Yes, 3.2 mm isn't much....only about 1/8th of an inch. However, over an extended period of time, that builds up. Here's a chart showing the rise over the past century, and if that trend continues, another century will see some marked effects on many coastal regions. If more Melts than Freezes...which appears to be the case...a lot of coastal cities will face some serious problems.Yes it can but it averages out between melting and freezing. All you can go by is the average rising sea level. 3.2 mm per year so far.
Here's another chart showing the increase in Coastal Flooding over the past 50 years, vs. the 1950's....