Human Population Explosion: Impact on the Environment, Assignments of Social Sciences

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HUMAN

POPULATION

EXPLOSSION

Presented by:

Mamoona Ghaffar

na

HUMAN POPULATION

EXPLOSSION :

IMPACT ON ENVIRONMENT

SUBMITTED TO: MA’AM MEMOONA ASIM SUBMITTED BY: MAMOONA GHAFFAR ROLL NO: 35846 DEGREE: BS HONS BOTANY (REGULAR) COURSE TITLE: ENVIRONMENTAL BIOLOGY COURSE CODE: BOT- TOPIC: HUMAN POPULATION EXPLOSION : IMPACT ON ENVIRONMENT

POPULATION

EXPLOSION

 Population explosion

literally means a sudden or

large increase in the size of a

population.

 Population explosion

refers to the sudden & rapid

rise in the size of population.

A drastic growth in

population beyond normal

limits is called population

explosion.

Mamoona

Definitions:

Introductio

^ n The literal meaning of population explosion is a “

pyramiding of numbers of a biological population ”.

 In simple words, it can be defined as increase in birth

rates and decrease in death rates.

 Demography: is the study of human

population and things affect them such as births, deaths,

income.

 The human population is not increasing at a uniform

rate in all parts of the world.

 (^) The population of Pakistan is 32.

million at the time of independence in 1947.

 (^) It has now increased to around 150-

million people in a year 2000.

 (^) About 20 year ago human population

was increasing at the rate of 2% a year and was doubling every 35 years, thus increasing demand for food space & other resources.

EXAMPLE OF POPULATION EXPLOSION IN PAKISTAN

Mamoona

Image by: Mamoona Ghaffar

1.Accelerating birth rate Due to lack of awareness about the positive impact of using birth control method, there has been a steady growth in birth rate.

2. Decrease in infant mortality rate: Improvement science and technology and wide usage of drugs has reduce the infant mortality rate. 3. Increase immigration: It happens when a large number arrive at an already populated place with intention to reside permanently.

CAUSES OF POPULATION EXPLOSION

4. Lack of Family Planning

• (^) Most developing nations have a large number of people who are illiterate, live below the poverty line, and have little or no knowledge about family planning. 5. Technological Advancement in Fertility Treatment
• (^) With the latest technological advancement and more discoveries in medical science, it has become possible for couples who are unable to conceive to undergo fertility treatment methods and have their own babies. 6. Better Medical Facilities
• (^) Medical science made many discoveries thanks to which they were able to defeat a whole range of diseases.

HOW POPULATION EXPLOSION EFFECT THE ENVIRONMENT

Overview:

More population means more mouths to eat food which requires more agricultural production. More cultivable land has been made available by clearing forests & by reclaiming wet lands & ponds. Advanced agriculture requires utilization of more water, more fertilizers & more pesticides. It demands more space to construct houses & availability of more consumer goods. It also requires more means of transport, more consumption of fossil fuels & more pollution of land, air & water. Thus growth of population leads to pollution of land, water & air..

IMPACT OF

POPULATION

EXPLOSION

ON

ENVIRONMENT

Mamoona Mamoona

2. Urbanization:2. Urbanization:

Rapid growth of population has led to urbanization which has adversely affected environment.

Due to population pressure, natural resources in the cities are depleted at a fast rate.

Rapid growth of

population has led to

urbanization which

has adversely affected

environment.

Due to population

pressure, natural

resources in the cities

are depleted at a fast

rate. Mamoona

Mamoona

As the population grows, more and more forests are cleared.

The 2 most common reasons for deforestations are to make houses for increased number of people to live in, & to use wood as a fuel in the industries.

As a result the trees that help us in reducing the air pollution through the process of photosynthesis are not able to do so any more.

As the population grows, more and

more forests are cleared.

The 2 most common reasons for

deforestations are to make houses

for increased number of people to

live in, & to use wood as a fuel in

the industries.

As a result the trees that help us in

reducing the air pollution through

the process of photosynthesis are

not able to do so any more.

3. Air pollution:3. Air pollution:

Mamoona

5. Deforestation:5. Deforestation:

Forests have moderate influence against floods & thus they protect us from the soil erosion. Forests also play an important role in enhancing the quality of environment by influencing the ecological balance & life support system. Continuing deforestation has brought major ecological & socio-economic crisis.

Forests have moderate influence against floods & thus they protect us from the soil erosion. Forests also play an important role in enhancing the quality of environment by influencing the ecological balance & life support system. Continuing deforestation has brought major ecological & socio-economic crisis. Mamoona

6. Depletion Of Ozone Layer6. Depletion Of Ozone Layer

The ozone layer has been gradually ruined by the effect of CFCs. Other chemicals such as, Bromine, Halocarbons, Nitrous oxides from fertilizers, Nitrogen oxides & Methane may also attack the ozone layer. The concentration of CFCs has been increased as the human population has grown & the thickness of ozone layer has been lesser to the extent that a hole has been formed. Antarctica was an early victim.

The ozone layer has been gradually ruined by the effect of CFCs. Other chemicals such as, Bromine, Halocarbons, Nitrous oxides from fertilizers, Nitrogen oxides & Methane may also attack the ozone layer.

The concentration of CFCs has been increased as the human population has grown & the thickness of ozone layer has been lesser to the extent that a hole has been formed. Antarctica was an early victim.