Connect with us

Published

on

Only around a third of the latest country climate pledges submitted to the UN express support for the “transition away from fossil fuels”, according to Carbon Brief analysis.

Several countries even have used their 2035 climate plans to commit to increasing the production or use of fossil fuels, predominately gas, the analysis finds.

The first global stocktake of progress to tackle climate change, agreed at the COP28 climate summit in Dubai in 2023, calls on all countries to contribute to “transitioning away from fossil fuels”.

Countries were meant to explain how they are implementing the outcomes of the global stocktake, including their contribution to transitioning away from fossil fuels, in their latest climate plans.

However, just 23 of the 63 plans submitted to the UN so far express support for “transitioning away from fossil fuels”, or the “phase out” or “phase down” of their use.

In addition, six countries, including Russia, Nigeria and Morocco, use their climate plans to commit to boosting gas production.

Some two-thirds of countries have not yet announced or submitted their pledges, missing not only the UN deadline of 10 February, but also an extension to September.

How to address the lack of sufficient action from countries with their latest plans is billed to be one of the major issues up for debate at the COP30 climate summit in Brazil next month.

Taking stock

In 2015, countries forged the Paris Agreement, the landmark deal to keep temperature rise “well-below” 2C, with “aspirations” to limit global warming to 1.5C of warming by the end of this century.

At the time, countries’ initial pledges were not enough to put the world on track to meet the temperature targets, so they built a “ratchet mechanism” into the Paris Agreement, requiring them to keep increasing their ambition in the following years.

As part of this, countries agreed to submit new, more ambitious plans every five years detailing what they are doing to take action on climate change and adapt to its impacts. These are called “nationally determined contributions” (NDCs).

The Paris Agreement also stated that, following on from these plans, “global stocktakes” should be conducted to assess collective progress in meeting the temperature goal.

The first global stocktake concluded at the COP28 climate summit in Dubai in 2023, with countries agreeing to a new document setting out how they will respond to a lack of sufficient action to meet the Paris goals.

The two-week talks saw fierce debate about how fossil fuels – the main driver of human-caused climate change – should be referred to in this text.

Activists demonstrating at the 2023 COP28 climate summit in Dubai Credit: Associated Press.

In the end, the stocktake “calls on” all countries to “contribute to” a list of global goals, including “transitioning away from fossil fuels…accelerating action in this critical decade” towards net-zero by 2050.

It was the first time that countries formally acknowledged the need to transition away from fossil fuels in almost 30 years of international climate negotiations.

However, many countries were disappointed that the text did not contain a firmer commitment to phase out all fossil fuels, or even just those with “unabated” emissions.

After Dubai, countries were expected to come up with new NDCs for 2035 that explained how they responded to the priorities set out in the stocktake.

The deadline for submitting the “3.0” NDCs was 10 February 2025, which 95% of countries missed.

On 24 September, the UN convened a climate summit in New York at the sidelines of the UN general assembly in the hope of encouraging more countries to come forward with new NDCs.

China stole the show at the event, announcing a pledge – although not yet formally submitted to the UN – to cut greenhouse gas emissions to 7-10% below peak levels by 2035. Several other countries announced new plans, including Russia, Turkey and Bangladesh.

Following the summit, around one-third of countries have announced or submitted their 2035 NDCs.

Fossil-fuel focus

For the analysis, Carbon Brief reviewed each of the NDCs submitted to the UN to determine whether they express support for “transitioning away” from fossil fuels or for phasing them out or “down”.

Countries were considered to have expressed support if they explicitly mentioned the terms “transition” or “phase out/down” in relation to “fossil fuels” when speaking about their own actions to address climate change.

Some countries spoke in general terms about “reducing” or “replacing” fossil fuels, but did not explicitly reference the need to transition away from or phase them down or out. Others spoke about transitioning to a clean or renewable-based economy, but did not explicitly mention fossil fuels.

For the purposes of this analysis, all of these countries were considered to have not expressed support for the need to transition away from fossil fuels.

In addition, some countries mentioned in their NDCs that the global stocktake calls for a transition away from fossil fuels, but did not say that transitioning away from fossil fuels would be part of their own actions to address climate change.

These countries were also considered to have not expressed support for the need to transition away from fossil fuels.

Overall, the results show that only one-third of countries express support for the need to transition away from fossil fuels in their NDCs.

Countries used varying language when speaking about the need to transition away from fossil fuels.

Some directly acknowledged that transitioning away from fossil fuels was a key conclusion of the global stocktake and committed to doing this within their own borders.

This includes the UK, Brazil, Canada, Australia, Singapore, Lebanon and Niue. For example, the UK’s NDC states:

“At home and in line with the outcomes of the GST [global stocktake], the UK is committed to transitioning away from fossil fuels to achieve net-zero by 2050.”

Other countries chose to commit to “phasing out” fossil fuels instead of “transitioning away”.

This includes Iceland and Vanuatu. Similarly, Colombia’s NDC says:

“NDC 3.0 reaffirms that the phasing out of fossil fuels is not only a climate imperative, but also an opportunity to strengthen energy sovereignty [and] democratise the benefits of the transition.”

(Colombia and Vanuatu were two of the countries that were disappointed not to see a commitment to phase out fossil fuels included within the global stocktake text.)

Barbados, an island nation known for its strong commitment to climate action, committed in its NDC to “achieve a fossil fuel-free economy” by 2040. In addition, Chile pledged to contribute to the “elimination of fossil fuels”.

In the analysis, these pledges were considered to be support for transitioning away from fossil fuels, despite not using the terms “transition” or “phase out”.

The table below shows the language used by each of the 21 countries that expressed support for transitioning away from fossil fuels, according to the analysis.

Country Expression of support for ‘transitioning away from fossil fuels’ in NDC
United Kingdom “At home and in line with the outcomes of the GST, the UK is committed to transitioning away from fossil fuels to achieve net-zero by 2050.”
Brazil “Brazil will respond to the call to contribute to global efforts under paragraph 28 of
decision 1/CMA.5, through the policies and national efforts below, including those under the
National Climate Plan. In addition, Brazil would welcome the launching of international work for
the definition of schedules for transitioning away from fossil fuels in energy systems, in a just,
orderly and equitable manner, with developed countries taking the lead, on the basis of the best
available science, reflecting equity and the principle of common but differentiated responsibilities
and respective capabilities in the light of different national circumstances and in the context of
sustainable development and efforts to eradicate poverty, as per paragraph 6 of decision 1/
CMA.5.”
Canada “Canada also remains committed to implementing the mitigation outcomes of the Global Stocktake
(GST), agreed at COP28…This includes…transitioning away from fossil fuels in energy systems.”
Lebanon “Guided by the UAE Consensus reached at COP28, which calls on all Parties to transition away from fossil fuels and strengthen support for adaptation, this NDC reflects Lebanon’s commitment to scaling ambition while addressing national vulnerabilities.”
Iceland “Iceland’s NDC takes note of the outcome of the global stocktake, according to Decision 1/CMA.5. Specifically, Iceland’s NDC seeks to represent the need for deep, rapid and sustained reductions in greenhouse gas emissions in line with 1.5°C pathways by contributing to the phase-out of fossil fuels across sectors and the strategic, fair and ambitious implementation of carbon capture, utilisation and storage, according to para. 28.”
Barbados “In 2020, the Government of Barbados set the aspirational goal to achieve a fossil fuel-free economy and to reduce GHG emissions across all sectors to as close to zero as possible by 2030. In light of the significant challenges faced by the country, the aspirational goal is currently expected to be reached around 2040.”
Chile “In 2023, within the framework of the 28th Conference of the Parties to the UNFCCC (COP) in Dubai, the report on the First Global Stocktake, designed within the framework of the Paris Agreement to assess the global response to the climate crisis, was presented…Among its main conclusions, the agreement to move towards the elimination of fossil fuels in energy systems…stands out. All these conclusions are addressed in this NDC, demonstrating Chile’s commitment to climate ambition.”
Vanuatu “Moving beyond our current net-zero status, this NDC recommits Vanuatu to rapidly phasing out fossil fuels, deeply decarbonising and transitioning completely to a circular economy.”
Pakistan “Natural gas and furnace oil are set to decline, with net reductions of 2,147 MW and 430 MW respectively, as per IGCEP 2025-2035, signaling a gradual phase down of fossil fuels in Pakistan’s capacity mix.”
Colombia “NDC 3.0 reaffirms that the phasing out of fossil fuels is not only a climate imperative, but also an opportunity to strengthen energy sovereignty, democratize the benefits of the transition, and consolidate Colombia as a Power of Life.”
Niue Niue understands the need to transition from fossil fuel-based electricity generation to renewable energy to reduce the GHG emissions footprint and ensure energy security.”
Singapore “Singapore is contributing to the first global stocktake’s call to triple global renewable energy capacity and double the global average annual rate of energy efficiency improvements by 2030. We are also supporting efforts to transition away from fossil fuels in energy systems and phase out inefficient fossil fuel subsidies.”
Australia “The global stocktake recognised the global direction of travel in its consensus call to transition away from fossil fuels in energy systems and to phase-down unabated coal-fired power. In Australia, our transition is underway.”
United Arab Emirates “The GST Outcome at COP28, together with the broader UAE Consensus and the work under the Troika, has provided a strong impetus for the UAE NDC 3.0. The outcome of the first GST notably emphasizes the need to transition away from fossil fuels in energy systems in a just, orderly and equitable manner, urging parties to adopt ambitious, economy-wide emission reduction targets.”
Japan “The items listed in decision 1/CMA.5 have been incorporated to the greatest extent possible into
the Plan for Global Warming Countermeasures, which is a comprehensive implementation plan for achieving Japan’s NDC.”
Bolivia “The persistent dependence on fossil fuels, both for electricity generation and transportation, not only contributes to national greenhouse gas emissions, but also exposes the country to volatility in international oil and gas prices, highlighting the urgency of a fair, sovereign, and resilient energy transition toward renewable sources.”
Nicaragua “The transition to an energy matrix less dependent on fossil fuels is a fundamental priority of
the government.”
Marshall Islands “This NDC also demonstrates our drive, our achievements, and the challenges we face.
In particular, we detail our domestic actions to contribute to the collective commitments
made following the global stocktake, including the tripling of renewable energy, doubling of
energy efficiency and removal of fossil fuel subsidies, all in pursuit of accelerating the
transition away from fossil fuels this decade.”
Cambodia “This transition will be implemented in two key phases: 70% renewable energy by 2030, followed by a further increase to 72% by 2035, ensuring a gradual yet decisive shift away from fossil fuel dependency in the power sector.”
Bangladesh “Transitioning away from fossil fuels in energy systems, in a just, orderly and equitable manner [is] central to Bangladesh’s contribution to the global response to climate change. The NDC 3.0 commitments are designed not only to reduce Greenhouse Gas (GHG) emissions but also to accelerate the just energy transition, promote zero- and low-emission technologies, and enhance climate resilience.”
Tuvalu “We are steadfast in our transition to 100% renewable energy.”
Sri Lanka “With abundant solar, wind, and hydropower resources, Sri Lanka has a clear opportunity and expressed ambitious commitments to move
towards total electricity generation based on renewable sources, to transition away from fossil fuels toward cleaner, decentralised energy systems.”
Nepal Nepal’s NDC is “informed” by Decision 1/CMA.5 Outcome of the first GST, “such as 1.5C decarbonisation pathway…just transition away from fossil fuels in energy systems.”

Source: Carbon Brief analysis of UN NDC registry

Separately, the thinktank E3G has examined how countries speak about their policies for reducing fossil fuels in their NDCs.

It found that more than two-thirds of countries include “explicit references to displacing fossil fuels in their electricity mix”.

However, E3G also noted that “specific language on winding down the production of coal, oil, and fossil gas is lacking in almost all NDCs”.

‘Transitional fuel’

Carbon Brief also examined each of the submitted NDCs to see how countries speak about new fossil-fuel production and use within their borders.

Six of the 64 nations – around 10% – used their NDCs to pledge to increase fossil-fuel production or use, predominately gas, claiming this could contribute to their efforts to lower emissions.

In its NDC, the world’s fourth biggest emitter, Russia, says it “emphasises the importance of implementing a just transition to low-emission development models using all available solutions”, including “gas as a transition fuel and technologies for reducing emissions in coal-fired power generation”.

During negotiations on the stocktake text in 2023, Russia had pushed successfully to include a controversial paragraph that says “transitional fuels can play a role in facilitating the energy transition while ensuring energy security”, Climate Home News reported.

The publication noted that, after this text was agreed, Antigua and Barbuda negotiator Diann Black-Layne called it a “dangerous loophole”, adding that gas is also a fossil fuel that “we need to transition away from”.

Several African nations, including Nigeria, Morocco, Mauritius and Zimbabwe, also pledged to boost the production or use of gas as part of their “climate” actions.

Nigeria, Africa’s second biggest emitter, says that the country “relies heavily on the oil and gas industry” and that the sector will be “called upon to further grow while adopting sustainability measures”. It continues:

“Natural gas use will be boosted, serving as a key transition fuel in Nigeria’s move towards increased adoption of renewable energy for meeting its net-zero emissions target.”

The world’s energy watchdog, the International Energy Agency, recently reemphasised that there would be no need for any new fossil-fuel production, if the world cuts emissions in line with limiting global warming to 1.5C.

It comes after the world’s top court this year concluded that new fossil-fuel production, consumption, the granting of exploration licences or the provision of subsidies “may constitute an internationally wrongful act”, leaving the states involved vulnerable to legal action.

COP30 calls

After nearly all nations missed the deadline for submitting NDCs in February, UN climate chief Simon Stiell asked laggard countries to do so by the end of September.

This will allow their plans to be included in a new report synthesising the level of progress contained within the latest NDCs, which is due to be published on 24 October. (Less than a third of nations met Stiell’s request.)

The report will come just before COP30, which will take place from 10-21 November in the rainforest Brazilian city of Belém.

Whether and how to respond to the insufficient progress contained within these NDCs, including whether to call for increased ambition in line with the outcomes of the first global stocktake, are among the key issues up for debate at the summit.

The Brazilian presidency is pushing for a formal COP decision on any “disappoint[ment]” over NDCs falling short, collectively, of what is needed to avoid dangerous global warming.

However, other countries would need to agree to this proposal at the summit.

The post Revealed: Only a third of national climate pledges support ‘transition away from fossil fuels’ appeared first on Carbon Brief.

Revealed: Only a third of national climate pledges support ‘transition away from fossil fuels’

Continue Reading

Climate Change

Pawa in Palau

Published

on

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

Continue Reading

Climate Change

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

Published

on

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

    Continue Reading

    Climate Change

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

    Published

    on

    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

    Continue Reading

    Trending

    Copyright © 2022 BreakingClimateChange.com