It’s not just beaches and sand that are disappearing as the ocean pushes inland. Sea level rise is also eating away at California’s coastal cliffs. The question is by how much, as Californians have heavily developed and continue to build along the edge of the Pacific. Scientists are now one step closer to projecting how these bluffs will fare this century — and the outlook is sobering. In Southern California, cliffs could recede more than 130 feet by the year 2100 if the sea keeps rising, according to a new study led by the U.S. Geological Survey.