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
Flooded food baskets
AG EMERGENCY: Flash flooding has destroyed thousands of acres of crops in Punjab, a province that accounts for 68% of Pakistan’s total annual food grain production, Bloomberg reported. Around 60% of the province’s rice crops and 30% of its sugarcane have been lost, according to preliminary estimates by the Pakistan Business Forum. Pakistan’s Dawn newspaper reported that the forum has written to the prime minister to ask the government to declare an “agricultural emergency”. The New York Times spoke to farmers affected by the flooding.
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CROSS-BORDER IMPACTS: In Indian Punjab, at least 148,000 hectares of cropland have been “submerged” by floodwaters, BBC News reported. It continued: “Punjab is often referred to as the ‘food basket’ of India and is a major source for agricultural production, particularly of staples like wheat and rice.” It added that a “quarter of Punjab’s 30 million people depend on agriculture” for their livelihoods. The Guardian spoke to Indian farmers left reeling from the impacts of flooding on their crops. Reuters reported that flooding has driven up the prices of aromatic basmati rice, grown exclusively in India and Pakistan.
CLIMATE ‘VULNERABLE’: In its coverage, Al Jazeera reported that there has not yet been a formal assessment of the role of climate change in the ongoing floods, but it is likely to be a key factor in their severity. It added that Pakistan “ranks among the top 10 most climate-vulnerable nations, but it contributes less than 1% of global emissions”. The Washington Post covered how deforestation has conspired with accelerating glacier melt and harsher monsoon rains to drive worse flash floods in the country.
‘Tropical forests forever’
FLAGSHIP FUND: Brazil is planning to make its Tropical Forest Forever Facility one of two priority initiatives at the COP30 climate summit in the Amazon city of Belém in November, according to a Financial Times report from São Paulo and Brasília. First proposed at COP28 in 2023, the facility aims to leverage finance from developed nations and philanthropic foundations to make protecting tropical forests in developing nations profitable, the Financial Times explained in a second report.
RAISING BILLIONS: A “crucial” aspect of the plan is to “not rely on donations”, the newspaper said, adding: “Instead it would be financed entirely by interest-bearing debt.” It noted that the fund “would become the world’s biggest ‘blended finance’ vehicle if it can get anywhere close to its target size [of $125bn]”. There are 74 developing countries with a total of more than 1bn hectares of tropical forests that could be eligible for the scheme if they can prove that they have an annual deforestation rate of less than 0.5%, the newspaper added.
SUBSIDY REFORM: Meanwhile, Astrid Schomaker, the executive secretary of the UN biodiversity convention, has written to countries urging them to identify subsidies that are harmful to nature in their long-overdue national biodiversity plans and “take concrete implementation action” to reform them. Reducing the amount spent on subsidies harmful to nature by $500bn by 2030 was one of the targets of the landmark Kunming-Montreal Global Biodiversity Framework (GBF). However, countries have so far done little to identify such spending or conceptualise paths for reform at talks following the agreement of the GBF, Carbon Brief reporting has shown.
News and views
TREATY AHOY?: Two more countries – Cape Verde and Saint Kitts and Nevis – ratified the landmark High Seas Treaty during preparatory meetings last week, Earth Negotiations Bulletin reported. Grenada and Cambodia also ratified the agreement, meaning only four more countries need to officially sign before the treaty can enter into force. Separately, the Philippines “br[oke new] ground” by establishing the 370-acre Bitaug marine protected area, creating a “safe space” for sharks and rays and allowing revenue-sharing from eco-tourism, Forbes reported.
ACT-ING UP: ACT, part of New Zealand’s ruling coalition, called for the country to leave the “broken” Paris Agreement, citing the “real cost to firms, farms and families” from net-zero targets, Radio New Zealand reported. The country’s prime minister, Christopher Luxon, pushed back against pulling out from the accord, it added, telling reporters that it would be the “quickest way” to hurt New Zealand farmers and that “competitor countries would like nothing more than to see New Zealand products off their shelves”.
FIRE-PROOFING: In the aftermath of August’s “heatwave-fuelled” wildfires, Spain’s prime minister, Pedro Sánchez, announced a 10-point plan to prepare the country for climate change, including a “rethink of forest management and land use”, the Guardian reported. Sanchez was quoted as saying: “If we don’t want to bequeath our children a Spain that’s grey from fire and flames, or a Spain that’s brown from floods, then we need a Spain that’s greener.” CBS News reported that two climate activists were arrested for throwing paint at Barcelona’s Sagrada Familia while protesting government “complicity” in the fires, which they attributed to livestock farming.
OCTOPUS ‘PLAGUE’: An unusual explosion in octopus numbers in English waters this summer has left UK shellfish harvesters at a loss, Agence France-Presse reported. A long-lasting marine heatwave gave a boost to octopus populations earlier in the year, delighting some fishers that were able to profit from the boom, but harming others that make a living from shellfish, the newswire said. “The tentacled molluscs are notoriously voracious eaters, hoovering up crustaceans such as crabs and shellfish,” the article explained, adding that many UK crab potters found their traps empty when octopus numbers increased.
JAGUARS RETURN: Jaguar numbers in Mexico have risen by 30% over the past 15 years following a “conservation drive”, the Guardian reported. Based on a census carried out with 920 motion-capture cameras across 414,000 hectares, researchers estimated that there are now 5,326 jaguars in Mexico, the newspaper said. A local expert listed three main reasons for the uptick: “Maintaining natural protected areas where jaguars can roam freely, reducing the conflict between cattle ranchers and jaguars and a publicity campaign that has put the jaguar on the map.”
LEGAL EFFORTS: Four residents of the Indonesian island of Pari are seeking damages from the world’s largest cement producer, the Swiss company Holcim, due to the impact of climate change on their lives, Reuters reported. A hearing was held in the Swiss city of Zug on 3 September, but ended with no decision, according to the European Center for Constitutional and Human Rights. Elsewhere, Climate Home News reported on how farmers in Zambia are threatening to sue a Chinese copper company following a “massive toxic spill”.
Spotlight
Grains of truth
This week, Cropped talks to the authors of a new graphic novel about food sovereignty and resilient rice cultures in India’s eastern Indigenous heartlands.
The eastern Indian state of Jharkhand is better known for its rich coal reserves than for its grain.
Unlike India’s breadbasket in the north-west, less than 10% of Jharkhand’s cultivated land is irrigated, making its rainfed paddy highly reliant on a changing Indian monsoon.
In 2022, the state received its lowest rainfall in 121 years.
‘Plastic’ rice
The previous year, many of Jharkhand’s Indigenous villages were among the first to taste the outcome of a new Indian government strategy to combat malnutrition and anaemia: fortified rice.
Essentially, “fortification” involves mixing broken rice kernels and rice powder with nutrients, such as iron and vitamin B12. After being passed through an extrusion machine, these new “grains” are then mixed with regular rice that is distributed to India’s poor under India’s National Food Security Act, the world’s largest and most far-reaching food safety scheme.
According to a three-part investigation by journalist Anumeha Yadav in the Wire, Jharkhand’s Indigenous rice-growing communities were not convinced of the new grain’s benefits, dubbing it “plastic rice” and questioning its effects on their health.
The Indian government attributed farmers’ reactions to a “lack of awareness” and has since expanded the programme.
Yadav’s reportage led to the publication of a new graphic novel, Our Rice Tastes of Spring, illustrated by Bangalore-based studio Spitting Image.
Yadav told Carbon Brief she wrote the novel to document diverse food cultures and as a response to “tech fixes” being promoted to address climate change and achieve the UN Sustainable Development Goals.
According to Yadav, there’s widespread consensus that farming methods ushered in by the Green Revolution have made diets cereal-heavy and depleted India’s soils, meaning the “food we’re eating is much, much worse than what even our parents ate”.
At the same time, the industrial agricultural industry – and even some NGOs – are pushing a “tech fix” aimed at India’s poor that “makes money for themselves”, she added.

Drawn from real life
Lead illustrator Sandhya Visvanathan told Carbon Brief she combined Yadav’s photographs – of “life and people as they are” on Jharkhand’s Netarhat plateau – with “painterly” drawings of daily life in a community “whose lives are intertwined with the land”.
While the plot is set in a fictional Indigenous village, the conversations, rituals and rice varieties the book depicts are very real.
For instance, Ranikajal rice grows longer stems as floodwaters rise and iron-rich red Agni-sal grain has stems known to resist even cyclones.
Anumeha warns that many of these varieties – and the creative, traditional knowledge systems associated with them – are at risk of being lost forever, as India promotes and procures input-intensive white rice.
She concluded:
“Many people looked at the images and said: ‘Hey, that seed used to grow here.’ But there’s also a question of dignity and agency here: even farmers know there is corporate interest involved in these saviour[-like] solutions. Someone actually said that to me: ‘The market is not the only principle in our life.’”
Watch, read, listen
SECTS, SOYA AND CATTLE: A new documentary by the Gecko Project investigated the key drivers behind the worst fires on record in Bolivia’s Chiquitano forest.
DURIAN DURIAN: The New York Times profiled “self-described fanatics” of the “odoriferous” durian fruit, who gathered in Puerto Rico to sample durian in a “judgment-free zone”.
SAVING THE ‘FATTEST PARROT’: The Guardian reported on efforts to protect New Zealand’s kakapos, the “world’s fattest parrot”, by vaccinating them against bird flu.
BEGIN AGAIN: A Financial Times column explored how “why veganism lost” out to “influencers and gym bros” pushing protein and how it could regain momentum in the public.
New science
- Human impacts on global marine ecosystems are expected to more than double by the mid-century | Science
- Deforestation accounted for about three-quarters of the reduction in rainfall and surface temperature increase recorded during the dry season in the Brazilian Amazon over the past 35 years | Nature Communications
- Nearly 40% of the world’s transboundary river basins could see conflicts arising from water scarcity in 2041-50, although these conflicts could be mitigated by “proactive measures” | Nature Communications
In the diary
- 18 September: Earthed Summit 2025: Generation Restoration | London
- 19 September: Call for evidence on EU fertiliser product regulation | Online
- 21-28 September: New York Climate Week | New York City
- 24 September: UN General Assembly high-level week climate summit | New York City
- 29 September-1 October: FAO global conference on sustainable livestock transformation | Rome
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 10 September 2025: Flooded ‘food baskets’; Brazil eyes forest finance; Resilient rice appeared first on Carbon Brief.
Cropped 10 September 2025: Flooded ‘food baskets’; Brazil eyes forest finance; Resilient rice
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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