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Applied sciences and engineering/Systems theory/Mass balance

All the major regions of the polar ice sheets except one have been losing mass since 1992, according to a study that pulls together several independent measurement methods.

All told, mass loss from the polar ice sheets has contributed 11.1 +/- 3.8 millimeters to global sea level since 1992, researchers report in the 30 November issue of the journal Science. This is roughly 20% of the total global sea level rise during that period.