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The Greenland ices sheets have survived 110,000 years (as evidenced by the ice core data) - and seem to have been around for a lot longer. The current nett mass loss - as recorded by the Grace satellites - is inconsistent with that kind of survival time.
A "buried volcano" might indeed explain a local increase in mass loss, but the evidence suggests that the ice sheet is losing mass all over.
-- Bill Sloman, Nijmegen