新数据显示,继过去几年的低迷之后,2023年中国对非洲可再生能源项目的投资出现反弹。
中国和非洲之间的气候合作是中非合作论坛的一个重点议题。论坛每三年举行一次。本次峰会于9月6日闭幕,有数十位领导人齐聚北京。

上届中非合作论坛于2021年举行,论坛发表了一项具有里程碑意义的宣言,将气候合作“定位为”未来合作的“重要支柱”。同年,中国政府宣布停止为煤电项目提供资金。
随之而来的是对能源项目的政策性银行贷款出现暂停,这引发了人们对中国在非洲能源贷款前景的担忧。然而,波士顿大学全球发展政策中心(Boston University Global Development Policy Center)的最新数据显示,随着银行调整战略,以遵循投资低碳能源和“小而美”项目的要求,这种暂停只是一种重置。
本文分析了这一转变,并探讨了中国为非洲未来可再生能源建设提供融资所面临的挑战。
“既有”利益
中国一直是非洲的能源项目,尤其是化石燃料项目的重要融资方。非洲约75%的电力来自化石燃料,尽管其能源相关的碳排放量占全球总排放量的不到3%,电气化率也是所有有人居住的大洲中最低的。
过去,中国的大部分融资都是由中国两家政策性银行——中国进出口银行和国家开发银行——支持推动的,而且主要针对燃煤电厂。
这两家银行在非洲各地发放了1820亿美元的贷款,主要投向了能源行业。波士顿大学全球发展政策中心的数据显示,从2000年到2023年,政策性银行贷款总额的15%流向了化石燃料行业,12%流向了水电站。
相比之下,发放给太阳能、风能或地热项目的贷款按价值计算不到1%。
这在很大程度上是由于中国官方出资者与国企之间既有联系。根据中南项目(China Global South Project)的数据,从历史上看,大多数中国国企都专注于煤炭和水电等传统电力领域。
英国开放大学(Open University)国际发展教育讲师弗兰顿·奇耶穆拉(Frangton Chiyemura)博士告诉Carbon Brief,中国在2000和2010年代的国际发展活动反映了当时中国自身的“内部发展轨迹”,因为中国也发展了以煤炭为主导的电力系统,而水电是最大的低碳能源。
他表示,在这个“走出去”的时期,非洲的大多数能源项目开发商——主要是中国国企——都专长于水电和煤炭,这导致更多此类项目获得融资并得以建设。
他补充说,这些国企“在保险、融资和与非洲各国政府接触方面都有国家支持……(而且)没有做太多试图建立市场的基础工作”。
“小而美”
2023年,中国进出口银行和国家开发银行承诺向三个能源项目注资5.02亿美元,包括布基纳法索的一个太阳能发电厂和马达加斯加的一个水电站,结束了2021年和2022年能源贷款的“中断”,如下图所示。

中国政策性银行在非洲的能源贷款暂停了两年,部分原因可能是新冠大流行期间的经济压力。
不过,波士顿大学全球发展政策中心认为,在中国国家主席于2021年承诺停止资助煤电,转而建设“小而美”的项目后,这些银行似乎也暂停了活动,以对其投资战略作出“必要的调整”。
2021年中非合作论坛气候变化宣言也确认,中国将进一步增加对非洲可再生能源和其他低碳项目的投资,“不会在国外建立新的燃煤发电项目”。
奇耶穆拉告诉Carbon Brief,这两年间的贷款减少并非中国政策性银行的“独有”现象。他补充称,在疫情期间,西方国家向非洲提供的贷款也有所下降。
他还同意,中国贷款机构将重点从“数量”转向“质量”,更多地考虑与新项目相关的投资风险和社会影响,这加速了投资的转变。
在此期间,中国的其他利益相关者——从中国电建集团和三峡集团等国企到晶澳科技等私企——都同意为可再生能源项目提供资金或参与项目建设。
根据睿纳新国际咨询公司(Development Reimagined)整理的独立数据(如下图所示),自2021年中非论坛以来,已有138个新的气候相关项目达成协议,而且在过去18个月里,这一数字还在加速增长。

数据库中记录的项目包括超过20吉瓦(GW)的太阳能项目、9吉瓦的水电项目以及1吉瓦的风电项目,如下图所示。

这些项目的资金来源广泛,包括中国和非中国企业、非洲和其他非中国金融机构,以及多边开发银行。
该咨询公司的项目经理兼中国气候融资政策负责人付亦可(Fu Yike;音译)对Carbon Brief说,在中国国家主席习近平2021年作出承诺后,中国国企已表示有兴趣“探索在非洲开展项目的新方式”,包括参与太阳能项目。
在数据库中列出的55个太阳能和风能项目中,国有企业分别参与了46个和5个。
根据睿纳新的分析,到2030年,中国在非洲的清洁能源项目装机可达224吉瓦,这意味着中国参与非洲的能源转型对于非洲实现2030年300吉瓦的目标至关重要。
付亦可补充说,特别是太阳能发电装机预计将成为中国未来在非洲能源部署的一大特色。
陡峭的“学习曲线”
总部设在伦敦的智库海外发展研究所(ODI)认为,中国“一带一路”倡议所建立的机制可以协助在非洲部署平价低碳技术,如同其促进了铁路和港口等中国国内基建产能向非洲“溢出”一样。
然而,奇耶穆拉告诉Carbon Brief,许多习惯于开发煤炭和水电的国企在转向可再生能源方面面临着巨大挑战。
此前,这些国企通过由政策性银行贷款资助的EPC总承包合同(即设计、采购和建造合同)来开发能源基础设施,这种合同只要求它们建设基础设施,而不负责运营和维护。
现在,非洲的决策者越来越多地推动采用股权融资模式,鼓励中国企业投资可再生能源项目并持有股份。
然而,奇耶穆拉表示,这种模式涉及到国企不太习惯的业务流程。
例如,埃塞俄比亚正在通过股权融资开发一座风力发电厂,从而减轻该国的债务压力。奇耶穆拉说,这意味着中国企业将不得不参与公开招标系统,而不是他们所习惯的闭门谈判。
“我记得一位(公司代表)说:‘为什么我要为一个(价值)可能只有8000万至9000万美元的项目浪费金钱和时间呢?’……企业认为,把时间花在(编写)招标文件上没有任何价值……但这表明它们在理解监管要求方面缺乏经验,而非洲的市场监管正在迅速变化。”
此外,付亦可认为,一些公司还对非洲的投资风险表示担忧。
大多数非洲国家在世界银行的“营商便利度”排名中靠后,这意味着监管环境不利于在当地创办和运营公司。
付亦可补充说,中国民营企业更愿意与国企合作,这可以将它们的参与与中国政府的利益更紧密地联系起来,从而限制它们的风险敞口。
奇耶穆拉与他人共同撰写的一篇论文也提到了这一点:“最近的趋势是在这些私营企业和国有企业之间建立一个联合体……很明显,在现有的政策群体中,新的联盟或利益集团正在形成,它们更加致力于促进风能和太阳能活动。”
奇耶穆拉称,部分原因是非洲在能源法规方面“快速变化”的环境。
非洲经济研究联合会(African Economic Research Consortium)合作研究经理戴安娜·恩吉·穆查伊(Dianah Ngui Muchai)认为,促进非洲投资的关键是针对可再生能源项目的“灵活和创新的(金融)工具”,以及“明确和现实”的政策目标。
奇耶穆拉告诉Carbon Brief,南非和埃塞俄比亚一直在尝试通过开发股权融资风电项目来实现这一目标。
“这是一条学习曲线,但我们相信也许在未来五到十年内……我们很可能会看到一些中国公司通过股权融资来开发这些项目。”他说。
中非论坛强调转向投资
这些主题在今年中非论坛的成果中得到了呼应。在主旨演讲中,习主席承诺向非洲提供价值3600亿元人民币(510亿美元)的资金支持。其中,2100亿元人民币(300亿美元)将通过信贷资金额度支付,700亿元人民币(100亿美元)将通过投资支付。
其中部分资金将用于资助一系列“清洁能源”项目,而“绿色发展”在会后的官方宣传中占据了重要位置。习主席在主旨演讲中指出,中方愿在非洲实施30个具体的清洁能源项目。
会后发表的宣言指出:“中方支持非洲国家更好利用光伏、水电、风能等可再生能源,进一步扩大在节能技术、高新技术产业、绿色低碳产业等低排放项目的对非投资规模。”
此外,与宣言同时发布的还有一份涵盖2025至2027年中非合作的行动计划,其中列出了指导未来三年中非合作的十大“伙伴行动”,包括“贸易繁荣”、“产业链合作”和“绿色发展”。

双方还将进行更广泛的能源合作,中方“将鼓励对非洲包括太阳能、风能、绿氢、水力发电、地热等可再生能源项目投资”。
习主席还告诉中非论坛代表,中国将“鼓励中非企业‘双向奔赴’投资创业……把产业附加值留在非洲,为非洲创造不少于100万个就业岗位。”
南非总统西里尔·拉马福萨(Cyril Ramaphosa)在新闻发布会上说,他“对习主席今天宣布的资金数额持非常积极的态度”,并补充说“这将是非洲大陆的一大福音”。
中南项目的分析则不那么乐观,认为报道标题上的数字“极具误导性”。
分析称,300亿美元的信贷额度“很可能………将更多地惠及中国企业,而非非洲利益相关者”,而100亿美元的投资数字“不应被视为政府财政承诺的一部分……因为(这笔资金)将由中国民营企业,尤其是采矿业企业提供”。
中南项目联合创始人埃里克·奥兰德(Eric Olander)告诉彭博社,这笔信贷可能会被用于“资助从中国购买大量太阳能电池板、电池和电动汽车”,以供非洲使用。
但非中政策咨询中心(Africa-China Centre for Policy and Advisory)高级研究员艾萨克·安克拉(Isaac Ankrah)博士告诉Carbon Brief,习主席对在整个非洲发展“绿色增长引擎”的关注凸显了中国“转向更具结构化的气候适应项目融资模式,重点关注技术转让、产能建设和可持续基础设施”。
他补充说,“这些承诺可能导致资金流的重新调整,使其更加符合非洲能源转型的具体需求”。
中非论坛对投资的关注是否会导致其切实远离贷款驱动型项目还有待观察,但一些非洲决策者将推动这种转变发生视为首要任务。
正如安哥拉财长维拉·戴维斯·德索萨(Vera Daves De Sousa)在接受路透社采访时所说:“我们需要打破常规思维: “我们需要跳出思维定式,因为‘你给我钱,我给你抵押品’的简单解决方案已经过时了。”
The post 深度报道:中国对非洲可再生能源的投资在沉寂两年之后反弹 appeared first on Carbon Brief.
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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