High-rises on barrier islands near Miami are sinking, a new study found.Hoberman Collection/Universal Images Group via Getty ImagesLuxury beachfront high-rises on the coast of Miami's barrier islands are sinking, a new study found.Subsidence and rising seas are a global problem, affecting up to $109 billion of US coastal property by 2050.Satellites could spot buildings that are sinking or tilting for early intervention.Coastal properties worldwide are sinking, including some of Miami's pricey waterfront high-rises.In a study published in the journal Earth and Space Science in December, researchers found that 35 buildings along the coasts of Miami's barrier islands have sunk into the ground by 2 to 8 centimeters between 2016 and 2023.This sinking phenomenon, called subsidence, is happening "almost everywhere that we look," said Manoochehr Shirzaei, a geophysicist at Virginia Tech who was not involved in the Miami-area study.That sinking can lead to expensive — and sometimes deadly — damage and flooding in some of the most populated places on Earth.