File Name: population growth and explosion .zip
Read this article to learn about the causes, characteristics and explosion of population growth! The growth in human population around the world affects all people through its impact on the economy and environment.
Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. The value placed upon large families especially among under-privileged rural populations in less developed countries who benefit least from the process of development , the assurance of security for the elderly, the ability of women to control reproduction, and the status and rights of women within families and within societies are significant cultural factors affecting family size and the demand for family planning services. Even with a demand for family planning services, the adequate availability of and access to family planning and other reproductive health services are essential in facilitating slowing of the population growth rate.
If you create an account, you can set up a personal learning profile on the site. Figure 2. Growth is slow until the middle of the 20th century, when the gradient slope of the graph increases, indicating a change to more rapid population growth. The graph continues into the future to a predicted global population in in excess of 9 billion. There are many factors that influence this trend.
High rates of infant and childhood deaths and short lifespans put a limit on population growth in the past. However, improvements in nutrition, water, medical care and other technological advances have contributed to a sharp decline in deaths while births continue to increase, resulting in population growth.
Look at Figure 2. How would you describe the predicted trend in world population for the middle of the 21st century? For most of the 21st century, from to about , the trend shows a steady increase. By the middle of the century, at the far-right side of the graph, the gradient of the line on the graph is less steep — it flattens out slightly — indicating the rate of increase is expected to slow down by that date.
The main causes of death are disease, famines, accidents and war. Underlying these direct causes are interrelated contributory factors such as poverty, availability of health care, education and other social and economic factors. Since the start of the 20th century, there has been a sharp decline in death rates and an increase in length of life due to changes in these factors, which has resulted in an ageing global population.
The rates of change in population vary in different regions of the world and can be categorised into groups based on the socio-economic development status of different countries, as shown in Figure 2. Does the trend in population change shown in Figure 2. This corresponds to the slowing down of population increase shown in Figure 2. The least developed countries continue to have a higher rate of population increase for several reasons. Significant among these is the fact that the benefits from advances in health and agriculture are not spread evenly across the world.
Medical technologies, for example vaccines and antibiotics, reduce the death rate by protecting people against diseases like influenza, measles, polio and rubella. However, vaccines are still not available for many diseases like malaria that are common in less developed countries, particularly in sub-Saharan Africa.
Other public health measures, like water and sanitation, waste management and nutritional education are very important in preventing disease and in reducing the death rate.
These measures are well developed in industrialised countries but less so in developing countries. Similarly, in agricultural science and technology, advances such as new kinds of seed, fertilisers, pesticides and mechanisation in farming have transformed food production. These have increased the quantity of food produced, which has helped to improve nutrition and decrease death rates.
However, advanced food production and distribution are still developing in many countries. For further information, take a look at our frequently asked questions which may give you the support you need.
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Create account See more courses. View larger image. From Figure 2. Which development group has the highest annual rate of population change?
More developed regions are expected to have zero growth or, in other words, a static population level. Least developed countries contribute the highest annual population change for the world in the years between and Go to next page Next 2.
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At the beginning of the nineteenth century, the total world population crossed the threshold of 1 billion people for the first time in the history of the homo sapiens sapiens. Since then, growth rates have been increasing exponentially, reaching staggeringly high peaks in the 20th century and slowing down a bit thereafter. Total world population reached 7 billion just after and is expected to count 9 billion by This paper first charts the differences in population growth between the world regions. Next, the mechanisms behind unprecedented population growth are explained and plausible scenarios for future developments are discussed. Crucial for the long term trend will be the rate of decline of the number of births per woman, called total fertility.
Dear EarthTalk : To what extent does human population growth impact global warming, and what can be done about it? No doubt human population growth is a major contributor to global warming, given that humans use fossil fuels to power their increasingly mechanized lifestyles. According to the United Nations Population Fund, human population grew from 1. Think about it: It took all of time for population to reach 1. During that time emissions of CO2, the leading greenhouse gas, grew fold. And with worldwide population expected to surpass nine billion over the next 50 years, environmentalists and others are worried about the ability of the planet to withstand the added load of greenhouse gases entering the atmosphere and wreaking havoc on ecosystems down below.
Human overpopulation or human population overshoot refers to a human population that is too large to be sustained by its environment in the long term. The idea is usually discussed in the context of world population , though it may also concern regions. Human population growth has in recent centuries become exponential due to changes in technology that reduce mortality. Experts concerned by this trend argue that it results in a level of resource consumption which exceeds the environment's carrying capacity , leading to population overshoot. The subject is often discussed in relation to other population concerns such as demographic push , depopulation , ecological or societal collapse , and human extinction.
PDF | The rapid increase of human population is putting an incredible strain on our environment. While developed countries continue to pollute the | Find, read.
If you create an account, you can set up a personal learning profile on the site. Figure 2. Growth is slow until the middle of the 20th century, when the gradient slope of the graph increases, indicating a change to more rapid population growth.
Human overpopulation or particularly human population overshoot refers to a human population being too large in a way that their society or environment cannot readily sustain them. It can be identified with regional human populations, but is generally discussed as an issue of world population. Overpopulation is argued to be the cause, due to demographic pressure, of overconsumption and subsequently overshoot. This leads to exceeding the carrying capacity of a geographical area and damaging the environment faster than it can be replenished.
Overpopulation or overabundance occurs when a species' population becomes so excessive that people deem it must be managed. It can result from an increase in births fertility rate , a decline in the mortality rate , an increase in immigration , or a depletion of resources. When overpopulation occurs the available resources become too limited for the entire population to survive comfortably or at all in long term. In ecology , overpopulation is a concept used primarily in wildlife management. As such, overpopulation is thus characterised by an increase in the diseases and parasite-load which live upon the species in question, as the entire population is weaker.
The most spectacular demographic changes in the whole of human history are currently taking place on the African continent and this development is set to continue over the course of the coming decades. As Europeans used to stagnant population figures, we find it very difficult to grasp the consequences of a three per cent growth in population leading to an approximate doubling of the population every twenty years.
Next, the mechanisms behind unprecedented population growth are explained and plausible scenarios for future developments are discussed.Sandcocurna 01.05.2021 at 13:43
Population growth is the increase in the number of individuals in a population.Ishauhunfilm1967 05.05.2021 at 18:43
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