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Radiative power balance of a planet in the solar system is delineated. Theterrestrial powers are transformed to average global flux in an effectiveatmospheric column (EAC) approximation, its components are delineated. Theestimated and measured secular changes of the average global flux are comparedto the fluxes derived from the Stefan-Boltzmann law using the observed globalannual temperatures in the decades between 1880 and 2010. The conclusion ofthis procedure is that the radiative contribution of the greenhouse gas ${\rmCO}_2$ is some $21\pm 7$~\% to the observed global warming from the end of theXIXth century excluding the feedback mechanisms playing determining role in theclimate system. Stationary radiative flux transfer is treated in an air columnas a function of the column density of the absorbent. Upper and lower limit ofradiative forcing is given by assuming true absorption and coherent scatter ofthe monochromatic radiation. An integral formula is given for the outgoing longwave radiation (OLR) as a function of column density of the components ofgreenhouse gases.

Greenhouse effect from the point of view of radiative transfer