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Welcome to Carbon Brief’s DeBriefed. 
An essential guide to the week’s key developments relating to climate change.

This week

Asian extreme weather

SWELTERING: An intense heatwave is sweeping across south and eastern Asia. The Dhaka Tribune said temperatures in Bangladesh have surpassed 40C in many regions and the Daily Star reported that the country recorded at least 23 days “heatwave days” in April. Agence France-Presse reported that Thailand’s capital, Bangkok, reached 40.1C on Wednesday. The Bangkok Post added that temperatures could reach 43C in northern Thailand next week. (See Carbon Brief’s recent on-the-ground reporting on the impacts of climate change on human migration in Thailand.) Schools across the Philippines, Bangladesh and India have been forced to close due to the heat, according to BBC News

ELECTION HEAT: In India, the heatwave coincides with the country’s six-week general election, in which nearly one billion people are eligible to vote, the New York Times reported. India’s election authorities have set up a taskforce “to review the impact of heatwave[s]” on the election after a significant decrease in voter turnout, the Indian Express said. India’s Economic Times added that temperatures in the country will peak on 27-28 April.

FLOODING: More than 110,000 people have been evacuated from China’s Guangdong province after record-breaking rainfall caused widespread flooding, state news agency Xinhua reported. China Daily said that southern China has experienced more than double the typical rainfall for April. The flooding has caused economic losses exceeding 140m yuan ($19.8m), according to the People’s Daily Online. Meanwhile, the Financial Times reported that the World Meteorological Organization has published a report warning that climate change “is causing major repercussions across Asia”.

Legal action

HISTORIC ENQUIRY: The Inter-American Court on Human Rights in Barbados is hearing the first part of a “historic” inquiry this week, the Guardian said. The New Humanitarian reported that Colombia and Chile are “asking the hearing to define states’ legal responsibility to combat climate change and prevent it from violating people’s human rights”. It added that the court will hear from Julian Medina, a Colombian fisherman, among others.

HEALTH FAILURE: A group of South Koreans is suing their government for failing to protect 200 people, including young environmental activists and children, by not tackling climate change, Reuters reported. “The proceeding is Asia’s first such climate-related litigation,” the newswire added. Meanwhile, BBC News reported that an Iraqi man is taking legal action against BP, alleging that his late-son’s leukaemia was caused by the oil company’s flaring practices.

SUSPENDED: Meanwhile in the UK, Dr Sarah Benn, a retired GP in Birmingham, has had her medical licence suspended for five months following her involvement with Just Stop Oil protests and risks being stuck off permanently, the Guardian reported. According to the Times, the 57-year-old was previously jailed for 31 days after taking part in three climate protests at an oil terminal in Kingsbury in 2022. There has been backlash to the ruling, which the British Medical Association called “very concerning”, the paper added.

Around the world

  • EARTH DAY: US president Joe Biden marked “Earth Day” on Monday by announcing $7bn of investment into solar energy projects, the New York Times reported.
  • CONTROVERSIAL TREATY: EU lawmakers have voted “overwhelmingly” for the bloc to leave the international energy charter treaty, according to the Financial Times. The paper called the ruling a “victory for climate advocates”, adding that many think the treaty protects fossil fuels.
  • UNHELPFUL SLOGAN: Chris Stark, the outgoing chief executive of the UK’s Climate Change Committee, told the Guardian that “net-zero” has become an “unhelpful” slogan, which is often “associated with the campaigns against it”.
  • MEXICAN DROUGHT: Nearly 80% of Mexico’s territory is now under drought conditions, Excélsior reported. EuroNews added that drought, combined with a surge in water demand to grow crops such as avocados, is causing rivers and lakes to dry up in the “once green and lush” state of Michoacan.
  • DEADLY FLOODS: Countries across east Africa have been “lashed by relentless downpours in recent weeks”, Al Jazeera reported. The outlet warned that “deadly floods” are sweeping through Kenya’s capital Nairobi.
  • CLIMATE RISK: The World Bank is advising South Africa’s national treasury on climate risk strategies, such as taking out climate insurance or setting up contingency funds, following floods which have caused billions of dollars of damage in recent years, reported Bloomberg.

2.4 billion

The number of workers globally expected to face “excessive heat conditions” at some point during their careers, according to an ​​International Labor Organization report covered in the Associated Press.


Latest climate research

  • A study in Nature Climate Change found that meteorological definitions for extreme weather events do not fully capture the negative impacts experienced by women in informal settlements.
  • The area of land in east Africa affected by combined heatwaves and wildfires could increase by 940% by the end of the century, according to new research in Earth System Dynamics.
  • New analysis by the World Weather Attribution service found that the heavy rainfall that hit Oman and the United Arab Emirates recently was 10-40% heavier than it would have been in an El Niño year without climate change.

(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)

Captured

Monthly global average temperatures since June 2023 have set record highs. Chart for DeBriefed.

The past 10 months have all set new all-time monthly global temperature records, with April 2024 on track to extend this streak to 11, wrote Dr Zeke Hausfather in his latest quarterly “state of the climate” report for Carbon Brief. The graph shows monthly temperatures over 1940-2024, plotted with respect to a 1850-1900 baseline. Based on the year so far and the current El Niño forecast, Carbon Brief estimates that global temperatures in 2024 are likely to average out at around 1.5C above pre-industrial levels.

Spotlight

Climate science in the courtroom

Prof Wim Thiery

Last week, a group of 2,000 Swiss women won a landmark case in the European Court of Human Rights. The women, mostly in their 70s, said that their age and gender made them particularly vulnerable to heatwaves linked to climate change. The court ruled that Switzerland’s efforts to meet its emissions targets had been “woefully inadequate”.

At the annual European Geosciences Union (EGU) general assembly in Vienna, Carbon Brief interviews Prof Wim Thiery – a scientist who was involved in multiple conference sessions on climate change and litigation. This interview was edited for length.

Carbon Brief: What types of climate science are used in litigation?

Prof Wim Thiery: Just like how there’s a range of different subfields in climate science, we have a range of different climate cases. For example, there’s attribution science which supports reparation cases. We are seeing carbon budget research and fair-share emission pathways research supporting cases on climate policies. And we’re also seeing future climate impact projections supporting cases that are started by young people around the world.

CB: What science was used in the recent European case?

WT: Impact attribution research played a key role. Recent studies by [Oxford University researcher] Dr Rupert Stewart-Smith and [Swiss epidemiologist] Dr Anna Vicedo-Cabrera, for example, showed that all women in Switzerland are disproportionately at risk of heat-related mortality in Switzerland. So, these are recent scientific publications that were directly mentioned in court and that played an influence on the final court ruling.

CB: Do you think the methods used in attribution science are changing to better support litigation?

WT: We are seeing an evolution in attribution science, whereby we move from the traditional science of long-term trends in climate variables, to the operational ability to – in almost real time – establish the link of climate change with the occurrence of individual extreme events. And we’re seeing a new evolution whereby communities are increasingly looking at impact-relevant variables. Think about inundated areas, lake levels, heatwave mortalities. These are the new target variables of attribution science. This is a new frontier and we are seeing that those studies are directly usable in court cases.

CB: Do you ever worry about your research, or that of your colleagues, becoming ‘too political’?

WT: We are used to, in climate science, working with policymakers and with society. Our research is of direct societal relevance and this is just a new example. For me, this is just another example of working with stakeholders – lawyers are a new group of stakeholders for our community.

There is a very direct and tangible impact when you see that an attribution study or a particular scientific publication is used in a court case and has a direct effect on its evolution. It’s very tangible, the outcomes, and I think that’s something which motivates climate scientists in engaging in this community.

Watch, read, listen

FAKE MEAT: Climate YouTuber Simon Clark has published a video asking: “How green is fake meat, really?” To answer the question, he compared the carbon and land footprints of beef, chicken, pork and mutton with those of major meat substitutes.

GROWING GULLIES: A multimedia-rich BBC News article explained how soil erosion is causing vast gullies and chasms to open up around Latin America and Africa, destroying tens of thousands of homes.

GREENWASHING ADS: The Financial Times and Reuters have taken down “advertorials” paid for by oil giant Saudi Aramco, following allegations of greenwashing and disinformation, DeSmog reported.

Coming up

Pick of the jobs

DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.
This is an online version of Carbon Brief’s weekly DeBriefed email newsletter. Subscribe for free here.

The post DeBriefed 26 April 2024: Extremes grip Asia; Human rights inquiry; Using climate science in court appeared first on Carbon Brief.

DeBriefed 26 April 2024: Extremes grip Asia; Human rights inquiry; Using climate science in court

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Climate Change

Pawa in Palau

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

*Pawa is Melanesian word meaning collective power.

Meet Moemoana Schwenke, our Pacific Climate Campaigner

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

@greenpeaceap

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

♬ original sound – Greenpeace Australia Pacific

What is the Pacific Islands Forum (PIF)?

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

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

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

Islands in Palau
© Hector John Periquin

What’s at stake this year?

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

The voyage to COP31

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

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

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

Accountability for Australian fossil fuel exports

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

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

What is Greenpeace doing?

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

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

How can you get involved?

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

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

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

Pawa in Palau

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Climate Change

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

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

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

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

A system built for recovery, not resilience

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

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

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

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

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

    Proven solutions are already paying off

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

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

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

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

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

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

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

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

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

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

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

    Rewarding prevention

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

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

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

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

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

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

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

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    Climate Change

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

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

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

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

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

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

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

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

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

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

    CO2 equivalent

    How much methane corresponds to one tonne of CO2?

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

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

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

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

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

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

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

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

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

    A different approach

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    Remaining carbon budget

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

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

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

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

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

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

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

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

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

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