The oceans have heaved up and down as world temperatures have waxed and waned, but as new research tracking the past 2,800 years shows, never during that time did the seas rise as sharply or as suddenly as has been the case during the last century.
http://www.climatecentral.org/news/study-reveals-acceleration-of-sea-level-rise-20055
http://www.climatecentral.org/news/study-reveals-acceleration-of-sea-level-rise-20055