Again, this is due to strong storms, erosion, flooding, and the changing sand-scape of the islands. The sea levels are not rising; the islands are being eroded away due to intense storms and tidal shifts.

Now, everything is lumped together as "climate change", and folks sometimes confuse this with "rising sea levels" and "global warming", though these are separate theoretical phenomenon. What we are seeing here is what we see on Cape Cod. Shifting sands, and sand bars, and even islands, disappearing into the ocean as storms blow through and the pathways taken by the tide shift accordingly. The sea level is not rising, though land is vanishing; however in other places, the same weather patterns can cause new land to form.