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English population pyramid of 2,000 Features

English population

In developed countries, including Spain, have a high comfort level, expertise, high level of medicine and social laws that ensure a pension for retirement The life expectancy at increased enormously.

From the Twentieth Century (we were with a life expectancy around 40 years), began to lengthen life expectancy and is now around 80 years.

But to maintain this population is necessary for a generation to be relieved by the next with the same number of people. To achieve this replacement must be an average of 2.1 children per women. With this asegfura replacement fertility of parents and leaves room for a possible infant mortality, juvenile or sterile.

Phases of growth in world population.

Phase 1, : stability or demographic balance

For many centuries the world's population grew in a very slow, because although there were many births, deaths were also excessive. Until the twentieth century life expectancy was no more than 40 years, but thereafter was increasing and increasing ...

2 º Phase: Decline in mortality

When a population has good hygiene, good food and easy access to medical services, many diseases such as AIDS, typhoid fever can be eradicated and thus do not have nearly this is true and muertes.Si the birth rate remains high population begins to increase.