@wildgrass said
Also there's the geological data. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3557064/
It shows lots of data a graphs and it says among other things;
"Here we use observations from five well-studied time slices covering the last 40 My to identify a well-defined and clearly sigmoidal relationship between atmospheric CO2 and sea level on geological (near-equilibrium) timescales. This strongly supports the dominant role of CO2 in determining Earth’s climate on these timescales
...
Data from gas bubbles in ice-core samples provide a high-fidelity CO2 record for the last 800,000 y (6–8) that, when coupled with sea-level records of similar resolution (9), illustrates that CO2 and sea level are intimately related on these timescales (Fig. 1). This relationship arises because CO2 is the principal greenhouse gas that amplifies orbital forcing and to a large extent determines the thermal state of the Earth system across glacial–interglacial cycles and thus the amount of ice stored on land (3). In detail, there are short leads and lags between Earth system components because of different timescales of inertia, but the overall relationship is strong (R2 = 0.68; n = 2051; Fig. 1).
...
A combination of data from all five time slices (Fig. 3A) reveals that on these longer timescales, there is a clearly sigmoidal relationship between sea level and climate forcing by CO2.
...
Our observed long-term relationship between sea level and CO2 forcing reaffirms the importance of CO2 as a main driver of changes in the Earth’s climate over the past 40 My.
...
During the Eocene, when CO2 levels were higher than 1,000 ppm, sea level was 60–70 m higher than today,
.."
So its clear that all the sea level data indirectly confirms what we already knew here which is simply what the science says; CO2 is a greenhouse gas.