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The degradation of trees at the edges of tropical forests is more widespread than previously thought, according to new research.

The study, published in Nature, explains that trees near deforested or degraded areas of the forest are more vulnerable to drought, as well as to human activity such as logging. These “edge effects” are measurable up to 1.5km into the forest, the authors find.

This is an “amazing result”, a study author tells Carbon Brief, because previous studies detected these effects only within the first 120 metres of the forest edge. The new figure indicates that 18% of the remaining tropical moist forests are impacted by edge effects – an area more than 200% larger than previously estimated.

Experts not involved in the study tell Carbon Brief that quantifying tropical forest degradation is “frustratingly elusive”. And while some praise the methods used in the paper, others advise caution when interpreting the conclusions.

Two Brazilian scientists also tell Carbon Brief that the study overlooks important work from institutions in the global south who are also working on this problem. They advise that scientists from local groups should be invited to contribute to research in this area.

Forest height

Tropical forests account for around 45% of forest cover globally. These forests are well-known for their high biodiversity and the crucial ecosystem services that they provide. They also hold around one-quarter of all land-based carbon. 

The new study assesses how deforestation and degradation affect “moist tropical forests” – tropical forests in the equatorial belt with a fairly consistent annual temperature and high levels of rainfall. Tropical dry forests and deciduous forests are not included in the analysis.

Research shows that around 17% of tropical moist forests disappeared over 1990-2021, largely due to human activity such as logging and fires. Of the 1,071m hectares that remained globally in 2019, around 10% were degraded, the new study says. This means that they suffered human-induced “disturbances” that led to a partial loss of their tree cover or function.

Furthermore, trees at the edges of tropical forests have higher mortality rates than trees in the centre, because they are more exposed to disturbances such as fire and drought. When intact forest landscapes become fragmented – for example, due to logging, fire, drought or the construction of roads into the forest – these “edge effects” can lead to further forest degradation.

The authors use data collected by the Global Ecosystem Dynamics Investigation (GEDI) instrument on the International Space Station to assess the forest structure – such as canopy height and aboveground biomass – over the past four years. 

To measure canopy height, the authors calculate the “RH98” value – the height of the top of the canopy or the nearest tallest vegetation in the area. This is an important measure of forest health and maturity. Aboveground biomass measures the aboveground woody biomass per unit area and is also a good measure of forest health.

They combine this with data from the Tropical Moist Forest dataset, which uses Landsat satellite imagery to show how tropical moist forests have changed over 1990-2022.

The plot below shows the canopy height for different types of moist tropical forests. The rows show intact forests at least 3km from a forest edge (top row), degraded forests (second row), the edges of forests (third row) and forest regrowth (bottom row), as shown in the maps below.

Darker blues indicate taller forest canopies. The map shows where the forests are located, and the bar charts on the right hand side show the overall distribution of different tree heights.

Canopy height for moist tropical forests for intact forests (top row) degraded forests (second row), the edges of forests (third row) and forest regrowth (bottom row), as shown in the maps below.
Canopy height for moist tropical forests for intact forests (top row) degraded forests (second row), the edges of forests (third row) and forest regrowth (bottom row), as shown in the maps below. Dark blue indicates a taller area of the forest and light blue indicates a shorter area. The map shows the distribution of trees and the bar charts on the right-hand side show the frequency. Source: Bourgoin et al (2024)

The tallest intact moist tropical forests are found in south-east Asia, where the average canopy height is 34m, the study finds. West and central Africa and Central and South America have average forest heights of 29m. This is because intact tropical forests in Asia, which are typically dominated by “hardwood wind-dispersed species”, are typically taller, the authors say.

The map also shows that degraded forests, forest edges and areas of forest growth have a greater proportion of shorter trees on average.

The forest edge

The study investigates two different types of forest edge effects, exploring how areas of deforested and degraded land impact nearby trees.

Dr Lilian Blanc is an author on the study and researcher at the French Agricultural Research Centre for International Development. He tells Carbon Brief that the effect of nearby degraded land “was not considered in previous studies”.

The graphs below show how areas of deforested land affect tree canopy height. The charts at the top show the average distribution of canopy heights of undisturbed forests in the Americas, Africa and Asia. The line colours indicate the distance of those trees from the forest edge, with yellow indicating a short distance and blue indicating a large distance.

The bottom map shows how far into the forest edge effects are present, by measuring the distance from the forest edge at which the height of the forest reaches 95% of the height of the intact, undisturbed forest. 

Average distribution of canopy heights of undisturbed forests at different distances from the forest edge (top) in the Americas, Africa and Asia, and the distance at which the forest height drops to 95% of the height of the intact forest (bottom).
Average distribution of canopy heights of undisturbed forests at different distances from the forest edge (top) in the Americas, Africa and Asia, and the distance at which the forest height drops to 95% of the height of the intact forest (bottom). Yellow indicates a short distance to the forest edge, and blue indicates a high distance. Source: Bourgoin et al (2024)

The authors find the greatest edge effects from deforestation along the “forestation fronts of the Amazon”, in Borneo and Sumatra coasts marked by high fragmentation levels, and on the borders of the Congo basin.

They also record a decrease in canopy height up to 350, 400 and 1,500 metres from the deforested edge in the Americas, Africa and Asia, respectively.

The authors find that within 120 metres of trees that have been degraded due to logging and burning, the average canopy height in undisturbed forests is 15% and 22% lower, respectively.

The authors also investigate how quickly the forest can recover from logging and fires, concluding that while there is “fast regrowth of pioneer and understory species”, there is “no significant recovery in canopy height in the 30 years following the creation of a forest edge”.

Forest degradation can also increase the likelihood of deforestation, the authors say. They warn that forest height and distance to the edge of the forest are “strong predictors of deforestation”, as forest fragmentation makes the interior of the forest more accessible to loggers.

It adds that there has been selective logging 500 metres from the forest edge in Africa and the Americas, and even deeper in Asia.

Agriculture and road expansion trigger a 20-30% reduction in canopy height and biomass at the forest edge, with “persistent effects” measurable up to 1.5km inside the forest, the authors find. Blanc tells Carbon Brief that this is “an amazing result” as previous studies only looked for edge effects up to 120 metres from the forest edge.

The authors also calculated the edge effect using total above ground woody biomass, instead of canopy height. Using this metric, the authors conclude that the total area of forest with this edge effect is 18% of total global forest area in 2022 – an area more than 200% larger than previously estimated.

Prof Simon Lewis – a professor of global change science at University College London’s department of geography – tells Carbon Brief that this is a “striking new result”. 

It implies that “the negative impacts on remaining forest from the creation of forest edges are much more extensive than has been commonly documented”. It also means that “forest protection of large blocks of forest is going to be more important than we previously thought”, he says.

Overall, the study is “an important step forward in monitoring forest disturbance, which is a very tough problem”, Lewis says. However, he adds that “care is needed” when looking at some of the observational data, saying that he “trust[s] the broad patterns of biomass loss following logging, edge creation and fires, but not the specific biomass loss values from these disturbances”.

Dr Peter Potapov – a researcher in the department of geographical sciences at the University of Maryland, whose work was cited extensively in the new study – says “the conclusion that edge effects are degrading 18% of the remaining humid tropical forest is an overstatement”.

He says that forest degradation depends on other factors, such as land-use regulations, and argues that “the assumption that all forests 1.5km away from the edges are degraded may undermine ongoing conservation efforts.

Expert response

These comments reflect the mixed response that the new study has received.

Prof Matthew Hansen – a remote sensing scientist at the University of Maryland’s department of geography – tells Carbon Brief that forest degradation is “a frustratingly elusive dynamic to quantify”. However, he praises the study for being “very clear and ambitious”. 

Potapov, who has published research with Hansen, tells Carbon Brief that the results broadly confirm existing findings, but warns that there are some “major limitations” with the study.

For example, he says the method does not include a “matching technique” to separate the effect of human management on tree height from the natural factors such as elevation, soil quality and floods. He also warns that the observations “failed to correctly map anthropogenic disturbances in humid tropical forests”, adding:

“The authors greatly underestimate selective logging in Gabon, while the natural non-fire disturbances like river meandering and windfalls in South America were probably treated as human-caused degradation.”

Dr Flávia de Souza Mendes, a programme manager in forest and land use at satellite imagery firm Planet Labs, says the study is “well written”. However, she laments that “there are several local groups from the global south that have been studying this topic and are not part of this study”. She suggests that scientists carrying out similar studies should “invite more local researchers to take part”.

She also tells Carbon Brief that this paper “did not take into account studies carried out by local researchers on the relationship between degradation and deforestation”.

For example, she highlights a report by Brazilian researchers which finds that, in some regions of the Amazon, 86% of degraded areas were not subsequently cleared in the following decades. This is not in line with the findings of the new study, where degradation “has a crucial role in predicting future deforestation”, she says.

Prof Celso Silva-Junior – a research scientist in amazon ecology and remote sensing at Brazil’s Universidade Federal do Maranhão – tells Carbon Brief that the study “reproduces the findings of our research group, which has been investigating large-scale forest edge effects, using remote sensing technologies, since 2016”.

He says that the paper’s findings concerning biomass loss beyond 120 metres from the forest edge are “critical”. However, he emphasises the importance of the “local knowledge of tropical scientists” who are “deeply involved in the establishment of the conceptual framework for treating this relevant problem”.

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Fossil fuel expansion threatens COP31 hosts’ credibility, experts warn

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Türkiye and Australia risk losing their credibility as hosts of this year’s COP31 UN climate summit if they keep betting on fossil fuels at home, climate policy experts have warned. 

As governments are expected to continue fraught talks over how to advance the global transition away from oil, coal and gas in Antalya this November, both of the co-host countries are pursuing fossil fuel expansion at home, without a national timeline to phase out their use.

Türkiye has accelerated its rollout of wind and solar energy in recent years. But that progress has yet to make a dent in the country’s dependence on fossil fuels for power, as demand growth has outpaced the renewables build-out, new analysis by Climate Action Tracker (CAT) has found.

The share of electricity generated by burning coal and fossil gas – 56% in 2025 – has barely changed since 2019, and total fossil fuel use in the power sector, and the emissions it produces, are still rising, according to the report released on Friday.

The Turkish government has also signalled that fossil fuels will remain a central component of its energy mix and has outlined plans to expand the country’s burgeoning domestic gas production in the Black Sea.

‘Need to demonstrate seriousness’

Australia, which will chair the Antalya negotiations, relies on fossil fuels for over 60% of its electricity, with coal alone still supplying 45%. According to experts, it lacks an ambitious plan to shift away from fossil fuels at home, relying heavily on carbon offsetting to reach its climate targets.

Australia is also the world’s third-largest fossil fuel exporter and has plans to expand its coal and gas production, which is backed by significant government subsidies. It recently upset climate groups by approving an extension of the Saraji open-cut coal mine in Queensland.  

Türkiye says it has “final decision” at COP31 despite Australia running negotiations

Jennifer Morgan, a senior fellow with the Fletcher School of Law and Diplomacy at Tufts University and former climate envoy for Germany, said Türkiye and Australia need to demonstrate their seriousness about their COP presidency roles by leading by example on the energy transition.

“They have made progress in renewable energy,” she told reporters this week. “But I think their credibility – and their ability to therefore bring momentum and good outcomes to the COP – will depend on their taking further action at home.” 

Türkiye’s electrification homework

The co-hosts’ fossil fuel policies are being scrutinised in the run-up to the annual UN climate summit, with much riding on the signal climate diplomacy sends on the energy transition.

Türkiye has so far stopped short of putting any overt political capital behind the fossil fuel transition itself. It has instead been rallying support for a new global electrification target of 35% by 2035, seen as the centrepiece of this year’s non-negotiated Action Agenda put forward by Ankara.

Electrification emerges as COP31 priority

COP31 president Murat Kurum said last week the push to electrify economies – through measures like electric vehicles and heat pumps – will “automatically” lead to a reduction in the use of fossil fuels.

Türkiye’s own energy plan projects the country’s electrification rate would fall short on the global target and only hit 25% by 2035, according to the CAT report, which called for a “substantial step-change” in electrification policies and the deployment of more renewable power and grid infrastructure. 

Coal still dominant

CAT’s analysts also warned that, without a parallel phase-out of fossil fuels, rising electricity demand risks being met in part by coal and gas, failing to deliver the emissions reductions the electrification target is meant to achieve. 

Türkiye has had some success in its clean energy build-out: the share of electricity generation from wind and solar rose to 22% in 2025, up from 12% in 2020, according to the CAT report.

But coal’s role in Türkiye’s electricity mix has also grown, in both its share and absolute terms, over the past decade. And while reliance on fossil gas has declined overall, it still plays an important role in Ankara’s energy policy, which is pushing to boost domestic gas production in the Black Sea.

Pilot boats assist the Osman Gazi as it navigates the Bosphorus on its way to the Black Sea on May 29, 2025 in Istanbul, Turkey. The platform will dock at the Filyos Port in the Black Sea and will stay for a 20 year mission and will provide double the natural gas intake of Turkey to 20 million cubic meters per day. (Photo by Chris McGrath/Getty Images)

Pilot boats assist the Osman Gazi as it navigates the Bosphorus on its way to the Black Sea on May 29, 2025 in Istanbul, Turkey. The platform will dock at the Filyos Port in the Black Sea and will stay for a 20 year mission and will provide double the natural gas intake of Turkey to 20 million cubic meters per day. (Photo by Chris McGrath/Getty Images)

Dr Niklas Höhne from the NewClimate Institute said the government could demonstrate leadership as COP31 president by building on its recent successes in increasing its renewable energy capacity and announcing targets and plans to phase out coal and gas ahead of the summit.

According to CAT, Türkiye should phase out coal by 2040 and fossil gas by 2045 at the latest to align its power sector with global efforts to limit the rise in global temperatures to 1.5C above preindustrial times. 

Türkiye quiet on fossil fuel roadmap

Ümit Şahin, coordinator of climate change studies at the Istanbul Policy Center (IPM), said Türkiye’s strategy is to approach the fossil fuel debate exclusively from the “end-use point of view”.

“I don’t expect any push from the Turkish presidency to the producer countries in terms of fossil fuel production,” he told reporters.

Neither does Şahin believe the Turkish presidency will throw its political weight behind another big-ticket item for COP31: a new global roadmap to transition away from fossil fuels. 

Brazil took on the responsibility to voluntarily draft this document outside of the formal negotiations as a way to break the deadlock at last year’s UN summit in Belém when governments clashed over whether to develop one. 

The outgoing COP30 presidency will deliver the roadmap in early November – but it will be up to Türkiye and Australia to guide countries towards a decision on how the blueprint will be taken forward, either inside or outside the negotiations.

Leadership needed

Australia’s Chris Bowen, COP31’s president of negotiations, promised to lobby producing countries to deliver a “meaningful step forward” on the fossil fuel transition in an interview with The Guardian earlier this year. But he has been quiet on the role Australia sees for the fossil fuel transition roadmap. 

Natalie Jones, senior policy advisor at the International Institute for Sustainable Development (IISD), said the COP31 co-presidents “must provide clear leadership” on this process.

“This roadmap cannot be left in a dusty drawer,” she told journalists. “Rather, it must be translated into action, with all countries identifying what elements they can adopt or develop in their own national roadmap.”

    Like Türkiye, Australia has yet to produce a national blueprint for winding down coal, gas and oil. Rather than moving toward a phase-out, state and federal governments have kept expanding fossil fuel licensing over the past year, according to a new analysis published this month by Climate Analytics.

    Under existing policy, both coal and gas are on track to remain in Australia’s power system as late as 2050 – a trajectory the report defines as incompatible with the 1.5C limit the country says it’s committed to. 

    No binding end dates for the Netherlands

    Analysts are watching out for national transition roadmaps as a bellwether for governments that claim to be leaders in the global shift away from fossil fuels.

    The climate and environment ministers of Colombia and the Netherlands, which are co-hosting the Santa Marta conference, embrace on the podium during the high-level segment in Santa Marta, Colombia, April 28, 2026 (Photo: Colombia Ministry of Environment and Sustainable Development)

    The climate and environment ministers of Colombia and the Netherlands, which are co-hosting the Santa Marta conference, embrace on the podium during the high-level segment in Santa Marta, Colombia, April 28, 2026 (Photo: Colombia Ministry of Environment and Sustainable Development)

    The Netherlands, which co-hosted the first fossil fuel transition conference in Santa Marta this year, published its own domestic roadmap earlier this week. The document followed through on a pledge that “leadership on transitioning away from fossil fuels must be backed by concrete action, not just ambitious words”, said a spokesperson for Stientje van Veldhoven, the Dutch minister for climate policy.

    But experts criticised the plan for failing to set a binding end date for the country’s fossil fuel production and use. While targeting a rapid increase in renewables capacity, the Dutch government only commits to phasing out oil, gas and coal “in the energy and feedstock system to eventually zero, and to minimise fossil use” by 2050. 

    Yvo de Boer, a former Dutch diplomat and executive secretary of the UN climate body, said the Dutch roadmap falls short of what’s needed to give industry the confidence to deploy capital in support of the energy transition with greater predictability. 

    “Ultimately, a roadmap without deadlines is nothing more than a footpath paved with good intentions,” he added, writing on LinkedIn. 

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    How clean energy can boost business for Africa’s food producers

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    Despite millions of dollars in grants and technical help for African businesses to power farming and other food production activities with renewable energy, most efforts remain stuck at the early stages because they struggle to find the investors, markets and expertise they need to grow.

    This was the message from a coalition of global institutions working on energy, water and agriculture at this month’s Africa Food Systems Forum in Kigali, Rwanda.

    “Energy, agriculture, water and nutrition actors rarely design solutions together,” the Agri-Energy Coalition said in a Call to Action on powering food systems with clean energy.

    Using more renewables – especially solar power – to drive food systems would reduce food losses, ensure year-round availability and affordability of healthy foods, and improve productivity, income and resilience among farmers, food processors and other small enterprises, the coalition added.

    In an interview with Climate Home News at the forum, Olamide Niyi-Afuye, CEO of the Africa Minigrid Developers Association (AMDA) – a body representing private-sector developers of small-scale, off-grid electricity systems across the continent – said its members are starting to recognise this interdependence and are increasingly considering businesses that combine energy with agricultural activities.

      This, Niyi-Afuye added, could lead to greater supply and use of clean power for key processes like irrigation, food processing and storage, creating new sources of revenue for both sectors.

      CHN: Conversations at the Africa Food Systems Forum highlighted how organisations working in energy and agriculture often operate in silos. What has hampered their collaboration, and how has that affected Africa’s economic development?

      A: Most mini-grid companies in Africa were primarily incentivised to achieve connections. If you look at some ongoing projects, you see a cost-per-connection model [of revenue]. When a subsidy is tied to achieving a connection, regardless of whether it is a productive connection, you might not notice the problem until five years down the line, when you realise the cash flows are not what you projected.

      Despite African walkout, fractious land COP ends without drought deal

      So now we’re in a “come-to-Jesus moment” as an industry, where we’re righting the wrongs and adjusting our business models to make sure companies do not go bust and there is some level of sustainability over the long term.

      The saying is not wrong that we’ve been working in our own silos because we’ve focused on the smaller things instead of the helicopter view. There needs to be cross-pollination [between the energy and agriculture sectors] because, if we are thinking about industrialisation, energy is a key driver of industrialisation. We will not achieve that if we’re not in the room and part of those conversations.

      CHN: Productive use of energy is intended to ensure electricity access goes beyond lighting homes to improving livelihoods, creating jobs and powering equipment. But what happens when farmers cannot afford the equipment they need to do that? How can energy, agriculture and equipment players work together to make the transition more accessible?

      A: That’s why we’re having conversations with companies set up to de-risk the agriculture sector. By leveraging that connection, we’re able to aggregate potential energy needs and develop instruments that make equipment more affordable through bulk procurement.

      We can have arrangements that make it easier for farmers and food producers to lease equipment and eventually own it over a period. There’s no real pressure to recover the capital very quickly because you’re looking at scale.

      Rice farmer Danjuma Okuwa adjusts his newly installed electric rice milling machine at his compound in Rukubi, Nasarawa, Nigeria, September 27, 2022. (Thomson Reuters Foundation/Afolabi Sotunde)

      Rice farmer Danjuma Okuwa adjusts his newly installed electric rice milling machine at his compound in Rukubi, Nasarawa, Nigeria, September 27, 2022. (Thomson Reuters Foundation/Afolabi Sotunde)

      There is a whole lot across the agricultural value chain that needs energy, from farming and harvesting to food processing and value-addition. We need to understand the energy needs across the value chain and bring our members in to provide solutions.

      Developers do not necessarily need to provide every productive-use solution themselves. They can partner with equipment suppliers, financiers, agribusinesses and other service providers to enable customers to use electricity productively. The objective is simple: do not just electrify communities; enable economic activity that uses that electricity.

      CHN: When Africa’s industrialisation is discussed, you hear things like renewables cannot provide enough baseload, while some food processors are sceptical about switching to renewable energy because of these concerns about reliability. What is your response?

      A: It’s not a controversial statement to say that a typical baseload is usually from the grid, and it’s usually from multiple sources including renewable energy. For large-scale operations, we can look at blending multiple sources of energy. But how do we solve the problem of a mid-sized farmer? We can solve it with a mini-grid using renewable energy.

      Comment: Every country needs a model to help optimise its energy transition

      If you go to a small farmer in a rural area, they don’t care about what source of energy they’re getting. They just want something that can help them get from A to B. If you look at the direct energy needs of farmers and food processors, I’m sure 90 percent of their consumption can be solved by renewable energy. Let’s start with that problem first. Then, as they scale, they might need to ramp up, and we can start talking about a bigger baseload.

      CHN: How much agricultural value is lost because farmers and food businesses lack reliable, affordable electricity?

      A: If you look at, for example, the fact that we need to maybe plant tomatoes or strawberries in Jos before it gets to Lagos [Nigeria], which most likely is by road, I can assure you that a good chunk, if not stored properly, would be bad by then. So the fact that we do not have energy is in itself a lost opportunity to maximise the potential of the agriculture sector. So until we’ve solved the energy problem, we will not salvage waste – and for me that is a lost opportunity.

      CHN: AGRA, an institution focused on scaling agricultural innovations to help smallholder farmers, estimates a massive shortfall between current investments in the continent’s food systems and what is actually needed to build a resilient, profitable agricultural economy – to the tune of $180 billion per year. Can integrating energy into food systems help bridge that gap?

      A: Yes – if energy can help unlock the potential to earn more money, investors will follow the money. Investments go where there is certainty, and until there is certainty around cash flow and revenue, investment will be limited.

      My vision is to see more Power Purchase Agreements (PPAs) being signed between energy players and the agriculture sector. We can start by getting people into the room, understanding their pain points, crafting a framework and documentation that works for both parties, and then seeing deals happen.

      This interview was shortened and edited for clarity.

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      Climate Change

      Human security relies on adapting to the world’s new climate reality

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      Cristina Rumbaitis del Rio is a senior advisor on adaptation and resilience with the United Nations Foundation and Mattias Söderberg is global climate lead at Danish NGO DanChurchAid.

      Recent extreme events – from wildfires and heatwaves in Europe to flash flooding following a glacier collapse in Nepal – have shocked and devastated communities, bringing years of warnings about such climate impacts to the doorstep of communities around the world.

      One thing is certain: the new climate reality is here – and the adaptation strategies designed for yesterday’s world are no longer sufficient.

      Attribution science has since shown that the hotter and more frequent heatwaves we’re experiencing around the world would have been virtually impossible without today’s high concentrations of greenhouse gases in the atmosphere. Climate shocks are now so severe that they reverberate through supply chains, food and water systems, financial markets and the movement of people.

        They must be a catalyst for a new way of thinking about adaptation and resilience, and how we finance solutions that work. A failure to invest in adaptation in one region can create costs far beyond it, which is why the concept of shared resilience is critical for leaders to grasp.

        Investment not charity

        At the UN General Assembly (UNGA 81) this month, leaders have an opportunity to translate today’s urgency into concrete commitments on adaptation and loss and damage finance ahead of COP31.

        Those commitments are needed to underpin global stability, shared prosperity and human security. Governments should use this moment to show what a new response looks like: finance that reaches communities faster, supports locally grounded solutions, strengthens national systems, and helps countries prepare before the next shock arrives.

        If we want sustained economic growth, food and water security, and resilient and prosperous societies across every region, adaptation must be at the heart of today’s development and security agenda. It cannot be just a future planning consideration or a narrow issue for climate ministries. Adaptation is now everyone’s business – and it must be financed fast and fair.

        UN Secretary-General António Guterres has repeatedly framed climate finance as an investment rather than charity, warning that “a world in climate chaos cannot be a world at peace” and describing human security as freedom from the chronic and sudden disruptions that climate change multiplies.

        What’s more, adaptation delivers a real return-on-investment, with researchers estimating that every dollar invested produces $10 in benefits, saving lives, protecting livelihoods, and reducing the costs of future disasters.

        Hitting adaptation limits

        The urgency to scale adaptation systematically is growing. The newly released “Limiting Overshoot” report from the UN Environment Programme (UNEP) confirms what scientists have long warned: exceeding global warming of 1.5C is now unavoidable under current policies. Yet, how high temperatures rise – and how long the world remains above the 1.5C threshold – will determine whether communities, economies and entire ecosystems can keep pace.

        There are limits to adaptation. When we breach those limits, lives and livelihoods are lost, and people and ecosystems suffer greatly. We cannot simply build yesterday’s infrastructure a little stronger and assume it will be enough.

        Nepal flood destruction shows “limits to adaptation”, scientists say

        We need to fundamentally change the systems that determine how societies anticipate, absorb and recover from both immediate and evolving non-linear climate shocks. This includes transforming physical systems, such as infrastructure, and the governance systems that affect where and how we live to how we maintain our health and wellbeing.

        Finance today is nowhere near the scale of the challenge.

        The UNEP “Adaptation Gap Report 2025” estimates the shortfall in adaptation finance in developing countries at $284 billion–$339 billion a year – roughly 12 to 14 times current international public flows of around $26 billion. That gap is a development, economic and human security problem, especially for the most vulnerable populations who have contributed the least to causing the climate crisis.

        Building resilience into financial systems

        There are already signs of what a more systemic adaptation response could look like. Communities around the world are delivering practical solutions at local level, even as adaptation finance remains notoriously, and appallingly, difficult to access. Cyclone-resistant homes, local forecasting capacities, drought-resistant crops, heat insurance for pregnant informal workers and mangrove restoration are rooted in local knowledge and lived experience, while delivering benefits far beyond the communities where they originate from.

        But local innovation alone is not enough; the systems around it need to be resilient too.

        Jamaica offers one example. The country has built a multi-layered disaster-risk financing framework, including a catastrophe bond and contingency funds, through sustained fiscal discipline and proactive investment. Its debt-to-GDP ratio fell from around 147% in 2012 to around 62% in 202-25. That groundwork matters when disaster strikes.

        Hurricane Melissa’s destruction shows need for climate resilience push

        Following Hurricane Melissa, Jamaica was able to secure billions of dollars in reconstruction financing from multilateral banks – finance that might otherwise have been much harder to access. The lesson is clear: resilience can be built into the financial architecture of a country before a crisis arrives. That is the shift we now need to make at scale.

        The foundations already exist – in Kingston’s fiscal reforms, in early-warning systems from the Sahel to the Pacific, and in every community that adapted before disaster struck. What is still missing is the political will, and the finance, to take what works and put it to work everywhere, at the speed our world’s new climate reality demands.

        To hear more on this issue from high-level officials and experts, sign up for this event during Climate Week NYC, at 8am EDT on September 24 (in person or online), moderated by Climate Home News Editor Megan Rowling: Adapting to the New Climate Reality: Why Accelerating Impacts Demand New Responses.

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