This document discusses population growth. It defines population as a group of individuals of the same species living in an area at a given time. Population density is the number of individuals per unit area or volume. The global population has grown rapidly over the past 100 years from 1 billion to over 6 billion currently due to decreasing death rates and increasing birth rates. Rapid population growth can cause problems like increasing demands on resources, loss of agricultural land, unemployment, and environmental pollution. Methods to control population growth include policies limiting family size, sterilization, abortion, and family planning.

1. POPULATION GROWTH
K.SRIRAM
B.SELVALINGAM

2. WHAT IS POPULATION ?
• Population is defined as a group of individuals belonging to the same
species , which live in a area of given time.
POPULATION DENSITY :
• It is expressed as the number of individuals of the population per unit area or
per unit volume . This varies in response to changes in the environment and
introduction with other living organism.

3. POPULATION GROWTH
• The rapid growth of the global’s population for the past 100 years
results from the difference between the rate of birth and death.
• In 1880, the global population was about 1 billion people . It took about 130
years(in 1930) to reach 2 billion. But the population reached to 4 billion within
45 years (in 1975). Now we have already crossed 6 billion and may have to
reach about 10 billion by 2050 as per the World Bank calculations.
• Increase in population = population growth
• CAUSES OF RAPID POPULATION GROWTH :
1) Population growth is due to decrease of death rate and increase in birth rate.
2) Availability of antibiotics, immunisation , increased food production, clean
water and air decreases the famine-related deaths and infant mortality.
3) Agricultural based countries, children’s are required to help parents in the
fields that is why population increases in the developing countries.

4. PROBLEMS ( ENVIRONMENTAL ISSUSES )
OF POPULATION GROWTH
1) Increasing demands for food and natural resources.
2) Inadequate housing and health services.
3) Loss of agricultural lands.
4) Unemployment and socio-political unrest.
5) Environmental pollution.
• Causes of population growth :
1) Fertility rates.
2) International migration.
3) Increase in climate change.
4) Impact on biodiversity loss.
5) Overexploitation of resources.
•

5. POPULATION GROWTH

6. METHODS OF POPULATION CONTROL
• The different methods of population control in human beings are
1) Child Tax,
2) One-Child Policy,
3) Sterilization,
4) Medical Abortion,
5) Family Planning, etc.