Updated Sea Level Rise Projections Threaten 300 Million Homes
New research projects sea levels could rise up to 2 meters by 2100, threatening 300 million homes worldwide. Coastal cities are accelerating adaptation planning as the timeline for action shrinks.
By Aisha Patel - Health & Science Correspondent
Last Updated: December 16, 2025
Sea level rise projections
Updated Projections
The latest IPCC update projects 0.5-2 meters of sea level rise by 2100, depending on emissions trajectories. Antarctic ice sheet instability could push the upper bound even higher.
Population at Risk
Over 300 million people live in areas that will flood frequently by 2100. Major cities at risk include Miami, New York, Mumbai, Shanghai, and Tokyo.
Adaptation Urgency
Coastal defenses, managed retreat, and building restrictions are being implemented in vulnerable areas. The economic cost of adaptation will reach trillions of dollars.