3. Population
• 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
6. Population 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
8. Carrying 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
10. Population 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
12. Slow 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.
14. Causes 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.
15. High 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.
16. • 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).
18. Migration 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.
20. 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.
21. Geographical Distribution of
world 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
22. Human 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
