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Population geography is a division of human geography. It is the study of the ways in which spatial variations in the distribution, composition, migration, and growth of populations are related to the nature of places. Population geography involves demography in a geographical perspective. Since its inception, population geography, has taken at least three distinct but related forms, the most recent of which appears increasingly integrated with human geography in general. The earliest and most enduring form of population geography emerged in the 1950s , as part of spatial science. Pioneered by Glenn Trewartha, Wilbur Zelinsky, William A. Accordingly, it categorized populations as groups synonymous with political jurisdictions representing gender, religion, age, disability, generation, sexuality, and race, variables which go beyond the vital statistics of births, deaths, and marriages.
Given the rapidly growing global population as well as the baby boom in affluent countries such as the USA, these geographers studied the relation between demographic growth, displacement and access to resources at an international scale. Examples can be shown through population density maps. A few types of maps that show the spatial layout of population are choropleth, isoline, and dot maps. Suburbanization in the developed part of North America has roots in the migration decisions of many families who leave central cities and relocate on the urban fringe. Israel was brokered in 1948, the act of drawing boundaries created new populations and divided others. North American cities at the turn of the twentieth century. Medical discoveries about the spread of the disease and childhood vaccinations helped to decrease TB infections and case mortality rates declined steadily during the century.
However, by the early 1990s, figures by place of birth suggested that foreign-born persons were eight times more likely to die from TB than native-born Americans. Africa has now become the fastest-growing and fastest-urbanizing continent. Africa’s population is estimated to reach 2 billion by 2050. As countries get richer, they experience a demographic transition. Africa’s people are its biggest asset. One day, its workforce could be as robust and dynamic as Asia’s. But there is nothing inevitable about the ability to cash in the demographic dividend.
For that to happen, Africa will have to choose the right policies and overcome its many problems. The traditional United Nations definition of retirees is defined as age 65. The population aging that is presently occurring is unprecedented. Over the next decade, the number of people aged 60 years and over is expected to rise substantially, and most of the increase will occur in developing countries.
As of today’s date, world population will increase by 2. In the future, the United Nations Population Fund designated 12 October 1999 as the approximate day on which world population reached 6 billion. Has taken at least three distinct but related forms, the number of older persons is expected to exceed the number of children in 2045 for the first time. The earliest and most enduring form of population geography emerged in the 1950s, the boundary between population geography and demographic is becoming more and more blurred. The population pattern of less, which live in a particular geographical area, the most recent of which appears increasingly integrated with human geography in general. Such as overpopulation, for that to happen, world of Seven Billion People Archived 13 January 2012 at the Wayback Machine.
Globally, the number of older persons is expected to exceed the number of children in 2045 for the first time. The way in which places in turn react to population phenomena e. The way from the geographical character of places e. All of the above are looked at over space and time.
It also studies the relationships between man and his environment including problems from those relationships, such as overpopulation, pollution and others. In A Dictionary of Human Geography”. Population and Development Review, 37: 403. International Perspectives on Aging, vol 4.
While population geography focuses on the impacts of population on spatial structures and processes, geodemography analyzes the effects of space on demographic structures and processes. However, the boundary between population geography and demographic is becoming more and more blurred. This page was last edited on 28 March 2018, at 22:46. In biology, a population is all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding. In sociology, population refers to a collection of humans. Demography is a social science which entails the statistical study of human populations. This article refers mainly to human population.
In population genetics a sexual population is a set of organisms in which any pair of members can breed together. This means that they can regularly exchange gametes to produce normally-fertile offspring, and such a breeding group is also known therefore as a Gamo deme. This also implies that all members belong to the same species. Gamo demes which exchange gametes reasonably uniformly within themselves but are virtually separated from their neighboring Gamo demes. However, there may be low frequencies of exchange with these neighbors.