How would sea level change if all glaciers melted?

There is still some uncertainty about the full volume of glaciers and ice caps on Earth, but if all of them were to melt, global sea level would rise approximately 70 meters (approximately 230 feet), flooding every coastal city on the planet.

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A satellite tagged Pacific walrus on a piece of sea ice
November 30, 2000

A satellite tagged Pacific walrus on a piece of sea ice

A satellite tagged Pacific walrus on a piece of sea ice

National Parks that could be threatened by higher sea level

National Parks that could be threatened by higher sea level

National Parks and Seashores on coasts that could be affected by future sea level rise.

Last-interglacial sea level as determined by dated corals

Last-interglacial sea level as determined by dated corals

Elevations of corals we have dated from last-interglacial marine deposits on tectonically stable coastlines indicate a paleo-sea level of +5 meters to +10 meters.