For detailed amounts of sea level rise - past, present and future - see the page Water:Oceans, Past and Future Sea Level sections
From U.S. National Climate Assessment (2013).
World Meteorological Organization, 1021 - From State of the Climate in 2021
Note that sea level rise rate doubled (up 110%) over 20 years and accelereated a bit, up 51% in the past 10 years (20-year rate of 126%).
Where Seas Are Rising at Alarming Speed in US 0424.rtf
- 12 tide gauges spanning Texas to North Carolina, sea levels are at least 6 inches higher than they were in 2010.
Climate Change, Rising Seas Threaten Southern Iran’s Food Security 0126.rtf
New Orleans Relocation Must Start Now, due to Sea Level Rise 0526.rtf - New Orleans will be surrounded by ocean by 2100. New Orleans will be wholly below sea level and will likely disappear.Rising Sea Levels Threaten > 100 Million Buildings. Where Does Europe Stand? 1025.rtfMany Coastal Communities Are Flooding More than We Thought 0625.rtfSea Level Rise from 1.5°C Will Cause ‘Catastrophic Inland Migration 0525.rtfStudy Projects Climate-Driven Flooding for 1,000s of New Jersey Homes 0425.rtfNew Elevation Data Show 2-Meter Sea Rise to Cover Up to 140% More Area 0123.rtfRising Seas & Land-Based Salt Pollution Pose Dual Threats for Drinking Water 0325.rtfRenewed Concern Sea-Level Rise Will Flood Philadelphia Drinking-Water Intakes 0325.rtfClimate Change Coming for Coastlines, from Ancient Cities to Modern California 0225.rtf‘Ironic’ - Climate-Driven Sea Level Rise Will Overwhelm Major Oil Ports 0125.rtfOceans Overflowing, UN Chief Issues Global SOS for Pacific Sea-Level Rise 0824.rtfIn Charleston, South Carolina, Floods Are a ‘Constant Existential Fear’ 0824.rtfRising Sea Levels Will Disrupt Millions of Americans’ Lives by 2050 - 0624.rtfClick for moreSea Leve Rise 2.3 or 3.9 Meters per °C - Levermann 0613.pdf
Figures A-D represent 4 ice sources.
A: sea water expansion.
B: mountain (non-polar) glaciers.
C: Greenland.
D: Antarctica.
E: Total.
Note that paleoclimate studies (indirect observations) have found much higher sea level rise per °C warming than Levermann's models do. The difference stems from Antarctica.
Also, like Levermann's, much published research leaves unclear if warming is surface or the entire ocean. Stated differently, they assume than air at the land and sea surface warms as fast as the water in the ocean. Since 1960, land and sea surfaces have warmed 25 (recently) to 50 times (not as recently) as fast the whole ocean.
See, for example, "Climate Sensitivity, Sea Level & Atmospheric CO2“ - Hansen 0913 on Overviews page for sea level and Deep Ocean Temperatures (3rd graph on Home page, also on Overviews page & 2nd graph on Heat page).
For a 2nd example, see Tripati (2009) on Heat page: 3-6°C warmer and seas 25-40 meters higher (7-8 meters per °C) - for essentially today's CO2 levels. For a 3rd example, connect 120-meter sea level rise since the last galcial maximum (see graph above) to warming since then from Vostok ice core data. Vostok data shows 8-10°C warming over that time span (at the polar surface, but ~ 3 to 5°C warming for the deep ocean. (This comes from Hansen's book chapter in Springer, 2012, which has part 3 of 3-part graph (part 1 is on Home page and parts 1-2 on Overviews page)).
What Sea Level Rise Looks Like for 24 US Cities 0413.rtf
96 interactive inundation maps are on the web here. Here are excerpts: Miami, New York, Norfolk, & Sacramento (also on Water page).
Present Levels
+5 feet
+12 Feet
+25 Feet
Palm Beach Must Act on Rising Sea Levels 0213.rtf - Map is from elsewhere.
GIS = Greenland Ice Sheet
WAIS = West Antarctic Ice Sheet
EAIS = East Antarctic Ice Sheet
One of the most pressing questions in climate science today is how high will sea level rise in the coming decades. As global temperatures continue to increase, melting ice sheets and expanding ocean water are causing sea levels to rise at an accelerating rate.
Understanding these projections is crucial for preparing coastal communities and protecting ecosystems worldwide.
Sea level rise is primarily driven by two factors: the melting of glaciers and polar ice caps, and the thermal expansion of seawater as it warms. This process is closely linked to global warming, which intensifies both ice melt and ocean heating.
Understanding how high the sea level will rise also emphasizes the importance of climate action. Reducing carbon emissions, transitioning to renewable energy, and protecting natural barriers like mangroves and wetlands can help slow the rate of rise and reduce its impact.
In conclusion, the exact answer to how high will sea level rise depends on future human actions. However, the trend is clear—sea levels are rising, and the pace is increasing. By taking immediate steps to mitigate climate change and adapt to its effects, we can reduce risks and protect vulnerable coastal regions for future generations.
Section Map: Weather & Sea Level Rise