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It’s the start of the second and final week of the annual mid-year UN climate talks, half-way between COPs, which take place every year in Bonn – the old capital of West Germany and the birthplace of Beethoven.

As the 8,000 or so delegates make their way to the World Conference Centre, next to the River Rhine and UN Climate Change’s tower block headquarters, Joe Lo and Matteo Civillini are headed there on the Eurostar thanks to your generous donations!

The first week of the talks passed off relatively smoothly – despite leaving a fair amount of work to finish by Thursday, the last day of the so-called SB60 meetings. Last year, it took nine days and desperate pleading to even agree on an agenda. This year, that was wrapped up without fuss on the opening morning.

That’s not to say there was no drama. At the start of the opening plenary, the head of Climate Action Network (CAN) International Tasneem Essop and Argentine climate justice activist Anabella Rosemberg – got up on stage uninvited.

Essop held up a Palestine flag and Rosemberg a sign saying “No B.A.U. [business as usual] during a genocide”. Both said they were doing it in a personal capacity, rather than as a part of CAN.

After the session was briefly suspended, they were escorted off the stage and out of the venue by UN security. The badges needed to access the talks were taken off them.

video of the incident shows the camerawoman – CAN press officer Danni Taafe – telling a UN security guard “you’re hurting me”. He replies “good”. Taafe told Climate Home she has asked the UNFCCC how to file a complaint but has yet to receive a response.

Anabella Rosemberg and Tasneem Essop protest at the opening plenary (Photo: Kiara Worth/IISD ENB)

Shortly after the session re-started, the Russian government said it would block the agenda in protest at some of its delegation not receiving visas from the German government.

After some frantic phone calls to the German foreign office, the talks’ co-chairs received assurances that the visas were being sorted ASAP and the Russians agreed to resume.

Climate Home has heard from three sources that visa issues are not limited to the Russians and that some African delegates – both from government and civil society – had not received their visas either, or only did so after a lot of stress.

CAN Uganda’s Proscovier Nnanyonjo Vikman told Climate Home she arrived five days late and had to rebook her flight because of visa delays. She said the talks should be moved away from Germany to a place everyone can access.

“We don’t need to die coming to Bonn – let’s move” she said, adding that many feel “they are being harassed to enter a country that obviously doesn’t like them”.

Finance negotiators wear pink to show commitment to gender-inclusive financing on June 8, 2024 (Photo: IISD/ENB Kiara Worth)

Money talks

With the agenda adopted last Monday, negotiators on the post-2025 finance goal – known as the New Collective Quantified Goal (NCQG) – started exchanging opinions on a 63-page draft text.  

At this early stage – with the NCQG due to be agreed at COP29 in Baku in November – many countries are keeping suggestions on specific figures close to their chest, particularly as the UN is due to release a needs determination report in October which will offer guidance.

But the Arab Group has put forward a figure of $1.1 trillion a year from 2025 to 2029. Of this, $441 billion should be public grants and the rest should be money mobilised from other sources, including loans offered at rates cheaper than the market.

The group, backed on this by the G77+China, has even suggested how developed countries could raise that sum – through a 5% sales tax on developed countries’ fashion, tech and arms companies – plus a financial transaction tax.

Military emissions account for 5% of the global total, said Saudi Arabia’s negotiator. This surprised many observers, as Saudi Arabia is the world’s fourth-biggest per capita spender on the military and gets much of its equipment from Western arms companies.

But developed countries insist they can’t stump up all the money and are asking for help. The EU’s negotiator said the NCQG should be a “global effort” while Canada’s said it should come from a “broad set of contributors”. In other words, wealthier and more polluting developing nations like the Gulf nations should also play their part.

But developing countries remain, at least publicly, united against these attempts to differentiate between them. They say developed countries have the money – it’s just a question of whether they have the “political will to prioritise climate change”.

The other emerging divide is whether to include a sub-target for loss and damage in the NCQG. Developing countries want this but developed countries are opposed.

Asked why, the EU’s negotiator told Climate Home the Paris Agreement “does not provide any basis for liability or compensation”, and that climate finance under the NCQG should consist only of two categories: mitigation and adaptation.

The talks’ co-chairs – Australian Fiona Gilbert and South African Zaheer Fakir have slimmed down the sprawling 63-page document they presented to Bonn into a mere 45-page one. Negotiators will continue hashing it out this week. Talks continue (and are livestreamed) at 3-5 pm today and tomorrow.

Technical fights over carbon markets 

After talks over the Paris Agreement’s carbon offsetting mechanisms collapsed in dramatic fashion at COP28, negotiators are trying to pick up the pieces.

A vast number of issues remain on the table, but diplomats have selected a number of highly technical elements to wrangle over in Bonn.

Observers said the mood is more cordial than in Dubai, but the underlying battle between a tighter regulatory regime and a ‘no-frills’ approach is still very much alive.

Much discussion time last week was taken up with the thorny issue of establishing a process for countries that host offsetting projects to authorise the release of carbon credits.

This is important as approval triggers a so-called ‘corresponding adjustment’, meaning governments can no longer count those emissions reductions towards their national climate targets.

A sizeable group of developing nations – including China, Brazil, the African Group and least-developed countries (LDCs) – want to be able to revoke or revise those authorisations in certain circumstances under Article 6.2 – the mechanism for bilateral exchange of credits.

That would afford them flexibility in case they give out too many offsets and this puts hitting their own climate targets at risk. But a group of developed countries and small-island states are pushing back.

Negotiators are also debating once again whether activities aiming to “avoid” – rather than reduce – emissions should be allowed in the new UN carbon market under Article 6.4. Most countries are against that, while only the Philippines are actively pushing for their inclusion.

As some observers have pointed out, giving a green light to the inclusion of emission avoidance could create some perverse incentives, such as fossil fuel companies promising to leave some oil or gas fields unexplored, then quantifying the avoided emissions and selling them as carbon offsets.

Transparency call 

UN Climate Change head Simon Stiell has just made a speech reiterating a call by COP29 host nation Azerbaijan for countries to get their biennial transparency reports in by November’s Baku summit.

These reports are new. Only Andorra and Guyana have published them so far. They are intended, as Stiell put it, to “shine a light on progress”, showing whether countries are on track with their national climate plans or “are the lights flashing red on the console?”

They don’t have to be perfect, he said. “Nobody is expecting countries facing enormous human and economic challenges to submit a platinum-standard report first time around”. But, he added, “I encourage you all to submit the best possible report you can, this year.”

News in brief

Costly climate damage: Extreme weather has caused more than $41 billion in damage in the six months since COP28, according to a new report by Christian Aid. Four extreme weather events in this time – all scientifically shown to have been made more likely and/or intense by climate change – killed over 2,500 people, it says. They encompass flooding in Brazil, the UAE and East Africa, and heatwaves across Asia. The charity says these figures underscore the need for more loss and damage funding.

How to set a ‘good’ 2035 target: Climate Action Tracker (CAT) has released a guide for the 2035 targets countries must include in their next NDCs, saying they should be ambitious, fair, credible and transparent, with developed countries ramping up climate finance. They also need to strengthen their existing 2030 targets, which “are far from” aligned with the 1.5C global warming limit, it adds. Climate Analytics CEO Bill Hare warns that the CAT projection of warming from current policies is still at 2.7C – unchanged from 2021. “Governments appear to be flatlining on climate action, while all around them the world is in climate chaos, from heatwaves to floods and wildfires,” he warns.

Raise the bar for NDCs 3.0: new briefing from the Energy Transitions Commission, a coalition of industry and other players in the energy sector, says that if governments reflect existing policy commitments made at COP28 and nationally, as well as the latest technological progress, in the next round of NDCs (known as NDCs 3.0), overall ambition levels could almost triple. That would save around 18 gigatonnes of CO2e per year in 2035 and put the world on a trajectory to limit warming to 2C, the commission says.

Forests missing in NDC action: Despite global commitments to halt deforestation by 2030, only eight of the top 20 countries most responsible for tropical deforestation have quantified targets on forests in their current NDCs, says a new report from the UN-REDD Programme. Current NDC pledges submitted between 2017–2021 do not meet the 2030 goal to halt and reverse deforestation, it adds. NDCs must integrate existing national strategies to reduce emissions from deforestation and forest degradation (REDD+) – which 15 of the 20 countries have adopted – while the NDCs 3.0 should include concrete, measurable targets on forests, it recommends.

The post Bonn bulletin: Crunch time for climate finance appeared first on Climate Home News.

Bonn bulletin: Crunch time for climate finance

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Climate Change

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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    Climate Change

    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

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