简介：Theconceptofsecurityhasbeenredefinedsincethe1990s.Asoneoftheimportantfactorsthreateninghumansecurity,globalenvironmentalchangehasbecomeanewchallengetothenationalsecurityandsocialdevelopment.Thenationalsecurityproblemscausedbyglobalenvironmentalchange,ononehand,arecloselyrelatedtotheglobalenvironmentalproblems,and,ontheotherhand,aremanifestedintheconflictsofinternationalaffairs.TheglobalenvironmentalchangeseverelychallengesthefuturedevelopmentofChina.WhenitcomestothestudyonhumandimensionsofglobalenvironmentalchangeinChina,muchmoreattentionshouldbepaidtoissuesofimportantenvironmentalchangethatmayhavegreatimpactsonthenationalsecurityofChina,tothescientificassessmentofthevulnerabilitiesofthenaturalandsocialeconomicsystemofChinatotheimpactsofglobalenvironmentalchange,andtotheactiveestablishmentofthenationalriskmanagementsystem,inwhichglobalenvironmentalchangeshouldbeincluded,soastomakecontributiontosustainabledevelopmentandconstructionofharmonioussocietyofChina.

简介：Producinggoodsandservicesallneedswaterconsumption.Thewaterusedintheprocessofanagriculturalorindustrialproductiscalledthe"VirtualWater"containedinthisproduct.Throughinternationaltrade,water-scarcecountriesandregionscouldpurchasewater-intensiveproducts--especiallyfoods,fromwater-richcountriestobalancetheirwaterdeficitsandachievewatersafety.Chinaisoneofthe13mostwater-deficitcountrieswhosewatersafetyhavebeenseverelychallenged.Thispapergeneralizedtherecentglobalresearchdevelopmentandmadeabriefintroductionaboutthemethodscalculatingvirtualwatercontentinspecificproducts.Asacasestudy,wequalifiedChina'sannualvirtualwaterflowsfromyear2000to2002withtradeincrops,andendedwithsomepolicyadviceforapplicationandpracticeofvirtualwaterstrategy.

简介：Indespiteoffluctuationinrecentyears,thegrainyieldinChinahasbeenincreasing,whichrelievestheconflictbetweensupplyanddemandandturnsthesituationoffoodsecuritygood.However,becauseoftherapidincreaseinfoodconsumption,theconflictsoffoodqualityandstructureinthesupplyanddemandequilibriumhasbecomemoreandmoreobviousandthelong-effectivemechanismoffoodsecurityhasnotbeenestab-lishedyet.ItisfoundthatthefactorsaffectingfoodsecurityinChinaincludethescarcityanddissipationofresources,farmers’lowenthusiasminplantinggraincropsandtheinappropriatenessoftheemphasisandmeasuresofmacro-economicregulationandcontrol.Therefore,theauthorsadvancetooptimizeresourcesallocation,strengthenmacro-economicregulationandcontrolandpolicystimulationandestablishthemechanismofallocatinggrainproductioncost,tosetupthelong-effectivemechanismofChinafoodsecurityandkeepitstableinthelongterm.