In the late 1970s, the United States banned the non-essential use ...

[s.tung]

In the late 1970s, the United States banned the non-essential use of chlorofluorocarbons (CFCs). Why?
 A) CFCs are a primary component of photochemical smog.
  B) CFCs are toxic gases.
  C) CFCs reduce the ozone concentration in the stratosphere.
  D) CFCs react with water vapor to form acid rain.

Question 2

Methane (CH4 ), nitrous oxide (N2O), and chlorofluorocarbons (CFCs) are greenhouse gases.
  Indicate whether the statement is true or false

[lorealeza77]

Answer to Question 1

C

Answer to Question 2

True