This question is based on the following graph from a 2018 report by J. Curry.
(I haven't found any peer-review of the report itself so I can't vouch for the validity of its claims, but that's not the heart of the question)
If I understand correctly, an idea developed by the report is that the observed rate of sea level rise during the 1850-1950 period can hardly be explained due to CO2 emissions, as those are barely significant prior to 1950.
The AR5 IPCC report on sea level change doesn't address this directly.
What is the current consensus (if any) on the causes of the observed rate of sea level rise between 1850 and 1950 ?
(To be clear, I don't intend to question the predicted sea level rise at all. This question is unrelated to the IPCC projections.)