Welcome to Carbon Brief’s China Briefing.
Carbon Brief handpicks and explains the most important climate and energy stories from China over the past fortnight. Subscribe for free here.
Key developments
China to achieve emission peak, carbon neutrality ‘ahead of its deadline’
ENERGY OPTIMISM: China’s post-Covid economic “situation” has led to “growing optimism” among energy experts that the country could peak carbon emissions earlier than its deadline of 2030, said the South China Morning Post, citing the second China Climate Transition Outlook survey by the Centre for Research on Energy and Clean Air (CREA) and the International Society for Energy Transition Studies. More than 70% of experts in the survey believe that China can achieve its goal of peak carbon emissions before 2030, while just over a fifth believe China could peak emissions before 2025, compared with 15% in the 2022 survey, reported the state-run newspaper China Daily. It also mentioned that experts had “mixed views” on when the country would witness a peak in coal consumption. Economic news outlet Jiemian quoted Shen Xinyi, a policy analyst with CREA, saying that coal power plants in China were seeing a “boom” because of power shortages in the past two years and the government needs to guide existing coal power plants to improve their operational flexibility. (See Carbon Brief’s newly published in-depth profile of China, which covers a wide range of topics including: climate laws; policies for fossil fuels, renewables, hydro and nuclear; transport; agriculture and forests; plus climate impacts and adaptation.)
EARLY NEUTRALITY: China’s target of net-zero by 2060 is “likely to be achieved” a decade earlier than previously assumed, wrote Ambrose Evans-Pritchard, world economy editor of the UK’s Daily Telegraph. He quoted Lauri Myllyvirta, co-founder, CREA, saying that the roll-out of renewables is outpacing the rise in electricity demand in China and there will be a fall in total carbon dioxide emitted in the first half of next year. (The piece draws heavily on Myllyvirta’s recent analysis for Carbon Brief.) Evans-Pritchard said that China approving two new coal plants a week does not mean what many in the West think it means. China is adding one gigawatt (GW) of coal power, on average, as back-up for every six GW of new renewable power, he said: “The two go hand in hand.” Although president Xi Jinping “was never going to let climate worries alone hold back China’s rise”, he concluded, the alignment of Xi’s personal interest in environmental policy with China’s strength in “clean-tech” industries drove China’s commitment to peaking carbon emissions, which will be “a watershed moment for global geopolitics, and for humanity”.
More signals emerge around CCER restart
CCER RESTART: Energy news outlet IN-EN.com reported that Lai Xiaoming, chairman of the Shanghai Environmental Energy Exchange, remarked in a speech that the China Certified Emissions Reduction (CCER) voluntary carbon market scheme will restart “soon”. According to the outlet, he added that the new CCERs will “follow the three principles of authenticity, uniqueness and additionality”. Earlier this month, the central government released the trial registration rules and the project design and implementation guidelines for CCERs, two key documents that could signal the imminent resumption of trading, energy news outlet BJX News said. The central government continues to back the Beijing Green Exchange as a key administrative body in the carbon market, calling for the ministry of commerce and Beijing municipal government to support it in “build[ing] a national unified greenhouse gas voluntary emission reduction trading centre”, another BJX News piece reported.
CBAM PREPARATION: As China continues to eye the impact of the EU’s carbon border adjustment mechanism (CBAM), it has pledged to establish carbon-footprint accounting rules and standards for 50 key products by 2025, finance newswire Wall Street CN reported. This will be expanded to 200 products by 2030, it added. Regulators will “initially focus on developing standards for cement, iron and steel, aluminium and fertilisers” in order to meet CBAM requirements, analysis by consulting firm Trivium China explained. “China-EU trade will be substantially affected” by CBAM, a representative of the National Energy Group wrote for BJX News. As far as China is concerned, he argued, “the introduction of the EU carbon tariff system will directly affect the ability of Chinese companies to make profits, survive and develop, and also have a substantial impact on China’s import and export trade and production structures”. Days before the opening of the COP28 climate talks in Dubai, UAE, the BASIC group of countries, including China, tabled a request to put “unilateral trade measures” – such as the CBAM – on the official agenda. Carbon Brief understands this and other additions to the agenda will not be officially adopted, but will be taken up elsewhere.
OFFSET CONTROVERSY: A new report by Greenpeace revealed that 85% of all “carbon-neutral LNG [liquified natural gas]” cargoes have been sold to buyers in Asia. There are concerns around the transparency of the forestry offsets used to certify “carbon neutral” LNG, Greenpeace added, especially in terms of “impermanence, baseline, additionality and double-counting”. In a statement, Greenpeace East Asia project leader Li Jiatong said “carbon offsets are a smoke screen to obscure their continued, redoubled carbon emissions. And China is emerging as a major marketplace for such credits.”
Xi: Sustainable development is ‘golden key’ to tackle climate change
‘GOLDEN KEY’: Chinese president Xi Jinping said “sustainable development” is the “golden key” to fixing current global problems on 16 November, during the APEC meeting in San Francisco, the state news agency Xinhua reported. Xi proposed accelerated implementation of the UN 2030 agenda for sustainable development, joint multilateral action to “promote carbon reduction, pollution reduction, green expansion and growth in a coordinated manner” and building global synergy to address climate change, the news agency added. A separate Xinhua article published a speech delivered by Xi shortly before the summit, in which he said “construction of an ecological civilisation requires skilful navigation of various key relationships”, including the balance between “development and protection”. His speech also stressed China’s commitment to its “dual carbon” goals are “unwavering”, but the path and pace of achieving them must be determined by China alone.
CORRECT UNDERSTANDING: Elsewhere, the Communist party-affiliated newspaper People’s Daily published a commentary by “Zhongsheng” – a collective pseudonym that signals the approval of top party leadership – saying that, during the Xi-Biden meeting, Xi highlighted that “it is in the interests of both countries and the expectation of the international community that China-US relations should stabilise and improve”, but that “suppressing China’s science and technology means curbing China’s high-quality development and depriving the Chinese people of their right to development, which China will never agree to and will never succeed”.
Spotlight
What China climate experts expect at COP28
At the opening of the China pavilion at COP28, ministry of ecology and environment head Huang Runqiu said he hopes that COP28 will “fully respond to the demands of developing countries”, while climate envoy Xie Zhenhua said that China is “ready to continue to work with all parties to…send a positive signal…in this crucial decade”.
With a “vanishingly small” remaining carbon budget meaning there is only a “14% chance” of keeping global warming below 1.5C under current pledges, there are high expectations and many unanswered questions as COP28 opens. Chief among these are what the outcomes of the global stocktake will be, who will contribute to the loss and damage fund and what language around fossil fuels will look like.
At COP27, China was seen as engaged and “genial” in public forums, but “stuck to its familiar positions” in formal negotiations. This year, the recent US-China climate agreement may create greater space for a global consensus at COP, but, in many cases, the two superpowers may be on “opposite sides of the negotiating table”.
As delegates flood into Dubai for the conference, Carbon Brief asks leading experts what they expect from COP – and what China’s role will be. Their responses have been edited for clarity and length.
Li Shuo, director of the China Climate Hub at the Asia Society Policy Institute:
China will be under the spotlight at COP28, as in previous COPs. The meeting’s main tasks – the first global stocktake, a robust energy transition package including the need to move away from fossil fuel and support to vulnerable countries for their losses and damages – all require active Chinese contribution.
The recent stabilisation of the US-China relationship provides necessary, but insufficient, conditions for success at COP28. Dubai remains a test on China’s climate appetite in light of its domestic and international challenges. Political signals from COP28 will also play a critical role for China’s domestic climate agenda and will shape Beijing’s decisions in 2024 on a number of key issues including its 2035 NDC (nationally determined contribution, or climate pledge), its role in providing financial support to the global south and its direction on coal consumption.
Lauri Myllyvirta, lead analyst at the Centre for Research on Energy and Clean Air:
The potentially most impactful agreement that could come from COP28 is a target to triple renewable energy capacity globally from 2022 to 2030, which would put the power sector on track to the emission reductions required to meet the goals of the Paris Agreement. This is a target that China should be able to support and even agree to contribute to financing…China has supported the creation of the loss and damage fund and even said it would be willing to contribute on a voluntary basis.
It’s unlikely that China would commit to any specific targets for 2035 right now, but at least an indication that there will be an absolute emission reduction target for 2035 would be a step forward. So far, China has refused to set absolute emission targets, sticking with CO2 intensity targets that are designed to allow emissions to rise.
Symbolically, agreeing to “phase down” or “phase out” unabated fossil fuels could be an important outcome. China already accepted the language to “phase down” coal at Glasgow in 2021 and, given that oil and gas are less important for China than coal, agreeing on the same language on all fossil fuels should not be too hard. However, a phase-out, especially with a deadline such as 2050, might be more than China’s leaders are willing to agree on.
Bernice Lee, Hoffmann distinguished fellow for sustainability at Chatham House:
First of all, China does not want to be blamed as a blocker of multilateral progress, a lesson it has learned from Copenhagen [in 2009]. Second, it will likely emphasise its achievements in renewable energy and electric vehicle production, investments and deployment, as well as its role in cost reduction of these much-needed products in a low-carbon economy. In general, [China will place] an emphasis on implementation of current goals rather than [further] target-setting. It will also likely join forces with poor countries in asking developed economies to deliver the billions needed for climate finance.
Dr Fang Li, China country director at the World Resources Institute:
Alarm bells are ringing, as the window to secure a livable future is rapidly closing. Countries, cities, businesses and financial institutions must urgently get on a new path, transitioning away from systems that exploit people and nature toward those where people’s essential needs are met, land is managed sustainably and emissions are sharply reduced.
COP28 is not just about carbon, it is also about nature, about livelihood, etc. Solutions are not solely based in specific countries or regions. We hope COP28 can be a place that motivates and accelerates more inspiring, ambitious and practical collaborations. As one of the biggest emitters, China is also trying to be one of the biggest contributors to the sustainable future. We’ve observed many positive actions and signals, including on reducing non-CO2 emissions, accelerating food sustainable transition, engaging more resources from private sectors, greening global value chain, strengthening climate actions at subnational levels, etc. We hope to see further discussions and actions from China and other parties during and after the conference.
Watch, read, listen
CLIMATE POLITICS: Prof Brian Wong and Kevin Zongzhe Li argued in China-US Focus that the US and China must consider ASEAN as a partner in developing climate policy and not as “just another battleground”.
FROM THE ROOFTOPS: An article in Nature explored the development of distributed solar in China, which is allowing the government to “vigorously develop renewable energy”.
COP28 CHATTER: The Oxford Institute for Energy Studies discussed the key themes that will dominate conversations at COP28 and China’s position on many of these issues.
REUSING WASTE: The South China Morning Post reported how one company is turning leftover hotpot oil in the city of Chengdu – which can total 150,000 tonnes annually – into jet fuel.
New science
Public discourses and government interventions behind China’s ambitious carbon neutrality goal
Nature Communications Earth & Environment
A new study examines the public discourses around China’s climate goals of peaking carbon emissions by 2030 and achieving carbon neutrality by 2060, and how they might have been influenced by the Chinese government. Through analysis of approximately one million microblogs from China, the researchers find seven types of climate discourses emerging, including scientific, moral, economic, co-benefit, energy security, political and global frames. They also reveal that there is generally a high level of support towards China’s carbon neutrality goal.
Assessing the effectiveness of emissions trading schemes: evidence from China
Climate Policy
New analysis explored the effect of low carbon prices in China’s emissions trading system (ETS) on the country’s ability to reduce carbon dioxide (CO2) emissions, while maintaining economic growth. The results indicate that an increase of $1 in the carbon price would reduce CO2 emissions by 1.69% and increase per-capita GDP by $286. The study found that these benefits were brought about by technological innovation, foreign direct investment and improvements to the energy mix and industrial structure. Carbon leakage to neighbouring regions was not evident, it added.
Storyline attribution of human influence on a record-breaking spatially compounding flood-heat event
Science Advances
New research conducted a storyline attribution analysis to discover possible causes of the 2020 record-breaking spatially compounding flood-heat event in China. The researchers found that there could be a further intensification of compound events by the end of this century, with moderate emissions making the rainfall totals approximately 14% larger and the season approximately 2.1C warmer in south China compared to 2020.
China Briefing is compiled by Anika Patel and edited by Wanyuan Song and Simon Evans. Please send tips and feedback to china@carbonbrief.org.
The post China Briefing 30 November: China at COP28; Xi’s ‘unwavering’ climate commitment; Voluntary carbon market restart appeared first on Carbon Brief.
Climate Change
Pawa in Palau
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.”
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.

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.

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.

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.

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!
Climate Change
From firefighting to future-proofing: Preventing wildfires must be the priority
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.


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.


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