Missing Parameters in the CMB Physics

The lecture is devoted to the comparison of a few models of cosmic recombination kinetics with recent CMB anisotropy data and to corresponding predictions for the upcoming PLANCK mission. The influence of additional sources of ionized photons at the epoch of hydrogen recombination may restrict our possibility to estimate the density of baryonic fraction of matter when using PLANCK data. This new source of degeneracy of the cosmological parameters which can be estimated from the CMB anisotropy data can mimic the distortion of the CMB power spectrum for different models of baryonic matter. I would like to point out that realistic values of the cosmological parameters can not be obtained without PLANCK polarization data.