2. Section 2 Understanding Human Population Dynamics
Chapter 19
Objectives
Describe the factors that affect carrying capacity
Compare the exponential model and the logistic model of population growth.
Explain how change in population density is affected by emigration, immigration, birth rate, and death rate
Relate these factors to the exponential growth of the human populations

3. History of Human Population Growth
Section 3 Human Population Growth
Chapter 19
History of Human Population Growth
The Development of Agriculture
About 10,000 to 12,000 years ago, the development of agriculture increased the growth rate of the human population.
The Population Explosion
Improvements in hygiene, diet, and economic conditions accelerated population growth.

4. History of Human Population Growth, continued
Section 3 Human Population Growth
Chapter 19
History of Human Population Growth, continued
After World War II, the human population grew at the fastest rate in history
WHY? Better sanitation and medical care in poorer countries.
Other reasons for human population growth?
Advancements in technology: transportation, construction

5. Chapter 19 Population Dynamics Age Structure
Section 1 Understanding Populations
Chapter 19
Population Dynamics
Age Structure
A population’s age structure indicates the percentage of individuals at each age.

6. History of Human Population Growth, continued
Section 3 Human Population Growth
Chapter 19
History of Human Population Growth, continued
Population Growth Today
Developing countries have faster human population growth and lower standards of living than developed countries do.
Think about that statement. What question should you ask after hearing it?

7. Human Population Growth
Section 3 Human Population Growth
Chapter 19
Human Population Growth

8. Chapter 19 The Exponential Model
Section 2 Measuring Populations
Chapter 19
The Exponential Model
The exponential model describes perpetual growth at a steady rate in a population.
The model assumes constant birth and death rates and no immigration or emigration.

9. Follow-Up
Why is the human population following an exponential growth model?
Predict what will cause the human population to reach it’s carrying capacity
Density dependent or Density independent factor?