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China’s thinking around the energy transition shifted drastically in 2020 after president Xi Jinping pledged to reach carbon neutrality before 2060.

Despite a series of major policy developments since then, however, it is still not clear what the new energy system will look like and which pathways are the most efficient for China to reach its carbon neutrality goal.

Our latest research models three scenarios for China’s energy transition: one in which China develops a net-zero emissions energy system before 2055; one in which it achieves this around 2055; and a baseline scenario that extrapolates current development trends. 

We find that a combination of energy efficiency measures, electrification of end-use consumption and a low-carbon power supply based on various renewable energy sources – such as solar and wind – can greatly help the country to achieve its decarbonisation goals by 2055.  

In the most ambitious scenario, China’s power sector will be fossil fuel-free by 2055, while some industries will continue to use a small amount of coal and gas. However, this will be balanced by negative emissions from biomass power plants fitted with carbon capture and storage (BECCS). 

How the dual carbon targets changed the game

When Xi began his speech at the UN General Assembly in September 2020, few had expected him to deliver such a ground-breaking announcement.

In his words: “We aim to have CO2 [carbon dioxide] emissions peak before 2030 and achieve carbon neutrality before 2060.”

This policy is now more commonly known as the “dual carbon” goals.

That one sentence changed the whole understanding of the energy transformation in China. 

Until then, China’s target was to “promote a revolution in energy production and consumption, and build an energy sector that is clean, low-carbon, safe and efficient”, as Xi had said at the 19th National Congress of the Communist Party in China (CPC) in October 2017.

Xi’s 2020 speech shifted China’s priorities from reaching “low-carbon” to reaching “carbon neutrality”, from an energy sector that includes at least some fossil fuel consumption, to an energy sector which leaves little room for coal, oil and gas once carbon neutrality is reached.

The difference required a genuine change of mindset throughout China’s political system and stakeholders within the energy system, such as major power producers.

China started this immediately after the announcement: the State Council, China’s top administrative body, introduced the 1+N policy strategy, which is comprised of an overarching guideline for reaching the “dual carbon” goals (the “1”) and a number of more concrete guidelines and regulations to implement the strategy (the “N”). 

So far, the policies have mainly focused on reaching the carbon peak before 2030 – but the long-term goal of carbon neutrality by 2060 is ever-present.

The National Energy Administration (NEA) has launched a blueprint for a new type of power system. At a broader level, several government departments have outlined efforts to transform the entire energy system, as opposed to just the power system, in the effort to reach carbon neutrality. 

Hence, the foundation for China’s energy transformation is much more solid and precise today than it was before Xi’s announcement. The question now is: what will the new type of energy system look like and how will China reach it?

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Three scenarios for China’s energy transformation

To answer these questions, our programme modelled three scenarios for China’s energy transformation: one in which China develops a net-zero emissions energy system before 2055; one in which it achieves this around 2055; and a baseline scenario that extrapolates current development trends. 

The analysis is based on a detailed bottom-up modelling approach, while, at the same time, using visions for a “Beautiful China” – an official initiative for “the nation’s green and high-quality growth” – as guidelines for the transformation. 

In our modelling, the overarching strategy for the energy transformation consists of three intertwined actions:

  • Increase energy efficiency throughout the supply chain. 
  • Electrify the end-use sectors as much as possible.
  • Transform the power sector into a “green”, fossil-free sector with solar and wind power as the backbone of the system.

    (The Intergovernmental Panel on Climate Change’s latest assessment report showed that these are key elements of all global pathways that limit warming to 1.5C or 2C.)

    A consequence of following this strategy would be that the Chinese energy system would be able to provide energy for sustainable economic growth in China with net-zero carbon emissions, improved air quality and a high level of energy security.

    In the most ambitious scenario, the Chinese power system would be carbon-neutral from 2045 – and the whole energy system before 2055.

    Compared to today, total primary energy consumption would be lower in 2060 despite economic growth. Moreover, coal, oil and gas would be practically phased out of the system – and dependence on imported fossil fuels would be eliminated.

    The figure below shows the energy flowing through China’s economy in 2021 (upper panel) compared with the energy flow in 2060 under this most ambitious scenario (lower panel).

    On the left, each panel shows sources of primary energy flowing into the economy such as coal (black), gas (pink), oil (shades of grey) and non-fossil fuels such as nuclear (brown), hydro (dark blue), wind (light blue) and solar (yellow).

    The centre of each panel illustrates the transformation of primary energy into more useful forms, such as electricity or refined oil products. Much of the primary energy contained in fossil fuels is wasted at this stage (“losses”) in the form of waste heat.

    On the right, the users of final energy are broken down by sector.

    Most notably, fossil fuels – particularly coal – are the largest sources of energy in 2021, whereas in the ambitious 2060 scenario, below, low-carbon sources dominate.

    China Energy Flow Chart
    China Energy Flow Chart
    Left: Sources of primary energy in China. Centre: Transformation of primary energy into more useful forms. Right: Users of final energy by sector. Top panel: Energy flows in 2021. Bottom: 2060. Credit: ERI (2023).

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    Three phases in China’s energy transformation

    Our study suggests the transformation pathway will have three main phases. The first phase is the peaking phase until 2030.

    During this period, the deployment of wind and solar power would continue to increase, while electrification of the industry and transport sectors would gain momentum.

    However, coal and oil would remain the dominant energy sources in terms of total primary energy consumption.

    Next is the “energy revolution” phase, from 2030 to 2050. During this phase, solar and wind power would become the main energy sources for electricity supply, and the electrification of the end-use sectors would be substantial.

    The shift away from fossil fuels minimises the loss of waste heat in electricity generation and refining. Meanwhile, “green hydrogen” made from renewable power would become increasingly important in the industrial sectors.

    The third phase is the consolidation phase, from 2050 to 2060. Decarbonisation occurs in sub-sectors that are challenging to electrify, such as the steel and chemicals industries, the old solar and wind power plants are replaced by new solar and wind power, and remaining fossil fuels in the energy mix are nearly phased out.

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    Coal power plants become flexibility providers

    Although the Chinese government plans to “phase down” coal from 2025, based on the current policy guidelines and market situation, we estimate that coal power capacity would not be rapidly removed in any of our three scenarios. 

    Instead, coal power plants would gradually become providers of energy security and capacity to meet peaks in electricity demand, and not generate large amounts of electricity.

    By the time they reach the end of their expected lifetime of around 30 years, the plants would be shut down and not replaced with new coal capacity. In our most ambitious scenario, the last coal power plants are closed in 2055, as shown in the figure below. 

    The upper panel in the figure shows the installed capacity of coal power plants and the lower panel their electricity production from 2021 to 2060.

    Installed coal capacity will peak in the late 2020s and steadily decline
    Coal power generation will peak in 2030, and fall to 26TWh by 2055
    Top: coal power capacity 2021-2060, gigawatts. Bottom: coal power generation 2021-2060, terawatt hours. Credit: ERI (2023)

    Meanwhile, gas does not play a significant role in the power sector in our scenarios, as solar and wind can provide cheaper electricity while existing coal power plants – together with scaled-up expansion of energy storage and demand-side response facilities – can provide sufficient flexibility and peak-load capacity.

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    Managing a grid dominated by variable wind and solar

    An energy system that relies on solar and wind power as main suppliers of power requires special flexibility measures to match production and demand. 

    The figure below shows a modelled example of an hourly electricity balance in a week in the summer of 2060 under our more ambitious scenario of achieving carbon neutrality before 2055.

    The top panel shows electricity production on the supply side. In the daytime solar power (yellow) dominates the production of electricity, while wind power plants (light blue) have a more stable output throughout the 24-hour period.

    In the evening and at night, electricity storage is discharged (purple) and hydropower production (dark blue) is higher than in the daytime.

    The lower panel shows electricity use on the demand side. Storage (purple) is charged in the daytime and electric vehicle (EV) smart charging (blue) provides flexibility throughout the week.

    A safe, efficient, and green electricity system dominated by wind and solar power
    Top: Electricity supply on a hypothetical summer week in 2060. Bottom: Electricity demand. Credit: ERI (2023)

    As a backup, vehicle-to-grid supply plays an important role – not necessarily as a significant energy provider but as a last-resort capacity that can be activated if necessary, when wind and solar output is low. This solution is a cheap and efficient way to ensure sufficient capacity in the power system.

    Before 2055, coal power plants could be equally reliable and affordable providers of capacity for the power system, even though they would not generate much electricity on average, as mentioned earlier.

    This way of creating flexibility might seem complicated to manage in terms of daily dispatch (the process of managing supply and demand). However, an efficient and well-functioning electricity market, including consumers and producers, can do the job.

    Removing the barriers to electricity trading among provinces and constructing a unified national electricity market would be a key enabler of this.

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    Visions for the future

    The scenarios from our China Energy Transformation Outlook give a range of quantified visions of the long-term future in a net-zero energy system.

    Our detailed model of the power system and other energy end-use sectors make it possible to link the development of this new energy system with policy measures that could bring about this transformation.

    One key insight from our work relates to the timing of the different phases of China’s energy transformation, mentioned above. Our modelling suggests that successful coordination of these phases will be crucial, in order to maintain energy security while avoiding unnecessary investments in energy infrastructure.

    Other key enablers in our scenarios are the investments needed to expand the electricity grid, the development of a national electricity market and support for energy system flexibility.

    Even with the best visions, and insights from pathways such as ours, there will be many challenges and barriers ahead to overcome if China is to reach its 2060 goal.

    Our scenarios show, however, that there are feasible and cost-efficient pathways which can be implemented without waiting for new technological breakthroughs.

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    The post Guest post: How China’s energy system can reach carbon neutrality before 2055 appeared first on Carbon Brief.

    Guest post: How China’s energy system can reach carbon neutrality before 2055

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

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

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

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

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

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

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

    1. Stop fuelling the fire

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

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

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

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

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

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

    2. Make big polluters pay

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

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

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

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

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

    3. Support everyone to be part of the solution

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

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

    4. Build the industries of the future

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

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

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

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

    5. Build community resilience

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

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

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

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

    6. Be a better neighbour

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

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

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

    7. Protect nature

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

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

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

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

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

    Conclusion

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

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

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    What fossil fuels really cost us in a world at war

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    Anne Jellema is Executive Director of 350.org.

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

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

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

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

    Drain on households and economies

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

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

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

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

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

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

      Massive transfer of wealth to fossil fuel industry

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

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

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

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

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

      How to transition from dirty to clean energy

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

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

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

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

      It’s time for the great power shift

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

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

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

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

      The post What fossil fuels really cost us in a world at war appeared first on Climate Home News.

      What fossil fuels really cost us in a world at war

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      Traditional models still ‘outperform AI’ for extreme weather forecasts

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

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

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

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

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

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

      AI weather forecasts

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

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

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

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

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

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

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

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

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

      However, these models also have drawbacks.

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

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

      Record-breaking extremes

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

      They find similar results for cold and wind records.

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

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

      ‘Warning shot’

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

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

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

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

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

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

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

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

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

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

      Advances in forecasting

      The field of AI weather forecasting is evolving rapidly.

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

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

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

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

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

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

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

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

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

      Traditional models still ‘outperform AI’ for extreme weather forecasts

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