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Welcome to Carbon Brief’s China Briefing.

China Briefing handpicks and explains the most important climate and energy stories from China over the past fortnight. Subscribe for free here.

Key developments

Critical mineral ‘deal’

TRANSITION TURMOIL: US president Donald Trump said China and the US reached a “deal” after talks were held in London, reported the BBC News, adding that “he said China had agreed to supply US companies with magnets and rare earth metals”. Shortly after the announcement, a Chinese manufacturer confirmed that it received “export permits” to countries including the US, according to Bloomberg. China’s earlier move to impose export curbs on critical minerals had “hit” the global auto industry, said Reuters. In answering Carbon Brief’s question of how the recent mineral disputes may affect global energy transition, Tian Jietang, director-general of the research department of industrial economy at the Development Research Center of the State Council said that the minerals are a “very important factor” for “new energy” development, but the “reason” behind the turmoil is “not from China”. China is “always open” to cooperate with the world for “faster green transition”, he added at an Asia House event.

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‘FIRM’ CLIMATE ‘ACTIVIST’: Tian emphasised that China has always been a staunch contributor to global “green transition”. A similar line appeared in a comment article in the Communist party-affiliated newspaper People’s Daily, which called China a “firm activist and important contributor to the world’s green development”. In another People’s Daily article, the newspaper explained that the “direct reason” behind China’s “insist[ence] on carbon reduction” is that “climate warming threatens human survival and the continuation of civilisation”. It added that such “green and low-carbon transition” is also good for China’s economy and society. China Daily said the US’s tariffs on “clean energy products”, on the contrary, are “negatively affecting both [the] US and global green energy”.

Renewable pricing shift

MARKET PRICE: China entered a ”new stage of market-based pricing” for renewables on 1 June, after a notification was issued earlier this year, reported local newspaper Beijing Daily. The newspaper said projects that started operating before June would be paid prices pegged to the local coal-fired electricity price, in line with the previous policy, whereas electricity prices from projects operating after June will not be “protected”. (See the Carbon Brief explainer on the new policy.) The Shanghai-based Paper said there had been a rush to complete renewable projects before the June deadline – new installations of solar in April alone soared by 215%. As of April, the total capacity of wind and solar reached 1,530 gigawatts (GW) in China, “surpassing” the capacity of thermal power, reported industry news outlet BJX News. However, some wind and solar projects have been halted as a result of the new policy, said financial publication Yicai. The outlet quoted an unnamed source saying the returns for some projects are “no longer economically feasible”.

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‘NEW ELECTRICITY SYSTEM’: Meanwhile, the plans to construct the “first batch of pilot projects” for a “new electricity system” was announced, reported BJX News. It added that according to a notification from the National Energy Administration (NEA), the pilot projects will focus on seven areas, including building “smart microgrids” and “virtual power plants”, better connecting clean energy “bases” to the rest of the country and developing “next-generation coal power”. Quoting experts, China Energy Net said that the success in building such a new system lies in transferring the current system from a “single” network to an “‘adaptability-early warning’ planning paradigm” over the next 15th “five-year plan” period (2026-30). The new system should be dominated by renewable energy and respond to risks, such as extreme weather, added the outlet. The NEA confirmed that “speeding up” plans for renewable energy over the next five-year plan period is one of its work priorities for the second half of the year, according to BJX News.

More plans issued as industry and oil set to drop

NEW SYSTEMS: China is aiming to build a “national standardised system for responding to climate change”, covering mitigation and adaptation, reported state news agency Xinhua. In an official Q&A, the Ministry of Ecology and Environment (MEE) said that it led the drafting of the new system, issued jointly with 14 other departments. Separately, the Central Committee of the Communist party of China and the State Council said that China’s market-based approach to environmental issues, such as carbon dioxide (CO2) emissions trading, should be “basically complete” by 2027, reported BJX News. This will include stronger links between the national emissions trading system (ETS) and related markets for “CCERs” and “GECs”, the outlet said. (The steel, cement and aluminium industries are being consulted over joining China’s national emissions trading system, ETS, according to a screenshot of a policy document circulating on social media. The document is not public, but its existence has been confirmed to Carbon Brief by multiple sources.)

INDUSTRY EMISSIONS: Meanwhile, the “national standards for product carbon footprints” for nine products, including electrolytic aluminium, chemical fibres and plastic, have been established, said the People’s Daily. It is estimated that the total carbon dioxide (CO2) emissions from the industry sector could drop to 450m tonnes in 2060, down 95% from 2025, according to a joint report by the Tsinghua University, as well as Energy Foundation China and the Chinese Academy of Environmental Planning – a research institute under the MEE, reported China Science Daily.

FALLING OIL DEMAND: The overall demand for oil is set to decline in China, with the “faster adoption” of “new-energy vehicles” (NEVs) offsetting growth in other areas, reported state-run newspaper China Daily. The outlet added that NEVs and liquefied natural gas (LNG) heavy trucks played a “significant role” in reducing demand for “traditional fuels” in 2024. In addition, strong sales of electric trucks – boosted by government incentives – pushed down demand for diesel, which makes up over a quarter of Chinese oil demand, said Bloomberg. Another article by China Daily said that one incentive – the equipment trade-in policy – motivated more than 4m car trade-in applications between January and May 2025. It said more than half of applications in the first four months of the year were for NEVs. The total production and sales of NEV reached just under 6m units in the first five months of this year, a year-on-year increase of around 45%, reported Xinhua.

Extreme weather events

RAIN AND HEATWAVES: Yunnan province in southeast China was hit by “flash floods and mudslides” triggered by heavy rainfall, affecting around 5,000 residents, reported Reuters. Hunan province in the south also received pouring rain, which “seriously damaged” roads and power facilities, said state broadcaster CCTV. Heatwaves, in the meantime, swept northern China with temperatures in Hebei and Xinjiang province topping 40C, reported China National Emergency Broadcasting Center, a state-run media outlet. People’s Daily reported that the central government had allocated 45m yuan ($6.2m) of “natural disaster relief funds” to support flood control and disaster relief in Yunnan, a landslide in Tibet, and drought relief in Gansu and Ningxia.


11,000,000,000

The capacity of newly approved coal power plants in the first quarter of 2025 in watts – some 11 gigawatts (GW). This is 1GW more than the first six months of last year, according to a report from NGO Greenpeace, covered by Reuters. The newswire added that China had approved 289GW of new coal capacity over 2021-25 and that last year saw the first annual decline in approvals since 2021.


Spotlight

More than 100bn yuan poured into coal via ‘capacity payments’ in 2024

To date, there is no clear evidence that China’s coal “capacity payments” are helping coal-fired power plants to transfer into a “supporting role” with reduced output and emissions, according to a Carbon Brief guest post by Mingxin Zhang, coal researcher at Global Energy Monitor (GEM).

In the first year of the scheme, GEM finds that some 70-100% of China’s coal plants received payments totalling more than 100bn yuan ($14.8bn), boosting their revenues by around 5-8%.

In this issue, Carbon Brief highlights the key findings of the guest post. The full article is available on Carbon Brief’s website.

A ‘supporting’ role for coal

China rolled out a system of “capacity payments” in January 2024, with the aim of maintaining energy security while helping coal-fired power plants shift into a “supporting role”, alongside a growing share of variable renewables.

The mechanism essentially provides a monthly “standby” payment to eligible public coal plants, to help cover fixed operating costs during low production periods and to ensure that they are available to switch on during peak demand periods.

The national framework sets payment levels at either 30% or 50% of a benchmark coal plant’s total fixed costs, which was determined to be 330 yuan ($45.8) per kilowatt (kW).

To illustrate the mechanism’s impact, consider a 600 megawatt (MW) coal plant running at China’s 2024 average rates – operating for 4,628 hours a year and selling electricity at 0.452 yuan ($0.063) per kilowatt-hour (kWh).

If it receives a 30% capacity payment, roughly 59.4m yuan ($8.2m) would be added to its bank account, driving up the revenue by 4.7%. If the rate is at the 50% level, the bump rises to 7.9%.

Project year one

After one year of China’s programme, GEM’s analysis finds that, while the policy has contributed to coal power plant revenue, there is still little definitive evidence to show that it is helping coal plants reduce their operation, as intended.

Only 12 provincial governments – representing 38% of the country’s total operating coal capacity – have released lists of qualifying plants.

Based on the national policy’s payment levels and the 12 provincial recipient lists, the capacity payments in these provinces alone was more than 40bn yuan ($5.5bn).

Combining the total operating capacity and payment numbers from the 12 provinces that have published data with GEM’s most recent national capacity figures, the analysis estimates that the total national payout in 2024 was approximately 107bn yuan ($14.8bn).

(This figure is uncertain. Greater transparency would help clarify how the mechanism is functioning and its role in shaping the future of coal in China’s power system.)

Despite restrictions, most coal capacity is eligible

By cross-referencing provincial recipient lists with GEM’s Global Coal Plant Tracker (GCPT), it is possible to estimate the share of each province’s coal capacity receiving payments.

In almost all of the 12 provinces that published recipient lists, 70-100% of coal capacity is eligible for payments.

The programme said that only “compliant, public operating coal units” are eligible for the capacity payments and excluded three categories:

  1. Captive” units, which exclusively serve specific industrial or commercial entities and operate independently from the public power grid;
  2. Units failing to meet energy efficiency, environmental performance, or operational flexibility standards;
  3. Units not compliant with the broader “national plan”, a criterion that is not further clarified in the guidelines.

In some cases, the scheme as implemented by individual provinces appears inconsistent with the eligibility criteria. For example, the Mancheng Mill power station in Hebei provides heat and power exclusively to a pulp and paper industrial park. This appears inconsistent with the “captive unit” exclusion.

Some newly built coal power plants and decades-old plants were also included. For example, Beihai Bebuwan power station Unit 4 in Guangxi began operating in March 2024 and was added to the recipient list in September 2024. Shenhua Panshan power station Units 1 and 2 in Tianjin began operating in 1994 and were retrofitted in 2023.

Finally, several provincial lists include smaller units, which may have limited ability to contribute to peak demand management. For example, five 57MW units from Shaoxing Binhai power station in Zhejiang were accredited for capacity payments.

Their actual contribution to evening peak load, when generation from solar and wind is low, is unclear from the list or other available provincial assessments.

More questions than answers?

There was only two months between the announcement of coal capacity payments and their implementation, leaving no time for pilot programmes or detailed feedback. This may help explain the ambiguities that have emerged during the provincial execution process.

Our analysis of the first year of the scheme suggests that provincial discretion has played a major role, with national criteria loosely applied in practice.

Moreover, there is no clear evidence to date that the mechanism has led to reduced coal utilisation hours, or significantly increased solar and wind generation.

Watch, read, listen

MINISTER’S COMMENT: Huang Runqiu, head of China’s MEE, penned an article about biodiversity for Qiushi, the Communist party’s leading magazine on ideology.

US NUCLEAR COMPONENT BAN: The Hong Kong-based South China Morning Post published an analysis on China’s nuclear energy against the background of the US’s nuclear power controls.

CARON NEUTRALITY FORUM: A group of prominent Chinese scholars gathered in Shanghai and made speeches about China’s “dual-carbon goals”, according to the official WeChat account of the Research Institute of Carbon Neutrality of the Shanghai Jiao Tong University

EV CCOMPETITION: BBC News international business correspondent Theo Leggett recorded a reading of his analysis of the expansion of Chinese cheap electric vehicles (EVs), as well as security concerns over them.

New science

Embracing the future, powering growth: An energy system renewed for China
Springer Nature

A book jointly written by oil major Shell and the Development Research Center of the State Council of China explored energy transition challenges and pathways in China. At the book’s launch event, attended by Carbon Brief, representatives from both organisations introduced the main arguments in the book, including challenges China faces in reaching its “dual-carbon” goals, its high reliance on coal and regional disparities between renewable energy resources and demands, as well as its commitment to reach carbon neutrality in just 30 years – a shorter timeline than most developed countries. The book outlines three “approaches” and five “supports”, including electrification, better carbon and electricity pricing, legal support and investing in energy storage, as well as other resources, such as hydrogen and nuclear.

A machine learning approach to carbon emissions prediction of the top eleven emitters by 2030 and their prospects for meeting Paris Agreement targets
Scientific Reports

China, India, Japan, Canada, South Korea and Indonesia are projected to miss their 2030 emissions reduction targets by “significant margins”, according to new research. The authors used a machine learning approach to analyse data from 1990-2023 from the 11 highest emitting countries. They found that Russia is on track to exceed its reduction targets, while Germany and the US will “fall slightly short”. Iran and Saudi Arabia are expected to increase emissions rather than reduce them, according to the study. The authors say that “emerging economies require international collaboration and investment to support low-carbon transitions”.

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China Briefing is compiled by Wanyuan Song and Anika Patel. It is edited by Wanyuan Song and Dr Simon Evans. Please send tips and feedback to china@carbonbrief.org

The post China Briefing 12 June 2025: Critical mineral exports; Electricity price; Coal ‘capacity payment’ appeared first on Carbon Brief.

China Briefing 12 June 2025: Critical mineral exports; Electricity price; Coal ‘capacity payment’

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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

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

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

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