A Growing World Population

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Presentation transcript:

A Growing World Population

Population Curve For Centuries, Birth and Death Rates were about Equal

Three reasons why population has increased since the Industrial Revolution? Decrease in the Death Rate Increase in Life Expectancy Decrease in Infant Mortality

Two Changes Made this Possible we can thank science for both Changes in Agriculture have Increased the World’s food supply Advances in Medicines, health care and understanding and control of diseases

First Big Change: Improvements in Farming & Food More Food is produced Improvements in crops Crops that are better for people – legumes Use of machines: more crops with fewer people Use of fertilizers & pesticides Storage of food

Farming in the 1800’s

Improvements in Farming

The Green Revolution of the 1950’s

Fertilizers & Pesticides in the 1950’s

Increase in Food output in India

Downside of Green Revolution

2nd Big Change: Changes in Health Care Increase in Life Expectancy Decrease in Infant Mortality Rate Decrease In Death Rate

Vaccines What is a Vaccine? A vaccine contains purified fragments taken from killed bacteria or viruses. Some of the vaccines contain live viruses but in a very weak form that cannot cause the disease. How does a Vaccine work? A vaccine "teaches" the immune system how to recognize and fight the bacteria/virus before an infection develops.

Changes in Public Services Better Water and Sewer Systems Better Support Services – like aid to the poor Laws that protect workers Laws that protect the environment

Water Treatment Plant

Waste Water Treatment Process

Both Birth & Death Rates have declined

The Developed World Life Expectancy The Developed Nations have increased Life Expectancy Changes in living Conditions Medicines that help people live longer

Infant Mortality in the USA

Infant mortality has decreased in Developing Nations too

Life Expectancy Developing Nations

Developing Regions Versus Developed Nation

Population Growth Rates

Developed & Developing Regions Birth & Death Rates In the developed world, death rates have declined but birth rates have declined dramatically. In the developing world, death rates have declined, birth rates are still high.

United Nations

Most Populous Countries