text: This study shows that there is a fundamental issue with a critical aspect of radiative forcing (the albedo). The uncertainties are on a order of a few watts per meter squared. This uncertainty, regardless of the fraction that is due to the global models and the observations, respectively, is on the same order as the magnitudes of the the other radiative forcings! The assessment of albedo changes over time, as they influence the net radiative forcing at the level of tenths of watts per meter squared, is not yet achievable based on the results of this study.