“Large-scale resettlement due to rising sea levels is no longer a thought experiment, some hypothetical slow-motion calamity in the hazy future engulfing remote coastal villages. This is Mumbai and Shanghai. This is Piazza San Marco in Venice. This is Manhattan and Miami.” Zachary Slobig visits Gardi Sugdub, a community in the Guna Yala archipelago of Panama looking to relocate to the mainland.