OverpopulationOverpopulation is a condition where an organism's numbers exceed the carrying capacity of its In common parlance， the term usually refers to the relationship between the human population and its environment， the E[1]Overpopulation does not depend only on the size or density of the population， but on the ratio of population to available sustainable It also depends on the means of resources used and distributed throughout the If a given environment has a population of 10 individuals， but there is food or drinking water enough for only 9， then in a closed system where no trade is possible， that environment is overpopulated; if the population is 100 but there is enough food， shelter， and water for 200 for the indefinite future， then it is not Overpopulation can result from an increase in births， a decline in mortality rates due to medical advances， from an increase in immigration， or from an unsustainable biome and depletion of It is possible for very sparsely-populated areas to be overpopulated， as the area in question may have a meager or non-existent capability to sustain human life ( the middle of the Sahara Desert or Antarctica)The resources to be considered when evaluating whether an ecological niche is overpopulated include clean water， clean air， food， shelter， warmth， and other resources necessary to sustain If the quality of human life is addressed， there may be additional resources considered， such as medical care， education， proper sewage treatment and waste Overpopulation places competitive stress on the basic life sustaining resources， leading to a diminished quality of [2] Some countries have managed to increase their carrying capacity by using technologies such as modern agriculture， desalination， and nuclear
Moves towards old age and developed country population old agedevelopment while the world population， the Chinese population old agealso is The population old age production， is preciselythe society progresses， the economical development The Chinesepopulation transforms was generally considered the beginningestablishes new China， at first was the mortality rate obviously andrapidly But the nationwide fertility rate transfers 变则 thebeginning to 20th century 70's initial period country birth controlpolicy involvement， and rapidly changes the low fertility rate levelby the high fertility rate Thus， the population old age hascaused the question which the labor force population burdenunceasingly increases， has affected our country social economydevelopment， and to corresponding material and the spiritual variousaspects and so on infrastructure， legal system construction set thenew Had issued in view of this situation nation old age committee "theChinese Old age Enterprise Develops" 十15 "Plan"， proposed "十15"period， China is caring for the aged the safeguard， the medicalsafeguard， the social rescue and so on， as well as the old ageenterprise infrastructure construction， the old age industry， aspectand so on old age spirit culture life must realize goal and Wealready must correctly understand the Chinese population old ageformation reason， the basic characteristic， the development tendencyas well as possibly produce the social economy consequence， needs toclarify the population old age to the social economy movement and thesustainable development Only this， can enhancepolicy-making the scientific nature and the feasibility， solves thegood population old age problem， for implements the sustainabledevelopmental strategy creation advantageous population Through to the population old age scientific connotation limits， isclear about the our country population old age Through topopulation old age evolution process research， key elaboration ourcountry population old age characteristic and its to economy， societyand family and so on various aspects influence， thus solves owninsufficiency， proposes the solution population old age questioncorresponding countermeasure 关键词：Key word: Population old age population burden old age social securitysustainable development
