1. Human Populations

2. A Brief History
Human’s ability to learn, communicate, make tools and control fire enabled invasions of environments not previously inhabitable to their earlier ancestors.

3. Hunter-Gatherers
Nomadic wandering lifestyles of hunter- gatherers with no permanent residence placed biological and social restrictions on average family sizes.
Birth-rate low
Death-rate high
Small numbers...

4. Agricultural Revolution
Intentional planting of seeds had profound effect on human history as humans discovered that certain plants and animals were ideally suited for cultivation and domestication.
Larger families were now possible due to agricultural practices. These activities could support larger population densities

5. Intellectual Revolution
Not all humans needed to cultivate, leaving them to become specialized artisans, scholars and merchants
This lead to...
The establishment of political organizations
Major advances in technology
Rapid growth in population...spreading across the globe and displacing indigenous people...brought plants, animals, guns, steel & diseases with them.

6. Impact of Disease
Many epidemic diseases evolved where population densities were high...spread around the world as populations increased.
Example...14th Century
Black Death (bubonic plague...bacteria Yersinia pestis)

7. Impact of Science and Medicine
17th century... Science-based knowledge and technology became major influences in factors in European societies.

8. Industrial Revolution
Populations became increasingly urbanized
Increase in food production = less farming needed
Vaccines, medicine, sanitation!!

9. Consequences?
These changes allowed humans to avoid the natural limits to growth that had existed for years. The result was a dramatic decline in death rates and a rapidly growing human population.

10. History of Human Pop Growth!
YEARS ELAPSED
YEARS
HUMAN POPULATION
3,000,000
10,000 B.C.E. (Agricultural Revolution)
5-10 Million
10,000
1 A.D.
250 Million
1,800
1800 (Industrial Revolution)
1 Billion
130
1930
2 Billion 30
1960
3 Billion 15
1975
4 Billion 12
1987
5 Billion
1999
6 Billion 13
2012*
7 Billion
2025*
8 Billion

11. Visuals!! Population Connection...World population video
Earth Apple of our Eye Demo...usable land and water!...Eco-Footprint
World Population Clock
Homework P.704 1, 2, 4, 5