Understood cause of sea level rise between 1850 and 1950 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.)
SLR is thought to be caused by temperature rise, which is caused by CO2 rise and other factors. Temperature has been rising since before 1850. It could be another Question: "Why temperature does not correspond with CO2 levels since 1850".


  
  The reconstructions used, in order from oldest to most recent publication are:
  (dark blue 1000-1991): The Holocene.
  (blue 1000-1980): Geophysical Research Letters.
  (light blue 1000-1965): Ambio. Modified as published in Science.
  (lightest blue 1402-1960): J. Geophys. Res..
  (light green 831-1992): Science.
  (yellow 200-1980): Geophysical Research Letters. doi:10.1029/2003GL017814.
  (orange 200-1995): Reviews of Geophysics. doi:10.1029/2003RG000143
  (red-orange 1500-1980): Geophys. Res Lett.. doi:10.1029/2004GL019781
  (red 1-1979): Nature. doi:10.1038/nature03265
  (dark red 1600-1990): Science. doi:10.1126/science.1107046
  (black 1856-2004): Instrumental data was jointly compiled by the Climatic Research Unit and the UK Meteorological Office Hadley Centre.
  Robert A. Rohde,  Creative Commons Attribution-Share Alike 3.0 Unported