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This quiz consists of 5 multiple choice and 5 short answer questions through Chapters 21-25.

Multiple Choice Questions

1. During what period of time was the temperature about 2 degrees F than at the time the book was written?
(a) 1900 to 1945.
(b) 1870 to 1920.
(c) 1890 to 1925.
(d) 1860 to 1910.

2. In Chapter 25, by what percent did the use of ethanol made from sugar cane in Brazil reduce green house emissions?
(a) 78%.
(b) 85%.
(c) 93%.
(d) 90%.

3. How long do the carcinogens from coal-buring plants last in the ground?
(a) 500 years.
(b) 100 years.
(c) Forever.
(d) 50 years.

4. How long does the radioactivity of potassium-40 last?
(a) 100,000 years.
(b) 2 million years.
(c) A billion years.
(d) 9 trillion years.

5. What was the efficiency of the best solar cells at the time the book was written?
(a) 41%.
(b) 68%.
(c) 52%.
(d) 38%.

Short Answer Questions

1. In Chapter 5, what was the cost of nautral gass per million cubic feet?

2. How high in altitude must a person travel to be awarded astronaut wings by the United States?

3. How many times the energy of uranium and plutonium bombs can be released by hydrogen bombs?

4. At how many billion people did the United Nations estimate that the populations of the world would peak in Chapter 24?

5. How much of the atmosphere is made up of carbon dioxide?

(see the answer key)

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