Melt [water] is the core factor in a scale-independent sensitivity of ice to climate warming.
Glaciers respond very quickly, in some cases, as fast as it takes water to fall.
In response to warming, many of the planet’s largest glaciers have accelerated their flow speeds. Several of the largest Greenland glaciers have accelerated by a factor of 2 or more, in response to changes at their fronts ultimately linkable to enhanced atmospheric and oceanic melting during a warming period. Antarctic glaciers, once dammed by shelf ice, have decanted, accelerating several times their formerly buttressed speed because melt water cut through the ice like acid, opened the flood gates.
In the mid 1990s, conventional science held the reaction time of ice sheets to be tens of thousands of years, even longer. Further science led us to recognition, that melt is a key factor that allows ice masses (large and small) to react quickly (in hours) to abrupt climate warming.