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Tucked on the edges of a biodiversity hotspot, the Tumring project in Cambodia is supposed to prevent a rainforest the size of Chicago from being chopped down.

Its supporters claim it has been doing exceptionally well. The Cambodian government hailed it as the “most successful” community-based forest conservation scheme on the carbon market and a climate solution.

Satellite images tell a different story. Tumring is experiencing dramatic deforestation, losing over 22% of trees in the project area since the scheme began. The Cambodian government does not account for this loss in official monitoring reports.

Nor is this an isolated case. In a joint investigation, Climate Home and Unearthed found similar discrepancies in two Brazilian projects, based on data from two different satellite monitoring platforms. Companies like Uber, ArcelorMittal and Marathon are still using credits from these three projects to offset their emissions – and there is nothing to stop them.

It raises serious questions for Verra, the largest standard setter in the voluntary carbon market, which oversees the projects.

Project owners disputed the findings, while Verra said it “is committed to refining and improving its methodologies based on the best available science and data”.

Mind the gap

By protecting trees the Tumring project generates carbon credits – or offsets – which are then used by polluters to compensate for their own emissions elsewhere. Texan oil firm Marathon is a major buyer, while the Cambodian and Korean governments, project partners, are planning to use a portion of the credits as part of their national net zero plans.

But the emissions avoided through the project are likely to be overstated given the deforestation rate appears to be higher than claimed. Project owners recorded just 3,450 hectares (ha) of forest loss in monitoring reports between 2015 and 2019, the most recent data submitted. Our analysis using the online tool Global Forest Watch showed forest loss was four times higher in that period, at 14,000 ha.

Climate Home and Unearthed looked at offsetting projects after a source raised concerns about apparent discrepancies between what project owners were declaring in their monitoring reports, and what could be seen through satellite images.

The team compared project filings with data developed by the University of Maryland and made available on the Global Forest Watch online platform. A second source of satellite data, Forobs, developed by the European Commission’s Joint Research Centre, was used to check the findings. This showed a similar trend.

Redd+ weaknesses

Verra is a major proponent of the UN-backed scheme Redd+, which stands for “reducing emissions from deforestation and forest degradation in developing countries”. It is designed to protect areas at risk of being deforested. Companies can buy carbon credits from these projects to discount their own emissions.

Critics have long raised concerns about weak quality control of this kind of project. An investigation published by The Guardian and Die Zeit earlier this year alleged more than 90% of Verra’s Redd+ projects were not driving emission reductions, largely because developers exaggerated the threat forests were facing. Verra disputed the findings.

Climate Home and Unearthed found that, in addition to inflated baselines, underreporting of forest loss throughout a project’s lifetime and light-touch regulation can lead to far too many credits being generated.

“The findings point out deep flaws in the forest carbon offset mechanism”, said Souparna Lahiri. The fact deforestation is increasing, instead of going down, “is deeply concerning” and “strengthens our conviction that the mechanism of offsetting cannot be fixed”, he added.

Self-reported deforestation

Each carbon credit represents a ton of CO2 kept from being released into the atmosphere by protecting trees. If a larger portion of forest is cleared than project developers claim, the volume of emissions they avoid will be overstated. When used by companies or governments to compensate for their emissions elsewhere, these credits would have a negative climate impact.

Verra says its role is to make sure that, when a company does invest in a carbon project, it has integrity and meaning, verified by the best standards and science. Monitoring reports are a crucial part of how progress is measured, since they disclose setbacks such as rising deforestation.

Monitoring reports are audited by third parties, then submitted publicly on a project’s page, alongside a host of other documents. In practice, they can be difficult for the public to understand and evaluate. There’s no standardised way to monitor projects.

The way the Cambodian government and its partners monitor deforestation in the Tumring area is opaque. They use national land cover data produced by Cambodia’s environment ministry that is not available publicly. It has a low tree cover threshold, meaning an area needs as little as 10% of trees to be counted as forested. To put it another way, you could chop down 90% of tree cover in a previously untouched section and still claim the forest was intact.

Exposed: carbon offsets linked to high forest loss still on sale

Cambodia has one of the highest deforestation rates in the world, according to Global Forest Watch. Photo: Un Yarat / US Embassy Phnom Penh

The Cambodian government has previously tried to discredit independent analysis showing that deforestation is higher in the country than state records.

Wildlife Works, which worked as a technical consultant for project validation and verification, said it “had no connection to the project” since completing the job and directed questions to the Cambodian government.

The Cambodian government did not respond to a request for comment. The Korean government told Climate Home and Unearthed that only credits from 2021 onwards would be used to offset national emissions.

Industry transparency

The Integrity Council for the Voluntary Carbon Market, an independent governance body for the industry, has called for greater transparency, urging offsetting projects to make all their information accessible to a “non-specialised audience” so a project’s climate impact can be better assessed.

Gilles Dufrasne, from the NGO Carbon Market Watch, said: “Current practice on the market simply isn’t up to standard and this lack of transparency needs to be plugged. More credible, and transparent, use of forest monitoring data is part of this.”

Sylvera, a carbon offsets analytics provider, noted in its 2022 State of Carbon report that the majority of the company’s D-rated projects, of which Tumring is one, “grossly under-reported the deforestation in the project area and have exceeded the baseline emissions”.

Samuel Gill, Sylvera co-founder and president, told Unearthed and Climate Home: “The technology to largely resolve issues like underreporting or overcrediting already exist and are being deployed.” He added: “These improvements take time to filter through the system and in the next few years we should see considerable uplift in project quality as a result.”

In theory, Verra already has various mechanisms to prevent worthless credits linked to deforestation from flooding the market and to punish project developers responsible for any irregularities.

Project owners are required to set aside in a “buffer pool”: a portion of credits that cannot be traded on the market. These act like an insurance policy: if trees meant to be protected end up being felled or burned in a fire, credits in the pool should be cancelled to ensure the integrity of the credits previously sold for offsetting purposes.

Additionally, complaints may trigger a project review and, if a developer is found to have issued too many credits, it can be sanctioned or made to pay a compensation.

But carbon market experts have doubts over the effectiveness of the system, saying the size and use case of buffer pools may be too limited. Only one project has ever had credits from the buffer pool cancelled, according to the Verra register.

Recurring problem

Over 17,000 kilometres away from Tumring, the Rio Preto-Jacundá Redd+ project is meant to achieve the same goal and protect an area of the Brazilian Amazon state of Rondonia.

The project has sold more than one million credits, with big name buyers including German utility Entega, Bank of Santander’s Brazilian arm, and Brazilian financial services giant Banco Bradesco.

From when it began in 2012 to 2020, the latest year available in monitoring reports, the project recorded 5,884 ha of loss, with a sharp increase from 2016. Global Forest Watch data shows it lost 8,200 ha of forest – 33% higher than the numbers declared by the project owner, Biofílica Ambipar.

The scheme’s “without project” scenario, to show what would happen under business as usual, predicted 9,922 ha of loss in the same period.

‘On watch’

Sylvera, an offsetting rating agency that independently checks and verifies projects using a combination of satellite imagery and machine learning, has placed the Rio Preto project “on watch”, after noting significant and increasing deforestation within the project area.

Biofílica Ambipar, which runs the Rio Preto scheme, said it “works continuously to monitor, identify and report any illegal activity to the Brazilian public environmental authorities”.

The company says it relies on the Prodes system to monitor forest loss in the area. Created by the National Institute for Space Research in 1988, Prodes is also used by the Brazilian government for its official annual deforestation reports.

“According to the Prodes system, the deforestation rates in the region are lower than those informed by Global Forest Watch, which is not as accurate in classifying deforestation,” Biofílica Ambipar said.

Prodes is used to detect large-scale changes in primary forest, but it can miss smaller changes. The system uses satellite images that only detect clearcut logging of more than 6.25 hectares – an area equivalent to nearly nine football pitches – missing smaller-scale forest loss. The University of Maryland data, made available through Global Forest Watch, captures losses as small as 0.1 hectares, while also picking up forest degradation.

Still selling credits

Another Biofílica project was abruptly cancelled last year after part of it was legally deforested by the landowner. But carbon credits generated by the scheme are still on the market.

The Maísa project covered over 25,000 hectares of forest in the state of Pará controlled by a family-owned agroindustrial company, which runs eucalyptus, Brazil nuts and açaí plantations.

When the project began in 2012, the firm agreed with Biofílica to protect the trees and invest in better forest management practices in exchange for a share of the profits from the sale of carbon credits.

Since then, polluters including steel giant ArcelorMittal have bought hundreds of thousands of its credits.

But starting from last year the landowner began clearing increasingly larger areas of the forest in what Biofílica says was a breach of their agreement.

The project developer decided to stop the project, but it is still listed on the Verra register and its credits continue to be used for offsetting purposes. Over 38,000 credits have been retired since the project was stopped by Biofilica – more than 4,000 of them purchased by Uber to compensate for the emissions spewed by its fleet of cars in Central and South America.

Uber said that it “only invests in projects certified, traceable, and auditable by Verra, the United Nations, Gold Standard, and Climate Action Reserve [other verifying bodies for offsetting schemes] after a thorough investigation”.

Lure of agribusiness

Biofílica told Unearthed and Climate Home that the company had made it a policy to stop selling credits from the Maísa project as soon as it became aware of the legal logging. It added that “the project is currently in the process of being terminated and audited in line with Verra procedures.”

Asked what would happen to old credits in the project that are still available on the market through third-party sellers, Biofílica’s spokesperson said: “It is important to highlight that the credits that are still being sold by traders and brokers refer to credits verified in previous years, when there was still no legal deforestation scenario in the area; that is, they were audited and verified credits.”

However, when trees are cut down, the carbon stored in them is released back into the atmosphere, no matter if they were originally protected, negating any potential climate benefit. Experts say good projects need to ensure the carbon they sequester or avoid will remain out of the atmosphere for at least 100 years.

When asked what happens to credits in projects that are cancelled, a Verra spokesperson said projects are required to deposit a percentage of their credits into buffer pools which can be drawn on if a portion of the forest is lost.

Maísa’s buffer pool contains 131,600 credits which have currently been placed on hold, meaning Verra still needs to decide their fate. That is only 20% of the total credits put on the market for offsetting purposes, most of which have already been used.

Biofílica spokesperson suggested that what happened with the Maísa project was a sign that Redd+ projects can struggle to compete with the economic opportunities offered by agricultural production in the Amazon.

They said: “Maísa shows the reality of the Amazon region and illustrates the difficulties that all actors interested in conservation face in making carbon projects financially viable.”

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The 2026 budget test: Will Australia break free from fossil fuels?

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In 2026, the dangers of fossil fuel dependence have been laid bare like never before. The illegal invasion of Iran has brought pain and destruction to millions across the Middle East and triggered a global energy crisis impacting us all. Communities in the Pacific have been hit especially hard by rising fuel prices, and Australians have seen their cost-of-living woes deepen.

Such moments of crisis and upheaval can lead to positive transformation. But only when leaders act with courage and foresight.

There is no clearer statement of a government’s plans and priorities for the nation than its budget — how it plans to raise money, and what services, communities, and industries it will invest in.

As we count down the days to the 2026-27 Federal Budget, will the Albanese Government deliver a budget for our times? One that starts breaking the shackles of fossil fuels, accelerates the shift to clean energy, protects nature, and sees us work together with other countries towards a safer future for all? Or one that doubles down on coal and gas, locks in more climate chaos, and keeps us beholden to the whims of tyrants and billionaires.

Here’s what we think the moment demands, and what we’ll be looking out for when Treasurer Jim Chalmers steps up to the dispatch box on 12 May.

1. Stop fuelling the fire
2. Make big polluters pay
3. Support everyone to be part of the solution
4. Build the industries of the future
5. Build community resilience
6. Be a better neighbour
7. Protect nature

1. Stop fuelling the fire

Action Calls for a Transition Away From Fossil Fuels in Vanuatu. © Greenpeace
The community in Mele, Vanuatu sent a positive message ahead of the First Conference on Transitioning Away from Fossil Fuels. © Greenpeace

In mid-April, Pacific governments and civil society met to redouble their efforts towards a Fossil Fuel Free Pacific. Moving beyond coal, oil and gas is fundamental to limiting warming to 1.5°C — a survival line for vulnerable communities and ecosystems. And as our Head of Pacific, Shiva Gounden, explained, it is “also a path of liberation that frees us from expensive, extractive and polluting fossil fuel imports and uplifts our communities”.

Pacific countries are at the forefront of growing global momentum towards a just transition away from fossil fuels, and it is way past time for Australia to get with the program. It is no longer a question of whether fossil fuel extraction will end, but whether that end will be appropriately managed and see communities supported through the transition, or whether it will be chaotic and disruptive.

So will this budget support the transition away from fossil fuels, or will it continue to prop up coal and gas?

When it comes to sensible moves the government can make right now, one stands out as a genuine low hanging fruit. Mining companies get a full rebate of the excise (or tax) that the rest of us pay on diesel fuel. This lowers their operating costs and acts as a large, ongoing subsidy on fossil fuel production — to the tune of $11 billion a year!

Greenpeace has long called for coal and gas companies to be removed from this outdated scheme, and for the billions in savings to be used to support the clean energy transition and to assist communities with adapting to the impacts of climate change. Will we see the government finally make this long overdue change, or will it once again cave to the fossil fuel lobby?

2. Make big polluters pay

Activists Disrupt Major Gas Conference in Sydney. © Greenpeace
Greenpeace Australia Pacific activists disrupted the Australian Domestic Gas Outlook conference in Sydney with the message ‘Gas execs profit, we pay the price’. © Greenpeace

While our communities continue to suffer the escalating costs of climate-fuelled disasters, our Government continues to support a massive expansion of Australia’s export gas industry. Gas is a dangerous fossil fuel, with every tonne of Australian gas adding to the global heating that endangers us all.

Moreover, companies like Santos and Woodside pay very little tax for the privilege of digging up and selling Australians’ natural endowment of fossil gas. Remarkably, the Government currently raises more tax from beer than from the Petroleum Resource Rent Tax (PRRT) — the main tax on gas profits.

Momentum has been building to replace or supplement the PRRT with a 25% tax on gas exports. This could raise up to $17 billion a year — funds that, like savings from removing the diesel tax rebate for coal and gas companies, could be spent on supporting the clean energy transition and assisting communities with adapting to worsening fires, floods, heatwaves and other impacts of climate change.

As politicians arrive in Canberra for budget week, they will be confronted by billboards calling for a fair tax on gas exports. The push now has the support of dozens of organisations and a growing number of politicians. Let’s hope the Treasurer seizes this rare window for reform.

3. Support everyone to be part of the solution

As the price of petrol and diesel rises, electric vehicles (EVs) are helping people cut fuel use and save money. However, while EV sales have jumped since the invasion of Iran sent fuel prices rising, they still only make up a fraction of total new car sales. This budget should help more Australians switch to electric vehicles and, even more importantly, enable more Australians to get around by bike, on foot, and on public transport. This means maintaining the EV discount, investing in public and active transport, and removing tax breaks for fuel-hungry utes and vans.

Millions of Australians already enjoy the cost-saving benefits of rooftop solar, batteries, and getting off gas. This budget should enable more households, and in particular those on lower incomes, to access these benefits. This means maintaining the Cheaper Home Batteries Program, and building on the Household Energy Upgrades Fund.

4. Build the industries of the future

Protest of Woodside and Drill Rig Valaris at Scarborough Gas Field in Western Australia. © Greenpeace / Jimmy Emms
Crew aboard Greenpeace Australia Pacific’s campaigning vessel the Oceania conducted a peaceful banner protest at the site of the Valaris DPS-1, the drill rig commissioned to build Woodside’s destructive Burrup Hub. © Greenpeace / Jimmy Emms

If we’re to transition away from fossil fuels, we need to be building the clean industries of the future.

No state is more pivotal to Australia’s energy and industrial transformation than Western Australia. The state has unrivaled potential for renewable energy development and for replacing fossil fuel exports with clean exports like green iron. Such industries offer Western Australia the promise of a vibrant economic future, and for Australia to play an outsized positive role in the world’s efforts to reduce emissions.

However, realising this potential will require focussed support from the Federal Government. Among other measures, Greenpeace has recommended establishing the Australasian Green Iron Corporation as a joint venture between the Australian and Western Australian governments, a key trading partner, a major iron ore miner and steel makers. This would unite these central players around the complex task of building a large-scale green iron industry, and unleash Western Australia’s potential as a green industrial powerhouse.

5. Build community resilience

Believe it or not, our Government continues to spend far more on subsidising fossil fuel production — and on clearing up after climate-fuelled disasters — than it does on helping communities and industries reduce disaster costs through practical, proven methods for building their resilience.

Last year, the Government estimated that the cost of recovery from disasters like the devastating 2022 east coast floods on 2019-20 fires will rise to $13.5 billion. For contrast, the Government’s Disaster Ready Fund – the main national source of funding for disaster resilience – invests just $200 million a year in grants to support disaster preparedness and resilience building. This is despite the Government’s own National Emergency Management Agency (NEMA) estimating that for every dollar spent on disaster risk reduction, there is a $9.60 return on investment.

By redirecting funds currently spent on subsidising fossil fuel production, the Government can both stop incentivising climate destruction in the first place, and ensure that Australian communities and industries are better protected from worsening climate extremes.

No communities have more to lose from climate damage, or carry more knowledge of practical solutions, than Aboriginal and Torres Strait Islander peoples. The budget should include a dedicated First Nations climate adaptation fund, ensuring First Nations communities can develop solutions on their own terms, and access the support they need with adapting to extreme heat, coastal erosion and other escalating challenges.

6. Be a better neighbour

The global response to climate change depends on the adequate flow of support from developed economies like Australia to lower income nations with shifting to clean energy, adapting to the impacts of climate change, and addressing loss and damage.

Such support is vital to building trust and cooperation, reducing global emissions, and supporting regional and global security by enabling countries to transition away from fossil fuels and build greater resilience.

Despite its central leadership role in this year’s global climate negotiations, our Government is yet to announce its contribution to international climate finance for 2025-2030. Greenpeace recommends a commitment of $11 billion for this five year period, which is aligned with the global goal under the Paris Agreement to triple international climate finance from current levels.
This new commitment should include additional funding to address loss and damage from climate change and a substantial contribution to the Pacific Resilience Facility, ensuring support is accessible to countries and communities that need it most. It should also see Australia get firmly behind the vision of a Fossil Fuel Free Pacific.

7. Protect nature

Rainforest in Tasmania. © Markus Mauthe / Greenpeace
Rainforest of north west Tasmania in the Takayna (Tarkine) region. © Markus Mauthe / Greenpeace

There is no safe planet without protection of the ecosystems and biodiversity that sustain us and regulate our climate.

Last year the Parliament passed important and long overdue reforms to our national environment laws to ensure better protection for our forests and other critical ecosystems. However, the Government will need to provide sufficient funding to ensure the effective implementation of these reforms.

Greenpeace has recommended $500 million over four years to establish the National Environment Agency — the body responsible for enforcing and monitoring the new laws — and a further $50 million to Environment Information Australia for providing critical information and tools.

Further resourcing will also be required to fulfil the crucial goal of fully protecting 30% of Australian land and seas by 2030. This should include $1 billion towards ending deforestation by enabling farmers and loggers to retool away from destructive practices, $2 billion a year for restoring degraded lands, $5 billion for purchasing and creating new protected areas, and $200 million for expanding domestic and international marine protected areas.

Conclusion

This is not the first time that conflict overseas has triggered an energy crisis, or that a budget has been preceded by a summer of extreme weather disasters, highlighting the urgent need to phase out fossil fuels. What’s different in 2026 is the availability of solutions. Renewable energy is now cheaper and more accessible than ever before. Global momentum is firmly behind the transition away from fossil fuels. The Albanese Government, with its overwhelming majority, has the chance to set our nation up for the future, or keep us stranded in the past. Let’s hope it makes some smart choices.

The 2026 budget test: Will Australia break free from fossil fuels?

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What fossil fuels really cost us in a world at war

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Anne Jellema is Executive Director of 350.org.

The war on Iran and Lebanon is a deeply unjust and devastating conflict, killing civilians at home, destroying lives, and at the same time sending shockwaves through the global economy. We, at 350.org, have calculated, drawing on price forecasts from the International Monetary Fund (IMF) and Goldman Sachs, just how much that volatility is costing us. 

Even under the IMF’s baseline scenario – a de facto “best case” scenario with a near-term end to the war and related supply chain disruptions – oil and gas price spikes are projected to cost households and businesses globally more than $600 billion by the end of the year. Under the IMF’s “adverse scenario”, with prolonged conflict and sustained price pressures, we estimate those additional costs could exceed $1 trillion, even after accounting for reduced demand.

Which is why we urgently need a power shift. Governments are under growing pressure to respond to rising fuel and food costs and deepening energy poverty. And it’s becoming clearer to both voters and elected officials that fossil dependence is not only expensive and risky, but unnecessary. 

People who can are voting with their wallets: sales of solar panels and electric vehicles are increasing sharply in many countries. But the working people who have nothing to spare, ironically, are the ones stuck with using oil and gas that is either exorbitantly expensive or simply impossible to get.

Drain on households and economies

In India, street food vendors can’t get cooking gas and in the Philippines, fishermen can’t afford to take their boats to sea. A quarter of British people say that rising energy tariffs will leave them completely unable to pay their bills. This is the moment for a global push to bring abundant and affordable clean energy to all.

In April, we released Out of Pocket, our new research report on how fossil fuels are draining households and economies. We were surprised by the scale of what we found. For decades, governments have reassured people that energy price spikes are unfortunate but unavoidable – the result of distant conflicts, market forces or geopolitical shocks beyond anyone’s control. But the numbers tell a different story. 

    What we are living through today is not an energy crisis. It is a fossil fuel crisis. In just the first 50 days of the Middle East conflict, soaring oil and gas prices have siphoned an estimated $158 billion–$166 billion from households and businesses worldwide. That is money extracted directly from people’s pockets and transferred, almost instantly, into fossil fuel company balance sheets. And this figure only captures the immediate impact of price spikes, not the permanent economic drain of fossil dependence. Fossil fuels don’t just cost us once, they cost us over and over again.

    First, through our bills. Every time there is a war, an embargo or a supply disruption, fossil fuel prices surge. For ordinary people, this means higher costs for energy, transport and food. Many Global South countries have little or no fiscal space to buffer the shock; instead, workers and families pay the price.

    Second, through our taxes. Governments around the world continue to pour vast sums of public money into fossil fuel subsidies. These are often justified as a way to protect the most vulnerable at the petrol pump or in their homes. But in reality, the benefits are overwhelmingly captured by wealthier households and corporations. The poorest 20% receive just a fraction of this support, while public finances are drained.

    Third, through climate impacts. New research across more than 24,000 global locations gives a granular account of the true costs of extreme heat, sea level rise and falling agricultural yields. Using this data to update IMF modelling of the social cost of carbon, we found that fossil fuel impacts on health and livelihoods amount to over $9 trillion a year. This is the biggest subsidy of all, because these massive and mounting costs are not charged to Big Oil – they are paid for by governments and households, with the poorest shouldering the lion’s share. 

    Massive transfer of wealth to fossil fuel industry

    Adding up direct subsidies, tax breaks and the unpaid bill for climate damages, the total transfer of wealth from the public to the fossil fuel industry amounts to $12 trillion even in a “normal” year without a global oil shock. That’s more than 50% higher than the IMF has previously estimated, and equivalent to a staggering $23 million a minute.

    The fossil fuel industry has become extraordinarily adept at profiting from instability. When conflict drives up prices, companies do not lose, they gain. In the current crisis, oil producers and commodity traders are on track to secure tens of billions of dollars in additional windfall profits, even as households face rising bills and governments struggle to manage the fallout.

    Fossil fuel crisis offers chance to speed up energy transition, ministers say

    This growing disconnect is impossible to ignore. Investors are advised to buy into fossil fuel firms precisely because of their ability to generate profits in times of crisis. Meanwhile, ordinary people are told to tighten their belts.

    In 2026, unlike during the oil shocks of the 1970s, clean energy is no longer a distant alternative. Now, even more than when gas prices spiked due to Russia’s invasion of Ukraine in 2022, renewables are often the cheapest option available. Solar and wind can be deployed quickly, at scale, and without the volatility that defines fossil fuel markets.

    How to transition from dirty to clean energy

    The solutions are clear. Governments must implement permanent windfall taxes on fossil fuel companies to ensure that extraordinary profits generated during crises are redirected to support households. These revenues can be used to reduce energy bills, invest in public services, and accelerate the rollout of clean energy.

    Second, we must shift subsidies away from fossil fuels and towards renewable solutions, particularly those that can be deployed quickly and equitably, such as rooftop and community solar. This is not just about cutting emissions. It is about building a more stable, fair and resilient energy system.

    Finally, we need binding plans to phase out fossil fuels altogether, replacing them with homegrown renewable energy that can shield economies from future shocks. Because what the current crisis has made clear is this: as long as we remain dependent on fossil fuels, we remain vulnerable – to conflict, to price volatility and to the escalating impacts of climate change.

    The true price of fossil fuels is no longer hidden. It is visible in rising bills, strained public finances and communities pushed to the brink. And it is being paid, every day, by ordinary people around the world.

    It’s time for the great power shift

    Full details on the methodology used for this report are available here.

    The Great Power Shift is a new campaign by 350.org global campaign to pressure governments to bring down energy bills for good by ending fossil fuel dependence and investing in clean, affordable energy for all

    Logo of 350.org campaign on “The Great Power Shift”

    Logo of 350.org campaign on “The Great Power Shift”

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    Traditional models still ‘outperform AI’ for extreme weather forecasts

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    Computer models that use artificial intelligence (AI) cannot forecast record-breaking weather as well as traditional climate models, according to a new study.

    It is well established that AI climate models have surpassed traditional, physics-based climate models for some aspects of weather forecasting.

    However, new research published in Science Advances finds that AI models still “underperform” in forecasting record-breaking extreme weather events.

    The authors tested how well both AI and traditional weather models could simulate thousands of record-breaking hot, cold and windy events that were recorded in 2018 and 2020.

    They find that AI models underestimate both the frequency and intensity of record-breaking events.

    A study author tells Carbon Brief that the analysis is a “warning shot” against replacing traditional models with AI models for weather forecasting “too quickly”.

    AI weather forecasts

    Extreme weather events, such as floods, heatwaves and storms, drive hundreds of billions of dollars in damages every year through the destruction of cropland, impacts on infrastructure and the loss of human life.

    Many governments have developed early warning systems to prepare the general public and mobilise disaster response teams for imminent extreme weather events. These systems have been shown to minimise damages and save lives.

    For decades, scientists have used numerical weather prediction models to simulate the weather days, or weeks, in advance.

    These models rely on a series of complex equations that reproduce processes in the atmosphere and ocean. The equations are rooted in fundamental laws of physics, based on decades of research by climate scientists. As a result, these models are referred to as “physics-based” models.

    However, AI-based climate models are gaining popularity as an alternative for weather forecasting.

    Instead of using physics, these models use a statistical approach. Scientists present AI models with a large batch of historical weather data, known as training data, which teaches the model to recognise patterns and make predictions.

    To produce a new forecast, the AI model draws on this bank of knowledge and follows the patterns that it knows.

    There are many advantages to AI weather forecasts. For example, they use less computing power than physics-based models, because they do not have to run thousands of mathematical equations.

    Furthermore, many AI models have been found to perform better than traditional physics-based models at weather forecasts.

    However, these models also have drawbacks.

    Study author Prof Sebastian Engelke, a professor at the research institute for statistics and information science at the University of Geneva, tells Carbon Brief that AI models “depend strongly on the training data” and are “relatively constrained to the range of this dataset”.

    In other words, AI models struggle to simulate brand new weather patterns, instead tending forecast events of a similar strength to those seen before. As a result, it is unclear whether AI models can simulate unprecedented, record-breaking extreme events that, by definition, have never been seen before.

    Record-breaking extremes

    Extreme weather events are becoming more intense and frequent as the climate warms. Record-shattering extremes – those that break existing records by large margins – are also becoming more regular.

    For example, during a 2021 heatwave in north-western US and Canada, local temperature records were broken by up to 5C. According to one study, the heatwave would have been “impossible” without human-caused climate change.

    The new study explores how accurately AI and physics-based models can forecast such record-breaking extremes.

    First, the authors identified every heat, cold and wind event in 2018 and 2020 that broke a record previously set between 1979 and 2017. (They chose these years due to data availability.) The authors use ERA5 reanalysis data to identify these records.

    This produced a large sample size of record-breaking events. For the year 2020, the authors identified around 160,000 heat, 33,000 cold and 53,000 wind records, spread across different seasons and world regions.

    For their traditional, physics-based model, the authors selected the High RESolution forecast model from the Integrated Forecasting System of the European Centre for Medium-­Range Weather Forecasts. This is “widely considered as the leading physics-­based numerical weather prediction model”, according to the paper.

    They also selected three “leading” AI weather models – the GraphCast model from Google Deepmind, Pangu-­Weather developed by Huawei Cloud and the Fuxi model, developed by a team from Shanghai.

    The authors then assessed how accurately each model could forecast the extremes observed in the year 2020.

    Dr Zhongwei Zhang is the lead author on the study and a researcher at Karlsruhe Institute of Technology. He tells Carbon Brief that many AI weather forecast models were built for “general weather conditions”, as they use all historical weather data to train the models. Meanwhile, forecasting extremes is considered a “secondary task” by the models.

    The authors explored a range of different “lead times” – in other words, how far into the future the model is forecasting. For example, a lead time of two days could mean the model uses the weather conditions at midnight on 1 January to simulate weather conditions at midnight on 3 January.

    The plot below shows how accurately the models forecasted all extreme events (left) and heat extremes (right) under different lead times. This is measured using “root mean square error” – a metric of how accurate a model is, where a lower value indicates lower error and higher accuracy.

    The chart on the left shows how two of the AI models (blue and green) performed better than the physics-based model (black) when forecasting all weather across the year 2020.

    However, the chart on the right illustrates how the physics-based model (black) performed better than all three AI models (blue, red and green) when it came to forecasting heat extremes.

    Accuracy of the AI models
    Accuracy of the AI models (blue, red and green) and the physics-based model (black) at forecasting all weather over 2020 (left) and heat extremes (right) over a range of lead times. This is measured using “root mean square error” (RMSE) – a metric of how accurate a model is, where a lower value indicates lower error and higher accuracy. Source: Zhang et al (2026).

    The authors note that the performance gap between AI and physics-based models is widest for lower lead times, indicating that AI models have greater difficulty making predictions in the near future.

    They find similar results for cold and wind records.

    In addition, the authors find that AI models generally “underpredict” temperature during heat records and “overpredict” during cold records.

    The study finds that the larger the margin that the record is broken by, the less well the AI model predicts the intensity of the event.

    ‘Warning shot’

    Study author Prof Erich Fischer is a climate scientist at ETH Zurich and a Carbon Brief contributing editor. He tells Carbon Brief that the result is “not unexpected”.

    He adds that the analysis is a “warning shot” against replacing traditional models with AI models for weather forecasting “too quickly”.

    The analysis, he continues, is a “warning shot” against replacing traditional models with AI models for weather forecasting “too quickly”.

    AI models are likely to continue to improve, but scientists should “not yet” fully replace traditional forecasting models with AI ones, according to Fischer.

    He explains that accurate forecasts are “most needed” in the runup to potential record-breaking extremes, because they are the trigger for early warning systems that help minimise damages caused by extreme weather.

    Leonardo Olivetti is a PhD student at Uppsala University, who has published work on AI weather forecasting and was not involved in the study.

    He tells Carbon Brief that “many other studies” have identified issues with using AI models for “extremes”, but this paper is novel for its specific focus on extremes.

    Olivetti notes that AI models are already used alongside physics-based models at “some of the major weather forecasting centres around the world”. However, the study results suggest “caution against relying too heavily on these [AI] models”, he says.

    Prof Martin Schultz, a professor in computational earth system science at the University of Cologne who was not involved in the study, tells Carbon Brief that the results of the analysis are “very interesting, but not too surprising”.

    He adds that the study “justifies the continued use of classical numerical weather models in operational forecasts, in spite of their tremendous computational costs”.

    Advances in forecasting

    The field of AI weather forecasting is evolving rapidly.

    Olivetti notes that the three AI models tested in the study are an “older generation” of AI models. In the last two years, newer “probabilistic” forecast models have emerged that “claim to better capture extremes”, he explains.

    The three AI models used in the analysis are “deterministic”, meaning that they only simulate one possible future outcome.

    In contrast, study author Engelke tells Carbon Brief that probabilistic models “create several possible future states of the weather” and are therefore more likely to capture record-breaking extremes.

    Engelke says it is “important” to evaluate the newer generation of models for their ability to forecast weather extremes.

    He adds that this paper has set out a “protocol” for testing the ability of AI models to predict unprecedented extreme events, which he hopes other researchers will go on to use.

    The study says that another “promising direction” for future research is to develop models that combine aspects of traditional, physics-based weather forecasts with AI models.

    Engelke says this approach would be “best of both worlds”, as it would combine the ability of physics-based models to simulate record-breaking weather with the computational efficiency of AI models.

    Dr Kyle Hilburn, a research scientist at Colorado State University, notes that the study does not address extreme rainfall, which he says “presents challenges for both modelling and observing”. This, he says, is an “important” area for future research.

    The post Traditional models still ‘outperform AI’ for extreme weather forecasts appeared first on Carbon Brief.

    Traditional models still ‘outperform AI’ for extreme weather forecasts

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