Actually, it's more extremes in climate that are associated with global warming. Nice try.
Not so fast. What do you mean by Climate extremes? Suddenly we get big snow storms in Maryland? But mild summers in Minnesota? That sort of wide-spead anomalous behavior? That sounds good, but sea-level changes can't fit that arguement since sea-levels tend to be ... well, level.
The Standard Global Warming argument is that warm weather melts glaciers, causing sea levels to rise, causing coastal erosion. You have just argued that Global Warming causes increased glaciation, and dropping sea levels.
It's all a bunch of hooey.