World population

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Topic Topic

World populationWorld population

PopulationPopulation

• A group of individuals of the same species occupying a particular geographic area.

• Populations may be relatively small and closed, as on an island or in a valley

World populationWorld population

• The world population is the total number of living humans on Earth.

World populationWorld population

Population growthPopulation growth

• 'Population growth' refers to the growth in human populations. Global population growth is around 80 million annually, or 1.2% p.a. The global population has grown from 1 billion in 1925 to 7 billion in 2012. It is expected to keep growing to reach 11 billion by the end of the century

Population growthPopulation growth

Carrying capacityCarrying capacity

• The carrying capacity of a biological species in an environment is the population size of the species that the environment can sustain indefinitely, given the food, habitat, water and other necessities available in the environment

Carrying capacityCarrying capacity

Population growth ratePopulation growth rate

The average annual percent change in the population

The growth rate is a factor in determining how great a burden would be imposed on a country by the changing needs of its people for infrastructure

Population growth Population growth

Slow growth of populationSlow growth of population

• Many different populations exist worldwide. A slow growth population is one that does not expand at a fast rate. If the number of a population's young exceeds that of its elderly, it is a growing population.

Slow growth of populationSlow growth of population

Causes of slow growthCauses of slow growth

High mortality rate due to plagues.

More than half of all children born die before the age of five.

High death of women due to delivery.

High growth of populationHigh growth of population

• world's population had reached 7 billion. While the media coverage focused on the implications of the growing population and the resulting strains that this growth can cause, less attention was paid to the fact that the population growth varies greatly from country to country.

• That is, some countries have experienced major population increases while others are experiencing daily population declines.

• When we examine population changes at a national level, we need to recall that a nation's population can increase through internal growth (having more births than deaths) and through external growth (having more immigration than emigration).

world top 10 countries by world top 10 countries by populationpopulation

Migration of PopulationMigration of Population

• Human migration is the movement by people from one place to another with the intention of settling in the new location

• The movement is typically over long distances and from one country to another, but internal migration is also possible. Migration may be individuals, family units or in large groups.

migrationmigration rates rates

Nomadic movements are normally not regarded as migrations as there is no intention to settle in the new place and because the movement is generally seasonal.

Geographical Distribution of Geographical Distribution of world Populationworld Population

• Population distribution means the pattern of where people live. World population distribution is uneven. Places which are sparsely populated contain few people. Places which are densely populated contain many people

Human populationHuman population

•  Human population has increased dramatically over the last few centuries. In 1830, more than 900 million people inhabited Earth. As the twenty-first century approaches, Earth’s population is nearly six billion. At the same time, extraordinarily large and dense clusters of people are growing: Tokyo has already reached a population in excess of 25 million

Geographical Distribution of Geographical Distribution of world Populationworld Population

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