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Satellite altimetry has shown that global mean sea level has been rising at a rate of ~3 ± 0.4 mm/y since 1993. Using the altimeter record coupled with careful consideration of interannual and decadal variability as well as potential instrument errors, the authors of this journal article show that this rate is accelerating at 0.084 ± 0.025 mm/y<sup>2</sup>, which agrees well with climate model projections. If sea level continues to change at this rate and acceleration, sea-level rise by 2100 (~65 cm) will be more than double the amount if the rate was constant at 3 mm/y. [Source: Proceedings of the National Academy of Sciences of the United States of America]
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