简介:OnthebasisofMARKAL-MACROmodelof'Energy-Economy-Environment'systemandKeyfitzmodelofdemography,energydemandinChinainthefuturewascalculated.Threescenarioswereputforwardtakingintoaccountofenergyefficiency,energystructureandrestrictionofclimatechange.CO2EmissionsinChinawillreachpeakvalue11.85Gtin2042inreferencescenario;10.75Gtin2036inoptimizedscenario;and9.47Gtin2031inrestrictionscenarioofclimatechange.Comparewithreferencescenario,carbonemissionsinrestrictionscenarioofclimatechangewilldeclineby2.38Gt,andpeaktimewillbellyearsearlier.Withthedevelopmentofurbanizationandindustrialization,carbonemissionsfromelectricpower,cement,steelwillrisegraduallythengodown;butemissionsfromtrafficwillgoupcontinuouslybecauseoftheincreaseofvehiclefleet.
简介:2006年8月,国家人口和计划生育委员会组织实施了第六次全国(不含香港、澳门特别行政区和台湾省,下同)人口和计划生育抽样调查。本次调查采取三阶段、与规模成正比的概率抽样方法,在全国120个统计监测县(市、区)进行,对全国有较好的代表性。共调查1200个村(居)委会,