Which of the following is a threat to the ozone layer? A) coal ...

[oliviahorn72]

Which of the following is a threat to the ozone layer?
 
  A) coal burning
  B) freon refrigerants
  C) Both of the above.
  D) automobile exhaust
  E) None of the above.

Question 2

The contribution of efficiency to U.S. energy services is
 
  A) less than the contribution of oil but still significant.
  B) insignificant.
  C) larger than the contribution of oil.
  D) about as large as the contribution of oil.

[voltaire123]

Answer to Question 1

B

Answer to Question 2

C

[oliviahorn72]

Excellent

[gcook]

Thanks for the timely response, appreciate it