JCH– Bart V explained his comment, and I now understand his comment. At a larger level, have you read this study?
http://www.jcronline.org/doi/abs/10.2112/JCOASTRES-D-10-00157.1
It shows that sea levels have not risen as a result of AGW. (at least for the USA which is a pretty good sample size) Shouldn’t that seem to provide pretty good data to minimize people’s concerns about sea level rising being a huge problem?