Of the gases listed below, which is not believed to be responsible for enhancing the earth's greenhouse effect?
A
Chlorofluorocarbons (CFC<sub>s</sub>)
B
Molecular oxygen (O<sub>2</sub>)
C
Nitrous oxide (N<sub>2</sub>O)
D
Carbon dioxide (CO<sub>2</sub>)
E
Methane (CH<sub>4</sub>)
Correct Answer: Molecular oxygen (O<sub>2</sub>)
Molecular oxygen (O2) is not believed to be responsible for enhancing the earth's greenhouse effect.