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Pakistan has just more than half as many people as the United States but if the U.S. stopped accepting new international immigrants, at Pakistan's current rate, it will surpass the United States in population within 20 years. Pakistan is one of the world's most rapidly growing countries with an annual population growth rate of 2.4 percent. This rate of growth results in a doubling of a population every 30 years. Pakistan's population was a mere 32.5 million people when it won independence in 1947. In the sixty years since independence its population increased by more than 120 million to reach 166 million people. The current rate of growth for the United States, which is influenced by movement of a large number of people into the country, yields a doubling time of 120 years. For the U.S. and Pakistan, persistence of these same rates of population growth for 115 years would result in a staggering population of more than 2 billion for Pakistan At that time Pakistan would have a population that is 3.3 times that of the United States.

International audience ; [Geopolitics of Sahelian Africa: Sahel devoted to the study explains the particular sub-population of the area and gave her internal geopolitical, ethnic diversities and the central government, religious differentiations and their use geopolitical kaleidoscope linguistics, population dynamics natural geopolitical dimension of the migration system, high population growth, the relationship between malnutrition and geopolitics.] ; Géopolitique de l'Afrique sahélienne : cette étude consacrée au Sahel explique notamment le sous-peuplement prononcé de la zone et sa géopolitique interne, les diversités ethniques et le pouvoir central, les différenciations religieuses et leur usage géopolitique, le kaléidoscope linguistique, la dynamique démographique naturelle, la dimension géopolitique du système migratoire, la forte croissance démographique, les liens entre malnutrition et géopolitique.

International audience ; [Geopolitics of Sahelian Africa: Sahel devoted to the study explains the particular sub-population of the area and gave her internal geopolitical, ethnic diversities and the central government, religious differentiations and their use geopolitical kaleidoscope linguistics, population dynamics natural geopolitical dimension of the migration system, high population growth, the relationship between malnutrition and geopolitics.] ; Géopolitique de l'Afrique sahélienne : cette étude consacrée au Sahel explique notamment le sous-peuplement prononcé de la zone et sa géopolitique interne, les diversités ethniques et le pouvoir central, les différenciations religieuses et leur usage géopolitique, le kaléidoscope linguistique, la dynamique démographique naturelle, la dimension géopolitique du système migratoire, la forte croissance démographique, les liens entre malnutrition et géopolitique.

International audience ; [Geopolitics of Sahelian Africa: Sahel devoted to the study explains the particular sub-population of the area and gave her internal geopolitical, ethnic diversities and the central government, religious differentiations and their use geopolitical kaleidoscope linguistics, population dynamics natural geopolitical dimension of the migration system, high population growth, the relationship between malnutrition and geopolitics.] ; Géopolitique de l'Afrique sahélienne : cette étude consacrée au Sahel explique notamment le sous-peuplement prononcé de la zone et sa géopolitique interne, les diversités ethniques et le pouvoir central, les différenciations religieuses et leur usage géopolitique, le kaléidoscope linguistique, la dynamique démographique naturelle, la dimension géopolitique du système migratoire, la forte croissance démographique, les liens entre malnutrition et géopolitique.

Population aging is primarily the result of past declines in fertility, which produced a decadeslong period in which the ratio of dependents to working age adults was reduced. Rising old-age dependency in many countries represents the inevitable passing of this "demographic dividend." Societies use three methods to transfer resources to people in dependent age groups: government, family, and personal saving. In developed countries, families are predominant in supporting children, while government is the main source of support for the elderly. The most important means by which aging will affect aggregate output is the distortion from taxes to fund PAYGO pensions.

This week on UCL Uncovering Politics we're looking at population displacement. What drives it, and what are its effects?

The Population Health Research Network (PHRN) is an Australian data linkage infrastructure capable of securely and safely linking and integrating data collections from a wide range of sources. It is an example of a national data linkage infrastructure in a country with a federated system of government. This population data centre profile describes Australia's unique approach to enabling access to linked data from single jurisdictions and from multiple jurisdictions. It covers the background to the establishment of the PHRN as well as information about how it operates today including operating models, governance, data, data linkage and data access. Some of the challenges of data linkage across jurisdictions are also discussed.