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Call to triple adaptation finance

At COP26 four years ago, governments agreed to “urge” developed countries to double finance for adapting to climate change up to around $40 billion a year by 2025.

That goal ends this year, although we will not know until 2027 if it has been met. But at a press conference in Bonn this afternoon, the Least Developed Countries group chair Evan Njewa called for a successor goal – tripling adaptation finance by 2030 on 2022 levels. “Adaptation is a lifeline,” he explained.

Other developing countries are likely to back this. Grupo Sur and the Like-Minded Developing countries have made the same call in different negotiating rooms and Njewa said he was sure that the small islands group AOSIS would back it too.

“We’re never going to say no to adaptation finance,” AOSIS finance negotiator Thibyan Ibrahim told Climate Home in Bonn. But he noted that even tripling “does little to close the adaptation finance gap”. The UN estimates that developing countries need $160-340 billion a year by 2030, whereas tripling on 2022 levels would bring in just under $100 billion.

Bonn bulletin: Developing nations ask x3 adaptation finance by 2030

Last year in Baku, developed governments would not agree to having a sub-goal on adaptation in the wider $300-billion-by-2035 finance goal and it’s not currently clear which negotiating track a new adaptation goal could be included in.

The doubling-by-2025 goal was in the COP26 cover decision – a stand-alone declaration all governments agree to – but the COP30 Presidency has said it does not want a cover decision.

It would fit in the Baku to Belem roadmap to $1.3 trillion or the Global Goal on Adaptation. But the roadmap is not an official negotiated UN agreement – so may not be followed up on – and developed-country governments have been resisting financial indicators in the Global Goal on Adaptation.

Meanwhile outside the world of UN climate talks, a recent CARE report showed that adaptation finance is likely to fall by 10% in 2026. France, Germany, the Netherlands and particularly the UK are set to make big cuts between 2025 and 2026.

The US is giving nothing in either 2025 or 2026. Commenting on US climate finance cuts generally, Njewa said he expects “someone somewhere to rise up and fill in the gap that that party has left”.

From Bonn to Nairobi?

Denouncing the visa problems faced by some developing country delegates heading to Bonn, more than 200 climate campaign groups made a joint call yesterday for governments to consider whether Germany should remain the default host for the mid-year climate talks.

Chanting “no borders, no nations, no visa applications”, a dozen campaigners gathered outside the conference centre on Tuesday morning, holding up a banner calling to move the annual talks to “visa-friendly countries”.

With many of those affected by the perennial issue unable to protest themselves, the demonstrators played a voice note from Roaa Alobeid, a young Sudanese climate activist who spoke movingly at COP28 about the war in her country.

She said she had gone to great lengths to get a visa for the Schengen area, which includes Germany, making an appointment, submitting 15 documents – including five letters of support and a bank statement – but was still rejected.

“I’m not there. I will never be there”, she said. “Why? I’m not worth it?” “We shouldn’t be left behind when we are the ones impacted.”

Cameroonian activist Zoneziwoh Mbondgulo-Wondieh did make it, but told the protest her one-year-old daughter had been refused a visa for being too young. She asked why Germany would implicitly tell a nursing mother they must stay at home and not work abroad.

When Climate Home questioned the German foreign office on this issue last year, a spokesperson said it was important to the government that all delegates could attend but there are legal requirements for getting a visa for the EU’s Schengen zone of free movement.

Rachitaa Gupta, head of the Global Campaign to Demand Climate Justice, said it would be better to hold the annual mid-year talks somewhere like Nairobi or Bangkok – where UN facilities already exist and visas are easier to obtain. Holding the meetings in the Global South would also be cheaper, Gupta added.

The UN Environment Assembly is hosted in Nairobi, Kenya. (Natalia Mroz/ UN Environment)

Climate finance on the rise – mostly for the rich

New figures out today paint a fairly positive picture of global climate finance, showing it climbed to a record $1.9 trillion in 2023, more than tripling over six years.

Climate Policy Initiative (CPI), which compiles the data, said that at the current rate of growth, the world could deliver $6 trillion in annual climate investment – the most conservative estimate of needs – by 2028.

Private-sector funding rose above $1 trillion for the first time in 2023, driven by household spending on electric vehicles, solar and energy-efficient housing – with clean energy in advanced economies and China receiving the bulk of the money.

While this suggests the long-touted need to “shift the trillions” towards green investment is underway, the headline numbers mask the fact that many of the poorest countries are still failing to receive anything like the amounts they need.

The CPI report shows that overall public climate finance fell by about 8% from 2022 to 2023, as government budgets were tight after the COVID-19 pandemic. It also warned that recently announced cuts to official development assistance, in countries such as the US and the UK, raise concern that money from this source could decline further.

International climate finance for emerging markets and developing countries reached $196 billion in 2023, with 78% of that from public sources. Yet while both climate-related development finance and private investment rose, CPI said the least-developed countries still face barriers to accessing affordable capital, and need more financial innovation and support.

In a separate report released on Monday, however, Oil Change International and 17 other NGOs warned that a widely used approach of using government money to lower investment risk and bring in more commercial cash – known as “blended finance” – is falling short of expectations.

The report found that every public dollar of concessional lending is bringing in 4-7 times less private investment than anticipated, leaving the Global South with massive shortfalls of cash for its energy transition. Most money, it said, is going to Global North countries and China, with the remaining 69% of the world’s population receiving just 15% of finance in 2023-2024.

“A just energy transition is dramatically more affordable than continued fossil fuel dependence. But unfortunately affordable doesn’t mean ‘attractive to banks and hedge funds’,” said Bronwen Tucker, global public finance lead at Oil Change. It is clear from the data that private investors are not fit to lead the way to the fossil free future we need, and that governments must step in.”

Mineral justice for Africa

Efforts to revive the Lobito Corridor trade route in central Africa must prioritise local economic development over raw material exports, researchers at the International Institute for Environment and Development (IIED) said, as campaigners in Bonn call for justice for resource-rich countries and an end to the extractive injustices of the fossil fuel era.

The US and the European Union are providing financial support to Angola, the Democratic Republic of Congo and Zambia to upgrade their infrastructure to aid transport of critical energy transition minerals like cobalt and copper through a rail system which terminates at the port of Lobito on Angola’s Atlantic coast.

In a policy brief issued this week, highlighting the Corridor’s opportunities and challenges for a just transition, the researchers questioned how the project’s development will benefit the wider economies of the countries involved, while protecting social benefits and human rights including being fair to the people whose land it might encroach upon and the artisanal miners who dig up many of the raw materials.

They said the involvement of the EU and the US has raised concerns in participating countries such as Zambia, where a parliamentary committee has said the Lobito Corridor project appears to focus on “mopping up critical raw materials” to respond to the energy security concerns of wealthy nations without adding value to the countries.

Lorenzo Cotula, IIED principal researcher, said if the EU and other prospective funders are interested in a genuine, long-term partnership with Angola, Congo and Zambia, they should support their efforts to promote economic development and improve the lives of their citizens.

“This project shouldn’t just be a means to export more raw materials more quickly to wealthier countries, or another chess piece in the great power game,” Cotula said.

“Millions of people in mineral-rich, lower-income countries are being sidelined in a global rush for materials to power electric cars, computers and even military technologies in richer nations,” he added.

Sharing similar concern, campaigners from Power Shift Africa and the Natural Resource Governance Institute (NRGI) convened a press conference at the ongoing talks in Bonn calling for the need for just minerals in the just transition, because one cannot exist without the other.

Anabella Rosemberg, senior advisor on just transition at Climate Action Network International (CAN-I), said the transition that is happening is not one that is needed for a climate-compatible world because the needs of resource-rich countries are being ignored.

Rosemberg said there is need for international cooperation to overturn the current competition over resources, adding that “we know that investment and trade deals are being arranged to secure the supply of these minerals, and in the end, we are reproducing all the mistakes that have been done in the past with the fossil-based economy”.

Samira Ally, project officer at Power Shift Africa, said Africa’s mineral wealth can accelerate a global shift to net zero when governed by justice and stability with necessary guardrails in place.

To do this, she asked governments to integrate language from the G20 and the UN panel on critical minerals into the climate talks and national climate plans so that they “reference sustainable supply chains and the right to development and industrialisation in the Global South”.

The post Bonn bulletin: Developing nations call for adaptation finance to triple by 2030 appeared first on Climate Home News.

Bonn bulletin: Developing nations call for adaptation finance to triple by 2030

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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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