Author Question: Which of the following is a threat to the ozone layer? A) coal burning B) freon refrigerants C) ... (Read 33 times)

oliviahorn72 · **on:** Jul 29, 2018

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.