California's Dunes Vanish: 60% Lost in 165 Years

California has experienced a dramatic loss of its coastal sand dunes, with over 60% disappearing since the mid-1800s. Researchers utilized historical maps and modern aerial imagery to track these changes, revealing that urban development and land-use shifts are the primary culprits. This extensive decline not only reduces natural defenses against storms and rising sea levels but also severely impacts habitats for local wildlife.

The extent of dune loss varies significantly across the state, with Southern California seeing the most drastic reduction at approximately 95%. Central California has lost around 60%, while Northern California remains relatively stable. A concerning finding is that about half of the remaining dunes are now isolated, cut off by infrastructure and transportation networks.

Beyond development, habitat change and erosion have contributed to dune loss, though to a lesser extent. The study emphasizes that human activity, including settlement and infrastructure expansion, has been the overwhelming driver. Restoration projects are being explored as a viable adaptation strategy to mitigate climate change impacts and biodiversity loss.