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China Briefing handpicks and explains the most important climate and energy stories from China over the past fortnight. Subscribe for free here.
Key developments
Steel, aluminium and cement on notice
ETS EXPANSION: China will expand its emissions trading system (ETS) to include the steel, cement and aluminium industries, which will “require an additional 1,500 firms to purchase credits to cover their emissions”, Reuters reported. (The Ministry of Ecology and Environment proposed the expansion in a draft policy last year. Read Carbon Brief’s in-depth Q&A on the ETS.) The newswire added that the system would now cover 8bn tonnes of carbon dioxide (CO2), or “more than 60% of China’s total emissions”, up from 40% currently. The expansion demonstrates a “strong political will [in China] to achieve the country’s ‘dual-carbon’ goals” despite a tense geopolitical climate and domestic “economic pressures”, the Shanghai-based news outlet Sixth Tone quoted Shen Xinyi, researcher at the Centre for Research on Energy and Clean Air (CREA), as saying. Finance news outlet Yicai said the expansion will “intensify the [steel] sector’s fragmentation and force outdated production capacity to shut”, but in the long term would encourage “technological innovation and investment” in the “green transition”.
‘CLEAN’ ALUMINIUM: Aluminium producers are expected to increase their use of “clean energy” to 30% of their total energy use by 2027 according to a new industry development plan, energy news outlet International Energy Net reported, adding that China also aims to “raise output of recycled aluminium to more than 15m tonnes”. (This would more than double its 2020 output. China’s production of “primary” aluminium made from metal ore is around 44m tonnes per year.) The plan also urges aluminium producers to “participate in renewables projects, such as solar, wind, hydrogen and energy storage”, as well as “engage in green electricity trading, purchase green electricity certificates (GECs)…and [invest] in clean-power projects to increase clean energy use”, according to industry news outlet BJX News. Bloomberg said that the directive – which “mirrors similar guidance…given to copper smelters” – also tightens rules for building new aluminium plants in a “bid to tackle overcapacity”.
GRID INVESTMENT: Meanwhile, investments in China’s electricity grid “jumped by about 33% in the first two months” of 2025 to around 44bn yuan ($6bn), Bloomberg reported, although it noted this was “still below the pace needed” to meet China’s 2025 spending target of 650bn yuan ($89bn). Separately, China has launched 30 projects in nine cities to pilot the use of electric vehicle batteries in supporting the grid, Reuters reported. Elsewhere, China’s finance ministry pledged to provide more financial support in 2025 for meeting China’s climate goals and the promotion of renewable energy and the low-carbon transition of “key industries”, BJX News reported.
Low-carbon leadership

‘COMMANDING HEIGHTS’: China must “aim for the commanding heights of future science, technology and industrial development” in “new energy” and other technological “frontiers”, Chinese president Xi Jinping said in a speech published by Qiushi, the country’s top ideological journal. The speech focused on key tasks for building China’s strength in science and technology, noting: “Green [and] low-carbon technologies have contributed significantly to…a beautiful China.” Xi also raised the importance of “international” cooperation, such as for “jointly respond[ing] to global challenges such as climate change…[and] energy security”.
ASIA’S DAVOS: Meanwhile, China’s climate envoy Liu Zhenmin said at the 2025 Boao forum – an event also known as Asia’s Davos – that the “political will of member nations, market forces and technology” meant that the global energy transition is “irreversible”, Bloomberg reported. State broadcaster CGTN quoted Liu saying at the event, held in Hainan province last week, that one key “challenge” would be delivering the $300bn climate-finance goal agreed at COP29. It quoted him adding: “We need to continue to push developed country parties to undertake their responsibility for this payment.” Liu also said a “friendly trade environment and a favorable market environment” is needed for low-carbon technologies to “flow freely” around the world, the Communist party-affiliated People’s Daily reported. Executive vice-premier Ding Xuexiang called on countries to “firmly oppose trade and investment protectionism” in his keynote speech at the event, Bloomberg said. (Ding is China’s “top decision-maker” on climate policy.)
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TÊTE-À-TÊTE: Elsewhere, China and France “issued a joint statement on climate change…marking the 10th anniversary of the Paris Agreement”, the state-run newspaper China Daily said, in which the nations “reaffirmed their shared commitment to enhancing international cooperation to address climate challenges”. CGTN published the full text of the statement, in which China and France pledged “enhanced communication about their respective upcoming new ambitious [nationally determined contributions] which will cover all economic areas and greenhouse gases, and be aligned with the Paris Agreement goals”. The statement also pledged “continuous efforts to transition away from fossil fuels”. The two countries separately agreed to cooperate on “nuclear energy”, “connected vehicles” and “green hydrogen”, the Singapore-based Straits Times said.
GREEN FINANCE: China has launched a 6bn yuan ($825m) green sovereign bond on the London Stock Exchange in “what is expected to be the first in a series of sales that will expand its footprint in the market”, Reuters reported. Bloomberg said it “highlight[ed China’s] ambitions to bolster its environmental credentials to investors”. (The plan to issue the bond was first announced during Rachel Reeves’ visit to Beijing in January).
Record trade tensions
‘LIBERATION DAY’: The US imposed a new total tariff rate of at least 54% on goods from China, in a move that could encourage China to “branch out and find new markets for its clean-energy technology, accelerating their adoption”, the Scientific American said. (Chinese exports of clean-energy technologies to the US were already low due to existing tariffs.) Politico reported that, as “a lot of” the basic materials for electric vehicle (EV) batteries are sourced from China, US EV manufacturers will be “hit” by the tariffs. Ahead of the announcement, a report on “foreign trade barriers” from the US government dedicated almost 50 of its 400-pages to China, criticising China’s aim to “dominat[e]” industries such as “new energy vehicles”, the New York Times reported. China “firmly opposes” the tariffs, Reuters quoted China’s commerce ministry as saying. (Read Carbon Brief’s article for expert views on the climate impacts of Trump’s tariffs)
EU-CHINA TALKS: China and the EU confirmed that they “agreed to restart talks on minimum [import] price[s]” for Chinese EVs “as soon as possible”, according to Reuters. While Chinese battery EV exports to the EU have “slowed” due to EU tariffs, China’s “exports of plug-in hybrid electric vehicles” – which are not subject to tariffs – “surged” in January and February 2025, the Hong Kong-based South China Morning Post said. Reuters said China “has not shipped any antimony”, a critical mineral used in solar-panel manufacturing, to the EU since it was placed under export controls in October. Meanwhile, Japan placed a 95% anti-dumping duty on imports of Chinese graphite electrodes, which are used in technologies such as electric arc furnace steelmaking and lithium-ion batteries, another Reuters article reported.
TRADE INVESTIGATIONS: China was the subject of a “record number of trade investigations by [World Trade Organization] members last year”, triggered by a boom in exports, the Financial Times reported. It said the 198 trade investigations in 2024 “alleging dumping or illegal subsidies” was double the previous year’s total.
Pricing reform
HIGH-LEVEL OPINIONS: The top offices of the Chinese Communist Party and State Council issued joint opinions on the need to improve pricing mechanisms, which reiterated calls for “market-oriented reform of prices” for energy, reform of feed-in tariffs – which have been used to set prices for coal and renewables – and improving power purchasing systems, Xinhua reported. The document also called for the establishment of “sound” pricing mechanisms for gas, energy storage and other energy flexibility providers, which could indicate plans for “further rolling out capacity mechanisms” to cover further power generation sources in addition to coal, wrote Yan Qin, principal analyst at ClearBlue Markets, on LinkedIn.
OPTIMISING RESOURCES: A representative of the National Development and Reform Commission (NDRC), China’s top economic planner, told business newspaper Daily Economic News that improved pricing mechanisms are the foundation of a better market-oriented economy. The outlet also quoted Lin Weibin, director of the energy policy research office of the China Energy Research Society, saying that an important element of improving pricing mechanisms is to “accelerate the construction of the electricity spot market, and promote the construction of a unified national electricity market”. The opinions are a “powerful impetus” to develop systems that make the use of “energy resources” more efficient and optimise China’s energy structure, Xinhua quoted Deng Yusong, a researcher at the government-backed thinktank Development Research Center of the State Council, as saying.
Spotlight
Guest post: China’s surging solar exports to the global south
China’s exports of solar panels to the global south have doubled in the past two years, overtaking global-north sales for the first time since 2018, says a recent Carbon Brief guest post.
The guest post is by Dave Jones and Libby Copsey, respectively global insights programme director and data developer at thinktank Ember. Ember’s China solar PV export explorer tracks shipments to more than 200 countries, showing that global south countries, such as Brazil, Saudi Arabia, Pakistan and India, were among the top importers of Chinese solar panels in 2024.
In this issue, Carbon Brief highlights the key findings of the guest post. The full article is available on Carbon Brief’s website.
Top importers
China’s solar panel exports rose by 10% in 2024, with imports by global-south countries rising by 32% and those to the global north falling by 6%, according to Ember’s data.
Global-south imports more than doubled from 60 gigawatts (GW) in 2022 to 126GW in 2024. That surpassed global-north imports, which were only 12% more in 2024 than in 2022, as shown on the chart below.

The Netherlands was the biggest importer in 2024 and has been every year since 2019, as a result of Rotterdam serving as an import hub for much of continental Europe. The next four places were all global-south countries.
Brazil was in second place, importing more than 20GW for the second year in a row. However, the imposition of import taxes by the government, the refusal of electricity distributors to connect new solar systems and solar “curtailment” are all causing headwinds in 2025.
Pakistan and Saudi Arabia jumped to third and fourth, respectively. These two countries have had almost identical imports of Chinese solar panels for the past two years. They stood at 8GW in 2023 and then more than doubled to 17GW in 2024, the export explorer shows.
However, Pakistan has mainly imported panels for small-scale “distributed” installations. In contrast, Saudi Arabia’s import growth has been driven almost entirely by desert solar parks, complete with some battery storage and paid for by international energy companies.
India was in fifth place in 2024. Its module imports remained similar to those in 2023, but its installations rose to a record high, enabled by a step up in new domestic solar panel manufacturing capacity.
In January 2025, that helped India hit 100GW of solar installed, according to government figures. India is partly relying on Chinese imports, whilst simultaneously scaling up its own manufacturing industry.
New markets
There were 15 countries that saw a large uptick in imports of Chinese solar panels towards the end of 2024.
In particular, there were large increases in Nigeria, Algeria and Iraq, where there is clear evidence that demand for panels is growing.
Nigeria’s growth was driven by blackouts in 2024 and the removal of fuel subsidies, Iraq is constructing its first large solar plant, while Algeria has a plan for 3GW of solar projects.
For a cluster of a further 12 countries, which includes many small African and Latin American countries, it is less clear if the recent uptick in solar panel imports is a structural change that will continue into 2025 and beyond.
There are large incentives for China’s solar manufacturing companies to meet year-end targets, so it is possible that containers of solar panels were sold to these countries at discounted rates to help meet these goals.
The recent spike in imports are nevertheless quite large in the context of the small electricity systems of many of these countries. As such, these solar panels would provide a relatively meaningful increase in renewable electricity generation if they go on to be installed.
Reducing reliance
China itself – the biggest of all the global-south solar markets – installed more solar panels than it exported for the second year in a row.
It installed 333GW of solar capacity domestically in 2024, some 38% more than the 242GW of solar panels that it exported.
Solar exports rose by 10% year-on-year, which was a significant slowdown from the rate of growth seen in recent years. However, solar installations outside of China grew by 30%.
This demonstrates a step-up in ambitions to reduce reliance on Chinese solar panel imports by a number of countries around the world.
Watch, read, listen
SHIFTING MINDSETS: Business news outlet Jiemian interviewed the owner of a struggling clean-energy technology distributor in Germany about the challenges of importing Chinese energy products to the EU.
PATIENT CAPITAL?: New Security Beat explored how China is using “resource-backed loans” as part of its overseas development finance strategy, recouping loan payments in the form of oil, minerals and other national resources.
NO MORE BF-BOF: A new report by consultancy Global Efficiency Intelligence examined how China can increase uptake of electric arc furnaces in its carbon-intensive steel industry.
PLOTTING THE FUTURE: Kaare Sandholt, chief international advisor at the Energy Research Institute, spoke with Environment China about the thinktank’s modelling of China’s energy transition, which he recently wrote about for Carbon Brief.
26%
The amount by which China’s glacier area has shrunk since 1960, due to rapid global warming, Reuters reported. The newswire added that 7,000 small glaciers have disappeared completely in China during this period.
New science
npj Climate Action
A new study analysing China’s climate policy found that a higher “density”, or number, of climate policies “does not equate to stronger [climate] action”. The authors created a dataset of 358 climate-related policies adopted by China’s central government from 2016-22. They found “significant variation” in how much different sectors were aligned with China’s most recent nationally determined contribution (NDC) – especially among high-emitting sectors.
Communications Earth & Environment
An emissions trading system (ETS) is needed in order for ammonia produced with renewable energy – known as “renewable ammonia” – to achieve “cost parity” with conventional ammonia before 2040, according to new research. The authors used models to project the economic and carbon costs of seven ammonia production technologies, evaluating the impact of China’s ETS on the levelised cost of ammonia over 2018-60. Expanding the ETS to cover the lifecycle of ammonia production could allow “renewable ammonia” to achieve cost parity 6-37 years sooner than if the system was not implemented, it added.
China’s carbon sinks from land-use change underestimated
Nature Climate Change
A new study found that China’s carbon sinks resulting from land-use change over the past four decades have been underestimated. The study analysed carbon fluxes linked to land-use change between 1981-2020, using independent models and a new dataset integrating remote sensing with China’s national forest inventory. It added that, over the past 40 years, China’s net carbon flux from land-use change removed 7.3bn tonnes of CO2, with the annual average sink since 2001 totalling 0.5bn tonnes of CO2.
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 3 April 2025: Solar exports; Carbon market expansion; Leaders’ climate commitments appeared first on Carbon Brief.
China Briefing 3 April 2025: Solar exports; Carbon market expansion; Leaders’ climate commitments
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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Guest post: Why China is still building new coal – and when it might stop
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Climate Change2 years ago嘉宾来稿:满足中国增长的用电需求 光伏加储能“比新建煤电更实惠”
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Climate Change2 years ago
Bill Discounting Climate Change in Florida’s Energy Policy Awaits DeSantis’ Approval
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Renewable Energy10 months agoSending Progressive Philanthropist George Soros to Prison?
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Greenhouse Gases1 year ago
嘉宾来稿:探究火山喷发如何影响气候预测
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Carbon Footprint2 years agoUS SEC’s Climate Disclosure Rules Spur Renewed Interest in Carbon Credits


