The combined effects of subsidence and sea-level rise pose significant risks to coastal communities, including increased flooding and damage to infrastructure. In the U.S., cities like New Orleans, Houston, and Norfolk are particularly vulnerable, with subsidence lowering ground levels and amplifying flood risks. Globally, cities such as Jakarta and Shanghai face similar challenges, threatening millions of residents and critical infrastructure. These compounded risks demand immediate attention to safeguard affected populations and reduce long-term impacts.