Answer the following questions. You will receive immediate feedback when you select your answer or when you click on the green check mark (). When you are finished, click the How Did I Do? button to see your score.

1. Can the biosphere change weather patterns?
   
   

2. How did the invention of the tractor influence the weather of the early 1900s?
   
   

3. What did the US government do to help solve the problem?
   
   

4. What is the greenhouse effect?
   
   

5. What impact do some scientists predict global warming will have on the earth?
   
   

6. Do all scientists agree that carbon dioxide emissions created by humans are changing the weather cycles?
   
   

7. How much has the earth's average temperature increased during the last century?
   
   

8. What has happened to the level of the sea due to the increase in temperature?
   
   

9. What are some examples of products that, when burned, add carbon dioxide to the atmosphere?
   
   

10. Which planet's atmosphere is composed largely of carbon dioxide?
    
    

11. How much of an increase in atmospheric carbon dioxide levels has occurred in the last one hundred years?