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Sea Level Rise If All Polar Ice Melted: The Staggering Numbers

If **all ice on Earth melted**—Antarctica, Greenland, Arctic sea ice, glaciers, ice caps—global mean sea level would rise approximately **66–75 meters (216–246 feet)**. This is a geologic-scale scenario, not a near-term projection, but it defines the ultimate ceiling.

Breakdown by Source

Ice Reservoir	Volume (km³)	Sea Level Equivalent (m)	Notes
Antarctic Ice Sheet	26.5 million	57.9 m (190 ft)	90% of world's ice. East Antarctica (52 m) stable; West Antarctica (5.3 m) vulnerable.
Greenland Ice Sheet	2.9 million	7.4 m (24 ft)	Accelerating loss; irreversible above ~1.5–2°C warming.
Glaciers & Ice Caps (excl. Greenland/Antarctica)	180,000	0.4 m (1.3 ft)	Himalayas, Andes, Alps, Alaska, Arctic Canada, etc.
Arctic Sea Ice	~20,000 (seasonal)	~0 m	Floating ice—Archimedes: melting doesn't raise sea level (minor steric effect).
TOTAL	~29.6 million	~65.7 m (215 ft)	IPCC AR6 / USGS consensus range: 65–75 m.

Timescales: Not Overnight

Centuries to millennia. Even under high emissions, complete melt takes **>1,000 years** (likely 3,000–10,000+).
Committed rise: Past emissions already lock in ~1.5–2 m over centuries.
Rate matters: Current rate ~4.5 mm/yr (accelerating). 1 m by 2100 possible under high emissions.

Impacts of Partial Rise (The Real Concern)

Rise	Impacts
0.5–1 m (by 2100)	Displaces 100–200M people; inundates major deltas (Mekong, Ganges, Nile, Mississippi), small islands, coastal cities (Miami, Shanghai, Amsterdam, Lagos, Jakarta). $10T+ assets at risk.
2–3 m	Submerges most barrier islands, much of Florida, Bangladesh, Netherlands, Pacific atolls. Requires massive relocation.
10+ m	Rewrites world map. Inland seas return. Most coastal megacities gone.

Key Nuances

Regional variation: Gravitational/rotational effects mean melt from Antarctica raises sea level *more* in Northern Hemisphere; Greenland melt raises it *more* in Southern Hemisphere.
Vertical land motion: Subsidence (Jakarta, New Orleans, Tokyo) adds to relative rise; rebound (Scandinavia, Canada) subtracts.
Ice shelf buttressing: Floating ice shelves hold back land ice. Collapse (e.g., Larsen B, Thwaites "Doomsday Glacier") accelerates flow.

Bottom Line

**Total melt = ~66–75 m rise.** But **we don't need total melt for catastrophe.** Every 10 cm displaces millions. The trajectory is set by emissions *this decade*. The ice sheets have inertia—but they have tipping points too.

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