The global average sea level has risen about 250 millimetres (9.8 in) since 1880.[1]

Between 1901 and 2018, the average global sea level rose by 15–25 cm (6–10 in), or an average of 1–2 mm per year.[2] This rate accelerated to 4.62 mm/yr for the decade 2013–2022.[3] Climate change due to human activities is the main cause.[4]:5,8 Between 1993 and 2018, thermal expansion of water accounted for 42% of sea level rise. Melting temperate glaciers accounted for 21%, with Greenland accounting for 15% and Antarctica 8%.[5]:1576 Sea level rise lags changes in the Earth's temperature. So sea level rise will continue to accelerate between now and 2050 in response to warming that is already happening.[6] What happens after that will depend on what happens with human greenhouse gas emissions. Sea level rise may slow down between 2050 and 2100 if there are deep cuts in emissions. It could then reach a little over 30 cm (1 ft) from now by 2100. With high emissions it may accelerate. It could rise by 1 m (3+12 ft) or even 2 m (6+12 ft) by then.[4][7] In the long run, sea level rise would amount to 2–3 m (7–10 ft) over the next 2000 years if warming amounts to 1.5 °C (2.7 °F). It would be 19–22 metres (62–72 ft) if warming peaks at 5 °C (9.0 °F).[4]:21

Rising seas ultimately impact every coastal and island population on Earth.[8][9] This can be through flooding, higher storm surges, king tides, and tsunamis. These have many follow-on effects. They lead to loss of coastal ecosystems like mangroves. Crop production falls because of salinization of irrigation water and damage to ports disrupts sea trade.[10][11][12] The sea level rise projected by 2050 will expose places currently inhabited by tens of millions of people to annual flooding. Without a sharp reduction in greenhouse gas emissions, this may increase to hundreds of millions in the latter decades of the century.[13] Areas not directly exposed to rising sea levels could be affected by large scale migrations and economic disruption.

At the same time, local factors like tidal range or land subsidence, as well as the varying resilience and adaptive capacity of individual ecosystems, sectors, and countries will greatly affect the severity of impacts.[14] For instance, sea level rise in the United States (particularly along the US East Coast) is already higher than the global average, and is expected to be 2 to 3 times greater than the global average by the end of the century.[15][16] Yet, of the 20 countries with the greatest exposure to sea level rise, 12 are in Asia. Bangladesh, China, India, Indonesia, Japan, the Philippines, Thailand and Vietnam collectively account for 70% of the global population exposed to sea level rise and land subsidence.[17] Finally, the greatest near-term impact on human populations will occur in the low-lying Caribbean and Pacific islands—many of those would be rendered uninhabitable by sea level rise later this century.[18]

Societies can adapt to sea level rise in three ways: by managed retreat, by accommodating coastal change, or by protecting against sea level rise through hard-construction practices like seawalls[19] or soft approaches such as dune rehabilitation and beach nourishment. Sometimes these adaptation strategies go hand in hand; at other times choices must be made among different strategies.[20] A managed retreat strategy is difficult if an area's population is quickly increasing: this is a particularly acute problem for Africa, where the population of low-lying coastal areas is projected to increase by around 100 million people within the next 40 years.[21] Poorer nations may also struggle to implement the same approaches to adapt to sea level rise as richer states, and sea level rise at some locations may be compounded by other environmental issues, such as subsidence in so-called sinking cities.[22] Coastal ecosystems typically adapt to rising sea levels by moving inland; but may not always be able to do so, due to natural or artificial barriers.[23]

Observations

Between 1901 and 2018, the global mean sea level rose by about 20 cm (or 8 inches).[4] More precise data gathered from satellite radar measurements found a rise of 7.5 cm (3 in) from 1993 to 2017 (average of 2.9 mm/yr).[5] This accelerated to 4.62 mm/yr for 2013–2022.[3]

Regional variations

Sea level rise is not uniform around the globe. Some land masses are moving up or down as a consequence of subsidence (land sinking or settling) or post-glacial rebound (land rising as melting ice reduces weight). Therefore, local relative sea level rise may be higher or lower than the global average. Changing ice masses also affect the distribution of sea water around the globe through gravity.[25][26]

When a glacier or ice sheet melts, it loses mass. This reduces its gravitational pull. In some places near current and former glaciers and ice sheets, this has caused water levels to drop. At the same time water levels will increase more than average further away from the ice sheet. Thus ice loss in Greenland affects regional sea level differently than the equivalent loss in Antarctica.[27] On the other hand, the Atlantic is warming at a faster pace than the Pacific. This has consequences for Europe and the U.S. East Coast. The East Coast sea level is rising at 3–4 times the global average.[28] Scientists have linked extreme regional sea level rise on the US Northeast Coast to the downturn of the Atlantic meridional overturning circulation (AMOC).[29]

Many ports, urban conglomerations, and agricultural regions stand on river deltas. Here land subsidence contributes to much higher relative sea level rise. Unsustainable extraction of groundwater and oil and gas is one cause. Levees and other flood management practices are another. They prevent sediments from accumulating. These would otherwise compensate for the natural settling of deltaic soils.[30]:638[31]:88 Estimates for total human-caused subsidence in the Rhine-Meuse-Scheldt delta (Netherlands) are 3–4 m (10–13 ft), over 3 m (10 ft) in urban areas of the Mississippi River Delta (New Orleans), and over 9 m (30 ft) in the Sacramento–San Joaquin River Delta.[31]:81–90 On the other hand, relative sea level around the Hudson Bay in Canada and the northern Baltic is falling due to post-glacial isostatic rebound.[32]

Projections

A comparison of SLR in six parts of the US. The Gulf Coast and East Coast see the most SLR, whereas the West Coast the least
NOAA predicts different levels of sea level rise through 2050 for several US coastlines.[16]

There are two complementary ways to model sea level rise (SLR) and project the future. The first uses process-based modeling. This combines all relevant and well-understood physical processes in a global physical model. This approach calculates the contributions of ice sheets with an ice-sheet model and computes rising sea temperature and expansion with a general circulation model. The processes are not fully understood. But this approach can predict non-linearities and long delays in the response, which studies of the recent past will miss.

The other approach employs semi-empirical techniques. These use historical geological data to determine likely sea level responses to a warming world, and some basic physical modeling.[33] These semi-empirical sea level models rely on statistical techniques. They use relationships between observed past contributions to global mean sea level and temperature.[34] Scientists developed this type of modeling because most physical models in previous Intergovernmental Panel on Climate Change (IPCC) literature assessments had underestimated the amount of sea level rise compared to 20th century observations.[26]

Projections for the 21st century

Historical sea level reconstruction and projections up to 2100 published in 2017 by the U.S. Global Change Research Program.[35] RCPs are different scenarios for future concentrations of greenhouse gases.

Intergovernmental Panel on Climate Change is the largest and most influential scientific organization on climate change, and since 1990, it provides several plausible scenarios of 21st century sea level rise in each of its major reports. The differences between scenarios are mainly due to uncertainty about future greenhouse gas emissions. These depend on future economic developments, and also future political action which is hard to predict. Each scenario provides an estimate for sea level rise as a range with a lower and upper limit to reflect the unknowns. The scenarios in the 2013-2014 Fifth Assessment Report (AR5) were called Representative Concentration Pathways, or RCPs and the scenarios in the IPCC Sixth Assessment Report (AR6) are known as Shared Socioeconomic Pathways, or SSPs. A large difference between the two was the addition of SSP1-1.9 to AR6, which represents meeting the best Paris climate agreement goal of 1.5 °C (2.7 °F). In that case, the likely range of sea level rise by 2100 is 28–55 cm (11–21+12 in).[7]

The lowest scenario in AR5, RCP2.6, would see greenhouse gas emissions low enough to meet the goal of limiting warming by 2100 to 2 °C. It shows sea level rise in 2100 of about 44 cm with a range of 28–61 cm. The "moderate" scenario, where CO2 emissions take a decade or two to peak and its atmospheric concentration does not plateau until 2070s is called RCP 4.5. Its likely range of sea level rise is 36–71 cm (14–28 in). The highest scenario in RCP8.5 pathway sea level would rise between 52 and 98 cm (20+12 and 38+12 in).[26][36] AR6 had equivalents for both scenarios, but it estimated larger sea level rise under both. In AR6, the SSP1-2.6 pathway results in a range of 32–62 cm (12+1224+12 in) by 2100. The "moderate" SSP2-4.5 results in a 44–76 cm (17+12–30 in) range by 2100 and SSP5-8.5 led to 65–101 cm (25+12–40 in).[7]

A set of older (2007-2012) projections of sea level rise. There was a wide range of estimates.
Sea level rise projections for the years 2030, 2050 and 2100 from 2007-2012

Further, AR5 was criticized by multiple researchers for excluding detailed estimates the impact of "low-confidence" processes like marine ice sheet and marine ice cliff instability,[37][38][39] which can substantially accelerate ice loss to potentially add "tens of centimeters" to sea level rise within this century.[26] AR6 includes a version of SSP5-8.5 where these processes take place, and in that case, sea level rise of over 2 m (6+12 ft) by 2100 could not be ruled out.[7] The general increase of projections in AR6 was caused by the observed ice-sheet erosion in Greenland and Antarctica matching the upper-end range of the AR5 projections by 2020,[40][41] and the finding that AR5 projections were likely too slow next to an extrapolation of observed sea level rise trends, while the subsequent reports had improved in this regard.[42]

Notably, some scientists believe that ice sheet processes may accelerate sea level rise even at temperatures below the highest possible scenario, though not as much. For instance, a 2017 study from the University of Melbourne researchers suggested that these processes increase RCP2.6 sea level rise by about one quarter, RCP4.5 sea level rise by one half and practically double RCP8.5 sea level rise.[43][44] A 2016 study led by Jim Hansen hypothesized that vulnerable ice sheet section collapse can lead to near-term exponential sea level rise acceleration, with a doubling time of 10, 20 or 40 years. Such acceleration would lead to multi-meter sea level rise in 50, 100 or 200 years, respectively.[39], but it remains a minority view amongst the scientific community.[45]

For comparison, a major scientific survey of 106 experts in 2020 found that even when accounting for instability processes they had estimated a median sea level rise of 45 cm (17+12 in) by 2100 for RCP2.6, with a 5%-95% range of 21–82 cm (8+1232+12 in). For RCP8.5, the experts estimated a median of 93 cm (36+12 in) by 2100 and a 5%-95% range of 45–165 cm (17+12–65 in).[46] Similarly, NOAA in 2022 had suggested that there is a 50% probability of 0.5 m (19+12 in) sea level rise by 2100 under 2 °C (3.6 °F), which increases to >80% to >99% under 3–5 °C (5.4–9.0 °F).[16] Year 2019 elicitation of 22 ice sheet experts suggested a median SLR of 30 cm (12 in) by 2050 and 70 cm (27+12 in) by 2100 in the low emission scenario and the median of 34 cm (13+12 in) by 2050 and 110 cm (43+12 in) by 2100 in a high emission scenario. They also estimated a small chance of sea levels exceeding 1 meter by 2100 even in the low emission scenario and of going beyond 2 metres in the high emission scenario, with the latter causing the displacement of 187 million people.[47]

Post-2100 sea level rise

If countries cut greenhouse gas emissions significantly (lowest trace), the IPCC expects sea level rise by 2100 to be limited to 0.3 to 0.6 meters (1–2 feet).[48] However, in a worst case scenario (top trace), sea levels could rise 5 meters (16 feet) by the year 2300.[48]
A map showing major SLR impact in south-east Asia, Northern Europe and the East Coast of the US
Map of the Earth with a long-term 6-metre (20 ft) sea level rise represented in red (uniform distribution, actual sea level rise will vary regionally and local adaptation measures will also have an effect on local sea levels).

Even if the temperature stabilizes, significant sea-level rise (SLR) will continue for centuries.[49] This is what models consistent with paleo records of sea level rise.[26]:1189 After 500 years, sea level rise from thermal expansion alone may have reached only half of its eventual level. Models suggest this may lie within ranges of 0.5–2 m (1+126+12 ft).[50] Additionally, tipping points of Greenland and Antarctica ice sheets are likely to play a larger role over such timescales.[51] Ice loss from Antarctica is likely to dominate very long-term SLR, especially if the warming exceeds 2 °C (3.6 °F). Continued carbon dioxide emissions from fossil fuel sources could cause additional tens of metres of sea level rise, over the next millennia. The available fossil fuel on Earth is enough to melt the entire Antarctic ice sheet, causing about 58 m (190 ft) of sea level rise.[52]

In the next 2,000 years, sea level is predicted to rise by 2–3 m (6+12–10 ft) if the temperature increase peaks at its current 1.5 °C (2.7 °F), It would rise by 2–6 m (6+1219+12 ft) if it peaks at 2 °C (3.6 °F) and by 19–22 m (62+12–72 ft) if it peaks at 5 °C (9.0 °F).[4]:SPM-28 If the temperature rise stops at 2 °C (3.6 °F) or at 5 °C (9.0 °F), the sea level would still continue to rise for about 10,000 years. In the first case it will reach 8–13 m (26–42+12 ft) above pre-industrial level, and in the second 28–37 m (92–121+12 ft).[53]

With better models and observational records, several studies have attempted to project SLR for the centuries immediately after 2100. This remains largely speculative. An April 2019 expert elicitation asked 22 experts about total sea level rise projections for the years 2200 and 2300 under its high, 5 °C warming scenario. It ended up with 90% confidence intervals of −10 cm (4 in) to 740 cm (24+12 ft) and −9 cm (3+12 in) to 970 cm (32 ft), respectively. Negative values represent the extremely low probability of very large increases in the ice sheet surface mass balance due to climate change-induced increase in precipitation.[47] An elicitation of 106 experts led by Stefan Rahmstorf also included 2300 for RCP2.6 and RCP8.5. The former had the median of 118 cm (46+12 in), and a 5%-95% range of 24–311 cm (9+12122+12 in). Tthe latter had the median of 329 cm (129+12 in), and a 5%-95% range of 88–783 cm (34+12308+12 in).[46]

By 2021, AR6 was also able to provide estimates for sea level rise in 2150 alongside the 2100 estimates for the first time. This showed that keeping warming at 1.5 °C under the SSP1-1.9 scenario would result in sea level rise in the 17-83% range of 37–86 cm (14+12–34 in). In the SSP1-2.6 pathway the range would be 46–99 cm (18–39 in), for SSP2-4.5 a 66–133 cm (26–52+12 in) range by 2100 and for SSP5-8.5 a rise of 98–188 cm (38+12–74 in). It stated that a "low-confidence" projection of over 2 m (6+12 ft) by 2100, would accelerate further to potentially 5 m (16+12 ft) by 2150. AR6 also provided lower-confidence estimates for year 2300 sea level rise under SSP1-2.6 and SSP5-8.5. The former had a range between 0.5 m (1+12 ft) and 3.2 m (10+12 ft), while the latter ranged from just under 2 m (6+12 ft) to just under 7 m (23 ft). The low-confidence projections of SSP5-8.5 project sea level rise exceeding 15 m (49 ft) by then.[7]

A 2018 paper estimated that sea level rise in 2300 would increase by a median of 20 cm (8 in) for every five years CO2 emissions increase before peaking. It shows a 5% likelihood of a 1 m (3+12 ft) increase due to the same. The same estimate found that if the temperature stabilized below 2 °C (3.6 °F), 2300 sea level rise would still exceed 1.5 m (5 ft). Early net zero and slowly falling temperatures could limit it to 70–120 cm (27+12–47 in).[54]

Measurements

Variations in the amount of water in the oceans, changes in its volume, or varying land elevation compared to the sea surface can drive sea level changes. Over a consistent time period, assessments can attribute contributions to sea level rise and provide early indications of change in trajectory. This helps to inform adaptation plans.[55] The different techniques used to measure changes in sea level do not measure exactly the same level. Tide gauges can only measure relative sea level. Satellites can also measure absolute sea level changes.[56] To get precise measurements for sea level, researchers studying the ice and oceans factor in ongoing deformations of the solid Earth. They look in particular at landmasses still rising from past ice masses retreating, and the Earth's gravity and rotation.[5]

Satellites

Jason-1 continued the sea surface measurements started by TOPEX/Poseidon. It was followed by the Ocean Surface Topography Mission on Jason-2, and by Jason-3.

Since the launch of TOPEX/Poseidon in 1992, an overlapping series of altimetric satellites has been continuously recording the sea level and its changes.[57] These satellites can measure the hills and valleys in the sea caused by currents and detect trends in their height. To measure the distance to the sea surface, the satellites send a microwave pulse towards Earth and record the time it takes to return after reflecting off the ocean's surface. Microwave radiometers correct the additional delay caused by water vapor in the atmosphere. Combining these data with the location of the spacecraft determines the sea-surface height to within a few centimetres.[58] These satellite measurements have estimated rates of sea level rise for 1993–2017 at 3.0 ± 0.4 millimetres (18 ± 164 in) per year.[59]

Satellites are useful for measuring regional variations in sea level. An example is the substantial rise between 1993 and 2012 in the western tropical Pacific. This sharp rise has been linked to increasing trade winds. These occur when the Pacific Decadal Oscillation (PDO) and the El Niño–Southern Oscillation (ENSO) change from one state to the other.[60] The PDO is a basin-wide climate pattern consisting of two phases, each commonly lasting 10 to 30 years. The ENSO has a shorter period of 2 to 7 years.[61]

Tide gauges

Between 1993 and 2018, the mean sea level has risen across most of the world ocean (blue colors).[62]

The global network of tide gauges is the other important source of sea-level observations. Compared to the satellite record, this record has major spatial gaps but covers a much longer period.[63] Coverage of tide gauges started mainly in the Northern Hemisphere. Data for the Southern Hemisphere remained scarce up to the 1970s.[63] The longest running sea-level measurements, NAP or Amsterdam Ordnance Datum were established in 1675, in Amsterdam.[64] Record collection is also extensive in Australia. They including measurements by an amateur meteorologist beginning in 1837. They also include measurements taken from a sea-level benchmark struck on a small cliff on the Isle of the Dead near the Port Arthur convict settlement in 1841.[65]

Together with satellite data for the period after 1992, this network established that global mean sea level rose 19.5 cm (7.7 in) between 1870 and 2004 at an average rate of about 1.44 mm/yr. (For the 20th century the average is 1.7 mm/yr.)[66] By 2018, data collected by Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO) had shown that the global mean sea level was rising by 3.2 mm (18 in) per year. This was double the average 20th century rate.[67][68] The 2023 World Meteorological Organization report found further acceleration to 4.62 mm/yr over the 2013–2022 period.[3] These observations help to check and verify predictions from climate change simulations.

Regional differences are also visible in the tide gauge data. Some are caused by local sea level differences. Others are due to vertical land movements. In Europe, only some land areas are rising while the others are sinking. Since 1970, most tidal stations have measured higher seas. However sea levels along the northern Baltic Sea have dropped due to post-glacial rebound.[69]

Past sea level rise

Changes in sea levels since the end of the last glacial episode

An understanding of past sea level is an important guide to where current changes in sea level will end up. In the recent geological past, thermal expansion from increased temperatures and changes in land ice are the dominant reasons of sea level rise. The last time that the Earth was 2 °C (3.6 °F) warmer than pre-industrial temperatures was 120,000 years ago. This was when warming due to Milankovitch cycles (changes in the amount of sunlight due to slow changes in the Earth's orbit) caused the Eemian interglacial. Sea levels during that warmer interglacial were at least 5 m (16 ft) higher than now.[70] The Eemian warming was sustained over a period of thousands of years. The size of the rise in sea level implies a large contribution from the Antarctic and Greenland ice sheets.[26]:1139 Levels of atmospheric carbon dioxide of around 400 parts per million (similar to 2000s) had increased temperature by over 2–3 °C (3.6–5.4 °F) around three million years ago. This temperature increase eventually melted one third of Antarctica's ice sheet, causing sea levels to rise 20 meters above the preindustrial levels.[71]

Since the Last Glacial Maximum, about 20,000 years ago, sea level has risen by more than 125 metres (410 ft). Rates vary from less than 1 mm/year during the pre-industrial era to 40+ mm/year when major ice sheets over Canada and Eurasia melted. Meltwater pulses are periods of fast sea level rise caused by the rapid disintegration of these ice sheets. The rate of sea level rise started to slow down about 8,200 years before today. Sea level was almost constant for the last 2,500 years. The recent trend of rising sea level started at the end of the 19th or beginning of the 20th century.[72]

Causes

A graph showing ice loss sea ice, ice shelves and land ice. Land ice loss contributetes to SLR
Earth lost 28 trillion tonnes of ice between 1994 and 2017: ice sheets and glaciers raised the global sea level by 34.6 ± 3.1 mm. The rate of ice loss has risen by 57% since the 1990s−from 0.8 to 1.2 trillion tonnes per year.[73]

The three main reasons warming causes global sea level to rise are the expansion of oceans due to heating, water inflow from melting ice sheets and water inflow from glaciers. Glacier retreat and ocean expansion have dominated sea level rise since the start of the 20th century.[33] Some of the losses from glaciers are offset when precipitation falls as snow, accumulates and over time forms glacial ice. If precipitation, surface processes and ice loss at the edge balance each other, sea level remains the same. Because of this precipitation began as water vapor evaporated from the ocean surface, effects of climate change on the water cycle can even increase ice build-up. However, this effect is not enough to fully offset ice losses, and sea level rise continues to accelerate.[21][74][75][76]

The contributions of the two large ice sheets, in Greenland and Antarctica, are likely to increase in the 21st century.[33] They store most of the land ice (~99.5%) and have a sea-level equivalent (SLE) of 7.4 m (24 ft 3 in) for Greenland and 58.3 m (191 ft 3 in) for Antarctica.[5] Thus, melting of all the ice on Earth would result in about 70 m (229 ft 8 in) of sea level rise,[77] although this would require at least 10,000 years and up to of global warming.[78][79]

Ocean heating

There has been an increase in ocean heat content during recent decades as the oceans absorb most of the excess heat created by human-induced global warming.[80]

The oceans store more than 90% of the extra heat added to Earth's climate system by climate change and act as a buffer against its effects. This means that the same amount of heat that would increase the average world ocean temperature by 0.01 °C (0.018 °F) would increase atmospheric temperature by approximately 10 °C (18 °F).[81] So a small change in the mean temperature of the ocean represents a very large change in the total heat content of the climate system. Winds and currents move heat into deeper parts of the ocean. Some of it reaches depths of more than 2,000 m (6,600 ft).[82]

When the ocean gains heat, the water expands and sea level rises. Warmer water and water under great pressure (due to depth) expand more than cooler water and water under less pressure.[26]:1161 Consequently cold Arctic Ocean water will expand less than warm tropical water. Different climate models present slightly different patterns of ocean heating. So their projections do not agree fully on how much ocean heating contributes to sea level rise.[83]

Antarctic ice loss

Processes around an Antarctic ice shelf
The Ross Ice Shelf is Antarctica's largest. It is about the size of France and up to several hundred metres thick.

The large volume of ice on the Antarctic continent stores around 60% of the world's fresh water - 90% once groundwater is excluded.[84] Antarctica is experiencing ice loss from coastal glaciers in the West Antarctica and some glaciers of East Antarctica, but it is gaining mass from the increased snow build-up inland, particularly in the East, which leads to contradicting trends.[76][85] There are different satellite methods for measuring ice mass and change, and combining them helps to reconcile the differences,[86] but there can still be variations between the studies. Thus, in 2018, a systematic review estimated average annual ice loss of 43 billion tons (Gt) across the entire continent between 1992 to 2002, which tripled to an annual average of 220 Gt from 2012 to 2017,[74][87] Subsequently, a 2021 analysis of data from four different research satellite systems (Envisat, European Remote-Sensing Satellite, GRACE and GRACE-FO and ICESat) indicated annual mass loss of only about 12 Gt from 2012-2016, due to much greater ice gain in East Antarctica than estimated earlier.[76]

In the future, it is known that West Antarctica at least will continue to lose mass, and the likely future losses of sea ice and ice shelves, which block warmer currents from direct contact with the ice sheet, can accelerate declines even in the East.[88][89] Altogether, Antarctica is the source of the largest uncertainty for future sea level projections.[90] By 2019, several studies attempted to estimate 2300 sea level rise caused by ice loss in Antarctica alone. They suggest a median rise of 16 cm (6+12 in) and maximum rise of 37 cm (14+12 in) under the low-emission scenario. The highest emission scenario results in a median rise of 1.46 m (5 ft) metres, with a minimum of 60 cm (2 ft) and a maximum of 2.89 m (9+12 ft)).[7]

East Antarctica

The world's largest potential source of sea level rise is the East Antarctic Ice Sheet (EAIS). It is 2.2 km thick on average and holds enough ice to raise global sea levels by 53.3 m (174 ft 10 in)[91] Its great thickness and high elevation make it more stable than the other ice sheets,[92] and as of early 2020s, most studies show that it is still gaining mass.[93][74][76][85] Some analyses have suggested it already begun to lose mass in 2000s,[94][75][89], but they over-extrapolated some observed losses onto the poorly-observed areas, and a more complete observational record shows continued mass gain.[76]

Aerial view of ice flows at Denman Glacier, one of the less stable glaciers in the East Antarctica

In spite of the net mass gain, some East Antarctica glaciers have lost ice in recent decades due to ocean warming and declining structural support from the local sea ice,[88] such as Denman Glacier,[95][96] and Totten Glacier.[97][98] Totten Glacier is particularly important because it stabilizes Aurora Subglacial Basin. Subglacial basins like Aurora and Wilkes Basin are major ice reservoirs which collectively contain comparable amounts of ice to the entirety of West Antarctica,[99] and are more vulnerable than the rest of East Antarctica.[38] Their collective tipping point probably lies around 3 °C (5.4 °F) of global warming, but it may be as high as 6 °C (11 °F), or as low as 2 °C (3.6 °F). Once this tipping point is crossed, the collapse of these subglacial basins could take place over as little as 500 or as much as 10,000 years. The median timeline is 2000 years.[78][79] Depending on how many subglacial basins are vulnerable, this causes sea level rise of between 1.4 m (4 ft 7 in) and 6.4 m (21 ft 0 in).[100]

On the other hand, the whole EAIS would not definitely collapse until global warming reaches 7.5 °C (13.5 °F), with a range between 5 °C (9.0 °F) and 10 °C (18 °F). It would take at least 10,000 years to disappear.[78][79] Some scientists have estimated that warming would have to reach at least 6 °C (11 °F) to melt two thirds of its volume.[101]

West Antarctica

Thwaites Glacier, with its vulnerable bedrock topography visible.

East Antarctica contains the largest potential source of sea level rise. However the West Antarctica ice sheet (WAIS) is substantially more vulnerable. Unlike East Antarctica and the Antarctic Peninsula, temperatures on West Antarctica have increased significantly. The trend is between 0.08 °C (0.14 °F) and 0.96 °C (1.73 °F) per decade between 1976 and 2012.[102] Satellite observations recorded a substantial increase in WAIS melting from 1992 to 2017. This resulted in 7.6 ± 3.9 mm (1964 ± 532 in) of Antarctica sea level rise. Outflow glaciers in the Amundsen Sea Embayment played a disproportionate role.[103]

The 2021 IPCC Sixth Assessment Report estimated that the median increase in sea level rise from the West Antarctic ice sheet melt by 2100 is ~11 cm (5 in). There is no difference between scenarios, because the increased warming would intensify the water cycle and increase snowfall accumulation over the ice sheet at about the same rate as it would increase ice loss. However, most of the bedrock underlying the WAIS lies well below sea level, and it has to be buttressed by the Thwaites and Pine Island glaciers. If these glaciers were to collapse, the entire ice sheet would as well.[38] Their disappearance would take at least several centuries, but is considered almost inevitable, as their bedrock topography deepens inland and becomes more vulnerable to meltwater.[104][105][106]

The contribution of these glaciers to global sea levels has already accelerated since the beginning of the 21st century. The Thwaites Glacier now accounts for 4% of global sea level rise.[104][107][108] It could start to lose even more ice if the Thwaites Ice Shelf fails, potentially in mid-2020s.[109] This is due to marine ice sheet instability hypothesis, where warm water enters between the seafloor and the base of the ice sheet once it is no longer heavy enough to displace the flow, causing accelerated melting and collapse.[110] Marine ice cliff instability, when ice cliffs with heights greater than 100 m (330 ft) collapse under their own weight once they are no longer buttressed by ice shelves, may also occur, though it has never been observed, and more detailed modelling has ruled it out.[111]

Other hard-to-model processes include hydrofracturing, where meltwater collects atop the ice sheet, pools into fractures and forces them open.[37] and changes in the ocean circulation at a smaller scale.[112][113][114] A combination of these processes could cause the WAIS to contribute as much as 41 cm (16 in) by 2100 under the low-emission scenario and 57 cm (22 in) under the highest-emission one.[7]

The melting of all the ice in West Antarctica would increase the total sea level rise to 4.3 m (14 ft 1 in).[115] However, mountain ice caps not in contact with water are less vulnerable than the majority of the ice sheet, which is located below the sea level. Its collapse would cause ~3.3 m (10 ft 10 in) of sea level rise.[116] This collapse is now considered practically inevitable, as it appears to have already occurred during the Eemian period 125,000 years ago, when temperatures were similar to the early 21st century.[117][118][119][120][121][114][122] This disappearance would take an estimated 2000 years. The absolute minimum for the loss of West Antarctica ice is 500 years, and the potential maximum is 13,000 years.[78][79]

The only way to stop ice loss from West Antarctica once triggered is by lowering the global temperature to 1 °C (1.8 °F) below the preindustrial level. This would be 2 °C (3.6 °F) below the temperature of 2020.[101] Other researchers suggested that a climate engineering intervention to stabilize the ice sheet's glaciers may delay its loss by centuries and give more time to adapt. However this is an uncertain proposal, and would end up as one of the most expensive projects ever attempted.[123][124]

Isostatic rebound

2021 research indicates that isostatic rebound after the loss of the main portion of the West Antarctic ice sheet would ultimately add another 1.02 m (3 ft 4 in) to global sea levels. While this effect would start to increase sea levels before 2100, it would take 1000 years for it to cause 83 cm (2 ft 9 in) of sea level rise - at which point, West Antarctica itself would be 610 m (2,001 ft 4 in) higher than now. Estimates of isostatic rebound after the loss of East Antarctica's subglacial basins suggest increases of between 8 cm (3.1 in) and 57 cm (1 ft 10 in)[100]

Greenland ice sheet loss

Greenland 2007 melt, measured as the difference between the number of days on which melting occurred in 2007 compared to the average annual melting days from 1988 to 2006[125]

Most ice on Greenland is in the Greenland ice sheet which is 3 km (10,000 ft) at its thickest. The rest of Greenland ice forms isolated glaciers and ice caps. The average annual ice loss in Greenland more than doubled in the early 21st century compared to the 20th century,[126] and its SLR contribution correspondingly increased from 0.07 mm per year between 1992 and 1997 to 0.68 mm per year between 2012 and 2017. The total ice loss from the Greenland Ice Sheet between 1992 and 2018 amounted to 3,902 gigatons (Gt) of ice, which is equivalent to a SLR contribution of 10.8 mm.[127] The contribution for the 2012–2016 period was equivalent to 37% of sea level rise from land ice sources (excluding thermal expansion).[128] This observed rate of ice sheet melting is at the higher end of predictions from the past IPCC assessment reports.[129][41]

In 2021, AR6 estimated that under the SSP1-2.6 emission scenario which largely fulfils the Paris Agreement goals, Greenland ice sheet melt adds around 6 cm (2+12 in) to global sea level rise by the end of the century, with a plausible maximum of 15 cm (6 in) (and even a very small chance of the ice sheet reducing the sea levels by around 2 cm (1 in) due to gaining mass through surface mass balance feedback). The scenario associated with the highest global warming, SSP5-8.5, would see Greenland add a minimum of 5 cm (2 in) to sea level rise, a likely median of 13 cm (5 in) cm and a plausible maximum of 23 cm (9 in).[7]

Trends of Greenland ice loss between 2002 and 2019[130]

Greenland's peripheral glaciers and ice caps crossed an irreversible tipping point around 1997, and already committed to unstoppable sea level rise.[131][132][133] Regardless of any future temperature change, the warming of 2000–2019 had already damaged the ice sheet enough for it to eventually lose ~3.3% of its volume, leading to 27 cm (10+12 in) of future sea level rise.[134] At a certain level of global warming, the Greenland ice sheet will almost completely melt, and the ice cores show this happened at least once during the last million years, even though the temperatures have not been higher than 2.5 °C (4.5 °F) greater than the preindustrial.[135][136]

2012 research suggested that the tipping point of the ice sheet was between 0.8 °C (1.4 °F) and 3.2 °C (5.8 °F),[137] but 2023 modelling has narrowed the tipping threshold to a 1.7 °C (3.1 °F)-2.3 °C (4.1 °F) range. If temperatures reach or exceed that level, than reducing the global temperature to 1.5 °C (2.7 °F) or lower (i.e. through large-scale carbon dioxide removal) will prevent the loss of the entire ice sheet, yet also result in a greater losses and sea level rise from Greenland than if the threshold was never breached in the first place.[138] Otherwise, the ice sheet would take between 10,000 and 15,000 years to disintegrate entirely once the tipping point had been crossed, with 10,000 years as the most likely estimate.[78][79] If climate change continues along its worst trajectory and the temperatures continue to increase at a fast rate for a long time, then this would be shortened to 1,000 years.[139]

Mountain glacier loss

Based on national pledges to reduce greenhouse gas emissions, global mean temperature is projected to increase by 2.7 °C (4.9 °F), which would cause loss of about half of Earth's glaciers by 2100—causing a sea level rise of 115±40 millimeters.[140]

There are roughly 200,000 glaciers on Earth, which are spread out across all continents.[141] Less than 1% of glacier ice is in mountain glaciers, compared to 99% in Greenland and Antarctica. However, this small size also makes mountain glaciers more vulnerable to melting than the larger ice sheets. This means they have had a disproportionate contribution to historical sea level rise and are set to contribute a smaller, but still significant fraction of sea level rise in the 21st century.[142] Observational and modelling studies of mass loss from glaciers and ice caps indicate a contribution to sea level rise of 0.2-0.4 mm per year, averaged over the 20th century.[143] The contribution for the 2012–2016 period was nearly as large as that of Greenland: 0.63 mm of sea level rise per year, equivalent to 34% of sea level rise from land ice sources.[128] Glaciers contributed around 40% to sea level rise during the 20th century, with estimates for the 21st century of around 30%.[5]

In 2023, a Science paper estimated that at 1.5 °C (2.7 °F), one quarter of mountain glacier mass would be lost by 2100 and nearly half would be lost at 4 °C (7.2 °F), contributing ~9 cm (3+12 in) and ~15 cm (6 in) to sea level rise, respectively. Because glacier mass is disproportionately concentrated in the most resilient glaciers, this would in practice remove between 49% and 83% of glacier formations. It had further estimated that the current likely trajectory of 2.7 °C (4.9 °F) would result in the SLR contribution of ~11 cm (4+12 in) by 2100.[144] Mountain glaciers are even more vulnerable over the longer term. In 2022, another Science paper estimated that almost no mountain glaciers can be expected to survive once the warming crosses 2 °C (3.6 °F), and their complete loss largely inevitable around 3 °C (5.4 °F): there is even a possibility of complete loss after 2100 at just 1.5 °C (2.7 °F). This could happen as early as 50 years after the tipping point is crossed, although 200 years is the most likely value, and the maximum is around 1000 years.[78][79]

Sea ice loss

Sea ice loss contributes very slightly to global sea level rise. If the melt water from ice floating in the sea was exactly the same as sea water then, according to Archimedes' principle, no rise would occur. However melted sea ice contains less dissolved salt than sea water and is therefore less dense, with a slightly greater volume per unit of mass. If all floating ice shelves and icebergs were to melt sea level would only rise by about 4 cm (1+12 in).[145]

Trends in land water storage from GRACE observations in gigatons per year, April 2002 to November 2014 (glaciers and ice sheets are excluded).

Changes to land water storage

Human activity impacts how much water is stored on land. Dams retain large quantities of water, which is stored on land rather than flowing into the sea (even though the total quantity stored will vary somewhat from time to time). On the other hand, humans extract water from lakes, wetlands and underground reservoirs for food production, which often causes subsidence. Furthermore, the hydrological cycle is influenced by climate change and deforestation, which can lead to further positive and negative contributions to sea level rise. In the 20th century, these processes roughly balanced, but dam building has slowed down and is expected to stay low for the 21st century.[146][26]:1155

Water redistribution caused by irrigation from 1993 to 2010 caused a drift of Earth's rotational pole by 78.48 centimetres (30.90 in), causing an amount of groundwater depletion equivalent to a global sea level rise of 6.24 millimetres (0.246 in).[147]

Impacts

High tide flooding, also called tidal flooding, has become much more common in the past seven decades.[148]

The impacts of sea level rise include higher and more frequent high-tide and storm-surge flooding, increased coastal erosion, inhibition of primary production processes, more extensive coastal inundation, along with changes in surface water quality and groundwater. These can lead to a greater loss of property and coastal habitats, loss of life during floods and loss of cultural resources. Agriculture and aquaculture can also be impacted. There can also be loss of tourism, recreation, and transport related functions.[10]:356 Coastal flooding impacts are exacerbated by land use changes such as urbanisation or deforestation of low-lying coastal zones. Regions that are already vulnerable to the rising sea level also struggle with coastal flooding washing away land and altering the landscape.[149]

Because the projected extent of sea level rise by 2050 will be only slightly affected by any changes in emissions,[6] there is confidence that 2050 levels of SLR combined with the 2010 population distribution (i.e. absent the effects of population growth and human migration) would result in ~150 million people under the water line during high tide and ~300 million in places which are flooded every year—an increase of 40 and 50 million people relative to 2010 values for the same.[13][150] By 2100, there would be another 40 million people under the water line during high tide if sea level rise remains low, and 80 million for a high estimate of the median sea level rise.[13] If ice sheet processes under the highest emission scenario result in sea level rise of well over one metre (3+14 ft) by 2100, with a chance of levels over two metres (6+12 ft),[16][4]:TS-45 then as many as 520 million additional people would end up under the water line during high tide and 640 million in places which are flooded every year, when compared to the 2010 population distribution.[13]

Major cities threatened by sea level rise. The cities indicated are under threat of even a small sea level rise (of 1.6 feet/49 cm) compared to the level in 2010. Even moderate projections indicate that such a rise will have occurred by 2060.[151][152]

Over the longer term, coastal areas are particularly vulnerable to rising sea levels, changes in the frequency and intensity of storms, increased precipitation, and rising ocean temperatures. Ten percent of the world's population live in coastal areas that are less than 10 metres (33 ft) above sea level. Furthermore, two-thirds of the world's cities with over five million people are located in these low-lying coastal areas.[153] In total, approximately 600 million people live directly on the coast around the world.[154] Cities such as Miami, Rio de Janeiro, Osaka and Shanghai will be especially vulnerable later in the century under the warming of 3 °C (5.4 °F), which is close to the current trajectory.[12][36] Altogether, LiDAR-based research had established in 2021 that 267 million people worldwide lived on land less than 2 m (6+12 ft) above sea level and that with a 1 m (3+12 ft) sea level rise and zero population growth, that number could increase to 410 million people.[155][156]

Even populations who live further inland may be impacted by a potential disruption of sea trade, and by migrations. In 2023, United Nations secretary general António Guterres warned that sea level rises risk causing human migrations on a "biblical scale".[157] Sea level rise will inevitably affect ports, but the current research into this subject is limited. Not enough is known about the investments required to protect the ports currently in use, and for how they may be protected before it becomes more reasonable to build new port facilities elsewhere.[158][159] Moreover, some coastal regions are rich agricultural lands, whose loss to the sea can result in food shortages elsewhere. This is a particularly acute issue for river deltas such as Nile Delta in Egypt and Red River and Mekong Deltas in Vietnam, which are disproportionately affected by saltwater intrusion into the soil and irrigation water.[160][161]

Ecosystems

Bramble Cay melomys, the first known mammal species to go extinct due to sea level rise.

When seawater reaches inland, coastal plants, birds, and freshwater/estuarine fish are threatened with habitat loss due to flooding and soil/water salinization.[162] So-called ghost forests emerge when coastal forest areas become inundated with saltwater to the point no trees can survive.[163][164] Starting around 2050, some nesting sites in Florida, Cuba, Ecuador and the island of Sint Eustatius for leatherback, loggerhead, hawksbill, green and olive ridley turtles are expected to be flooded, and the proportion would only increase over time.[165] And in 2016, Bramble Cay islet in the Great Barrier Reef was inundated, flooding the habitat of a rodent named Bramble Cay melomys.[166] In 2019, it was officially declared extinct.[167]

An example of mangrove pneumatophores.

While some ecosystems can move land inward with the high-water mark, many are prevented from migrating due to natural or artificial barriers. This coastal narrowing, sometimes called 'coastal squeeze' when considering human-made barriers, could result in the loss of habitats such as mudflats and tidal marshes.[23][168] Mangrove ecosystems on the mudflats of tropical coasts nurture high biodiversity, yet they are particularly vulnerable due to mangrove plants' reliance on breathing roots or pneumatophores, which will be submerged if the rate is too rapid for them to migrate upward, resulting in the loss of an ecosystem.[169][170] [171][172][170] Both mangroves and tidal marshes protect against storm surges, waves and tsunamis, so their loss makes the effects of sea level rise worse.[173][174] Human activities, such as dam building, may restrict sediment supplies to wetlands, and thereby prevent natural adaptation processes. The loss of some tidal marshes is unavoidable as a consequence.[175]

Likewise, corals, important for bird and fish life, need to grow vertically to remain close to the sea surface in order to get enough energy from sunlight. The corals have so far been able to keep up the vertical growth with the rising seas, but might not be able to do so in the future.[176]

Regional impacts

Africa

Aerial view of the Tanzanian capital Dar Es Salaam

In Africa, risk from sea level rise is amplified by the future population growth. It is believed that 54.2 million people lived in the highly exposed low elevation coastal zones (LECZ) around 2000, but this number will effectively double to around 110 million people by 2030, and by 2060 it will be around 185 to 230 million people, depending on the extent of population growth. While the average regional sea level rise by 2060 will be around 21 cm (with climate change scenarios making little difference at that point), local geography and population trends interact to increase the exposure to hazards like 100-year floods in a complex way.[21]

Abidjan, the economic powerhouse of Ivory Coast
Maputo, the capital of Mozambique
Populations within 100-year floodplains.[21][T1 1]
Country 2000 2030 2060 Growth 2000–2060[T1 2]
Egypt7.413.820.70.28
Nigeria0.10.30.90.84
Senegal0.41.12.70.76
Benin0.10.61.61.12
Tanzania0.20.94.32.3
Somalia0.20.62.71.7
Cote d'Ivoire0.10.30.70.65
Mozambique0.71.42.50.36
  1. In millions of people. The second and third columns include both the effects of population growth and the increased extent of floodplains by that point.
  2. The increase in area's population and the highest plausible scenario of population growth.
A man looking out over the beach from a building destroyed by high tides in Chorkor, a suburb of Accra. Sunny day flooding caused by sea level rise, increases coastal erosion that destroys housing, infrastructure and natural ecosystems. A number of communities in Coastal Ghana are already experiencing the changing tides.

In the near term, some of the largest displacement is projected to occur in the East Africa region, where at least 750,000 people are likely to be displaced from the coasts between 2020 and 2050. It was also estimated that by 2050, 12 major African cities (Abidjan, Alexandria, Algiers, Cape Town, Casablanca, Dakar, Dar es Salaam, Durban, Lagos, Lomé, Luanda and Maputo) would collectively sustain cumulative damages of USD 65 billion for the "moderate" climate change scenario RCP4.5 and USD 86.5 billion for the high-emission scenario RCP8.5: the version of the high-emission scenario with additional impacts from high ice sheet instability would involve up to 137.5 billion USD in damages. Additional accounting for the "low-probability, high-damage events" may increase aggregate risks to USD 187 billion for the "moderate" RCP4.5, USD 206 billion for RCP8.5 and USD 397 billion under the high-end instability scenario.[21] In all of these estimates, the Egyptian city of Alexandria alone amounts for around half of this figure:[21] hundreds of thousands of people in its low-lying areas may already have to be relocated in the coming decade.[160] Across sub-Saharan Africa as a whole, damages from sea level rise could reach 2–4% of GDP by 2050, although this is strongly affected by the extent of future economic growth and adaptation.[21]

The remains of Leptis Magna amphitheater, with the sea visible in the background

In the longer term, Egypt, Mozambique and Tanzania are also projected to have the largest number of people affected by annual flooding amongst all African countries if global warming reaches 4 °C by the end of the century (a level associated with the RCP8.5 scenario). Under RCP8.5, 10 important cultural sites (Casbah of Algiers, Carthage Archaeological site, Kerkouane, Leptis Magna Archaeological site, Medina of Sousse, Medina of Tunis, Sabratha Archaeological site, Robben Island, Island of Saint-Louis and Tipasa) would be at risk of flooding and erosion by the end of the century, along with a total of 15 Ramsar sites and other natural heritage sites (Bao Bolong Wetland Reserve, Delta du Saloum National Park, Diawling National Park, Golfe de Boughrara, Kalissaye, Lagune de Ghar el Melh et Delta de la Mejerda, Marromeu Game Reserve, Parc Naturel des Mangroves du Fleuve Cacheu, Seal Ledges Provincial Nature Reserve, Sebkhet Halk Elmanzel et Oued Essed, Sebkhet Soliman, Réserve Naturelle d'Intérêt Communautaire de la Somone, Songor Biosphere Reserve, Tanbi Wetland Complex and Watamu Marine National Park).[21]

Asia

Matsukawaura Lagoon, located in Fukushima Prefecture of Honshu Island

As of 2022, it is estimated that 63 million people in the East and South Asia are already at risk from a 100-year flood, in large part due to inadequate coastal protection in many countries. This will be greatly exacerbated in the future: Asia has the largest population at risk from sea level and Bangladesh, China, India, Indonesia, Japan, Pakistan, the Philippines, Thailand and Vietnam alone account for 70% number of people exposed to sea level rise during the 21st century.[17][177] This is entirely due to the region's densely populated coasts, as the rate of sea level rise in Asia is generally similar to the global average. Exceptions include the Indo-Pacific region, where it had been around 10% faster since the 1990s, and the coast of China, where globally "extreme" sea level rise had been detected since the 1980s, and it is believed that the difference between and of global warming would have a disproportionate impact on flood frequency. It is also estimated that future sea level rise along the Japanese Honshu Island would be up to 25 cm faster than the global average under RCP8.5, the intense climate change scenario. RCP8.5 is additionally associated with the loss of at least a third of the Japanese beaches and 57–72% of Thai beaches.[17]

One estimate finds that Asia will suffer direct economic damages of 167.6 billion USD at 0.47 meters of sea level rise, 272.3 billion USD at 1.12 meters and 338.1 billion USD at 1.75 meters (along with the indirect impact of 8.5, 24 or 15 billion USD from population displacement at those levels), with China, India, the Republic of Korea, Japan, Indonesia and Russia experiencing the largest economic losses. Out of the 20 coastal cities expected to see the highest flood losses by 2050, 13 are in Asia. For nine of those (Bangkok, Guangzhou, Ho Chi Minh City, Jakarta, Kolkata, Nagoya, Tianjin, Xiamen and Zhanjiang) sea level rise would be compounded by subsidence. By 2050, Guangzhou would see 0.2 meters of sea level rise and the estimated annual economic losses of 254 million USD – the highest in the world. One estimate calculates that in the absence of adaptation, cumulative economic losses caused by sea level rise in Guangzhou under RCP8.5 would reach ~331 billion USD by 2050, ~660 billion USD by 2070 and 1.4 trillion USD by 2100, while the impact of high-end ice sheet instability would increase these figures to ~420 billion USD, ~840 billion USD and ~1.8 trillion USD, respectively. In Shanghai, coastal inundation amounts to ~0.03% of local GDP; but would increase to 0.8% (confidence interval of 0.4–1.4%) by 2100 even under the "moderate" RCP4.5 scenario in the absence of adaptation. Likewise, failing to adapt to sea level rise in Mumbai would result in the damages of 112–162 billion USD by 2050, which would nearly triple by 2070. As the result, efforts like the Mumbai Coastal Road are being implemented, although they are likely to affect coastal ecosystems and fishing livelihoods.[17] Nations with extensive rice production along the coasts like Bangladesh, Vietnam and China are already seeing adverse impacts from saltwater intrusion.[178]

It is estimated that sea level rise in Bangladesh may force the relocation of up to one-third of power plants as early as 2030, while a similar proportion would have to deal with the increased salinity of their cooling water by then. Research from 2010s indicates that by 2050, between 0.9 and 2.1 million people would be displaced by sea level rise alone: this would likely necessitate the creation of ~594,000 additional jobs and ~197,000 housing units in the areas receiving the displaced persons, as well as to secure the supply of additional ~783 billion calories worth of food.[17] In 2021, another paper estimated that 816,000 would be directly displaced by sea level rise by 2050, but this would be increased to 1,3 million when the indirect effects are taken into account.[179] Both studies assume that the majority of the displaced people would travel to the other areas of Bangladesh, and attempt to estimate population changes in different localities.

2010 estimates of population exposure to sea level rise in Bangladesh
Net Variations in the Population Due to Sea Level Rise in 2050 in Selected Districts.[179]
District Net flux (Davis et al., 2018) Net flux (De Lellis et al., 2021) Rank (Davis et al., 2018)[T2 1] Rank (De Lellis et al., 2021)
Dhaka207,373−34, 060111
Narayanganj−95,003−126,69421
Shariatpur−80,916−124,44433
Barisal−80,669−64,25246
Munshiganj−77,916−124,59852
Madaripur61,791−937660
Chandpur−37,711−70,99874
Jhalakati35,5469,198836
Satkhira−32,287−19,603923
Khulna−28,148−9,9821033
Cox's Bazar−25,680−16,3661124
Bagherat24,86012,2631228
  1. Refers to the magnitude of population change relative to the other districts.

In an attempt to address these challenges, the Bangladesh Delta Plan 2100 has been launched in 2018.[180][181] As of 2020, it was seen falling short of most of its initial targets.[182] The progress is being monitored.[183]

In 2019, the president of Indonesia, Joko Widodo, declared that the city of Jakarta is sinking to a degree that requires him to move the capital to another city.[184] A study conducted between 1982 and 2010 found that some areas of Jakarta have been sinking by as much as 28 cm (11 inches) per year[185] due to ground water drilling and the weight of its buildings, and the problem is now exacerbated by sea level rise. However, there are concerns that building in a new location will increase tropical deforestation.[186][187] Other so called sinking cities, such as Bangkok or Tokyo, are vulnerable to these compounding subsidence with sea level rise.[188]

Australasia

King's Beach at Caloundra

In Australia, erosion and flooding of Queensland's Sunshine Coast beaches is projected to intensify by 60% by 2030, with severe impacts on tourism in the absence of adaptation. Adaptation costs to sea level rise under the high-emission RCP8.5 scenario are projected to be three times greater than the adaptation costs to low-emission RCP2.6 scenario. For 0.2- to 0.3-m sea level rise (set to occur by 2050), what is currently a 100-year flood would occur every year in New Zealand cities of Wellington and Christchurch. Under 0.5 m sea level rise, the current 100-year flood in Australia would be likely to occur several times a year, while in New Zealand, buildings with a collective worth of NZ$12.75 billion would become exposed to new 100-year floods. A metre or so of sea level rise would threaten assets in New Zealand with a worth of NZD$25.5 billion (with a disproportionate impact on Maori-owned holdings and cultural heritage objects), and Australian assets with a worth of AUD$164–226 billion (including many unsealed roads and railway lines). The latter represents a 111% rise in Australia's inundation costs between 2020 and 2100.[189]

Central and South America

An aerial view of São Paulo's Port of Santos

By 2100, a minimum of 3-4 million people in South America would be directly affected by coastal flooding and erosion. 6% of the population of Venezuela, 56% of the population of Guyana (including in the capital, Georgetown, much of which is already below the sea level) and 68% of the population of Suriname are already living in low-lying areas exposed to sea level rise. In Brazil, the coastal ecoregion of Caatinga is responsible for 99% of its shrimp production, yet its unique conditions are threatened by a combination of sea level rise, ocean warming and ocean acidification. The port complex of Santa Catarina had been interrupted by extreme wave or wind behavior 76 times in one 6-year period in 2010s, with a 25,000-50,000 USD loss for each idle day. In Port of Santos, storm surges were three times more frequent between 2000 and 2016 than between 1928 and 1999.[190]

Europe

Many sandy coastlines in Europe are vulnerable to erosion caused by sea level rise. In Spain, Costa del Maresme is anticipated to retreat by 16 meters by 2050 relative to 2010, and potentially by 52 meters by 2100 under RCP8.5[191] Other vulnerable coastlines include Tyrrhenian Sea coast of Italy's Calabria region,[192] Barra-Vagueira coast in Portugal[193] and Nørlev Strand in Denmark.[194]

In France, it was estimated that 8,000-10,000 people would be forced to migrate away from the coasts by 2080.[195] The Italian city of Venice is located on islands. It is highly vulnerable to flooding and has already spent $6 billion on a barrier system.[196][197] A quarter of the German state of Schleswig-Holstein, inhabited by over 350,000 people, is at low elevation and has been vulnerable to flooding since the preindustrial times. Many levees already exist, but to its complex geography, a flexible mix of hard and soft measures was chosen, which is intended to support a safety margin of >1 meter rise per century.[198] In the United Kingdom, sea level at the end of the century would increase by 53 to 115 centimetres at the mouth of river Thames and 30 to 90 centimetres at Edinburgh.[199] To address this reality, it has divided its coast into 22 areas, each covered by a Shoreline Management Plan. Those are further sub-divided into 2000 management units in total, spanning across three "epochs" (0–20 years, 20-50 and 50–100 years).[198]

The Netherlands is a country that sits partially below sea level and is subsiding. It has responded by extending its Delta Works program.[200] Drafted in 2008, the Delta Commission report said that the country must plan for a rise in the North Sea up to 1.3 m (4 ft 3 in) by 2100 and plan for a 2–4 m (7–13 ft) rise by 2200.[201] It advised annual spending between €1.0 and €1.5 billion for measures such as broadening coastal dunes and strengthening sea and river dikes. Worst-case evacuation plans were also drawn up.[202]

North America

Tidal flooding in Miami during a king tide (October 17, 2016). The risk of tidal flooding increases with sea level rise.

As of 2017, around 95 million Americans lived on the coast: for Canada and Mexico, this figure amounts to 6.5 million and 19 million people. Increased chronic nuisance flooding and king tide flooding is already an issue in the highly vulnerable state of Florida,[203] as well as alongside the US East Coast.[204] On average, the number of days with tidal flooding in the USA increased 2 times in the years 2000-2020, reaching 3–7 days per year. In some areas the increase was much stronger: 4 times in the Southeast Atlantic and 11 times in the Western Gulf. By the year 2030 the average number is expected to be 7–15 days, reaching 25–75 days by 2050.[205] U.S. coastal cities have responded to that through beach nourishment or beach replenishment, where mined sand is trucked in and added, in addition to other adaptation measures such as zoning, restrictions on state funding, and building code standards.[206][207] Along an estimated 15% of the US coastline, the majority of local groundwater levels are already below the sea level. This places those groundwater reservoirs at risk of sea water intrusion, which renders fresh water unusable once its concentration exceeds 2-3%.[208] The damages are also widespread in Canada and will affect both major cities like Halifax and the more remote locations like Lennox Island, whose Mi'kmaq community is already considering relocation due to widespread coastal erosion. In Mexico, the damages from SLR to tourism hotspots like Cancun, Isla Mujeres, Playa del Carmen, Puerto Morelos and Cozumel could amount to 1.4–2.3 billion USD.[209] The increase in storm surge due to sea level rise is also a problem. For example, due to this effect Hurricane Sandy caused additional 8 billion dollars in damage, impacted 36,000 more houses and 71,000 more people.[210][211]

In the future, northern Gulf of Mexico, Atlantic Canada and the Pacific coast of Mexico would experience the greatest sea level rise. By 2030, flooding along the US Gulf Coast could cause economic losses of up to 176 billion USD: around 50 billion USD may be avoided through nature-based solutions like wetland restoration and oyster reef restoration.[209] By 2050, the frequency of coastal flooding in the US is expected to rise tenfold to four "moderate" flooding events per year, even without storms or heavy rainfall.[212][213] In the New York City, current 100-year flood would occur once in 19–68 years by 2050 and 4–60 years by 2080.[214] By 2050, 20 million people in the greater New York City area would be threatened, as 40% of the existing water treatment facilities would be compromised and 60% of power plants will need to be relocated. By 2100, sea level rise of 0.9 m (3 ft) and 1.8 m (6 ft) would threaten 4.2 and 13.1 million people in the US, respectively. In California alone, 2 m (6+12 ft) of SLR could affect 600,000 people and threaten over 150 billion USD in property with inundation, potentially representing over 6% of the state's GDP. In North Carolina, a meter of SLR inundates 42% of the Albemarle-Pamlico Peninsula, costing up to 14 billion USD (at 2016 value of the currency). In nine southeast US states, the same level of sea level rise would claim up to 13,000 historical and archaeological sites, including over 1000 sites eligible for inclusion in the National Register for Historic Places.[209]

Island nations

Malé, the capital island of Maldives.

Small island states are nations whose populations are concentrated on atolls and other low islands. Atolls on average reach 0.9–1.8 m (3–6 ft) above sea level.[215] This means that no other place is more vulnerable to coastal erosion, flooding and salt intrusion into soils and freshwater caused by sea level rise. The latter may render an island uninhabitable well before it is completely flooded.[216] Already, children in small island states are encountering hampered access to food and water and are suffering an increased rate of mental and social disorders due to these stressors.[217] At current rates, sea level would be high enough to make the Maldives uninhabitable by 2100,[218][219] while five of the Solomon Islands have already disappeared due to the combined effects of sea level rise and stronger trade winds that were pushing water into the Western Pacific.[220]

Surface area change of islands in the Central Pacific and Solomon Islands[221]

Adaptation to sea level rise is costly for small island nations as a large portion of their population lives in areas that are at risk.[222] Nations like Maldives, Kiribati and Tuvalu are already forced to consider controlled international migration of their population in response to rising seas,[223] since the alternative of uncontrolled migration threatens to exacerbate the humanitarian crisis of climate refugees.[224] In 2014, Kiribati had purchased 20 square kilometers of land (about 2.5% of Kiribati's current area) on the Fijian island of Vanua Levu to relocate its population there once their own islands are lost to the sea.[225]

While Fiji is also impacted by sea level rise,[226] it is in a comparatively safer position, and its residents continue to rely on local adaptation like moving further inland and increasing sediment supply to combat erosion instead of relocating entirely.[223] Fiji has also issued a green bond of $50 million to invest in green initiatives and use the proceeds to fund adaptation efforts, and it is restoring coral reefs and mangroves to protect itself flooding and erosion as a more cost-efficient alternative to building sea walls, with the nations of Palau and Tonga adopting similar efforts.[223][227] At the same time, even when an island is not threatened with complete disappearance due to flooding, tourism and local economies may end up devastated. For instance, a sea level rise of 1.0 m (3 ft 3 in) would cause partial or complete inundation of 29% of coastal resorts in the Caribbean, while a further 4960% of coastal resorts would be at risk from resulting coastal erosion.[228]

Adaptation

Oosterscheldekering, the largest barrier of the Dutch Delta Works.

Cutting greenhouse gas emissions can slow and stabilize the rate of sea level rise after 2050, greatly reducing its costs and damages, but cannot stop it outright. Thus, climate change adaptation to sea level rise is inevitable.[229]:3–127 The most straightforward approach is to first cease development in vulnerable areas and ultimately move the people and infrastructure away from them. Such retreat from sea level rise often results in the loss of livelihoods, and the displacement of newly impoverished people could burden their new homes and accelerate social tensions.[230]

It is possible to avoid or at least delay the retreat from sea level rise with enhanced protections like dams, levees or improved natural defenses,[20] or through accommodation like building standards updated to reduce damage from floods, addition of storm water valves to address more frequent and severe flooding at high tide,[231] or cultivating crops more tolerant of saltwater mixing into the soil, even at an increased cost.[161][20][232] These options can be further divided into hard and soft adaptation. The former generally involves large-scale changes to human societies and ecological systems, often through the construction of capital-intensive infrastructure. Soft adaptation involves strengthening natural defenses and local community adaptation, usually with simple, modular and locally owned technology. The two types of adaptation might be complementary or mutually exclusive.[232][233] Adaptation options often require significant investment, but the costs of doing nothing are far greater. For instance, effective adaptation measures are predicted to reduce future annual costs of flooding in 136 of the world's largest coastal cities from $1 trillion by 2050 if no adaptation was done, to a little over $60 billion annually, while costing $50 billion per year.[234][235] However, it has been suggested that in the case of very high sea level rise, retreat away from the coast would have a lower impact on the GDP of India and Southeast Asia then attempting to protect every coastline.[236]

Planning for the future sea level rise used in the United Kingdom.[198]

To be successful, adaptation needs to anticipate sea level rise well ahead of time. As of 2023, the global state of adaptation planning is mixed. A survey of 253 planners from 49 countries found that while 98% are aware of sea level rise projections, 26% have not yet formally integrated them into their policy documents. Only around a third of respondents from Asian and South American countries have done so, compared to 50% in Africa, and >75% in Europe, Australasia and North America. 56% of all surveyed planners have structured plans which account for 2050 and 2100 sea level rise, but 53% only plan using a single projection, rather than a range of two or three projections. Just 14% plan using four projections, including that of the "extreme" or "high-end" sea level rise.[237] Another study found that while >75% of regional sea level rise assessments from the West and Northeastern United States included at least three estimates (usually RCP2.6, RCP4.5 and RCP8.5), and sometimes included extreme scenarios, 88% of projections from the American South had only a single estimate. Similarly, no assessment from the South went beyond 2100, while 14 assessments from the West went up to 2150, and three from the Northeast went to 2200. 56% of all localities were also found to underestimate the upper end of sea level rise relative to IPCC Sixth Assessment Report.[238]

See also

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