Miami's beachfront high-rises are sinking fast. It's a warning for coastal properties worldwide.

High-rises on barrier islands near Miami are sinking, a new study found.

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• Luxury 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...