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The clear sky instantaneous radiative forcings of the 14 halogenated gasespreviously shown to have the largest contribution to global warming, werefound. The calculation used the absorption cross sections for the halogenatedgases which are assumed to be independent of temperature as well as over 1/3million line strengths for the 5 naturally occurring greenhouse gases: H$_2$O,CO$_2$, O$_3$, CH$_4$ and N$_2$O, from the Hitran database. The total radiativeforcing of the halogenated gases at their 2020 concentrations is 0.52 (0.67)W/m$^2$ at the tropopause (mesopause). Over half of this forcing is due toCFC11 and CFC12 whose concentrations are declining as a result of the MontrealProtocol. The rate of total forcing change for all 14 halogenated gases is 1.5(2.2) mW/m$^2$/year at the tropopause (mesopause). The calculations assumed aconstant altitude concentration for all halogenated gases except CFC11, CFC12and SF$_6$. Using the observed altitude dependence for those 3 moleculesreduced their radiative forcings by about 10%. The global warming potentialvalues were comparable to those given by the Intergovernmental Panel on ClimateChange. The contribution of a gas to global warming was estimated using theforcing power per molecule defined as the derivative of its radiative forcingwith respect to its column density. For the present atmosphere, theper-molecule forcing powers of halogenated gases are orders of magnitude largerthan those for the 5 naturally occuring greenhouse gases because the latterhave much higher concentrations and are strongly saturated. But, the rates ofconcentration increase of the 5 main greenhouse gases are orders of magnitudegreater than that of any halogenated gas. Assuming the temperature increasecaused by each gas is proportional to its radiative forcing increase, the 14halogenated gases are responsible for only 2% of the total global warming.

Instantaneous Clear Sky Radiative Forcings of Halogenated Gases