
US coasts now experience 300–900% more high-tide flooding events than in 1950, driven by roughly 8 inches of sea level rise since 1900 — accelerating rapidly.
Miami faces 2–3 feet of sea level rise by 2060. NYC subway tunnels and airports flood at tide surges above 4 feet. Adaptation costs run into tens of billions.
Louisiana loses a football field of coastal land every 100 minutes to erosion and subsidence — 2,000 square miles of wetlands vanished since 1932.