Future prospects - Ice Ages and Interglacials: Measurements, Interpretation, and Models - page 330

Figure 11.6. Schematic representation of forcing due to CO 2 greenhouse effect as a function of
CO 2 concentration.

Figure 11.7. Absorption factor (absorptivity concentration integrated over a vertical path
through the atmosphere) for CO 2 vs. wavelength. The horizontal dashed line corresponds to
an absorption factor of 3 (essentially total absorption along a vertical path through the
atmosphere).

pre-industrial level of 280 ppm of CO 2 , the entire absorption band from 13 to

17 m is fully saturated.

Adding more CO 2 to the atmosphere does not increase absorption within the
saturated region significantly. Only at the ''wings'' of the absorption band is there

m