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Key developments
China’s next ‘five-year plan’
NEW PLAN: The Chinese Communist party held its fourth plenum meeting, reported the Guardian, which described it as a “key meeting in the country’s political cycle and a crucial one in the development of its 15th ‘five-year plan’”. China’s “five-year plans” serve as blueprints guiding the country’s economic and social development. The 15th one runs from 2026-30. While the plan will not be released until next year, the full text of the official “adopting recommendations” said a “main target” will be making “major new progress in building a beautiful China”. This includes a “green production and lifestyle to be basically established [and] the carbon-peak target [for 2030] to be achieved as scheduled”, according to the text.
TECHNOLOGY AND ‘INVOLUTION’: The Guardian’s report highlighted the “recommendations” for technology investments and a “crackdown on ‘involution’” – a reference to “fierce internal competition” that has, in the past, led to oversupply. In a “15th ‘five-year plan’ explanation” speech, Chinese president Xi Jinping said “it should be noted that the development of new quality productive forces”, which largely relies on technology, requires “full consideration of practical feasibility”, according to the transcript published by state news agency Xinhua. He also called on local officials to avoid a “rush” to develop projects, when talking about using technological innovation for “promoting a comprehensive green transformation”.
‘GREEN’ TRANSITION: At a post-meeting press conference, Zheng Shanjie, head of the National Development and Reform Commission (NDRC), said the “comprehensive realisation of green transformation” requires the construction and implementation of the “dual control of carbon” system and the “green and low-carbon” transition of energy, as well as “industrial structure” and “production and lifestyle”. The National Energy Administration (NEA) also pledged to “focus on” building a “clean, low-carbon, safe and efficient new energy system” at a separate meeting, reported industry news outlet BJX News. Belinda Schäpe, China policy analyst from the Centre for Research on Energy and Clean Air (CREA), commented on LinkedIn that the commitment to build the “dual control of carbon” was “expected”. She added that the “reaffirmation” of renewable expansion was an “important signal given the uncertainty of the sector’s future after the policy pricing reform” came into force earlier this year.

EXPERT REACTION: Schäpe called the mention of “[promoting the] peaking [of] coal and oil consumption” an “important signal”, as this is the first time “such language appears in a top-level planning document”. The oil-peak target “aligns with international expectations” and the “references to ‘clean and efficient use’ and ‘orderly replacement’ suggest a managed transformation of coal’s role – focusing on retrofits, flexibility and system support rather than new capacity growth”, she added. This suggestion of a peaking for coal and oil “allows” coal consumption to “increase in the early years of the five-year period”, according to a LinkedIn post by Lauri Myllyvirta, lead analyst from CREA. He said the peaking suggestion, although “in line with the goal of peaking [carbon dioxide] CO2 emissions before 2030”, provides “no guarantees of achieving a [CO2] reduction from 2025 to 2030, let alone starting from 2025”. The “most important question” for the next “five-year plan”, he added, is “whether China is committed to honouring the 2021 commitments: reducing carbon intensity by 65% from 2005 to 2030 and ‘gradually reducing coal consumption’” over the next five years.
Pre-COP30 report
CLIMATE REPORT: The Chinese Ministry of Ecology and Environment (MEE) released an annual report on “China’s policies and actions on climate change 2025” ahead of COP30, reported the Chinese media outlet 21st Century Business Herald. The newspaper quoted Xia Yingxian, director of the MEE’s department of climate change, saying the report “showcased” China’s “significant contributions to mitigation, adaptation, carbon markets, carbon footprint, climate policies and regulations and leading global climate governance”.
GLOBAL COOPERATION: The Paper, a Shanghai-based media outlet, reported that Xia said China “follows through” on its global climate cooperation commitments. Speaking about the 10th anniversary of the Paris Agreement, Chinese foreign minister Wang Yi said climate change has become an “urgent issue” and – in an apparent reference to the US – added that no country can “be a deserter”, according to a video posted by China News. Vice premier Ding Xuexiang also “said that China stands ready to work with all parties to advance global green development”, reported Xinhua. China’s stance on global climate cooperation was reiterated at a G20 environmental meeting in South Africa, according to International Energy Net.
China-EU climate cooperation
FINANCE: The 21st Century Business Herald wrote that the MEE’s report indicated COP30 should make “positive progress” in meeting the financial targets agreed at COP29 – the “aspirational” target of $1.3tn a year and at least $300bn of climate finance a year by 2035. Xia said the $300bn pledge did not “fully reflect” the “capital contribution obligations of developed countries”, added the outlet. Meanwhile, the EU’s climate chief Wopke Hoekstra asked China to boost its climate-finance offering, reported European news website Euractiv. He said “China is an upper middle income country” and “Europe just simply does not have the pockets” to provide all the needed climate finance “by itself”, according to the outlet.
CLIMATE TIES: In a press release following a recent meeting between Chinese premier Li Qiang and European Council president António Costa, Costa was quoted saying that “climate action has to remain [at the] top of our agendas” and that COP30 will “offer an opportunity for the EU and China to lead with ambition in order to achieve a successful outcome”. The Hong Kong-based South China Morning Post said Li also expressed Beijing’s willingness to work with the EU on matters including “the environment”. Costa added that “I shared my strong concern about China’s expanding export controls on critical raw materials”, urging Li to “restore as soon as possible fluid, reliable and predictable supply chains”, according to the press release.
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EXPORT CONTROLS: The trade dispute over China’s supply of rare earths was “settled” during a meeting between US president Donald Trump and his counterpart Xi in South Korea earlier today, reported the Guardian. Reuters said China agreed to delay the introduction of the next round of export controls, but that earlier restrictions on critical minerals will remain. The rare-earth minerals “play tiny, but vital roles” in products such as cars, planes and weapons, the newswire added. The US will also lower tariffs on some Chinese imports, according to ABC News.
More wind, less coal
COAL DECLINE: Official data showed that China’s thermal power generation – mainly from coal – dropped 5.4% in September, reported Bloomberg. Meanwhile, the Ministry of Industry and Information Technology is consulting on its new steel capacity “swap” policy that aims to “promote market supply and demand balance”. Reuters said this was a “more stringent” swapping plan than the previous one that has been paused for 14 months. Shen Xinyi, researcher from CREA, explained on LinkedIn that the new programme “raises the replacement ratio to 1.5:1 nationwide” and encourages cross-regional swaps. She added the measures “signal a deeper shift: from expansion control to structural optimisation and decarbonisation”, calling it a “strategic move to restructure and rebalance China’s steel landscape”.
MORE WIND: A new industry proposal, the “Beijing Declaration on Wind Energy 2.0”, put forward a goal for the country’s wind capacity to reach “1.3 terawatts (TW) by 2030, at least 2TW by 2035 and a staggering 5TW by 2060”, said state-run newspaper China Daily. The outlet called the new plan a “significant increase” from an earlier declaration, which had targeted 3TW by 2060. The same group of wind-industry players are “lobbying the government to install at least 120 gigawatts (GW) of wind-power capacity in each of the next five years, an acceleration of the country’s energy transition that would more than double output by the end of the decade”, reported Bloomberg. The official goal is to install 3.6TW of capacity for wind and solar power combined by 2035, added the outlet.
OVERSEAS EXPANSION: After two years of talk with the UK government, Chinese wind turbine manufacturer Ming Yang announced that it wants to build a £1.5bn project in Scotland, said BBC News. European governments, however, were “increasingly wary of Chinese companies’ involvement” in offshore wind, which is a “cornerstone of northern Europe’s clean-energy strategy”, reported Reuters. Exports of China’s other renewable energy products, namely, the “new three” – lithium-ion batteries, solar cells and electric vehicles (EVs) – rose nearly 40% year-on-year in September, according to official data, reported financial outlet Caixin. Separately, China “sent a clear signal that it is willing to pull the plug on subsidies” for the EV industry, said Reuters.
Spotlight
Q&A: How China is developing ‘vehicle-to-grid’ to strengthen its electricity system
China’s surging electric vehicles (EVs) ownership – now exceeding 25.5m – is opening the door to a new technology that turns EVs into “power banks” to help with the flexibility of electricity supply.
Carbon Brief looks into the technology, known as “vehicle-to-grid” (V2G), and explains how it has sparked interest in China. The full article is available on Carbon Brief’s website.
How can V2G help balance the grid?
In China, EVs with bidirectional batteries, when plugged into V2G-capable charging stations, are able to sell their stored electricity back to the grid in nine “pilot cities”, including Shanghai, Guangzhou and Shenzhen.
Dr Muyi Yang, senior electricity analyst at thinktank Ember, told Carbon Brief that a fleet of grid-connected EVs could help China achieve its broader plan to restructure its power sector towards a “new power system” that aims to be more flexible and responsive to power volatility.
Zhou Xiaohang, China clean-power project manager at the US-registered Natural Resource Defense Council in Beijing, told Carbon Brief that, in the long run, V2G can help to address the curtailment issue for renewable energy, which is often referred to as the “Xiaona” problem in China.
What is the current state of V2G adoption?
Currently, V2G has not been widely deployed in China. The cost of V2G infrastructure installation remains high.
Zhou said the success of large-scale roll out of V2G depends on whether there are enough EVs equipped with the bidirectional batteries and able to be plugged into V2G-capable charging stations.
China “already [has] enough EVs on the road to make [V2G] possible”, she added.
Meanwhile, popular car brands such as BYD and Nio have released new EV models with V2G features and many more are actively testing and preparing for two-way electric charging.
There are 30 demonstration projects going on at the moment. Shenzhen, for example, received more than 70,000 kilowatt hours (kWh) of electricity from about 2,500 EVs in June.
Regional governments have also been working to introduce more profitable pricing systems to boost user participation.
Guangdong province, in south China, launched a V2G pricing plan that is “appealing” enough for EV owners to see a profit from participating in the scheme, according to Zhou.
What are the challenges in expansion?
A large share of China’s electricity is still traded through long-term power contracts, which could limit incentives for individual EV owners to engage in power-trading.
Shen Xinyi, researcher at Centre for Research on Energy and Clean Air (CREA), told Carbon Brief:
“Flexible systems like V2G and distributed solar power need a well-developed spot market and experienced, professional players such as power retailers to truly thrive.”
Zhou said whether V2G can be rolled out at scale also depends on the attitudes of consumers.
Chinese media outlet the Paper reported that people had expressed concerns on battery health and safety issues, including whether frequent discharges could cause battery degradation.
In April 2024, Hui Dong, chief technical expert at the China Electric Power Research Institute, a research institute affiliated to the State Grid Corporation of China, stated that, in terms of lifespan, chemical energy storage systems, represented by lithium-ion batteries, are still “underperforming”.
Watch, read, listen
CARBON REDUCTION: Prof Jiang Yi, director of building energy research centre at Tsinghua University, explained how to “reduce carbon” on both “the side of production” and “the side of consumption” in an interview with financial outlet Yicai.
INDONESIA’S JOURNEY: The China Global South Project aired a podcast on China’s role in “Indonesia’s push for clean energy and more coal”.
CLIMATE STATEMENTS: China Daily published a list of climate statements from prominent Chinese politicians and researchers, including Liu Zhenmin, China special envoy for climate change.
ENERGY CHALLENAGES: In a long interview with 21st Century Business Herald, Energy Foundation China president Zou Ji said “grid integration challenges” are the most “immediate obstacle” to China’s clean-energy buildout.
5tn
The growth in “added value” – a component of economic output – of China’s “green industries” from 2020-25, in Chinese yuan ($700bn), according to 21st Century Business Herald. The newspaper quoted Ren Yong, chief engineer at the Ministry of Ecology and Environment, saying that the “added value of green and low-carbon sectors in key industries” accounted for 8.3% of GDP in 2020 and is expected to rise to 11.7% in 2025, according to the newspaper. [Previous analysis for Carbon Brief found clean-energy industries accounted for 10% of China’s GDP in 2024.]
New science
Ecology and Society
New research examined different approaches to assessing the vulnerability of fisheries to climate impacts, finding that using a data-driven approach can result in differing vulnerability than using a “knowledge-driven” one. The authors wrote that their results underline the “importance of engaging local knowledge to validate findings and provide contextualised interpretations for more effective management strategies”.
Mechanisms behind the rapid rise of extreme heat discomfort days in south China
Npj climate and atmospheric science
The number and strength of extreme heat discomfort days in south China has undergone a “sharp rise” since 2000, according to a new study. Researchers used observational weather data and a machine-learning model to determine the atmospheric circulation patterns that cause the extreme events. They found that an area of high pressure over the Pacific Ocean weakened the summer monsoon winds.
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 30 October 2025: 15th ‘five-year plan’ priorities; 2035 wind goal; ‘Vehicle-to-grid’ tech 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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