Extended Data Fig. 2: Curve relating eustatic sea level to ice volume.

(modified from ref. ^79,80,81,82). Total pre-industrial ice volume (Antarctica-AnIS + Greenland-GrIS) is ~ 34 M km³ with a sea level equivalent of 64 m (LGM – Last Glacial Maximum). Early Jurassic Atmospheric CO₂ is only that from the late Pliensbachian.