Hurricanes form when tropical seas convert warm, heat-laden water into wind, rain, and waves, and the film asks why a rare few escalate into the monster storms that flatten coastlines. It traces two converging trends: warming oceans adding fuel to storm systems, and a global rush toward the coasts that puts more people in the path. In the United States alone, 39% of the population now lives in coastal counties, and a Columbia University report maps the world's worst-exposed hot spots, including the eastern seaboard of North America, Bangladesh, the Philippines, and China's east coast. The film runs the numbers on what happens when storm meets density: Hurricane Andrew's $45 billion hit on Miami in 1992, Ike's $28 billion strike on Galveston in 2008, Sandy's $60 billion damage to New Jersey in 2012, and Katrina's $106 billion toll on New Orleans, all in 2010 dollars. With sea levels projected to rise by up to a meter by century's end, the film treats storm surge as the next multiplier on an already rising bill.