1. How many people can the Earth support?* What do you think? Why is your estimate reasonable? What have others estimated? Where are we at now? *See the book of this title by Joel E. Cohen, published in 1995 by W. W. Norton & Co.

2. How many people can the Earth support? What do you think? –Class data –mean=140 billion

3. How many people can the Earth support? What are the factors that limit population size? Arable land agriculture/industry/medicine Energy Food Water Photosynthesis Space Waste Atmosphere Disease

4. How many people can the Earth support? Before we start… –How many people are there now on Earth?

5. How many people can the Earth support? Before we start… –How many people are there now on Earth? –What you thought at the beginning of the term:

6. How many people can the Earth support? Before we start… –How many people are there now on Earth? –What you thought at the beginning of the term: –What you know now…What you know now…

7. How many people can the Earth support? What do you think?

8. How many people can the Earth support? What do the “experts” think?

9. How many people can the Earth support? What do the “experts” think?

10. How many people can the Earth support? What do the “experts” think? –54  168 billion

11. How many people can the Earth support? Where are we at now? –6 billion, more or less.

12. How many people can the Earth support? Where are we at now? –6 billion, more or less How did we get here?

13. How many people can the Earth support? Where are we at now? –6 billion, more or less How did we get here? More recently…(since the last ice age)

14. How many people can the Earth support? Where are we at now? –6 billion, more or less How did we get here? More recently…(since the birth of Jesus)

15. How many people can the Earth support? Where are we at now? –6 billion, more or less How did we get here? More recently…(since the Plague)

16. How many people can the Earth support? Where are we at now? –6 billion, more or less How did we get here? More recently…(since the Industrial Revolution)

17. How many people can the Earth support? What are the factors that limit population size?