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Welcome to Carbon Brief’s Cropped.
We handpick and explain the most important stories at the intersection of climate, land, food and nature over the past fortnight.

This is an online version of Carbon Brief’s fortnightly Cropped email newsletter. Subscribe for free here.

Key developments

Mass coral bleaching event

GLOBAL EVENT: The US National Oceanic and Atmospheric Administration (NOAA) announced last week that the “world is currently experiencing a global coral bleaching event” – the fourth ever and the second this decade. “Mass bleaching” of reefs in every major ocean basin has been documented since early 2023, according to NOAA’s Coral Reef Watch. Dr Derek Manzello, the Coral Reef Watch coordinator, said: “When these events are sufficiently severe or prolonged, they can cause coral mortality, which hurts the people who depend on the coral reefs for their livelihoods.” However, death is not a foregone conclusion for bleached reefs – corals can recover if the heat stress diminishes. According to the New York Times, “scientists say it’s too soon to estimate what the extent of global mortality will be”.

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‘MAKE YOU WEEP’: In order to declare a global bleaching event, the Pacific, Atlantic and Indian Oceans must all have experienced bleaching in the past year and at least 12% of each basin’s reefs must be at temperatures that can cause bleaching, the New York Times reported. It added: “Currently, more than 54% of the world’s coral area has experienced bleaching-level heat stress in the past year.” Prof Terry Hughes, a coral-reef scientist at James Cook University in Australia, tweeted: “The extent AND severity of coral bleaching on the Great Barrier Reef in 2024 is by far the worst ever recorded.” Hughes added that the results of the surveys “would make you weep”. Australia’s ABC News reported that “the devastation couldn’t be more clear”.

BROADER IMPACTS: ABC News noted that the widespread bleaching “is a clear reflection of the extraordinary ocean temperatures in 2023, which have been rising for decades due to the burning of fossil fuels”. The onset of El Niño also “deserve[s] the blame”, according to Prof Matt England, a physical oceanographer from the University of New South Wales, who was quoted in the article. In the Conversation, four researchers from the University of Sydney wrote that “the damage done by heat underwater goes much further” than the reefs alone. They have already noted changes in algae and water chemistry at their research station, while “mobile macroinvertebrates”, such as starfish and sea urchins, “are in widespread decline”. They added: “Much of the damage done this summer [to reef ecosystems] will take months or even years to manifest.”

Oceans in focus

PIVOTAL PROTECTION: The Dominican Republic has become the first Caribbean nation to designate 30% of its marine areas as protected, El País reported – expanding its protected area coverage from 10.8% to 30.8% of its territorial waters. That includes a new protected area that spans the border between the Dominican Republic and Colombia, fulfilling an agreement that the two countries signed in 2022, the Spanish-language newspaper added. This part of the ocean “functions as a pivotal region for species connectivity”, Oceanographic wrote. The magazine added that it is “both a feeding ground and travel route” for seabirds, whales and other diverse marine species.

BOTTOM-TRAWLING BAN: Greece will ban bottom trawling – a destructive form of fishing – in its national marine parks by 2026 and in all of its marine protected areas by 2030, making it “the first country to pledge to this”, Euractiv reported. Greek prime minister Kyriakos Mitsotakis also announced two new marine national parks, increasing the country’s protected waters by 80%. Mitsotakis said: “The ocean has paid a heavy price for its service to humankind. It has been a vital source of life and livelihood. We have not been kind to it in return.” The announcement was made at the “Our Ocean” world conference in Athens.

RATIFICATION RACE: The Our Ocean conference also saw “more than 400 new commitments” of finance for ocean protection, totalling $10bn, according to Reuters. This included 40 commitments from the EU for many activities, “rang[ing] from fighting marine pollution to supporting sustainable fisheries and investments in the so-called blue economy”, the newswire added. At the conference, the EU and 13 other countries’ governments “urged nations…to prioritise the ratification” of the High Seas Treaty, Reuters said. According to the ratification tracker maintained by the High Seas Alliance, the total number of ratifications increased in April to four, with Belize and Seychelles joining early-adopters Palau and Chile. Sixty countries must ratify the agreement before it can take effect.

Spotlight

Latin America and the Caribbean have a new action plan for protecting environmental defenders

In this spotlight, Carbon Brief reports on the main outcomes of the ongoing Conference of the Parties to the Escazú Agreement, established by Latin America and the Caribbean to protect environmental defenders.

The third Conference of the Parties (COP3) to the Escazú Agreement is taking place in Santiago, Chile, from 22 to 24 April.

The Escazú Agreement is a legally binding regional treaty established by Latin American and Caribbean countries in order to protect environmental defenders and promote public participation and access to information on environmental issues. It has the support of the Economic Commission for Latin America and the Caribbean (ECLAC) and came into force on 22 April 2021.

Since then, 15 countries have ratified the agreement, including Argentina, Bolivia, Chile, Mexico and Ecuador, as well as several Caribbean countries, such as Antigua and Barbuda, Grenada and Saint Kitts and Nevis.

Latin America and the Caribbean accounted for 88% of the world’s environmental and land defenders killings over the previous decade, according to a 2023 report from campaign group Global Witness. The region saw 1,910 killings of defenders between 2012 and 2022, the report noted.

On Tuesday, COP3 saw the approval of the regional action plan on human rights defenders in environmental matters. The document sets out priority areas and strategies to enact article 9 of the Escazú Agreement, which establishes that each party should take action to recognise and protect the rights of environmental defenders and prevent and punish attacks against them.

Graciela Martínez, regional campaigner for the Americas at Amnesty International, told Carbon Brief that the action plan “may be an important step towards the implementation of the Escazú Agreement”. She added that the plan “provides more specific routes for the parties to meet” the agreement – for example, establishing cooperation between parties and recognition of defenders.

Teresita Antazú López, an Indigenous environmental defender of the Yanesha people of the central Peruvian rainforest, told Carbon Brief that Indigenous peoples have a number of demands at this COP. According to López, who was attending the COP as a member of the Interethnic Association for the Development of the Peruvian Jungle, the highest priority is to ensure their effective participation within the negotiations going forward. This includes having an Indigenous caucus to represent them and an Indigenous peoples rapporteur to report on violations in their territories.

As well as public participation and the protection of environmental and land defenders, COP3 has also addressed transparency and access to environmental information.

During a side event hosted by Article 19 Mexico and Central America – an organisation that promotes freedom of expression and access to information – Lourdes Medina, a lawyer specialising in environmental and Indigenous rights, said that if the right to access environmental information is not protected and guaranteed, then other rights are at risk. Medina said:

“The participation of citizens in resistance cannot be guaranteed. There is no adequate mechanism for access to justice and this produces danger and different forms of violence against defenders of human rights in environmental matters.”

News and views

FEELING THE HEAT: Florida governor Ron DeSantis signed a bill preventing local governments in the state from requiring heat-exposure protections for outdoor workers, the Tampa Bay Times reported. The bill was introduced in response to a proposal in Miami-Dade county that would have required employers to provide water and shade breaks to agricultural and construction workers when the heat index is above 95F (35C). More than 90 organisations signed an open letter to the governor saying that removing “local governments’ ability to protect workers from climate-caused extreme heat is inhumane”, according to the newspaper. USA Today wrote that the new law has “frustrated and angered some experts and advocates for construction workers and farmworkers”. It added that “extreme heat kills more people in the US each year than all forms of extreme weather combined”.

ATTRIBUTION IN AFRICA: BBC News covered two new rapid attribution studies from the World Weather Attribution group that focused on Africa. The first found that the ongoing drought in southern Africa that has resulted in crop failures, disease outbreaks and emergency declarations in several countries was influenced by El Niño and not climate change. The second study found that last month’s “deadly heatwave” in west Africa and the Sahel region would have been “impossible” in the absence of human-driven climate change. Meanwhile, “erratic” rain and rising temperatures are putting winegrowers in South Africa’s Western Cape province at risk, according to Agence-France Presse. One winemaker told the website: “If people don’t believe in global warming, they should come to South Africa.”

FOOD CONTROVERSY: Academics from Leiden University and New York University sent a letter to the UN Food and Agriculture Organization (FAO) “urgently requesting a retraction” of its report on pathways towards lower emissions from livestock, which cites their work. They said the report “seriously distorts” their findings regarding the greenhouse gas mitigation potential of dietary changes and pointed out errors in framing, methodology and data. According to the Guardian, although FAO reports are consulted by international bodies, the organisation “is also mandated to increase livestock productivity so as to bolster nutrition and food security”. A FAO spokesperson told the outlet the institution “will look into the issues raised by the academics and undertake a technical exchange of views with them”.

RE-PEAT: A bill introduced in the UK’s House of Commons last week was the government’s “last chance” to fulfil its promise to ban the sale of peat for gardening uses by the end of the current Parliament, according to the Wildlife Trusts. The legislation was introduced by former environment secretary Theresa Villiers, who noted that “peatlands are the UK’s largest carbon store”, according to the ENDS Report. One conservative politician “asked that it be put on the record that the bill ‘will not go unopposed’”, the outlet added. In the Yorkshire Post, Villiers noted that 95% of respondents to the government’s consultation in 2021 supported such a ban. The bill will be presented in the House of Commons again on Friday, 26 April.

‘SOUND’ EVIDENCE: Energy Monitor covered a recent Nature study revealing that forest-based solutions, including forest carbon credits, are supported by more “sound” scientific evidence than other types of nature-based solutions. The outlet noted that forest carbon credits have come under scrutiny for their accounting methods and their impacts on forest communities. The study examined the mitigation potential of 43 nature-based solutions and found that four of them – all related to the conservation and restoration of tropical and temperate forests – “offer the greatest certainty in carbon mitigation potential”.

‘BETTER’ MEAT: The World Resources Institute thinktank published a new report aimed at helping food companies achieve climate, sustainability and ethical goals by sourcing “better” meat – where “better” refers to “environmental, social, ethical and/or economic attributes”. The report recommended six steps companies can take, including calculating the emissions baselines of their food purchases, assessing the potential environmental impacts of their new strategies and engaging with suppliers. The report noted that “better” meat is often associated with higher environmental impacts alongside possible improvements in animal welfare. It also laid out strategies to reduce greenhouse gas emissions from meat production.

Watch, read, listen

WILDLIFE CROSSINGS: A feature in CBS news explored how wildlife crossings throughout the US are reducing roadkill and helping preserve the genetic diversity of species.

GULLIES EXPANSION: BBC News explained how soil degradation has swallowed entire neighbourhoods in Latin America and Africa.

PROTECTING THE AMAZON: A documentary by Al Jazeera showed how the Indigenous Yanomami tribe fight to protect Brazil’s Amazon rainforest from illegal gold mining.

HIMALAYAN DISPUTE: A CNN World multimedia article addressed how herders in a northern Indian community are losing their lands to climate change and border tensions with China.

New science

Frugivores enhance potential carbon recovery in fragmented landscapes
Nature Climate Change

New research found that fruit-eating animals – “frugivores” – play an important role in dispersing the seeds of carbon-dense trees, but this is being put at risk by forest fragmentation. Using ground-based data gathered in the Atlantic forest of Brazil, scientists showed that large fruit-eating birds are responsible for dispersing the seeds of trees with the highest carbon-storing potential, but that the animals are restricted from doing this when tree cover falls below 40%. The restricted movement of large fruit-eating birds has the potential to reduce forest “biomass” – the total weight of plants in a given area – by up to 38%, the researchers estimated. They concluded: “Active restoration (for example, planting trees) is required in more fragmented landscapes to achieve carbon and biodiversity targets.”

Impacts of fire and prospects for recovery in a tropical peat forest ecosystem
Proceedings of the National Academy of Sciences

Fires in tropical peatland forests lead to the proliferation of non-forest vegetation and the erosion of biodiversity – although some affected forests may show “some signs of recovery” after a 12-year period, according to a new study. The researchers tracked ecosystem properties and biodiversity variables in a tropical peatland in Indonesia over 16 years. The analysis showed that most ecosystems and biodiversity are “sensitive to recurrent high-intensity fire”. The paper concluded: “If left uncontrolled, fire may be a pervasive threat to the ecological functioning of tropical forests, underscoring the importance of fire prevention and long-term restoration efforts.”

Emergency policies are not enough to resolve Amazonia’s fire crises
Communications Earth & Environment

Emergency “fire bans” in Brazil – such as those implemented in 2019 – have been “largely ineffective” and must be combined with longer-term strategies to reduce the risks of fire, new research said. Scientists compared the number of observed “fire counts” in the Brazilian Amazon over 2019-21 to the number of expected fires based on climatic conditions. They found that while the 2019 ban did significantly reduce the number of fires, the same intervention was “much less effective” in 2020 and 2021. The authors argued that solving the “fire crisis” will require “target[ing] the underlying causes of fire”, engaging with local communities and building long-term management strategies and education campaigns.

In the diary

Cropped is researched and written by Dr Giuliana Viglione, Aruna Chandrasekhar, Daisy Dunne, Orla Dwyer and Yanine Quiroz. Please send tips and feedback to cropped@carbonbrief.org

The post Cropped 24 April 2024: Mass coral bleaching; FAO report retraction request; Escazú Agreement appeared first on Carbon Brief.

Cropped 24 April 2024: Mass coral bleaching; FAO report retraction request; Escazú Agreement

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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.

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    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

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    Pacific Islands Forum leaders, Albanese must not lose focus on Pacific priorities of climate and ocean

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    KOROR, PALAU, Monday 31 August 2026 — As Pacific leaders gather for the 55th Pacific Islands Forum Leaders Meeting in Palau from today, Greenpeace Australia Pacific is urging Prime Minister Anthony Albanese to stand with Pacific family by keeping Pacific needs at the heart of negotiations, backing longstanding Pacific leadership, supporting Pacific energy sovereignty and ocean custodianship, and holding the line on 1.5°C.

    Against the backdrop of tense geopolitical turmoil, increasingly frequent and lethal extreme weather disasters, the threat of deep sea mining and an energy crisis driven by fossil fuel dependence, the Pacific Islands Forum Leaders Meeting (PIFLM) is a critical moment for Pacific nations to unite with Pacific needs central to regional dialogue.

    The climate crisis, security, the opportunities of renewable energy in the Pacific, ocean protection, and the shifting political landscape will be the focus of the Forum’s discussions.

    Speaking from Palau, Shiva Gounden, Head of Pacific at Greenpeace Australia Pacific, said:
    “The Pacific Islands Forum is the most important multilateral forum in our region, unifying the Pacific under increasingly turbulent global circumstances. We are urging Forum members, including Australia, to not lose focus of Pacific priorities of climate and oceans amid noise and external pressures at this year’s meeting.

    “It is very clear that the greatest security threat to our region is climate change and the only way we can address that is through a just transition away from fossil fuels. Regional cooperation is an antidote to climate chaos and geopolitical tension – together, our region can be guided by Pacific nations’ legacy of leadership from the frontlines of the climate crisis, as we build a more peaceful and secure world.

    “This year’s Forum will set the stage as we build momentum toward COP31 and a Fossil Fuel Free Pacific. Australia must back Pacific energy sovereignty as a solution to the compounding threats facing our region, including soaring costs of living and increasingly lethal extreme weather disasters, and resist the militarisation of our oceans, deep sea mining, and power politics.

    “We must not lose sight of what is needed. The regional adoption of Pacific-led solutions, a Pacific pre-COP with focus on advancing the just transition away from fossil fuels and community-targeted finance for strong and resilient futures beyond fossil fuels must be the foundations of this year’s Forum discussion. What we need now is stronger political will.”

    Also in Palau, Dr Simon Bradshaw, COP31 Lead and climate expert at Greenpeace Australia Pacific, said:
    “Prime Minister Albanese faces a major test of Australia’s climate credibility and Pacific partnership this week. We cannot be a friend to the Pacific and continue to expand fossil fuel production. The best way for Australia to remain the Pacific’s security partner of choice is to act faster on the Pacific’s number one security concern — climate change.

    “The Albanese Government has approved at least five new coal and gas projects since the last Pacific Islands Forum Leaders Meeting, and 36 since being elected, every one of which increases the threats to life, security and sovereignty facing Pacific communities.

    “Nowhere in the world are the dangers of fossil fuels or the benefits of renewable energy clearer than in the Pacific, which faces the double blow of climate disasters and expensive fuel imports.

    “Australia, as incoming President of Negotiations for COP31, has a responsibility to follow the Pacific’s lead, embrace the vision of a resilient Fossil Fuel Free Pacific, and do everything possible to keep 1.5°C alive. Doing so would establish Australia as a highly effective middle power, a force for good in troubled times, and a true ally and partner to the Pacific.”

    —ENDS—

    Greenpeace Australia Pacific has delegates from the Pacific and Australia at the PIFLM in Palau available for interview

    Pacific Islands Forum leaders, Albanese must not lose focus on Pacific priorities of climate and ocean

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