Linked from
The 14 pages that link to Marine ice-sheet instability, each with the reason it gives.
Ice sheetRelated: Retreat into deeper water can expose thicker ice and increase ice discharge.
Ice shelfRelated: Shelf thinning can reduce the restraint on grounded marine ice.
West AntarcticaRelated: Much of the West Antarctic Ice Sheet rests on a bed that deepens inland.
Amundsen SeaRelated: Thinning and retreat of glaciers here raise concern about this feedback.