Sea level rise is a horrible outcome of human-driven warming. But not in the way you may be thinking of it. It’s not so much a crashing apocalypse as it is a chronic problem, more like a slow cancer than a sudden heart attack. We still need to do all we can in order to prevent as much of it as possible, but we also need to realize that it’s going to take a long time. This is not to remove all concern about the issue, but rather to help us recognize that the slow pace of these changes can mask their seriousness. And it also means that this is going to bother us and our descendants for a very long time—probably for thousands of years.