Slide 12 in this series.
These curves show the different radiative forcing for changes in CO2. The formula is logarithmic in nature, so an increase of 100ppm does not have a linear increase in temp. AGW curves are shown. Saturation effects can greatly alter that.
These curves also show a wide variety of radiative forcing versus CO2 levels.
The curve on saturation is worth noting, as that is a distinct probability for CO2.
NEXT: Increasing CO2 increases absorption but what does the absorption curves look like?
The links below are to the pages or slides in this section, which covers the science of CO2.