It's also worth mentioning 2 more points:

1. not only will sea levels rise, but as glaciers melt, they'll disrupt the composition of the ocean itself. Glaciers are fresh-water, while most of the ocean is salt water. This will, inevitably, lead to significant oceanic ecosystem disruptions and potentially many more extinctions;
2. rising sea levels will also have a dramatic impact on global weather patterns. It's hard to predict what those will be, but we should expect more unpredictable weather shifts, stronger storms, and more anamolous "once in a century" weather events becoming significantly more commonplace.

So, in reality, the situation is much more dire than just sea level rise. We're at the liminal precipice, now, of the Holocene Extinction. Buckle in, because shit's gonna get real weird.