1. HUMAN
POPULATION
GROWTH

2. Population in Billion

3. You guessed it exponential growth!
Is this exponential growth (J-curve) or logistic growth (S-curve)?
You guessed it exponential growth!

4. 3 million years to get to 1 billion 1830
100 years to 2 billion
30 years to 3 billion
15 years to 4 billion
12 years to 5 billion
12 years to 6 billion
12 years to 7 billion
Projected 8 billion

5. At the present rate, we are adding to the world:
A New York city every month
A Germany every year
An India every 10 years

6. The good news is that we are not growing as fast as we were.

8. However, we are not growing at the same rate everywhere in the world, take a moment to look at the data in the next slide.

10. Zero Population growth (ZPG)
Birth rate = death rate
This means that the population stops growing because births and deaths occur at the same rate.

11. Population momentum
Term that is used to describe the fact that if one has no immigration, and if one makes a sudden change in the fertility rate, the full effect of the change will not be realized until all persons have died who were living at the time the change was made.

12. Age Structure diagrams
The age structure of a population is usually shown graphically
The population is usually divided up into pre-reproductive, reproductive and post-reproductive ages
The age structure of a population dictates whether it will grow, shrink, or stay the same size