman,ThomasL.TheWorldIsFlat:ABriefHistoryoftheTwenty-firstCentury.NewYork:Farrar,Straus&Giroux,2005.
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