The world’s most biodiverse nation, Brazil, has belatedly published its UN plan for halting and reversing nature decline by the end of this decade.
Brazil is home to 10-15% of all known species on Earth, 64% of the Amazon rainforest and it supplies 10% of global food demand, according to official estimates.
It was among around 85% of nations to miss the 2024 deadline for submitting a new UN nature plan, known as a national biodiversity strategy and action plan (NBSAP), according to a joint investigation by Carbon Brief and the Guardian.
On 29 December 2025, Brazil finally published its new NBSAP, following a lengthy consultation process involving hundreds of scientists, Indigenous peoples and civil society members.
The NBSAP details how the country will meet the goals and targets of the Kunming-Montreal Global Biodiversity Framework (GBF), the landmark deal often described as the “Paris Agreement” for nature, agreed in 2022.
Below, Carbon Brief walks through six key takeaways from Brazil’s belated NBSAP:
- The government plans to ‘conserve’ 80% of the Brazilian Amazon by 2030
- It plans to ‘eliminate’ deforestation in Brazilian ecosystems by 2030
- Brazil has ‘aligned’ its actions on tackling climate change and biodiversity loss
- The country seeks to ‘substantially increase’ nature finance from a range of sources
- Brazil’s plans for agriculture include ‘sustainable intensification’
- Brazil conducted a largest-of-its-kind consultation process before releasing its NBSAP
The government plans to ‘conserve’ 80% of the Brazilian Amazon by 2030
The third target of the GBF sets out the aim that “by 2030 at least 30% of terrestrial, inland water and of coastal and marine areas…are effectively conserved and managed”. This is often referred to as “30 by 30”.
Previous analysis by Carbon Brief and the Guardian found that more than half of countries’ pledges were not aligned with this aim. (Importantly, all of the GBF’s targets are global ones and do not prescribe the amount of land that each country must protect.)
Brazil’s NBSAP sets a substantially higher goal – it seeks to conserve 80% of the Amazon rainforest within its borders, as well as 30% of the country’s other ecosystems.
Since Brazil is one of the largest countries in the world, in addition to being the most biodiverse, this higher target represents a significant step towards achieving the global target.
For the purposes of its protected areas target, Brazil considers not just nationally designated protected areas, but also the lands of Indigenous peoples, Quilombola territories and other local communities.
As the NBSAP notes, Brazil has already taken several steps towards achieving the “30 by 30” target.
In 2018, the country created or expanded four marine protected areas in its territorial waters, increasing its protected area coverage from around 1.5% to greater than 25%.
According to Brazil’s sixth national report, submitted to the CBD in 2020, 18% of the country’s “continental area” – that is, its land and inland waters – was part of a protected area. More than 28% of the Amazon received such a designation.
A further 12% of the country is demarcated as Indigenous lands, which “provide important protection to a large territorial extension of the country, particularly in the Amazon biome”, the report says.
The action plan that accompanies the new NBSAP sets out 15 actions in support of achieving target three, including recognising and titling Indigenous lands, establishing ecological corridors and biosphere reserves and implementing national strategies for mangrove, coral reef and wetlands protection.
It plans to ‘eliminate’ deforestation in Brazilian ecosystems by 2030
As well as committing to the GBF targets of protecting and restoring ecosystems, Brazil’s NBSAP also sets a separate target to “eliminate” deforestation in Brazilian biomes by 2030.
Target 1B of Brazil’s NBSAP says that the country aims to “achieve zero deforestation and conversion of native vegetation by 2030”.
The country hopes to achieve this “through the elimination of illegal deforestation and conversion, compensation for the legal suppression of native vegetation, prevention and control of wildfires, combating desertification and attaining land degradation neutrality”.
This goes above and beyond what is set out in the GBF, which does not mention “deforestation” at all.
Brazilian president Luiz Inácio Lula da Silva was reelected as leader in 2022 on a promise to achieve “zero deforestation”, following a rise in Amazon destruction under his predecessor, Jair Bolsonaro.
Data from Global Forest Watch (GFW), an independent satellite research platform, found that deforestation in the Brazilian Amazon fell by a “dramatic” 36% in 2023 under Lula.
However, Brazil remains the world’s largest deforester. Separate GFW data shows that the country accounted for 42% of all primary forest loss in 2024 – with two-thirds of this driven by wildfires fuelled by a record drought.
Brazil has ‘aligned’ its actions on tackling climate change and biodiversity loss
Brazil’s NBSAP comes shortly after it hosted the COP30 climate summit in the Amazon city of Belém in November.
One of the presidency’s priorities at the talks was to bring about greater coordination between global efforts to tackle climate change and biodiversity loss.
At the Rio Earth summit in 1992, the world decided to address Earth’s most pressing environmental problems under three separate conventions: one on climate change, one on biodiversity and the final one on land desertification.
But, for the past few years, a growing number of scientists, politicians and diplomats have questioned whether tackling these issues separately is the right approach.
And, at the most recent biodiversity and land desertification COPs, countries agreed to new texts calling for closer cooperation between the three Rio conventions.
At COP30, the Brazilian presidency attempted to negotiate a new text to enhance “synergies” between the conventions. However, several nations, including Saudi Arabia, vocally opposed the progression of a substantive outcome.
Following on from this, Brazil’s NBSAP states that its vision for tackling nature loss is “aligned” with its UN climate plan, known as a nationally determined contribution (NDC).
In addition, the NBSAP states that Brazil is taking a “holistic approach to addressing the existing crises of climate change and biodiversity loss in a synergistic manner”.
It lists several targets that could help to address both environmental problems, including ending deforestation, promoting sustainable agriculture and restoring ecosystems.
Brazil joins a small number of countries, including Panama and the UK, that have taken steps to bring their actions to tackle climate change and biodiversity loss into alignment.
The country seeks to ‘substantially increase’ nature finance from a range of sources
According to target 19 of the NBSAP, the Brazilian government will “develop and initiate” a national strategy to finance the actions laid out in the document by the end of 2026.
This financial plan “should aim to substantially increase…the volume of financial resources” for implementing the NBSAP.
These resources should come in the form of federal, state and municipal funding, international finance, private funding and incentives for preserving biodiversity, the document continues.
The accompanying action plan includes a number of specific mechanisms, which could be used to finance efforts to tackle nature loss. These include biodiversity credits, a regulated carbon market and the Tropical Forest Forever Facility.
Separately, the NBSAP sets out a goal in target 18 of identifying “subsidies and economic and fiscal incentives that are directly harmful to biodiversity” by the end of this year. Those identified subsidies should then be reduced or eliminated by 2030, it adds.
The document notes that the phaseout of harmful subsidies should be accompanied by an increase in incentives for “conservation, restoration and sustainable use of biodiversity”.
The NBSAP does “important work” in translating the targets of the GBF into “ambitious targets” in the national context, says Oscar Soria, co-founder and chief executive of civil-society organisation the Common Initiative.
Soria tells Carbon Brief:
“While the document is laudable on many aspects and its implementation would change things for the better, the concrete financial means to make it a reality – funding it and halting the funding of activities going against it – are still lacking. In this regard, this NBSAP is a good example of the GBF’s problem at the global level.
“The hardest part of political negotiations will begin only now: in 2026, the Brazilian government will have to evaluate the cost of implementing the NBSAP and where finance will come from.”
Brazil’s plans for agriculture include ‘sustainable intensification’
Brazil is one of the world’s leading food producers, meeting 10% of global demand, according to its NBSAP.
It is also the world’s largest grower of soya beans and the second-largest cattle producer.
However, agriculture is also a major driver of biodiversity loss in Brazil, largely due to the clearing of rainforest or other lands for soya growing and cattle ranching. Agriculture itself is also affected by biodiversity loss, particularly the loss of pollinators. The NBSAP says:
“Biodiversity loss directly undermines agricultural production and human well-being, demonstrating that agriculture, other productive activities and biodiversity conservation are interdependent rather than antagonistic.”
Brazil’s NBSAP addresses sustainable agriculture in target 10A, which aims to “ensure that, by 2030, areas under agriculture, livestock, aquaculture and forestry are managed sustainably and integrated into the landscape”.
It lists several approaches to achieving sustainable production, including agroecology, regenerative agriculture and sustainable intensification.
Targets seven and 10B also pertain to food systems. Target seven seeks to reduce the impacts of pollution, including nutrient loss and pesticides, on biodiversity, while target 10B commits to the sustainable fishing and harvesting of other aquatic resources.
In 2021, Brazil launched its national low-carbon agriculture strategy, known as the ABC+ plan. The plan promotes sustainability in the agricultural sector through both adaptation and mitigation actions.
Brazil conducted a largest-of-its-kind consultation process before releasing its NBSAP
Brazil was among the majority of nations to miss the UN deadline to submit a new NBSAP before the COP16 biodiversity summit in Colombia in October 2024.
At the time, a representative from the Brazilian government said that it was unable to meet the deadline because it was embarking on an ambitious consultation process for its NBSAP.
Braulio Dias, director of biodiversity conservation at the Brazilian Ministry of Environment, who is responsible for the NBSAP process, told Carbon Brief and the Guardian in 2024:
“Brazil is a huge country with the largest share of biodiversity [and] a large population with a complex governance. We are a federation with 26 states and 5,570 municipalities. We started the process to update our NBSAP in May last year and have managed to conclude a broad consultation process involving over a thousand people in face-to-face meetings.
“We are in the process of consolidating all proposals received, consulting all the departments of the Brazilian Ministry of the Environment and Climate Change, all the federal ministries and agencies engaged in the biodiversity agenda and the National Biodiversity Committee, before we can have a high-level political endorsement.
“Then we still have to build a monitoring strategy, a finance strategy and a communication strategy. We will only conclude this process toward the end of the year or early next year.”
In its NBSAP, the Brazilian government says it engaged with around 200 scientific and civil society organisations and 110 Indigenous representatives while preparing its NBSAP.
Around one-third of the Amazon is protected by Indigenous territories.
Indigenous peoples in Brazil have continuously called for more inclusion in UN processes to tackle climate change and nature loss, including by holding multiple demonstrations during the COP30 climate summit in November.
Michel Santos, public policy manager at WWF Brazil, says that many in Brazil’s civil society were pleased with the NBSAP’s extensive consultation process, telling Carbon Brief:
“Brazilian civil society is very happy with everything. It was a long process with broad participation. It took a while to be completed, but we consider the result quite satisfactory.”
The post Brazil’s biodiversity pledge: Six key takeaways for nature and climate change appeared first on Carbon Brief.
Brazil’s biodiversity pledge: Six key takeaways for nature and climate change
Climate Change
The 2026 budget test: Will Australia break free from fossil fuels?
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

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

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

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

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?
Climate Change
What fossil fuels really cost us in a world at war
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


The post What fossil fuels really cost us in a world at war appeared first on Climate Home News.
Climate Change
Traditional models still ‘outperform AI’ for extreme weather forecasts
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.

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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