Homework 2, due Fri oct 8, 2010
		ENVR 30: Fall 2010 

1. There are a about a trillion barrels of oil in the world's current reserves,
the value total of the U.S. stock market is around 20 trillion dollars, and
the cost of the wars in Iraq and Afghanistan has been around 1 trillion dollars.
How big is a trillion?  
If there are around 250 bills in a 1 inch stack, how high would a stack
of $1000 dollar bills be to total $1,000,000,000,000?  
The highest U.S. bill is currently the $100 bill; how high would that stack be?
Think of another way of explaining to someone how big is a trillion.

2. A bacterial culture is started in a jar at 9am.  The population of
bacteria doubles every minute.  The jar is completely full at 10am.
At what time was the jar 1/2 full?

3. Bernie Maddof, ex-chairman of NASDAC stock exchange, went to prison 
for cheating investors out of more than 50 billion dollars.  
He told his rich clients that he could guarantee 20% yearly return forever. 
a. Is this possible? Why or why not?
b. If your Mom invested $500,000 in 1965, how much would she have thought she 
had in 2008, when Madoff was arrested? 
c. Suppose you eventually inherited the account and waited until 2065.  
How much money would you think had?  
 
4. Do Calculation problem 2. on page 53
5. Do Illustration and Table review question 2 on page 53 
6. Do Illustration and Table review question 5 on page 53

7. List some of the factors involved in exponential growth of human population
	over the past 4 centuries.  Be sure to explain how the industrial
	revolution and the green revolution contributed.  

8. List and explain three policies that seem to reduce exponential 
	population growth.

9. Why do you think education of young women reduces their total fertility rate?

10. What is the "law of the minimum"?

11. Roughly how many people are living today in: 
	a. the world
	b. U.S.
	c. California
	d. San Diego
	e. La Jolla
	f. UCSD

12. Estimate how many will be living in the above areas in 200 years supposing
population increases at 1%/year.  Is this likely to happen?

13. Where did the water come from that allowed the San Fernando Valley
suburb of LA to come into existance?