Given the total irrelevance of volcanic aerosols
during the
period in question, the only very modest effect of fossil fuel emissions and the many inconsistencies governing the data pertaining to solar irradiance, it seems clear that climate science has no meaningful explanation for the considerable warming trend we see
in the earlier part of the 20th century — and if that's the case, then there is no reason to assume that the warming we see
in the latter part of that century could not also be due to either some as yet unknown natural
force, or perhaps simply random drift.
I'm not an expert but I think that you have to at least allow for other
forcings other than CO2 which have been
in play
during the
period in question and bear
in mind the difference between transient and equilibrium sensitivity.