The Stefan-Boltzmann Law in physics enables us to determine not only the outward radiative flux from a body at a certain temperature, but also the maximum equilibrium temperature that any given single source of radiation could achieve in a target. There are online calculators such as here to which you may wish to refer. If you enter one (1) for both the emissivity and the
Climate science is in a difficult position. On the one side, climate scientists like James Hansen say that the data behind IPCC media talking points is too easy to misinterpret so people shouldn t have it, but to hard science people, climate science accuracy, in the science data sense, is far too inaccurate for claims that its people make.