1. Population Growth Calculations: Exponential Growth, Rule of 70 & Doubling Time Ch. 6

2. How Has Human Population Changed Over Time?*

3. Human Population is Growing Exponentially*

4. Exponential Growth When a quantity increases at a fixed percentage per unit of time. Example: 2% per year

5. Exponential Growth Example $100 invested at 7% a year annual compound interest will double in 10 years

6. Exponential Growth Example Applies to populations too! If a population grows at 7%/year it will double in 10 years!

7. Doubling Time The time it would take for population to double if it were growing exponentially at a constant rate.

8. Rule of 70 A trick to estimate population doubling Doubling Time (years) = 70 % Growth Rate

9. Population Density

10. Birth or Death Rate

11. Population Growth Rate (r)