According to an article publishes in the sociology online, the major trends that show the importance of population patterns includes the birth rates, death rates, life expectancies and migrations all of which has a direct effect on changing population size. Their understanding helps to know of the effects of such trends on an area. This includes the capacity of an area to support the changing population through its resources which is dependent on a number of factors. These factors include the natural calamities such as disease epidemics and droughts which in the past history has been known to affect the population growth rates.
One of the most fascinating aspects about the current population growth trend is that, the highest population growth trend is being recorded in the less developed economies which have little potential to absorb and sustain this growing population by providing sufficient food and healthcare. The Rule of 70 refers to a simple way of estimating exact time it would take for a population with a known annual growth rate to double in size. It applies two factors of a ratio of 70 to the population growth rate expressed as a percentage.
The significance of this rule is that, it gives a reality of the effect of the current growth rates in a given time period. This rule helps in offering an opportunity to take appropriate measures in time before one can be faced the reality of the consequences. Such measures include the access to reproductive health in the developing countries which for now have the shortest predicted doubling time. ZPG stands for Zero Population Growth, and is best exemplified by a scenario where a couple in a population with a very low infant mortality rate bears only two children thereby replacing themselves.
In the long-run, the population growth rate remains at a zero level at it is neither increasing nor decreasing. The increase in population in the U. S despite the zero population growth is a resultant of the high international immigration of foreigners into this country. The rise in population in the third world countries is a resultant of reduced death rates especially due to improvement in health care which has reduced the infant mortality rate. Most of people are also accustomed to large families as a source of social security in their old age.
There has also been a reduction in number of calamities due to improvement in food security. The government and people in these countries have also not fully embraced the aspect of family planning. Demographic transition refers to a three-phase change in a population from a scenario of a high birth rate and high death rate to a phase of low birth rates and low death rates. The first phase entails a high birth and death rates. This leads to a very slow population growth. The second phase involves the reduction in death rates while the birth remains constant as it happened in 19th century leading to a high population growth.
The third phase is conspicuous with the reduction in birth rates such as what has happened in most of the industrialized countries. Most of the avenues for population control include the government’s initiatives to control population and changes in lifestyle which favors low fertility rates. China has employed a restrictive government control through initiating a “single-child family policy” which matches with the country’s tradition of bringing up a small family. This has helped the country’s resources to match with the population demands.
They encourage reproduction healthcare services such as abortions, use of contraception and sterilization. A country can bring down its population by initiating population controls such as reduced birth rates and fertility rates, checking on immigration policies and encouraging voluntary fertility reduction policies. International migration is one of surest ways of distributing populations within the world. For a country like U. S this helps by bringing in skilled manpower which sustains our economy. However, this instills a social strain on a receiving country.
Political instability in some countries promotes international migration of people in form of refugees. Different continents have different trends of population depending on their level of industrialization. Continents which hosts industrialized countries have a very low population growth rates while developing continents have the highest population growth rates. The significance of the Third World population is significant to the West as the pressures from these increasing populations are felt in the west by people moving in as immigrants.
These people move in search of employment leading to a competition of few employment opportunities in the West (Teiteibaum, 22). Lack of population control in Third World will eventually lead to a higher population growth in the West. ? Works Cited Sociology online, Population patterns and Trends, viewed on 31 May 2010, from, <http://www. sociologyonline. net/text/intro/main/c4b543n. htm> Teitelbaum Michael, Jay, Winter, A Question of Number: High Migration, Low Fertility, and the Politics of National Identity. New York, Hill and Wang, 1998