Seas are rising, and so is action in coastal communities to prepare. The uncertain timing of rising seas, difficulties evaluating long-term rise while facing more immediate causes of flooding such as typhoons and fluvial flooding, and simply the threat of permanent inundation of coastal zones settled for hundreds or thousands of years presents unprecedented challenges. As in all sectors impacted by anthropogenic climate change, working with others facing novel challenges to share progress and difficulties, collaborate regionally, and build competence and confidence in finding solutions can be invaluable.