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.