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Last week, NASA scientists published a study in the "Journal of Glaciology" claiming that the continent of Antarctica is gaining ice, rather than losing it, to the tune of 82 gigatons per year from 2003 to 2008. Geoscientist Christopher Harig of Princeton University defends GRACE measurements and the finding that Antarctica is losing mass, and that a key part of the difference between his research and the new study involves how researchers handle “glacial isostatic adjustment” or GIA.