Sea level rise is not some future dystopian fantasy. It is here on the California coast. At high tide, water gushes over stairways leading down bluff trails to beaches and up to some oceanfront homes. Seawater routinely sloshes over Highway 1 between Eureka and Arcata along the northern coast. Homes in some towns already flood. Others perch precariously on crumbling bluffs. Sea walls erected to protect oceanfront homes (for a while) end up accelerating the erosion of public beaches on the other side of those walls.