Global population growth

World population

• First stage: mortality and natality are high so natural increase was low.

• Second stage: in this stage mortality decreased a lot while natality remained high. As a result of this situation there was a big population growth and life expectancy increased.

• Third stage: mortality and natality decrease, population growth started to decrease. Nowdays in some countries there is a negative population growth.

There were many improvements which made possible the population

growth in 19 th century:

• Hygiene and sanitation

• Diet.

• Vaccine.

• Health care.

• New medicines.

Alexander Fleming discovered the penicillin in 1928.

Unequal distribution of population

Physical factors

Population density:

Total population

Surface area

Example:

Population 46.000.000 inhabitants

Density in Spain :

504.645 Km

Population Density in Spain: 91inhab/km

To work out the natality we use rate birth:

total number of births

over a year

BR = X 1000

total population

MORTALITY

number of deaths over

a year

DR = X 1000

total population

NATURAL INCREASE:

Number of

births

Number of births

Number of deaths

There are two ways to work out the rate of natural increase.

• 1) Birth rate Death rate

2) NI X 100

total population

POPULATION STRUCTURE• By sex: more boys are born but women

have more life expectancy.

• By age: Europe is the region with more old people around the world. Old people represent the 21% of the total population while children represent 15 %.

Inside Europe Spain has the most difficult situation because according with the ONU studies in 35 years, Spain will be the oldest population around the world.

By labour force rate: this rate includes people who is working and people who is looking for a job.

Nowdays, unemployement is increasing in

Spain, the figure is more than 22 %. This is the double than many european countries The average in Europe is around 9%.

Expanding population pyramid

Expanding population pyramid

• This kind of pyramid shows natality and mortality high. This is typical of developing countries.

Stable population pyramid

Stable population pyramid

• Natality and mortality are constant. Population tends to age.

Contracting population pyramid

Contracting population pyramid

• This type of pyramid indicates a reduced natality and mortality. Population tends to age and decrease. This is typical of developed countries.

"Yo, ¿estudiar? ¡Si gano 3.000 pavos en el tajo!. La cita es literal. Al ocupar el apartamento que había alquilado para ese mes de agosto en Cádiz me encontré con un problema de albañilería. La propiedad me envió a un chaval que apenas rozaría los 18 años, pelo rapado de pincho, cadenota de oro y mucho, mucho desparpajo. Se me ocurrió preguntarle por su formación y fue como abrir la espita a un geiser. “Aquí no estudia ni dios, quillo. Pa qué. Mira, con esto me levanto 3.000 pavos al mes y tengo pa tó. Que si el quad, que si las tías, que buen rollito por aquí y por allá. Soy el rey. Currar y disfrutar, que pa eso no hay que usar la cabeza”