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For years, fisherman Sami Uddin lived and worked on a small patch of coastal land in southeastern Bangladesh – until the site was earmarked for development including a new cyclone-resistant deep-sea port, funded by Japan in the name of climate change adaptation.

“The development is [meant to help us] all, but the reality is that it takes our homes, professions, and they are forcing us to be evicted from our village,” Uddin, 51, said close to the port site in Matarbari, adding that new fishing restrictions nearby have fuelled local people’s anger.

The deep-sea port – being built next door to a new coal-fired power plant, also financed by Japan – is a centrepiece of Bangladesh’s ambitions to develop a “Singapore-style” economic hub on its climate-vulnerable Bay of Bengal coastline, a low-lying belt of densely populated land, prone to deadly tropical cyclones and flooding.

Funded with a $726-million concessional loan, half of which was counted by Japan as climate adaptation finance, the port marks the biggest single climate adaptation project being funded by a wealthy country in 2023, according to an analysis by Climate Home News of the latest data compiled by the Organisation for Economic Co-operation and Development (OECD).

But like other foreign-funded projects classed as “climate adaptation”, Climate Home’s reporting raises questions about whether the port investment will help climate-vulnerable local communities cope with the effects of more extreme weather and rising seas.

Japan’s development agency said the resilience measures to protect the port are crucial to preventing economic shocks and the disruption of essential services in case of disasters, while some interventions could also keep local people safer when storms hit.

COP30 president warns of ‘dystopian scenario’

Climate adaptation is set to be a key theme at next month’s COP30 UN climate summit in Brazil, and calls are growing for rich nations to increase their support for projects to help developing countries that are bearing the brunt of worsening climate impacts.

COP30 president André Aranha Corrêa do Lago said last week that the UN talks should take concrete steps to help vulnerable people adapt to a warming world and avoid a “dystopian scenario” in which only the rich can afford to protect themselves from climate threats.

But with just a fraction of needs for adaptation funding currently being met, according to the latest UN estimates, climate campaigners told Climate Home News that mega-projects like Matarbari are not the best way to protect the world’s poorest people from climate change.

    They are also sounding the alarm about how a lack of uniform reporting rules and poor transparency in the data give countries free rein over what they label as adaptation finance.

    Some donors “cheat” by focusing more on inflating numbers than on delivering real impact, said John Nordbo, senior climate advisor at NGO CARE Denmark and co-author of the annual “Climate Finance Shadow Report”.

    “They label large projects with little or no adaptation component as ‘climate finance’,” he told Climate Home News. “It’s misleading – and when exposed, it undermines trust in the entire global climate regime.”

    The $363 million provided by Japan for the Matarbari port was counted as adaptation finance under official data used to measure whether donors are meeting their promises on climate finance made at UN talks. It accounted for an estimated 15% of Japan’s total contributions to climate adaptation in 2023 – the latest year for which data is available.

    A man walks on the road with a net as people fish at the shrimp and crab farms that are flooded due to heavy rain, as Cyclone Remal hits the country, in the Shyamnagar area of Satkhira, Bangladesh, May 27, 2024. (Photo: REUTERS/Mohammad Ponir Hossain)

    A man walks on the road with a net as people fish at the shrimp and crab farms that are flooded due to heavy rain, as Cyclone Remal hits the country, in the Shyamnagar area of Satkhira, Bangladesh, May 27, 2024. (Photo: REUTERS/Mohammad Ponir Hossain)

    “No one must be left behind”

    When, at COP26, Japan committed to doubling its assistance for adaptation to $14.8 billion in public and private finance by 2025, its then Prime Minister Fumio Kishida told fellow world leaders “no one must be left behind as we confront the issue of climate change”. He added that investments would focus on disaster risk reduction.

    Japan said the delivery of that pledge was “on track” in its latest assessment report for the UN earlier this year.

    But Climate Home’s analysis of the data from the OECD – the main body tracking global climate finance flows from industrialised nations – found that in 2023 Tokyo channelled at least a third of its bilateral adaptation finance into large-scale infrastructure projects and broad health programmes that lacked clear climate adaptation objectives.

    It counted loans worth hundreds of millions of dollars for the construction of mass rapid transit in Jakarta and the rollout of universal health coverage in Egypt as adaptation finance, for example. It offered no explanation in project documents of how either initiative would strengthen resilience to climate impacts.

    It also reported a $200-million grant to the global vaccine alliance, Gavi, to support its COVID-19 response as having “significant” relevance for climate adaptation. In an assessment of Gavi in 2024, the Multilateral Performance Network described as a “serious challenge” the fact that addressing climate change was not yet a core objective within the alliance’s strategy.

    Md Shamsuddoha, a former climate negotiator for Bangladesh who now leads the Center for Participatory Research and Development, said Japan repackages “pure investment projects” for infrastructure development as climate finance to show it is meeting its commitments made under the UN climate regime.

    “Japan should not do this, because that is no climate finance at all,” Shamsuddoha added.

    Japan’s Ministry of Foreign Affairs and its overseas aid arm, the Japan International Cooperation Agency (JICA), were approached for comment on the adaptation relevance of these projects, but had not responded by the time of publication.

    Roadbuilding and energy projects

    Climate Home’s analysis found Japan was not alone among major donors in labelling funds for large transport and energy infrastructure projects, or broad health programmes, as bilateral climate adaptation finance, which tends to be provided in grant form or as highly concessional lending to the poorest nations.

    France and South Korea have used a similar approach, according to our analysis of the data from the OECD.

    The three countries’ bilateral funding for those projects totalled at least $4 billion in 2023, but South Korea and France do not disclose the exact portion they have counted as climate adaptation finance.

    According to the OECD data, France described loans provided for energy projects in developing countries as having a primary objective of adaptation, without giving a clear explanation of how they would boost climate resilience. They include strengthening electricity grids in Pakistan and Argentina, a hydropower plant in Tanzania and work to develop decarbonisation plans in Uzbekistan.

    South Korea is not part of the group of developed countries under the UN climate regime and is therefore not obliged to provide climate finance to poor nations. But, in recent years, the country – one of the world’s largest economies – has hailed its “significant” support to the Global South for climate adaptation interventions.

    Transport projects made up a significant portion of South Korea’s adaptation spending in developing countries in 2023. It counted the construction of a railway bridge in Bangladesh, a major highway in Vietnam and road networks in Cambodia and the Philippines among its top adaptation projects.

    Hanna Hakko, a senior policy advisor at think-tank E3G, said developing countries have a critical need to build new resilient infrastructure and climate-proof what they already have.

    “However, there is a need for clarity and guardrails around what counts as resilient infrastructure and to ensure impacted communities benefit from these projects and environmental impacts are minimised,” she added.

    The climate ministries of South Korea and France had not responded to Climate Home’s request for clarifications on their adaptation finance at the time of publication.

    Limited transparency in reporting system

    Other donor governments such as Denmark, Switzerland and Finland take a more conservative approach, only counting pure climate adaptation activities or funding donated as grants in their spending.

    But limited transparency in the reporting system makes it difficult to tell how much money overall is directed at efforts that truly help the most vulnerable communities to better cope with the escalating impacts of climate change.

    Countries disclose brief and vague descriptions of the projects, often failing to offer details on their relevance for climate adaptation, Climate Home found.

    Foreign aid cuts put adaptation finance pledge at risk, NGOs warn

    Some European countries, including Germany, France and Italy, did not even identify a specific project or recipient nation for non-concessional funding worth hundreds of millions of dollars that was tagged as adaptation finance.

    Ian Mitchell, a senior policy fellow at the Center for Global Development, said the problem lies with setting international goals to provide a certain amount of finance without a broadly agreed definition of what that finance can consist of.

    “It is a pretty damaging state of affairs because these agreements are reached to motivate other countries to undertake climate action,” he added.

    Focus on plugging adaptation gap

    At the COP26 climate summit in Glasgow four years ago, developed countries committed to doubling adaptation funding for developing nations from 2019 levels to reach at least $40 billion by 2025.

    That promise now looks set to be broken. According to the latest UN Environment Programme Adaptation Gap Report, international public adaptation funding from wealthy governments stood at only $26 billion in 2023 – falling slightly from the previous year.

    UNEP’s report, released on Wednesday, warns that this year’s target “will be missed if current trends continue”.

    Since 2023, widespread cuts to aid budgets amid geopolitical tensions and fiscal pressures have likely put the Glasgow goal further out of reach. Least-developed countries (LDCs), meanwhile, are pushing for a new goal to be set at COP30 to boost adaptation finance to about $100 billion a year by 2030.

    Brazil’s COP presidency also wants to elevate climate adaptation, which has long missed out on political attention and funding directed instead to efforts to cut greenhouse gas emissions.

    The renewed focus on adaptation in Belém could also increase scrutiny of how donor countries are allocating climate finance in countries like Bangladesh, and whose interests they are serving.

    Climate-friendly coal plant?

    Japan’s investments in Matarbari, for example, come as the country seeks to develop its economic ties with Bangladesh and counter China’s growing influence in the region.

    Even the 1,200-megawatt coal-fired power plant, which JICA has financed with loans worth more than $2 billion, was counted by Japan as climate finance. It said the technology installed by Japanese firms made the plant more efficient, leading to a reduction in emissions compared to a conventional station.

    The plant is expected to spew into the atmosphere nearly 7 million tonnes of carbon dioxide a year – equivalent to the total annual emissions generated by a small country like Mauritius.

    As ships needed to deliver coal to fuel the plant, the developers built a port and a navigation channel connecting it to the ocean. Those facilities are now being expanded with the construction of the neighbouring deep-sea commercial port, which Japan agreed to fund in 2023 with a $726-million concessional loan.

    Expected to be completed in 2029 by Japanese companies, the project aims to increase Bangladesh’s ability to handle cargo and spur economic activity in the area.

    Takahiro Okamoto, who oversees the project at JICA’s Bangladesh office, said the inclusion of protections, like breakwaters, retaining walls and raised embankments, will shield the port and its access road from the impact of storm surges and cyclones.

    “By allowing larger, more efficient ships to dock directly, the project reduces the country’s reliance on smaller, vulnerable ports and trans-shipment hubs in other countries, which might be more susceptible to disruptions from climate change and other factors,” Okamoto added.

    Loss of salt and shrimp farms

    Amid the bustle of construction activity, local residents in the area were sceptical about whether the development will make them better prepared for tidal surges or more frequent and severe storms.

    Even if it does, they said the cost to their communities has been too high.

    Over a third of the salt and shrimp farms in the area would be lost as a result of the construction, an impact assessment carried out by JICA found, adding that the mega-project would affect an area inhabited by almost 800,000 people.

    A sign cautioning that entry is prohibited to the area where the deep-sea port is under development and warning that entry without permission “is a legal crime, and if violated, we will take legal action.” (Photo: Tanbirul Miraj Ripon)

    A sign cautioning that entry is prohibited to the area where the deep-sea port is under development and warning that entry without permission “is a legal crime, and if violated, we will take legal action.” (Photo: Tanbirul Miraj Ripon)

    Habibur Rahman, an unemployed 24-year-old man, said the development was not offering stable job opportunities for locals, while the coal power plant was causing growing pollution and damaging fishing activities.

    “The [port] authority did not take a single project to develop our lives,” Rahman said.

    Chittagong Port Authority and the Shipping Ministry did not reply to requests for comment.

    JICA’s Okamoto said contractors are encouraged to employ local residents “as much as possible”, while 500 people have so far been trained under a programme that supports alternative income-generating activities.

    He added that embankments built along the access road to the port to protect it would also serve as evacuation routes in disasters and that further protective measures may be considered as part of a separate plan being worked on by the Bangladesh government.

    In the meantime, rising sea levels and stronger tidal flooding continue to chip away at the coast and swallow homes in the area, local media have reported.

    “In no way [is] this an adaptation or resilience project,” Shamsuddoha said of the Matarbari development, saying it did not represent “resilient livelihoods” that would support coastal communities.

    While developed countries pour their money into headline climate investment projects, the human dimension of adaptation is “completely missing”, he added.

    The post Business-as-usual: Donors pour climate adaptation finance into big infrastructure, neglecting local needs appeared first on Climate Home News.

    Business-as-usual: Donors pour climate adaptation finance into big infrastructure, neglecting local needs

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    Pawa in Palau

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    This week our powerful Pacific team is in Palau for the Pacific Islands Forum Leaders Meeting. This is a major moment in our campaigns for Pacific climate justice and to stop deep sea mining. So what’s it all about, what can we expect over the coming days, and why is this year’s meeting in particular so important? Read on to find out!

    *Pawa is Melanesian word meaning collective power.

    Meet Moemoana Schwenke, our Pacific Climate Campaigner

    “When you love something deeply, you do everything you can to protect it.”

    @greenpeaceap

    For us in the Pacific, protecting our home is an expression of love. Follow our journey across the Pacific all the way to COP31 in Türkiye. Pacific voices continue to lead the call for climate justice champion our priorities and build a movement for a Fossil Fuel Free Pacific, from our islands to the world. Join the movement and follow the journey. @Moemoana Schwenke

    ♬ original sound – Greenpeace Australia Pacific

    What is the Pacific Islands Forum (PIF)?

    The Pacific Islands Forum, or ‘PIF’, is our region’s most important political organisation. It is where countries of the Pacific — including Australia and New Zealand — come together to collaborate on shared challenges and to set collective goals.

    The PIF Leaders Meeting is an annual weeklong event that includes a dedicated meeting of the Pacific’s small island developing states (PSIDS), many special side events organised by Pacific civil society, the leaders’ meeting itself, and more. At the end of the week, leaders issue a Forum Communiqué, capturing what they have agreed on, their shared priorities and the actions they will take together.

    This year’s meeting is being held in the beautiful northern Pacific nation of Palau, the same place our Pacific team gathered back in January to plan for the year.

    Islands in Palau
    © Hector John Periquin

    What’s at stake this year?

    Climate change has dominated the PIF for decades. Pacific leaders have been crystal clear it is their number one priority, and the annual gathering is the moment they can exert maximum pressure on Australia over its fossil fuel record.

    The voyage to COP31

    This year’s meeting comes less than three months before COP31, where Australia will take on the role of President of Negotiations — a role it has committed to undertaking in partnership with the Pacific — and less than a month before the ‘Pacific Pre-COP’, to be held in Fiji and Tuvalu.

    Following a fraught round of mid-year negotiations in Bonn, PIF leaders will need to set out a clear vision and priorities for COP31. These include accelerating a just global transition away from fossil fuels, defending science as the foundation of international climate cooperation, and increasing the availability and accessibility of finance for renewable energy and climate adaptation.

    Pictured left to right - 
- Dr Simon Bradshaw, COP31 Lead and report author, Greenpeace Australia Pacific
-Belyndar Rikimani, Campaigns and Research Lead, Pacific Islands Students Fighting Climate Change
-Shiva Gounden, Head of Pacific, Greenpeace Australia Pacific
    © Greenpeace / Marie Jacquemin

    Accountability for Australian fossil fuel exports

    Since the last PIF Leaders Meeting, Australia has signed the Belém Declaration on the Transition Away from Fossil Fuels. The declaration reaffirmed the legally binding commitment to help limit global warming to 1.5°C and recognised that this is incompatible with new fossil fuel production. Yet, Australia has continued to approve new coal and gas projects, including at least five since the last PIF Leaders Meeting.

    Barry Dick observes the community graveyard impacted by coastal erosion on Pele Island in Vanuatu.
    © Niki Kuautonga / Greenpeace

    What is Greenpeace doing?

    We’re going big this year, taking six members of our team to Palau to support Pacific leaders to hold the line, hold Australia accountable, and show the world what’s at stake. We’ll lobby leaders, hold press conferences, share our messages with the world, and support our incredible local partners in Palau.

    Members of the Greenpeace Pacific team at the Pacific Islands Forum leaders' meeting in Palau, 2026.

    How can you get involved?

    PIF is the first in a drumbeat of major moments where we’ll be carrying the voices of the Pacific to the world. Come October we’ll be voyaging to Fiji on our ship Oceania for the Pacific Pre-COP, and in November we’ll be off to Antalya for the world’s climate negotiations (COP31).

    Learn more about the Pacific way to a fossil fuel free future by checking out our report and exhibition.

    Follow our journey, and check back here for more ways to join the movement for climate justice. Together we have the pawa!

    Pawa in Palau

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    Climate Change

    From firefighting to future-proofing: Preventing wildfires must be the priority

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    Gill Einhorn is head of the Forest Future Alliance and Natalie Çilem is community lead of the Global Wildfire Leadership Network.

    Wildfires have devastated communities across the world this summer, claiming lives, displacing thousands of people and leaving billions in economic damage in their wake. In Europe alone, wildfires have already caused an estimated €19 billion in losses this year.

    They are an economic, financial and public health challenge that is growing faster than many governments and markets are prepared for – and exposing the real costs of poor land management.

    A system built for recovery, not resilience

    Far more money is currently spent responding to the disastrous effects of wildfires than preventing them in the first place. The United Nations Environment Programme estimates that more than half of wildfire-related spending goes towards response, while planning receives only around 0.2 percent. This problem is not limited to wildfires; over 95 percent of disaster aid between 2005 and 2017 was allocated to response, and less than 4 percent was directed towards prevention or preparedness.

    Forests are critical, but without investment in how land is managed and protected, their value is neither stable nor guaranteed. Protecting forests requires investing not only in conservation, but in the conditions that keep forests standing.

      Each dollar invested in wildfire-resistant construction could save around $210 in avoided future economic losses, according to a report by the World Economic Forum and Forest Future Alliance. Despite this evidence that prevention can significantly reduce future costs, wildfire resilience remains chronically underfunded.

      This spending discrepancy is creating significant challenges for insurers, asset owners and financial institutions. Global insured losses from natural catastrophes reached $107 billion in 2025, with wildfires, floods and storms accounting for 92 percent of claims.

      In this context, insurers are reassessing where and how they are willing to underwrite risk. Around 56 percent of global wildfire losses between 2000 and 2023 were uninsured. In some high-risk areas, insurers are scaling back coverage altogether, leaving homeowners, businesses and governments to shoulder a growing share of the costs – making it increasingly difficult to break even.

      Proven solutions are already paying off

      In many regions, wildfires are driven not by natural causes but by the deliberate clearing of land for agriculture. Degraded landscapes are becoming drier, more flammable and increasingly vulnerable to catastrophic loss, creating a vicious cycle of deforestation, economic damage and rising emissions.

      The answer is not simply stronger firefighting capacity. Governments, investors and businesses must work together to shift capital upstream into prevention, resilience and long-term landscape stewardship of healthy forests. That means planting appropriately, investing in heat-resistant species, exploring approaches that minimise fire footprints through active management, and exploring the AI and technology solutions that are burgeoning.

      A burnt olive tree in an area affected by a wildfire in Ano Sichaina near Patras, Greece, August 14, 2025. REUTERS/Louiza Vradi

      A burnt olive tree in an area affected by a wildfire in Ano Sichaina near Patras, Greece, August 14, 2025. REUTERS/Louiza Vradi

      Solutions to this already exist and are proven to have an impact. Following devastating wildfires year-on-year, Portugal shifted its approach to wildfire management, increasing prevention spending within its national rural fire management system from around 20 percent in 2017 to approximately 60 percent in 2022. While many countries remain locked in a reactive cycle of disaster response, public policy can shift investment upstream and make resilience a priority before fires occur.

      Indigenous communities have long used proactive land stewardship to reduce wildfire risk while supporting healthy and productive landscapes. For example, the Cheslatta Carrier Nation in British Columbia traditionally managed fuels through cultural fire practices but now implements mechanised fuel removal methods under commercial agreements. By combining Indigenous stewardship with sustainable forest management, Cheslatta is generating community benefits while also boosting wildfire prevention.

      Resilience can also be strengthened through finance and technology. FireSat, a partnership led by Earth Fire Alliance with Google.org, the Gordon and Betty Moore Foundation and Muon, is a satellite constellation designed for rapid wildfire detection. Scanning every 20 minutes, it can detect fires 400 times smaller than current systems and track them through smoke and darkness in almost real time. In California alone, FireSat could prevent up to 350,000 acres from burning each year. It has recently received significant new investments allowing it to expand towards a constellation of more than 50 satellites that will monitor every point on Earth every 20 minutes or less.

      In Brazil’s Pantanal, the Embrace the Forest initiative uses AI-powered detection towers across 2.5 million hectares to support earlier intervention and faster response. During the severe 2024 fire season, the initiative contributed to a 40 percent reduction in burned area compared to 2020.

      A drone view shows burnt cars following a wildfire in Dymi, near Patras, Greece August 14, 2025. REUTERS/Louiza Vradi

      A drone view shows burnt cars following a wildfire in Dymi, near Patras, Greece August 14, 2025. REUTERS/Louiza Vradi

      These examples illustrate what is possible when resilience is treated as an investment priority rather than a recovery cost. But we must ensure funding for these measures is scaled before disaster strikes. Initiatives like the Global Wildfire Leadership Network (GWLN) are key, bringing together corporate decision-makers, investors, insurers, governments and Indigenous leaders to direct investment towards prevention and align finance, technology and stewardship to protect nature, safeguard communities and strengthen future economic stability. With a goal of doing more together than the sum of our parts, the network focuses on Forest Future Alliance GWLN Solutions Labs – where partners sign up with the intent to collaborate.

      Rewarding prevention

      Financial incentives must be created that reward prevention. This can be done by scaling public-private partnerships, supporting long-term landscape stewardship, investing in community capacity including Indigenous wisdom and technology. Ultimately, our terrestrial natural reserves are critical infrastructure that support resilient economies and thriving communities.

      One in three people are dependent on forest services, goods and economic opportunities for survival, so it’s in all our interests to protect what we have. Forests support cooling, water and food security – and are a very cost-effective way of removing carbon dioxide from the atmosphere, where done appropriately.

      UN chief warns climate crisis “in overdrive” as El Niño threatens to fuel the fire

      No sector can solve this challenge alone. The benefits of wildfire resilience are shared across communities, governments, insurers, investors, utilities and businesses. A single intervention can protect homes and livelihoods, reduce insurance claims, secure water supplies and lower future public costs. Because the benefits are shared, the solutions must be too. Coalitions of actors can take proven approaches further than any one individual or organisation could alone.

      As wildfires continue to burn at an unprecedented scale, the opportunity now is to roll out solutions, shift investment upstream and build a future where resilience, rather than recovery, becomes the foundation of thriving economies.

      The post From firefighting to future-proofing: Preventing wildfires must be the priority appeared first on Climate Home News.

      From firefighting to future-proofing: Preventing wildfires must be the priority

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      Guest post: Why tough methane cuts are crucial for keeping warming ‘well-below’ 2C

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      Methane is a powerful greenhouse gas and the second-largest contributor to global warming after carbon dioxide (CO2).

      Methane traps heat in the atmosphere more efficiently than CO2, but has a significantly shorter lifespan, fading after just a few decades.

      Therefore, reducing emissions of methane – a gas primarily produced by agriculture, fossil fuels and waste management – is a powerful option for limiting global warming in the near-term.

      Yet climate strategies and models often only focus on CO2, or combine all greenhouse gases into one metric known as “CO2 equivalent”.

      The latter approach makes reducing methane emissions dependent on modelling choices and assumptions about the “equivalence” of methane and CO2.

      It hides the opportunities and challenges linked to methane’s high warming and short lifetime.

      In a new study, published in Communications Earth & Environment, we offer a different perspective that “decouples” CO2 and methane reduction and takes global warming limits as a starting point for determining the required level of methane cuts.

      We show that, even under the most ambitious existing national net-zero targets, an absence of methane reduction leads to peak warming that exceeds 1.85C above pre-industrial levels.

      The study highlights that, to limit peak warming to well-below 2C, net-zero CO2 targets must be complemented by stringent methane emissions cuts.

      CO2 equivalent

      How much methane corresponds to one tonne of CO2?

      The question is as difficult to answer as: ‘how much spaghetti equals a chicken?’ You could compare the two meals according to their calories, protein content or cost. Each metric can be convenient, but is only valid for that specific comparison – no amount of spaghetti is the same as a chicken.

      The same is true for the conversion of emissions of methane and other gases to CO2-equivalent emissions. It can be convenient, as it allows different gases to be compared or combined into a single number. This is why the metric is used in climate targets or evaluating the effectiveness of different mitigation options.

      But, because methane and CO2 have different atmospheric lifetimes and warming properties, any conversion is only valid for a chosen time horizon and a chosen baseline.

      Depending on the assumptions baked into calculations, methane mitigation can either appear as an immediate priority or framed as almost unnecessary.

      There are a number of metrics that scientists use to convert greenhouse gases – whether methane, hydrofluorocarbons or nitrous oxide – into CO2-equivalent emissions:

      • “GWP20” measures how much heat a greenhouse gas traps in the atmosphere over a 20-year period, relative to CO2. It emphasises urgent methane mitigation but has been criticised for its implicit discounting of future damages.
      • “GWP100” looks at a 100-year timeline. It gives more weight to long-term warming and is used in “integrated assessment models” (IAMs) used by scientists, national emission reporting to the UN and by the GHG Protocol used by companies.
      • GWP*” considers the rate of emissions, rather than warming over a fixed time horizon. Under GWP*, very limited methane reductions bring CO2-equivalent emissions to zero, meaning remaining methane emissions can be designated as causing “no additional warming”. (This interpretation remains controversial as it assumes the continuation of historical levels of warming.)

      IAMs are the tools used to generate future emissions scenarios. Because they combine CO2 and methane emissions, the impact of methane emission cuts alone is difficult to isolate in existing emission scenarios.

      IAM-generated scenarios also assume mitigation decisions driven by costs. Combinations of CO2 and methane emission pathways that are not purely cost-effective are, therefore, not represented, even though climate policy is messy and emission pathways are rarely cost-effective in the real world.

      Only a few countries – including Japan, Mexico and South Korea – specify methane mitigation targets.

      A different approach

      In our study, we separate CO2 and methane emissions and treat them as independent.

      Instead of choosing a conversion method, we suggest that states and organisations set a limit on peak global warming first, then, based on their existing net-zero targets, determine the minimum compatible methane reduction target.

      Companies and countries around the world have set net-zero targets focused on CO2, as well as those that include all greenhouse gases. As a result, our research looks at the necessary methane reductions for both types of goal. We consider scenarios where companies or countries deliver linear – in other words, steady – emissions reductions to reach net-zero.

      Using a simple climate model, we systematically combined methane and CO2 (or greenhouse gas) mitigation pathways starting in 2025 and calculated peak warming.

      The figure below shows how peak warming depends on both the year of reaching net-zero CO2 and the level of methane cuts.

      Peak global warming relative to 1850-1900 reached until 2100 (50% likelihood), for combinations of the year of global net-zero CO2 emissions (x-axis) and the change in global methane (CH4) emissions between 2020 and that year (y-axis), assuming linear trajectories. Black lines are contours of equal peak warming. The three bars on the right show independent estimates of where CH4 emissions could or would land on the same vertical scale: CH4 mitigation available at no net cost (IEA, red), the 2030 mitigation potential (Global methane status report, orange), and the current legislation scenario for 2050 (Global methane status report, purple). Adapted from Weber et al. (2026).

      The blue arrows in the figure show that to limit warming to 1.7C under a 2050 net-zero CO2 scenario, methane emissions would need to fall by at least 69% by 2050, relative to 2020.

      Our research also finds that, if an organisation or country’s 2050 net zero-target covers all greenhouse gases, its methane emissions would need to fall by 63% instead.

      However, under current policies, methane emissions are expected to increase by around 20% by 2050, relative to 2020. We find that this pathway would result in peak warming above 2C by 2050 – even if global CO2 emissions were to reach net-zero by that date (see purple bar on the right-hand side of the figure above).

      The figure also shows how, if methane emissions remained at 2020 levels and net-zero CO2 was delivered by 2040 or later, warming would exceed 1.85C. This level of warming is above what has been argued as consistent with the Paris Agreement’s “well-below” 2C limit.

      Conversely, cutting methane emissions by around one-third – in line with the Global Methane Pledge target for 2030 – could reduce peak warming by 0.15C, of which 0.05C could be delivered by interventions that come at no net cost. These are shown by the orange and red bars, respectively, on the figure above.

      The table below highlights the minimum compatible methane cuts for three different peak warming levels and net-zero CO2 or greenhouse-gas emission targets.

      Peak warming Year of net-zero CO2 emissions Year of net-zero greenhouse-gas emissions
      2050 2060 2100 2050 2060 2100
      1.7C -69% -63%
      1.8C -32% -56% -11% -47%
      2C +8% -8% -83% >50% +33% -78%

      Minimum methane emission reductions between 2020 and the year of net-zero emissions, consistent with peak warming of 1.7C, 1.8C, and 2.0C at 50% likelihood, assuming linear emission trajectories. For some net-zero targets and peak warming levels, there are no compatible methane mitigation targets (indicated by “–”).

      Remaining carbon budget

      The global carbon budget refers to the amount of cumulative CO2 emissions allowable while still meeting a particular global warming threshold.

      The 2021 climate science report from the Intergovernmental Panel on Climate Change (IPCC) and a 2023 Nature study estimated that, by 2025, the remaining carbon budget for holding warming to 2C would be around 1,000-1,150bn tonnes of CO2 (GtCO2).

      We find that these estimates are founded on the assumption of methane reductions of 27-35% by 2050, relative to a 2020 baseline. (A 2024 Communications Earth & Environment study reached similar conclusions.)

      Under the GWP* metric, where methane emissions are only cut to maintain “no additional warming”, the remaining carbon budget would be constrained. The best estimate of a 2C budget shrinks by around 30% to approximately 750GtCO2.

      Finally, if methane emissions are not cut at all in the future, our findings suggest that the remaining carbon budget for 1.7C of global warming has, in effect, already been exhausted.

      Our analysis shows how peak warming depends on both CO2 and methane reduction – and how methane-specific targets can help refine existing net-zero targets.

      Crucially, we show that complementing net-zero CO2 targets with stringent methane cuts is necessary to limit peak warming to well-below 2C.

      Weber, K. et al. (2026) Limiting warming by CO2 and methane mitigation in an expanded scenario space, Communications Earth & Environment, doi:10.1038/s43247-026-03832-1

      The post Guest post: Why tough methane cuts are crucial for keeping warming ‘well-below’ 2C appeared first on Carbon Brief.

      Guest post: Why tough methane cuts are crucial for keeping warming ‘well-below’ 2C

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