
60 Engineering Response to Climate Change
climate that the addition of one CO
2
molecule has; one CFC-12 molecule has
about 15,800 times the effect as an additional molecule of CO
2
.
Ozone (O
3
) is a gas naturally formed in the atmosphere, but its concentra-
tion is also inuenced by other atmospheric gases. Ozone has several impor-
tant effects on climate. Although the direct radiative effects of CO
2
and the
other trace gases considered above depend largely on their concentrations
in the troposphere, the climatic effect of ozone depends on its distribu-
tion throughout the troposphere and stratosphere. Ozone is an important
absorber of ultraviolet ...