What was done
The author of this study analyzed theory and data related to seafloor spreading in an effort to determine its potential contribution to changes in sea level, as well as its potential to influence climate.

What was learned
The author calculated that seafloor spreading may be directly responsible for a mean sea level rise of approximately 1 mm per year - a very significant value considering that observed rates of sea level rise over the past century are believed to be between 1-2 mm per year.  In addition, the author identified a potential feedback mechanism due to the calving of icebergs by flotation forces that result from the seafloor spreading-induced sea level rise.  And he noted that this phenomenon could induce global warming, as "the reduction in ice cap volume would tend to produce interglacial conditions."

What it means
This work provides yet another explanation for the historical sea level rise of the recent past.  It also elucidates, in the words of the author, "a mechanism whereby plate tectonics can actually drive climate."  And the author states that "at present, we are experiencing just such a phase" of "enhanced plate tectonic activity."