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