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Located in the heart of the Amazon, it has been billed as Brazil’s first sustainable aviation fuel (SAF) project, but the palm oil producer behind a planned biorefinery in Manaus is now grappling with a financial crisis triggered by concern over possible rights abuses.

Reporting in the region by Brazilian news outlet InfoAmazonia in partnership with Climate Home News, has also found that the company – São Paulo-based Brasil BioFuels (Grupo BBF) – is growing oil palm on three areas subject to sanctions by Brazil’s Ibama environmental agency over illegal deforestation.

The embargoed plots lie in São João da Baliza, a sparsely populated district strung along the highway where former grazing pasture and biodiversity-rich scrubland have steadily been replaced by neat rows of oil palms. Signs hanging on fences say the crop will be used to make SAF.

Aviation’s Green Dream: Read our investigative series on Sustainable Aviation Fuel

While many locals living in the district’s towns welcome the jobs and economic boost provided by BBF’s palm plantations, Indigenous people and environmentalists see them as a threat to nature, traditional ways of life and the rainforest.

“If these areas are completely replaced by crops for biofuel production, we will lose unique species, many of which are still little known to science,” said Lucas Ferrante, a researcher from the zoology postgraduate programme at the Federal University of Amazonas (UFAM).

BBF, which announced its plans for the Manaus SAF project back in 2022, makes much of the fact that – in line with Brazil’s strict environmental laws – it only grows oil palm on land that was degraded before 2007, rather than freshly deforested land.

Stressing the company’s green credentials in an interview with Brazilian newspaper Valor Econômico last year, CEO Milton Steagall said the firm – which grows palm on about 75,000 hectares (185,000 acres) in the northern Amazon states of Pará and Roraima – “only cultivates the plant in the areas permitted by law”.

“Our sustainable palm cultivation recovers areas already degraded by deforestation and contributes to keeping the Amazon rainforest standing,” he said.

A sign in a field promotes Grupo BBF’s project to produce SAF, São João da Baliza, Brazil, April 2025. (Photo: Christian Braga/InfoAmazonia)

Illegally cleared land

BBF, which says it is the biggest palm oil producer in Brazil, makes palm-based biodiesel that fuels a network of power stations in the Amazon region, supplying some 140,000 customers.

The plan to produce SAF from the same feedstock would be its first foray into a new market that is set to take off in the coming years, as more countries – including Brazil – require their aviation sectors to start using greener fuel.

But InfoAmazonia’s investigation suggests that sourcing rising amounts of SAF from crops like palm that are grown in tropical forest countries – from Brazil to Malaysia – poses a threat to rainforests that are vital stores of climate-heating carbon.

Is the world’s big idea for greener air travel a flight of fancy?

InfoAmazonia identified the illegally deforested areas being used by BBF in southern parts of Roraima by analysing data from the Earth Index platform, which draws on artificial intelligence (AI) and satellite images to determine land use.

The data was then cross-referenced with maps of embargoed areas produced by the government’s Ibama agency. In April this year, the InfoAmazonia team visited the sites and confirmed the existence of the palm crops.

Their analysis found that a total area of 164 hectares (405 acres) close to São João da Baliza had been embargoed by Ibama, meaning the land cannot be used for agriculture.

While the area – roughly equivalent to 250 soccer pitches – represents a small fraction of BBF’s total plantations, the findings highlight the deforestation risks of large-scale oil palm cultivation in the Amazon.

High-resolution satellite imagery shows one of the embargoed areas in São João da Baliza, Brazil, 2025. Airbus DS / Earth Genome.
High-resolution satellite imagery shows one of the embargoed areas in São João da Baliza, Brazil, 2025. (Image: Airbus DS / Earth Genome)

None of the plots are officially registered in BBF’s name – something that is relatively common in Brazil’s land registry – but when InfoAmazonia visited them, the company’s logo could be seen displayed clearly on the fences of each.

Pictures taken with a drone of one of the areas show a field that appears to have been recently planted with palms cutting into a forested area that stretches toward the horizon. A few tall trees dot the newly planted area.

Asked about InfoAmazonia’s findings, BBF said it had never been informed about the issuance of environmental penalties on any of its land in Roraima.

“(The company) has (completed) the environmental licensing processes with the State Foundation for the Environment and Water Resources (FEMARH) in all of its areas, which are necessary for the sustainable cultivation of oil palm in the state of Roraima,” a BBF spokesperson told InfoAmazonia.

Pasture and bananas make way for palm

Palm oil production in Roraima as a whole rose nearly 40 times between 2019 and 2023, according to data from the Brazilian Institute of Geography and Statistics (IBGE).

Even when palm is planted only on degraded land, the spread of plantations puts “indirect pressure” on forested areas, said Eder Carvalho, chief inspector at Ibama’s Roraima branch.

“Old pasture is replaced by palm, with forested areas in turn being cleared to make way for new pasture and banana cultivation,” he said, explaining a process often referred to in climate and environmental risk assessments as “indirect land use change”, or ILUC.

It is because of the high risk of ILUC linked to palm oil cultivation – and the related carbon dioxide emitted when forests are destroyed – that virgin palm oil is not permitted as a feedstock for SAF in Europe.

Community member Sebastiana Waiwai prepares food with banana trees in the background, São João da Baliza, Brazil, April 2025. (Photo: Christian Braga/InfoAmazonia)

Large plantations of a single crop, a practice called monoculture, cause other environmental problems, too, opponents say, taking a heavy toll on biodiversity, depleting water supplies and often involving substantial use of pesticides and other agrochemicals.

In the Amazon, researchers say monoculture also depletes the so-called flying rivers – moist air currents – that carry rain to other parts of Brazil.

“The forest stores a lot of water in the soil, and the trees have deep roots, which lead to evaporation that cools the air, keeping the temperature low,” said climatologist Carlos Nobre, from the National Institute for Space Research (INPE), one of the first scientists to study flying rivers.

Green fuel of the future?

Environmental campaigners warn that allowing the use of non-waste vegetable oils like virgin palm oil as a feedstock for SAF would both fuel forest loss and harm the global and local climate in big commodity-producing nations with important rainforest ecosystems such as Brazil, Malaysia and Indonesia.

“We can’t go backwards and return to fuels made from plants, like palm,” said Cian Delaney, a campaign coordinator with the Belgium-based Transport & Environment organisation, adding that no agricultural crop should be used in SAF production.

“This is a fundamental point from an environmental point of view. This cannot open space for the expansion of first-generation crops,” he said.

Air travel’s ‘holy grail’: Jet fuel made from CO2 and water prepares for take-off

Due to such concerns, the EU and Britain require SAF to be made from waste products such as used cooking oil (UCO), as they began this year to mandate SAF blending into jet fuel as a way to reduce air travel’s hefty carbon emissions.

But a months-long investigation by Climate Home and its partner The Straits Times has uncovered an opaque global supply chain for UCO that exposes jet fuel providers and their aviation clients to fraud risks and raises doubts about the climate benefits of the sector’s main green hope for the years ahead.

The US takes a more lenient approach on SAF feedstocks, allowing crop-based SAF derived from corn or sugarcane.

‘Saudi Arabia of SAF’

Brazil, which is set to allow non-waste vegetable oils like palm to be used in SAF production, wants to position itself as a major global player in efforts to decarbonise transport – including flying.

Aviation currently accounts for about 2.5% of global carbon emissions.

The government of President Luiz Inácio Lula da Silva has highlighted Brazil’s potential to become a leading producer of feedstocks for SAF, which it has dubbed the “fuel of the future”.

As part of the government’s plans, airlines operating in Brazil will have to meet emissions-cutting targets by using a SAF fuel blend, starting with a 1% emissions reduction in 2027 that will rise to 10% by 2037.

Since BBF unveiled its trailblazing SAF plan, several more such projects have been announced, with tallow – a byproduct of cattle ranching – soy oil and ethanol made from sugarcane among the planned feedstocks. Brazil unveiled $1 billion in public financing last year for SAF projects, and received more than 70 proposals.

Gilberto Peralta, CEO of Airbus Brazil, told an agricultural investment conference last year that Brazil could become “the Saudi Arabia of SAF”, with its potential production far exceeding domestic needs. Like other SAF advocates, he argues that ample areas of degraded land could be used, without causing further deforestation.

But the controversy over using non-waste feedstocks could be one of the “key challenges” facing Brazil’s nascent SAF industry in competing abroad, said Pedro Guedes, biofuels analyst at Brazilian think-tank E+ Energy Transition Institute.

Human rights warning

Despite the growing hype around green aviation fuel, BBF’s financial difficulties and ongoing debt negotiations with its creditors have clouded its target to launch SAF production at the 2 billion reais ($390 million) biorefinery this year or in 2026.

Asked whether the refinery was scheduled to launch as planned, the company told InfoAmazonia it “will not be able to comment on new business operations due to the complex debt restructuring process”, adding that BBF aimed to “continue its strategic plan and resume sustainable growth of its operations”.

In its first-quarter report this year, the company told investors it faced “difficulty in obtaining new lines of financing to complete long-term projects”, without directly mentioning the refinery.

An aerial image of a plant operated by Brasil BioFuels in São João da Baliza, Brazil, April 2025. (Drone image: Christian Braga/InfoAmazonia)

The company’s financing troubles began in August 2023, when Brazil’s National Human Rights Council (CNDH) recommended that seven banks – among them state development bank BNDES, state-run Banco do Brasil and Banco da Amazônia – should halt loan deals with the company over suspected violations against Indigenous people and others in Acará and Tomé-Açu in Pará, related to land disputes.

For years, tension between some local communities and BBF has simmered in the Amazon region over land ownership and rights – sometimes erupting into violence. The CNDH’s recommendation to banks came months after state prosecutors sought the arrest of a BBF director and its security chief for offences including torture.

The company denies wrongdoing in the case and says it has “suffered continuous invasions” of its properties in Pará since 2021.

‘No hunting, no fishing’

Back in Roraima, beside a muddy unpaved road outside São João da Baliza, signs reading “Private property” and “Hunting and fishing prohibited” stand in front of a plantation of mature oil palms.

The protected Indigenous Territory (TI) of the WaiWái people lies only about 10 km (six miles) away, but local leader Alexandre Waiwai said community members had no interest in hunting on the palm plantations, preferring to search for animals in the forest beyond.

Community leader Alexandre Waiwai stands inside his wooden house, near São João da Baliza, Brazil, April 2025. (Photo: Christian Braga/InfoAmazonia)

Standing in his wooden house, the walls decorated with bows and arrows, Waiwai said many people feared that animals grazing on the plantations might ingest agrochemicals – despite BBF’s assurance it does not use them on its palm crops.

“Some animals like boar eat palm fruit. We’re afraid of contamination through the meat we hunt and also our water,” Waiwai said.

Villagers also complain about fires in areas surrounding their territory and smoke billowing out of the chimneys of BBF’s industrial plant. Community health worker Vanilda Waiwai said locals report high levels of respiratory problems.

The challenges facing BBF could hold lessons for other firms hoping to launch SAF projects in Brazil.

Guedes, from the E+ Energy Transition Institute, said Brazilian SAF producers expect human rights to be key parameters for entering international markets, adding that the country’s recently created national SAF programme is likely to take into account rights as well as biodiversity safeguards.

“We know we’ll have to present our credentials on human rights. There’s a concern in general (about human rights impacts) and Brazil is aware of that concern,” he said.

This investigation was developed with the support of Journalismfund Europe.

The post Brazilian firm behind SAF plan found growing oil palm on deforested Amazon land appeared first on Climate Home News.

Brazilian firm behind SAF plan found growing oil palm on deforested Amazon land

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Pawa in Palau

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This week our powerful Pacific team is in Palau for the Pacific Islands Forum Leaders Meeting. This is a major moment in our campaigns for Pacific climate justice and to stop deep sea mining. So what’s it all about, what can we expect over the coming days, and why is this year’s meeting in particular so important? Read on to find out!

*Pawa is Melanesian word meaning collective power.

Meet Moemoana Schwenke, our Pacific Climate Campaigner

“When you love something deeply, you do everything you can to protect it.”

@greenpeaceap

For us in the Pacific, protecting our home is an expression of love. Follow our journey across the Pacific all the way to COP31 in Türkiye. Pacific voices continue to lead the call for climate justice champion our priorities and build a movement for a Fossil Fuel Free Pacific, from our islands to the world. Join the movement and follow the journey. @Moemoana Schwenke

♬ original sound – Greenpeace Australia Pacific

What is the Pacific Islands Forum (PIF)?

The Pacific Islands Forum, or ‘PIF’, is our region’s most important political organisation. It is where countries of the Pacific — including Australia and New Zealand — come together to collaborate on shared challenges and to set collective goals.

The PIF Leaders Meeting is an annual weeklong event that includes a dedicated meeting of the Pacific’s small island developing states (PSIDS), many special side events organised by Pacific civil society, the leaders’ meeting itself, and more. At the end of the week, leaders issue a Forum Communiqué, capturing what they have agreed on, their shared priorities and the actions they will take together.

This year’s meeting is being held in the beautiful northern Pacific nation of Palau, the same place our Pacific team gathered back in January to plan for the year.

Islands in Palau
© Hector John Periquin

What’s at stake this year?

Climate change has dominated the PIF for decades. Pacific leaders have been crystal clear it is their number one priority, and the annual gathering is the moment they can exert maximum pressure on Australia over its fossil fuel record.

The voyage to COP31

This year’s meeting comes less than three months before COP31, where Australia will take on the role of President of Negotiations — a role it has committed to undertaking in partnership with the Pacific — and less than a month before the ‘Pacific Pre-COP’, to be held in Fiji and Tuvalu.

Following a fraught round of mid-year negotiations in Bonn, PIF leaders will need to set out a clear vision and priorities for COP31. These include accelerating a just global transition away from fossil fuels, defending science as the foundation of international climate cooperation, and increasing the availability and accessibility of finance for renewable energy and climate adaptation.

Pictured left to right - 
- Dr Simon Bradshaw, COP31 Lead and report author, Greenpeace Australia Pacific
-Belyndar Rikimani, Campaigns and Research Lead, Pacific Islands Students Fighting Climate Change
-Shiva Gounden, Head of Pacific, Greenpeace Australia Pacific
© Greenpeace / Marie Jacquemin

Accountability for Australian fossil fuel exports

Since the last PIF Leaders Meeting, Australia has signed the Belém Declaration on the Transition Away from Fossil Fuels. The declaration reaffirmed the legally binding commitment to help limit global warming to 1.5°C and recognised that this is incompatible with new fossil fuel production. Yet, Australia has continued to approve new coal and gas projects, including at least five since the last PIF Leaders Meeting.

Barry Dick observes the community graveyard impacted by coastal erosion on Pele Island in Vanuatu.
© Niki Kuautonga / Greenpeace

What is Greenpeace doing?

We’re going big this year, taking six members of our team to Palau to support Pacific leaders to hold the line, hold Australia accountable, and show the world what’s at stake. We’ll lobby leaders, hold press conferences, share our messages with the world, and support our incredible local partners in Palau.

Members of the Greenpeace Pacific team at the Pacific Islands Forum leaders' meeting in Palau, 2026.

How can you get involved?

PIF is the first in a drumbeat of major moments where we’ll be carrying the voices of the Pacific to the world. Come October we’ll be voyaging to Fiji on our ship Oceania for the Pacific Pre-COP, and in November we’ll be off to Antalya for the world’s climate negotiations (COP31).

Learn more about the Pacific way to a fossil fuel free future by checking out our report and exhibition.

Follow our journey, and check back here for more ways to join the movement for climate justice. Together we have the pawa!

Pawa in Palau

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Climate Change

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

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Gill Einhorn is head of the Forest Future Alliance and Natalie Çilem is community lead of the Global Wildfire Leadership Network.

Wildfires have devastated communities across the world this summer, claiming lives, displacing thousands of people and leaving billions in economic damage in their wake. In Europe alone, wildfires have already caused an estimated €19 billion in losses this year.

They are an economic, financial and public health challenge that is growing faster than many governments and markets are prepared for – and exposing the real costs of poor land management.

A system built for recovery, not resilience

Far more money is currently spent responding to the disastrous effects of wildfires than preventing them in the first place. The United Nations Environment Programme estimates that more than half of wildfire-related spending goes towards response, while planning receives only around 0.2 percent. This problem is not limited to wildfires; over 95 percent of disaster aid between 2005 and 2017 was allocated to response, and less than 4 percent was directed towards prevention or preparedness.

Forests are critical, but without investment in how land is managed and protected, their value is neither stable nor guaranteed. Protecting forests requires investing not only in conservation, but in the conditions that keep forests standing.

    Each dollar invested in wildfire-resistant construction could save around $210 in avoided future economic losses, according to a report by the World Economic Forum and Forest Future Alliance. Despite this evidence that prevention can significantly reduce future costs, wildfire resilience remains chronically underfunded.

    This spending discrepancy is creating significant challenges for insurers, asset owners and financial institutions. Global insured losses from natural catastrophes reached $107 billion in 2025, with wildfires, floods and storms accounting for 92 percent of claims.

    In this context, insurers are reassessing where and how they are willing to underwrite risk. Around 56 percent of global wildfire losses between 2000 and 2023 were uninsured. In some high-risk areas, insurers are scaling back coverage altogether, leaving homeowners, businesses and governments to shoulder a growing share of the costs – making it increasingly difficult to break even.

    Proven solutions are already paying off

    In many regions, wildfires are driven not by natural causes but by the deliberate clearing of land for agriculture. Degraded landscapes are becoming drier, more flammable and increasingly vulnerable to catastrophic loss, creating a vicious cycle of deforestation, economic damage and rising emissions.

    The answer is not simply stronger firefighting capacity. Governments, investors and businesses must work together to shift capital upstream into prevention, resilience and long-term landscape stewardship of healthy forests. That means planting appropriately, investing in heat-resistant species, exploring approaches that minimise fire footprints through active management, and exploring the AI and technology solutions that are burgeoning.

    A burnt olive tree in an area affected by a wildfire in Ano Sichaina near Patras, Greece, August 14, 2025. REUTERS/Louiza Vradi

    A burnt olive tree in an area affected by a wildfire in Ano Sichaina near Patras, Greece, August 14, 2025. REUTERS/Louiza Vradi

    Solutions to this already exist and are proven to have an impact. Following devastating wildfires year-on-year, Portugal shifted its approach to wildfire management, increasing prevention spending within its national rural fire management system from around 20 percent in 2017 to approximately 60 percent in 2022. While many countries remain locked in a reactive cycle of disaster response, public policy can shift investment upstream and make resilience a priority before fires occur.

    Indigenous communities have long used proactive land stewardship to reduce wildfire risk while supporting healthy and productive landscapes. For example, the Cheslatta Carrier Nation in British Columbia traditionally managed fuels through cultural fire practices but now implements mechanised fuel removal methods under commercial agreements. By combining Indigenous stewardship with sustainable forest management, Cheslatta is generating community benefits while also boosting wildfire prevention.

    Resilience can also be strengthened through finance and technology. FireSat, a partnership led by Earth Fire Alliance with Google.org, the Gordon and Betty Moore Foundation and Muon, is a satellite constellation designed for rapid wildfire detection. Scanning every 20 minutes, it can detect fires 400 times smaller than current systems and track them through smoke and darkness in almost real time. In California alone, FireSat could prevent up to 350,000 acres from burning each year. It has recently received significant new investments allowing it to expand towards a constellation of more than 50 satellites that will monitor every point on Earth every 20 minutes or less.

    In Brazil’s Pantanal, the Embrace the Forest initiative uses AI-powered detection towers across 2.5 million hectares to support earlier intervention and faster response. During the severe 2024 fire season, the initiative contributed to a 40 percent reduction in burned area compared to 2020.

    A drone view shows burnt cars following a wildfire in Dymi, near Patras, Greece August 14, 2025. REUTERS/Louiza Vradi

    A drone view shows burnt cars following a wildfire in Dymi, near Patras, Greece August 14, 2025. REUTERS/Louiza Vradi

    These examples illustrate what is possible when resilience is treated as an investment priority rather than a recovery cost. But we must ensure funding for these measures is scaled before disaster strikes. Initiatives like the Global Wildfire Leadership Network (GWLN) are key, bringing together corporate decision-makers, investors, insurers, governments and Indigenous leaders to direct investment towards prevention and align finance, technology and stewardship to protect nature, safeguard communities and strengthen future economic stability. With a goal of doing more together than the sum of our parts, the network focuses on Forest Future Alliance GWLN Solutions Labs – where partners sign up with the intent to collaborate.

    Rewarding prevention

    Financial incentives must be created that reward prevention. This can be done by scaling public-private partnerships, supporting long-term landscape stewardship, investing in community capacity including Indigenous wisdom and technology. Ultimately, our terrestrial natural reserves are critical infrastructure that support resilient economies and thriving communities.

    One in three people are dependent on forest services, goods and economic opportunities for survival, so it’s in all our interests to protect what we have. Forests support cooling, water and food security – and are a very cost-effective way of removing carbon dioxide from the atmosphere, where done appropriately.

    UN chief warns climate crisis “in overdrive” as El Niño threatens to fuel the fire

    No sector can solve this challenge alone. The benefits of wildfire resilience are shared across communities, governments, insurers, investors, utilities and businesses. A single intervention can protect homes and livelihoods, reduce insurance claims, secure water supplies and lower future public costs. Because the benefits are shared, the solutions must be too. Coalitions of actors can take proven approaches further than any one individual or organisation could alone.

    As wildfires continue to burn at an unprecedented scale, the opportunity now is to roll out solutions, shift investment upstream and build a future where resilience, rather than recovery, becomes the foundation of thriving economies.

    The post From firefighting to future-proofing: Preventing wildfires must be the priority appeared first on Climate Home News.

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

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    Climate Change

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

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    Methane is a powerful greenhouse gas and the second-largest contributor to global warming after carbon dioxide (CO2).

    Methane traps heat in the atmosphere more efficiently than CO2, but has a significantly shorter lifespan, fading after just a few decades.

    Therefore, reducing emissions of methane – a gas primarily produced by agriculture, fossil fuels and waste management – is a powerful option for limiting global warming in the near-term.

    Yet climate strategies and models often only focus on CO2, or combine all greenhouse gases into one metric known as “CO2 equivalent”.

    The latter approach makes reducing methane emissions dependent on modelling choices and assumptions about the “equivalence” of methane and CO2.

    It hides the opportunities and challenges linked to methane’s high warming and short lifetime.

    In a new study, published in Communications Earth & Environment, we offer a different perspective that “decouples” CO2 and methane reduction and takes global warming limits as a starting point for determining the required level of methane cuts.

    We show that, even under the most ambitious existing national net-zero targets, an absence of methane reduction leads to peak warming that exceeds 1.85C above pre-industrial levels.

    The study highlights that, to limit peak warming to well-below 2C, net-zero CO2 targets must be complemented by stringent methane emissions cuts.

    CO2 equivalent

    How much methane corresponds to one tonne of CO2?

    The question is as difficult to answer as: ‘how much spaghetti equals a chicken?’ You could compare the two meals according to their calories, protein content or cost. Each metric can be convenient, but is only valid for that specific comparison – no amount of spaghetti is the same as a chicken.

    The same is true for the conversion of emissions of methane and other gases to CO2-equivalent emissions. It can be convenient, as it allows different gases to be compared or combined into a single number. This is why the metric is used in climate targets or evaluating the effectiveness of different mitigation options.

    But, because methane and CO2 have different atmospheric lifetimes and warming properties, any conversion is only valid for a chosen time horizon and a chosen baseline.

    Depending on the assumptions baked into calculations, methane mitigation can either appear as an immediate priority or framed as almost unnecessary.

    There are a number of metrics that scientists use to convert greenhouse gases – whether methane, hydrofluorocarbons or nitrous oxide – into CO2-equivalent emissions:

    • “GWP20” measures how much heat a greenhouse gas traps in the atmosphere over a 20-year period, relative to CO2. It emphasises urgent methane mitigation but has been criticised for its implicit discounting of future damages.
    • “GWP100” looks at a 100-year timeline. It gives more weight to long-term warming and is used in “integrated assessment models” (IAMs) used by scientists, national emission reporting to the UN and by the GHG Protocol used by companies.
    • GWP*” considers the rate of emissions, rather than warming over a fixed time horizon. Under GWP*, very limited methane reductions bring CO2-equivalent emissions to zero, meaning remaining methane emissions can be designated as causing “no additional warming”. (This interpretation remains controversial as it assumes the continuation of historical levels of warming.)

    IAMs are the tools used to generate future emissions scenarios. Because they combine CO2 and methane emissions, the impact of methane emission cuts alone is difficult to isolate in existing emission scenarios.

    IAM-generated scenarios also assume mitigation decisions driven by costs. Combinations of CO2 and methane emission pathways that are not purely cost-effective are, therefore, not represented, even though climate policy is messy and emission pathways are rarely cost-effective in the real world.

    Only a few countries – including Japan, Mexico and South Korea – specify methane mitigation targets.

    A different approach

    In our study, we separate CO2 and methane emissions and treat them as independent.

    Instead of choosing a conversion method, we suggest that states and organisations set a limit on peak global warming first, then, based on their existing net-zero targets, determine the minimum compatible methane reduction target.

    Companies and countries around the world have set net-zero targets focused on CO2, as well as those that include all greenhouse gases. As a result, our research looks at the necessary methane reductions for both types of goal. We consider scenarios where companies or countries deliver linear – in other words, steady – emissions reductions to reach net-zero.

    Using a simple climate model, we systematically combined methane and CO2 (or greenhouse gas) mitigation pathways starting in 2025 and calculated peak warming.

    The figure below shows how peak warming depends on both the year of reaching net-zero CO2 and the level of methane cuts.

    Peak global warming relative to 1850-1900 reached until 2100 (50% likelihood), for combinations of the year of global net-zero CO2 emissions (x-axis) and the change in global methane (CH4) emissions between 2020 and that year (y-axis), assuming linear trajectories. Black lines are contours of equal peak warming. The three bars on the right show independent estimates of where CH4 emissions could or would land on the same vertical scale: CH4 mitigation available at no net cost (IEA, red), the 2030 mitigation potential (Global methane status report, orange), and the current legislation scenario for 2050 (Global methane status report, purple). Adapted from Weber et al. (2026).

    The blue arrows in the figure show that to limit warming to 1.7C under a 2050 net-zero CO2 scenario, methane emissions would need to fall by at least 69% by 2050, relative to 2020.

    Our research also finds that, if an organisation or country’s 2050 net zero-target covers all greenhouse gases, its methane emissions would need to fall by 63% instead.

    However, under current policies, methane emissions are expected to increase by around 20% by 2050, relative to 2020. We find that this pathway would result in peak warming above 2C by 2050 – even if global CO2 emissions were to reach net-zero by that date (see purple bar on the right-hand side of the figure above).

    The figure also shows how, if methane emissions remained at 2020 levels and net-zero CO2 was delivered by 2040 or later, warming would exceed 1.85C. This level of warming is above what has been argued as consistent with the Paris Agreement’s “well-below” 2C limit.

    Conversely, cutting methane emissions by around one-third – in line with the Global Methane Pledge target for 2030 – could reduce peak warming by 0.15C, of which 0.05C could be delivered by interventions that come at no net cost. These are shown by the orange and red bars, respectively, on the figure above.

    The table below highlights the minimum compatible methane cuts for three different peak warming levels and net-zero CO2 or greenhouse-gas emission targets.

    Peak warming Year of net-zero CO2 emissions Year of net-zero greenhouse-gas emissions
    2050 2060 2100 2050 2060 2100
    1.7C -69% -63%
    1.8C -32% -56% -11% -47%
    2C +8% -8% -83% >50% +33% -78%

    Minimum methane emission reductions between 2020 and the year of net-zero emissions, consistent with peak warming of 1.7C, 1.8C, and 2.0C at 50% likelihood, assuming linear emission trajectories. For some net-zero targets and peak warming levels, there are no compatible methane mitigation targets (indicated by “–”).

    Remaining carbon budget

    The global carbon budget refers to the amount of cumulative CO2 emissions allowable while still meeting a particular global warming threshold.

    The 2021 climate science report from the Intergovernmental Panel on Climate Change (IPCC) and a 2023 Nature study estimated that, by 2025, the remaining carbon budget for holding warming to 2C would be around 1,000-1,150bn tonnes of CO2 (GtCO2).

    We find that these estimates are founded on the assumption of methane reductions of 27-35% by 2050, relative to a 2020 baseline. (A 2024 Communications Earth & Environment study reached similar conclusions.)

    Under the GWP* metric, where methane emissions are only cut to maintain “no additional warming”, the remaining carbon budget would be constrained. The best estimate of a 2C budget shrinks by around 30% to approximately 750GtCO2.

    Finally, if methane emissions are not cut at all in the future, our findings suggest that the remaining carbon budget for 1.7C of global warming has, in effect, already been exhausted.

    Our analysis shows how peak warming depends on both CO2 and methane reduction – and how methane-specific targets can help refine existing net-zero targets.

    Crucially, we show that complementing net-zero CO2 targets with stringent methane cuts is necessary to limit peak warming to well-below 2C.

    Weber, K. et al. (2026) Limiting warming by CO2 and methane mitigation in an expanded scenario space, Communications Earth & Environment, doi:10.1038/s43247-026-03832-1

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

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

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