Coastal flooding could bring $500bn of annual damages to the Asia-Pacific by the year 2100, if countries do not adapt to rising sea levels.
This is according to new research, published in the journal Scientific Reports, which assesses how coastal flooding is impacting the Asia-Pacific region – and models how the damages could worsen as sea level rises over the 21st century.
The paper finds that coastal flooding is already driving $26.8bn of damage every year across 29 countries in Asia and the Pacific, equivalent to 0.1% of the region’s GDP.
It projects that, under current policies, annual coastal flood damages in the region could rise to $518bn by 2100 – but this could drop to $338bn if warming is capped at 1.5C.
Small island states face the greatest risks from coastal flooding and will continue to bear the brunt of the damage as the planet continues to warm, according to the research.
For example, it finds that Tuvalu will face annual coastal flood damage equivalent to 38% of its GDP by the end of the century.
Meanwhile, small island states such as Kiribati, the Maldives, Micronesia and Tuvalu will permanently lose around 10% of their total land area.
The study’s lead author says the research shows how “rising seas” create “existential” and “economic” risks for low-lying islands in the Asia-Pacific.
He tells Carbon Brief that the paper highlights a “sharp inequality”, as developing nations with little historical responsibility for sea level rise face the brunt of its impacts.
Coastal damage
More than one billion people – about 15% of the world’s population – currently live within 10km of a coast.
Asia is home to some of the largest cities in the world, many of which are located near the sea, such as Mumbai, Tokyo, and Shanghai. The continent is home to 60% of the world’s coastal population.
However, there are hazards to living near the water.
Coastal flooding is caused by a combination of gradually rising sea levels and “episodic extreme sea levels”, such as high tides and storm surges, the study explains.
To assess these two factors, the study combines components including an ocean model and tide-height data.
The authors model flooding in all coastal Pacific and Asian countries that are listed as “developing member countries” by the Asian Development Bank. These 29 countries include Bangladesh, the Philippines and Tuvalu.
They calculate the economic damage caused by flooding, by combining their flood model with data on land use and “asset values” across the residential, commercial, industrial, infrastructure and agricultural sectors.
The authors assume when land floods permanently, the “assets” are completely lost. For areas that only flood periodically, the authors use a model linking flood depth to a percentage of land damaged to calculate the economic consequences.
They find that coastal flooding currently drives $27bn of damage every year in the Asia-Pacific.
China and Indonesia bear the greatest damage, each losing more than $6bn every year. The study authors say this is because both countries have “extensive coastlines, large populations in flood-prone areas and critical economic infrastructure concentrated near the coast”.
However, the study finds that small islands face the greatest economic damage as a percentage of their GDP.
The study shows that the five most-severely affected countries are small island states. Vanuatu tops the ranking, losing 1.5% of its GDP to flooding every year. It is followed by Papua New Guinea and Micronesia.
Dr Michalis Vousdoukas is a researcher in coastal geography at the University of the Aegean in Greece and lead author of the study.
He tells Carbon Brief that even these damage estimates are “conservative” as they do not consider indirect economic losses, such as disruption to business, the loss of critical infrastructure, such as airports, or social impacts, such as migration.
Vousdoukas tells Carbon Brief that the study “highlights a sharp inequality between responsibility and impact”, explaining that the “countries that contributed the least to global emissions, particularly atoll nations, face the highest relative damages”.
Island nations in the Asia-Pacific region made of atolls – ring-shaped coral reefs or islands – include Kiribati, the Marshall Islands and Tuvalu.
Exposure
The authors also calculate population exposure to flooding, by overlaying their flood model with world population data.
Vousdoukas explains that “a person is considered exposed if they live in an area that appears as flooded in our model”.
The paper finds that six million people across the Asia-Pacific are currently at risk of coastal flooding each year, accounting for 0.2% of the region’s total population. The paper says:
“Although this may appear to be a small percentage, it still represents millions of individuals and families whose lives and livelihoods are under constant threat.”
Ranjan Panda is the convenor of the Combat Climate Change Network in India. Panda, who was not involved in the study, tells Carbon Brief that sea level rise is already forcing “millions of people to migrate out in distressed conditions to cities and other countries”.
China and Bangladesh rank the highest, with 2.2 million and 1.5 million people, respectively, exposed to coastal flooding each year.
However, small islands have the greatest percentage of their population exposed to flooding. Vanuatu again tops the table, with 2% of its population facing coastal flooding every year, according to the study. It is followed by Micronesia and the Maldives.
Bangladesh is the highest ranking non-island country, due to its “densely populated and flood-prone delta region”, the study finds.
Rising seas
As the climate warms, coastal flooding is worsening.
Average global sea levels have risen by more than 20cm since 1900, driven mainly by the thermal expansion of the ocean and the melting of glaciers and ice sheets.
Global warming is also “supercharging” hurricanes and typhoons, causing storm surges – the temporary rise in sea level that happens during a storm – to become more intense.
The study uses projections from the IPCC’s sixth assessment report to model sea level rise over the 21st century. These include thermal expansion and meltwater from glaciers and ice sheets, but exclude “low-likelihood, high-impact” events, such as ice-sheet collapse.
The authors assess five future scenarios:
- SSP1-1.9: A very-low emissions reductions pathway that “aligns with” the Paris Agreement’s 1.5C limit
- SSP1-2.6: A “low” emissions pathway achieving net-zero emissions after 2050
- SSP2-4.5: A “moderate” emissions scenario, often described as the trajectory under current climate policies.
- SSP3-7.0: A “high” emissions pathway
- SSP5-8.5: A very-high emissions pathway of “high fossil fuel reliance” throughout the 21st century
They find that, even under the lowest 1.5C warming scenario, countries in the Asia-Pacific will face damages of $338bn due to coastal flooding every year by the end of the century. This accounts for 1.3% of the region’s present-day GDP. (The authors assume no adaptation measures, changes in land use or inflation over the century.)
Under the current policy scenario, annual damage from coastal flooding rises to $518bn by the end of the century.
The chart below shows coastal flood damage as a percentage of annual GDP by the end of the century under the five scenarios for each country. Each horizontal bar shows the damage for one country, with the lowest warming SSP1-1.9 scenario on the left (grey) and highest warming SSP5-8.5 scenario (black) on the right.
The study finds that, by the end of the century, the Pacific island of Tuvalu will face the worst economic consequences from coastal flooding. Even under the 1.5C warming scenario, its annual economic losses due to coastal flooding will reach 38% of its GDP.
The authors also assess the amount of land that will be permanently lost to the sea.
They find that small island states – such as Kiribati, the Maldives, Micronesia and Tuvalu – will experience the highest percentage of their land permanently submerged, each losing around 10% of their total land area.
Two million people currently live in areas of the Asia-Pacific that will be permanently flooded by the end of the century under the 1.5C warming scenario, according to the research.
Finance gap
Countries can reduce the impacts of coastal flooding through adaptation. This can include building flood defenses, making infrastructure more resilient to flooding, or arranging “managed retreat” to move people away from vulnerable areas as the seas encroach.
The study authors model the cost of building defences – such as sea walls, levees, embankments and sand dunes – high enough that the economic damage from coastal flooding over the 21st century does not worsen beyond 2020 levels.
The research highlights that the cost of investing in these defences is substantially lower than the potential economic damages of sea level rise.
The authors estimate that, under a 1.5C warming scenario, building flood defenses to limit flood damage to 2020 levels would cost $9bn in total. However, building these defences would avoid $157bn in damages due to coastal flooding, they find.
Dr Rafael Almar is a researcher at the Laboratory of Space Geophysical and Oceanographic Studies in France and was not involved in the study. He says the study has “significant implications for development banks and financial institutions” as it could help them prioritise investments in “clearly identified hotspots”.
However, he emphasises that building flood defences “is not the only solution”. For example, he argues that “relocation and renaturalisation” – the process of moving people away from the coast and allowing the area to return to its natural state – can make an area “more resilient”.
Panda also warns that physical flood defenses “could actually be triggering further local environmental crises that accelerate the losses and damages faced by people due to sea level rise and flooding impacts”.
Sea walls have been shown to damage wildlife – for example, blocking animals such as turtles from reaching parts of the beach – according to an article in Climate Home News. The piece adds that physical defenses are “inflexible” and “mainly benefit the rich and encourage risky building near the coast”.
Sourcing money for developing countries to adapt to the impacts of climate change is an ongoing talking point at international climate negotiations.
A group of developed nations, including much of Europe, the US and Japan, is obliged under the Paris Agreement to provide international “climate finance” to developing countries. This money can be used for both mitigation – reducing emissions to limit warming – and adaptation.
In 2023, developed nations provided $26bn in international adaptation finance to developing nations, according to a recent UN report. This is roughly the amount that Asia-Pacific countries currently lose every year due to coastal flooding alone.
The post Asia-Pacific faces ‘$500bn-a-year’ hit from rising seas if current policies continue appeared first on Carbon Brief.
Asia-Pacific faces ‘$500bn-a-year’ hit from rising seas if current policies continue
This year’s so-called “super El Niño” is entering into record-breaking territory.
Sea surface temperatures in the tropical Pacific now equal the previous daily record set in 2015 and will likely keep rising in the days ahead.
El Niño is a naturally occurring climate phenomenon in the Pacific that reshapes weather patterns around the world and temporarily boosts global temperatures.
The current El Niño event – which has been underway since June and is expected to last until next year – has been developing faster than any previous event on record.
The strength of an event is tracked using the “Niño 3.4 anomaly”, which measures how much warmer sea surface temperatures in a section of the central Pacific are than average.
As of 19 September, the daily anomaly in the Niño 3.4 region stands at 3.07C, putting it in a statistical tie with the previous record of 3.08C.
Some scientists, using a different baseline for calculating the anomaly, have already called the new record.
Either way, this is remarkable, in part because of how early in the calendar year it is occurring. El Niño typically peaks in the winter months, most commonly in November or December.
Every strong El Niño on record has continued to strengthen after mid-September – and there is every reason to think that this one will as well.
(For more on El Niño, see Carbon Brief’s recent interactive explainer.)
Record territory
El Niño events are typically classed as “weak” when the Niño 3.4 anomaly reaches 0.5C, “moderate” above 1C, “strong” above 1.5C and “very strong” above 2.0C.
For this year’s event, the Niño 3.4 anomaly has now reached 3.07C, which puts it in a statistical tie with the record set on 18 November 2015, set during a “very strong” El Nino event.
The chart below shows how the strength of the current El Niño (red line) is dramatically outpacing both 2015-16 (blue) and another “very strong” event in 1997-98 (light blue).
To analyse the developing El Niño, Carbon Brief followed the convention of the US National Oceanic and Atmospheric Administration’s (NOAA) Oceanic Niño index (ONI).
ONI is calculated by subtracting the latest 30-year average temperature in the Nino 3.4 region from daily sea surface temperatures. This approach allows for the most recent years to be compared against the most recent 30-year period. It removes much of the influence of longer-term, human-driven warming from the index.
(While meteorological organisations typically track changes to ONI on a three-month rolling average basis, Carbon Brief’s analysis looked at how the metric is changing on a daily basis.)
If ONI is calculated using a baseline of 1991-2020 then the current El Niño has already set a new record.
Since the start of June, El Niño’s strength has been greater than any other year. In early September in both 1997 and 2015, anomalies were around 1.9C – more than one degree below where they are this year.
An alternative index
There is another commonly used metric – the relative Oceanic Niño index (RONI) – used to study El Niño.
Introduced by NOAA in 2024, the RONI index adjusts for tropical ocean warming linked to human-caused climate change. To do this, it takes sea surface averages in the Nino 3.4 region and subtracts out temperature anomalies observed across the tropical oceans (between the latitudes of 20 degrees north and south).
This approach may better remove the influence of climate change in this specific region, but can also diminish the apparent strength of strong El Niño events, such as the current one, which extend well outside the Niño 3.4 region.
The chart below shows daily RONI values, which are record setting for this time of year, but remain below an all-time daily record set during the 1982-83 El Niño event.
RONI stood at around 2.5C in mid-September, some 0.7C below the 1982 record.
However, that record was set in late December, at the peak of the event.
The 1982-83, 1997-98 and 2015-16 events added between 0.5C and 1.9C to their RONI values between mid-September and their peaks.
On track to smash monthly and seasonal records
Because daily El Niño values are noisy, scientists typically turn to monthly or seasonal averages to compare El Niño events.
The latest full calendar month for which data is available – August 2026 – had a Niño 3.4 anomaly of around 2.45C. This is higher than the peak of every prior El Niño event on record except 2015-16 – where the anomaly reached 2.75C – and 1877-78, when the anomaly sat at around 2.7C, based on a reconstruction of sea surface temperatures using sparse ship data.
The figure below shows the monthly evolution of the five strongest El Niño events on record alongside 2026, as well the current forecast from 14 seasonal forecast models.
Taken together, the models project a peak monthly anomaly later this year of around 4.1C, with 80% of the 674 individual model runs falling between 3.4C and 4.6C.
Every single model run peaks above the 2015-16 record. The projected margin over that record, some 1.3C, is larger than the entire gap between the strongest and fifth-strongest El Niño of the past 150 years.
Some caution here is warranted, however. No seasonal forecast system has ever been verified against an event of this size, because none has ever occurred. The models also predicted temperatures slightly warmer than observed this summer, with real-world observations for August coming in around 0.3C below forecasts.
However, all strong El Niño events on record have continued to strengthen well into the winter – and the models are in near-unanimous agreement that this one will, too. If the forecast holds, the current event will peak between November and January at a level far beyond any event previously observed in the instrumental record.
El Nino’s effect on global temperatures typically lags rising ocean temperatures in the Pacific by several months, so most of the impact will be felt in 2027 rather than 2026.
Carbon Brief’s most recent “state of the climate” quarterly analysis found 2026 on track to be the warmest or second-warmest year on record. The next update in early October will examine what a record El Niño means for 2027.
The post Analysis: ‘Super El Niño’ reaches ‘remarkable’ all-time record appeared first on Carbon Brief.
Analysis: ‘Super El Niño’ reaches ‘remarkable’ all-time record
Artificial intelligence (AI) is set for a bigger role at this year’s UN climate summit, as Türkiye’s COP31 presidency seeks backing for a new pledge on the technology’s energy use.
In a statement on Monday, the COP31 hosts said they will launch the Antalya Pledge on AI, which they billed as a “political” commitment on how AI is “designed, procured, powered, deployed, measured and managed” in support of climate action.
“We must openly discuss AI’s growing energy consumption and it is time for governments to start setting the terms,” COP31 president Murat Kurum said in an emailed statement. “We expect companies to be transparent about their energy use and to power their operations with clean energy”.
No further details about the pledge have been made available so far, including whether it will include a clean energy commitment or whether governments and companies will be invited to sign on. The COP31 presidency said it would share a draft before the summit opens in Antalya in early November.
UN climate chief Simon Stiell went further in a New York speech on Monday, warning that AI leaders are “on thin ice when it comes to license to operate, and sinking deep underwater when it comes to public support”.
“Energy-guzzling artificial intelligence is driving up planet-heating pollution from coal, oil and gas, while ratcheting up energy costs for households and businesses,” he said, adding that data centre projects are being put on hold due to public opposition from New York to Texas.
Growing energy use and emissions
Concerns about the environmental impacts of AI infrastructure and its impact on rising electricity prices have led to a growing backlash in some communities, especially in the US.
Big Tech’s breakneck race to develop new AI models and build out the energy-hungry infrastructure supporting them has stoked fears over the technology’s growing climate impact.
Greenhouse gas emissions generated by data centres through their electricity use are set to more than double between 2024 and 2030, according to the International Energy Agency (IEA).
Data centres, which underpin various technologies including AI, are expected to consume more power than all but five countries by the end of the decade.
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As grids struggle to meet soaring electricity demand for AI data-crunching, big tech is under pressure to cover the costs of boosting power supplies – which may be dirty or clean
The AI race is also driving a surge in new fossil gas investment in the United States, where Big Tech giants including Microsoft, OpenAI and Meta have struck up major deals with fossil fuel operators to power their infrastructure.
In China, the other major global AI force, coal provides around 70% of the electricity powering the country’s data centers, according to an IEA report published last year.
More space for AI at COPs?
Despite AI’s rapidly growing relevance for the world’s ability to limit global warming, high-level discussions on the climate impact of the technology have been largely absent at UN climate summits.
While the pledge is still being developed and scarce details have been made public so far, the Antalya initiative, alongside sharper rhetoric from Stiell, suggests that might be changing.
Climate Home News understands that the UN climate change body is encouraging AI companies to be present at COPs as the climate summits set the global direction for energy policy and tech firms now have a major stake in it.
Earlier this year, UN Secretary-General António Guterres launched an initiative aimed at holding AI companies accountable for their environmental impacts and repeated a call for all big AI companies to commit to powering every data centre with renewable energy by 2030.
Align AI with science
Stiell said that tech titans need to start showing why the benefits of AI outweigh its “skyrocketing costs”, by setting credible climate targets, coming clean about their energy use and powering data centres with renewable energy.
AI proponents claim that, despite its growing energy use, the technology’s widespread application would bring net benefits in the fight against climate change by driving massive energy efficiency gains and optimising renewable energy integration. The IEA estimates that existing AI applications could cut emissions by more than data centres add.
Fossil fuel expansion threatens COP31 hosts’ credibility, experts warn
But critics argue that it is wrong to compare theoretical gains with real-world emission growth and any gains are outweighed by the widespread adoption of AI tools by fossil fuel companies to extract planet-heating oil and gas faster and more cheaply.
Stiell said the tech industry needs to “respect science and start aligning with global climate efforts – urgently”.
Alongside the AI pledge, the COP31 presidency has also announced it will launch an ‘AI for Clean Technologies’ Initiative, which will develop a portfolio of AI-enabled clean-technology pilots in priority sectors, including smart energy and green industry.
This programme aims to demonstrate the responsible use of AI in practice, the COP31 presidency promised.
The post COP31 presidency announces AI pledge as UN climate chief says Big Tech ‘on thin ice’ appeared first on Climate Home News.
COP31 presidency announces AI pledge as UN climate chief says Big Tech ‘on thin ice’
Dola Oluteye, PhD, is a senior fellow in energy and transport policy at the UCL Energy Institute and founder of The Professional African Network Advisory Initiative.
At the June 2026 UN Climate Meetings in Bonn, the incoming Turkish COP31 Presidency introduced a headline target for the Action Agenda: raising electricity’s share of global final energy consumption from around 20% today to 35% by 2035.
Backed by the international Electrify Now campaign – also launched in June by the European Commission and governments across five continents, including Ethiopia – the aim is to replace fossil fuels with clean energy by shifting the way we travel and transport goods and commodities, cook and warm our homes and offices, and power our industries.
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On paper, this is a welcome signal. Yet, as world leaders line up behind global goals in the lead-up to COP31, African nations face a fundamental question: whose energy transition are we talking about? For the roughly 600 million people living without electricity on the continent, international climate targets often sound less like a lifeline and more like a conversation happening on another planet.
For developed countries, electrification is largely a replacement exercise – swapping petrol and diesel vehicles for electric ones, and gas boilers for heat pumps powered by existing, stable grids.
But across sub-Saharan Africa, the challenge is vastly different. The region accounts for 85% of the global population without electricity, up from 50% in 2010. Here, electrification is not a technology swap; it is the foundational building block of human dignity, economic sovereignty, energy access and modern development.
Electricity connections must deliver real development
Half of the number of people without electricity access in Africa live in three countries – Nigeria, Ethiopia and the Democratic Republic of Congo – while 900 million other Africans lack clean cooking solutions.
The proposed global electrification goal must not treat a continent with nearly half of its population without electricity the same way it treats mature Western economies.
To regard electrification merely as a tool for decarbonisation misses the core reality of our continent. Africa is not just transitioning an existing energy system; we are building one from the ground up in many places.
If a global electrification target of 35% by 2035 is to mean anything for Africa, it must be rooted in African realities. That begins with acknowledging that expanding power connections alone is insufficient.
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Energy poverty does not end when a power line crosses a village; it ends when electricity is reliable, affordable and powered by clean sources that spur productive economic activities. Connecting households to a micro-grid they cannot pay to use does not deliver development.
Electrification can also help solve the critical issue of super pollutants in countries like Nigeria, notably the production of methane and black carbon, by replacing combustion-based systems with cleaner, electric alternatives.
Breaking from past extractive models
Equally critical is how the electricity is generated. Within some African policy circles, electrification has occasionally been viewed with scepticism – seen as a possible Trojan Horse to justify expensive nuclear projects or to expand long-term fossil gas lock-ins.
We must be clear: expanding electricity demand while increasing reliance on volatile fossil fuels or unviable, high-cost infrastructure is a false solution.
True electrification must be paired directly with the massive development of Africa’s unparalleled renewable energy resources.
Africa holds 60% of the world’s best solar resources, alongside immense hydro, wind and geothermal potential. Tying the global electrification push to renewable energy capacity and local battery storage is the only pathway that protects African economies from international fuel price shocks while keeping our climate commitments intact.
Global climate negotiations such as those ongoing at the International Maritime Organization (IMO) offer another building block for Africa’s green energy future.
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Adopting a shipping carbon price at the IMO this year, through the Net-Zero Framework, would create a climate fund worth $12 billion a year. This finance could be used not only towards the electrification of Africa’s ships and ports, but also for building broader renewable energy production on the continent.
Furthermore, global initiatives must break from past extractive models. Africa cannot remain merely a site for extracting critical minerals – such as lithium, cobalt, and copper – to feed green supply chains elsewhere, only to import expensive finished technologies.
An authentic, inclusive campaign must support the development of local industry, mineral value addition and job creation on the continent.
Africa’s COP31 agenda should centre clean electrification
To achieve this, international campaigns like Electrify Now must deepen their partnership with Global South institutions. Western-centric messaging encouraging people to buy electric vehicles and install heat pumps at home must be paired with calls for robust transmission grids, decentralised mini-grids, industrial energy security and affordable clean cooking.
For this to happen, it would be great to see more African governments, businesses and civil society organisations join the Electrify Now campaign, where they can advocate for the challenges and opportunities on our continent.
Ethiopia is a great example, where a government policy to ban the importation of petrol and diesel cars has led to the country becoming a continental leader in the uptake of electric vehicles. Meanwhile, the Grand Ethiopian Renaissance Dam has seen the cost of electricity come down significantly and accounts for more than half of Ethiopia’s renewable energy generation capacity.
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The road to COP31 offers Africa a pivotal opportunity to place clean electrification at the very centre of its economic and climate agenda.
By taking ownership of this narrative, African leaders can insist that global targets deliver capital, technology sharing and infrastructure investments tailored to local needs.
Electrification is not a luxury or a secondary climate goal. Powered by renewable energy – the African sun and wind – it can be the engine of our green industrial transition. It is important for global climate architecture and Western governments to be aligned with that reality.
The post Why the global electrification agenda misses the point on Africa’s energy crisis appeared first on Climate Home News.
Why the global electrification agenda misses the point on Africa’s energy crisis
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