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At 12.33pm on Monday 28 April, most of Spain and Portugal were plunged into chaos by a blackout.

While the initial trigger remains uncertain, the nationwide blackouts took place after around 15 gigawatts (GW) of electricity generating capacity – equivalent to 60% of Spain’s power demand at the time – dropped off the system within the space of five seconds.

The blackouts left millions of people without power, with trains, traffic lights, ATMs, phone connections and internet access failing across the Iberian peninsula.

By Tuesday morning, almost all electricity supplies across Spain and Portugal had been restored, but questions about the root cause remained.

Many media outlets were quick to – despite very little available data or information – blame renewables, net-zero or the energy transition for the blackout, even if only by association, by highlighting the key role solar power plays in the region’s electricity mix.

Below, Carbon Brief examines what is known about the Spanish and Portuguese power cuts, the role of renewables and how the media has responded.

What happened and what was the impact?

The near-total power outage in the Iberian Peninsula on Monday affected millions of people.

Spain and Portugal experienced the most extensive blackouts, but Andorra also reported outages, as did the Basque region of France. According to Reuters, the blackout was the biggest in Europe’s history.

In a conference call with reporters, Spanish grid operator Red Eléctrica set out the order of events.

Shortly after 12.30pm, the grid suffered an “event” akin to loss of power generation, according to a summary of the call posted by Bloomberg’s energy and commodities columnist Javier Blas on LinkedIn. While the grid almost immediately self-stabilised and recovered, about 1.5 seconds later a second “event” hit, he wrote.

Around 3.5 seconds later, the interconnector between the Spanish region of Catalonia and south-west France was disconnected due to grid instability. Immediately after this, there was a “massive” loss of power on the system, Blas said.

This caused the power grid to “cascade down into collapse”, causing the “unexplained disappearance” of 60% of Spain’s generation, according to Politico.

It quoted Spanish prime minister Pedro Sánchez, who told a press conference late on Monday that the causes were not yet known:

“This has never happened before. And what caused it is something that the experts have not yet established – but they will.”

The figure below shows the sudden loss of 15GW of generating capacity from the Spanish grid at 12.33pm on Monday. In addition, a further 5GW disconnected from the Portuguese grid.

 Electricity generation capacity in Spain, megawatts (MW), from 27-29 April, showing the drop in generation.
Electricity generation capacity in Spain, megawatts (MW), from 27-29 April, showing the drop in generation. Credit: Red Eléctrica.

The Guardian noted in its coverage that “while the system weathered the first event, it could not cope with the second”.

A separate piece from the publication added that “barely a corner of the peninsula, which has a joint population of almost 60 million people, escaped the blackout”.

El País reported that “the power cut…paralysed the normal functioning of infrastructures, telecommunications, roads, train stations, airports, stores and buildings. Hospitals have not been impacted as they are using generators.”

According to Spanish newswire EFE, “hundreds of thousands of people flooded the streets, forced to walk long distances home due to paralysed metro and commuter train services, without mobile apps as telecommunications networks also faltered”.

It added that between 30,000 and 35,000 passengers had to be evacuated from stranded trains.

el_pais_madrid on X: Madrid recupera el servicio de Metro

The New York Times reported that Portuguese banks and schools closed, while ATMs stopped working across the country and Spain. People “crammed into stores to buy food and other essentials as clerks used pen and paper to record cash-only transactions”, it added.

Spain’s interior ministry declared a national emergency, according to Reuters, deploying 30,000 police to keep order.

Both Spain and Portugal convened emergency cabinet meetings, with Spain’s King Felipe VI chairing a national security council meeting on Tuesday to discuss an investigation into the power outage, Sky News reported.

By 10pm on Monday, 421 out of Spain’s 680 substations were back online, meaning that 43% of expected power demand was being met, reported the Guardian.

By Tuesday morning, more than 99% of the total electricity supply had been recovered, according to Politico, quoting Red Eléctrica.

In Portugal, power had been restored to every substation on the country’s grid by 11.30pm on Monday. In a statement released on Tuesday, Portuguese grid operator REN said the grid had been “fully stabilised”.

What caused the power cuts?

In the wake of the power cuts, politicians, industry professionals, media outlets, armchair experts and the wider public scrambled to make sense of what had just happened.

Spanish prime minister Sánchez said on the afternoon of the blackout that the government did not have “conclusive information” on its cause, adding that it “[did] not rule out any hypothesis”, Spanish newspaper Diario Sur reported.

Nevertheless, some early theories were quickly rejected by officials.

Red Eléctrica, “preliminarily ruled out that the blackout was due to a cyberattack, human error or a meteorological or atmospheric phenomenon”, El País reported the day after the event.

Politico noted that “people in the street in Spain and some local politicians” had speculated about a cyberattack.

However, it quoted Eduardo Prieto, Red Eléctrica’s head of system operation services, saying that while the conclusions were preliminary, the operator had “been able to conclude that there has not been any type of intrusion in the electrical network control systems that could have caused the incident”.

The Majorca Daily Bulletin reported that Spain’s High Court said it would open an investigation into whether the event was the result of a cyberattack.

Initial reporting by news agencies blamed the power cuts on a “rare atmospheric phenomenon”, citing the Portuguese grid operator REN, according to the Guardian. The newspaper added that REN later said this statement had been incorrectly attributed to it.

The phenomenon in question was described as an “induced atmospheric vibration”.

Prof Mehdi Seyedmahmoudian, an electrical engineer at Swinburne University of Technology in Australia, explained in the Conversation that this was “not a commonly used term”.

Nevertheless, he said the phenomenon being described was familiar, referring to “wavelike movements” in the atmosphere caused by sudden changes in temperature or pressure.

In general terms, Reuters explained that power cuts are often linked to extreme weather, but that the “weather at the time of Monday’s collapse was fair”. It added that faults at power stations, power distribution lines or substations can also trigger outages.

Another theory was that a divergence of electrical frequency from 50 cycles per second (Hz), the European standard, could have caused parts of the system to shut down in order to protect equipment, France 24 explained.

Some analysts noted that “oscillations” in grid frequency shortly before the events in Spain and Portugal could be related to the power cuts. Tobias Burke, policy manager at Energy UK, explained this theory in his Substack:

“The fact these frequency oscillations mirrored those in Latvia…at the other extreme of the Europe-spanning ENTSO-E network, might suggest complex inter-area oscillations across markets could be the culprit.”

This phenomenon can be seen in a chart shared by Prof Lion Hirth, an energy researcher at Hertie School, on LinkedIn.

Lion Hirth on LinkedIn: What caused the blackout in Spain and Portugal yesterday

With many details still unknown, much of the media speculation has focused on the role that renewable energy could have played in the blackouts. (See: Did renewable energy play a role in the cut?)

Many of the experts cited in the media emphasised the complexity of determining the cause of the outages. Eamonn Lannoye, managing director at the Electric Power Research Institute Europe, was quoted by the Associated Press stating:

“There’s a variety of things that usually happen at the same time and it’s very difficult for any event to say ‘this was the root cause’.”

Nevertheless, there are several efforts now underway to determine what the causes were.

Portugal’s prime minister, Luís Montenegro, announced on Tuesday that the government would set up an independent technical commission to investigate the blackouts, while stressing that the problem had originated in Spain, according to Euractiv.

Finally, EU energy commissioner Dan Jørgensen has indicated that the EU will open a “thorough investigation” into the reasons behind the power cuts, BBC News noted.

Dan Jørgensen on X: The energy situation in Spain and Portugal is back to normal

Did renewable energy play a role in the blackouts?

As commentators began to look into the cause of the blackout, many pointed to the high share of renewables in Spain’s electricity mix.

On 16 April, Spain’s grid had run entirely on renewable sources for a full day for the first time ever, with wind accounting for 46% of total output, solar 27%, hydroelectric 23% and solar thermal and others meeting the rest, according to PV Magazine.

Spain is targeting 81% renewable power by 2030 and 100% by 2050.

At the time of the blackout on Monday, solar accounted for 59% of the country’s electricity supplies, wind nearly 12%, nuclear 11% and gas around 5%, reported the Independent.

The initial “event” is thought to have originated in the south-western region of Extremadura, noted Politico, “which is home to the country’s most powerful nuclear power plant, some of its largest hydroelectric dams and numerous solar farms.”

On Tuesday, Red Eléctrica’s head of system operation services Eduardo Prieta said that it was “very possible that the affected generation [in the initial ‘events’] could be solar”.

This sparked further speculation about how grids that are highly reliant on variable renewables can be managed so as to ensure security of supply.

Political groups such as the far-right VOX – which has historically pushed back against climate action such as the expansion of renewables – also pointed to the blackout as evidence of “the importance of a balanced energy mix”.

However, others rejected this suggestion, with EU energy chief Dan Jørgensen telling Bloomberg that the blackout could not be pinned on a “specific source of energy”:

“As far as we know, there was nothing unusual about the sources of energy supplying electricity to the system yesterday. So the causes of the blackout cannot be reduced to a specific source of energy, for instance renewables.”

Others have sought to highlight that, while it was possible solar power was involved in the initial frequency event, this does not mean that it was ultimately the cause of the blackout.

Writing on LinkedIn, chief technology officer of Arenko, a renewable energy software company, Roger Hollies, noted:

“The initial trip may well have been a solar plant, but trips happen all the time across all asset types. Networks should be designed to withstand multiple loss of generators. 15GW is not one power station, this is the equivalent of 10 large gas or nuclear power stations or 75 solar parks.”

Others pointed to what they said was insufficient nuclear power on the grid – a notion that prime minister Sánchez rejected, according to El País.

Speaking on Tuesday, he said that those arguing the blackouts showed a need for more nuclear power were “either lying or showing ignorance”, according to the newspaper. It said he highlighted that nuclear plants were yet to fully recover from the event.

One key aspect of the transition away from electricity systems built around thermal power stations burning coal, gas or uranium is a loss of “inertia”, the Financial Times highlighted.

Thermal power plants generate electricity using large spinning turbines, which rotate at the same 50 cycles per second (Hz) speed as the electrical grid oscillates. The weight of these “large lump[s] of spinning metal” gives them “inertia”, which counteracts changes in frequency on the rest of the grid.

When faults cause a rise or fall in grid frequency, this inertia helps lower the rate of change of frequency, giving system operators more time to respond, noted Adam Bell, director of policy at Stonehaven, in a post on LinkedIn.

Solar does not include a spinning generator, and therefore, critics pointed to the lack of inertia on the grid due to the high levels of the technology as a cause of the blackout.

As Bell pointed out, this ignores the inertia provided by nuclear, hydro and solar thermal on the grid at the time of the blackout, alongside the Spanish grid operator having built “synchronous condensers” to help boost inertia and grid stability.

Bell added:

“A lack of inertia was therefore not the main driver for the blackout. Indeed, post the frequency event, no fossil generation remained online – but wind, solar and hydro did.”

While the ultimate cause of the blackouts remains to be seen, they have highlighted the need for an increased focus on grid stability, particularly as the economy is electrified.

A selection of comments from experts published in Review Energy emphasises the need for further resilience to be built into the grid as it transitions away from fossil fuels.

How has the media responded to the power cut?

As the crisis was still unfolding and its cause remained unknown, several climate-sceptic right-leaning UK publications clamoured to draw a link between the blackouts and the nations’ reliance on renewable energy.

It comes as right-leaning titles have stepped up their campaigning against climate policy over the past year.

George Mann on Bluesky: The Daily Telegraph: Net zero blamed for blackout chaos

On Tuesday, the Daily Telegraph carried a frontpage story headlined: “Net-zero blamed for blackout chaos.”

But the article contradicted its own headline by concluding: “What exactly happened remains unclear for now. And the real answer is likely to involve several factors, not just one.”

None of the experts quoted in the piece blamed “net-zero” for the incident.

The Daily Telegraph also carried an editorial seeking to argue renewable energy was the cause of the blackouts, which claimed that “over-reliance on renewables means a less resilient grid”.

The Daily Express had an editorial (not online) claiming that the blackout shows “relying on renewables is dim”.

Additionally, the Standard carried a comment by notorious climate-sceptic commentator Ross Clark breathlessly blaming the blackout on “unreliable” renewables, with a fear-monguering warning that the “same could happen in the UK”.

The Daily Mail published a comment by Rupert Darwall, a climate-sceptic author who is part of the CO2 Coalition – an organisation seeking to promote “the important contribution made by carbon dioxide to our lives” – which claimed that the blackout showed “energy security is being sacrificed at the altar of green dogma”.

Climate-sceptic libertarian publication Spiked had a piece by its deputy editor Fraser Myers titled: “Spain’s blackouts are a disaster made by net-zero.” The article claimed that “our elites’ embrace of green ideology has divorced them from reality”.

In Spanish media, Jordi Sevilla, the former president of Red Eléctrica, wrote in the financial publication Cinco Días that, while it is not known what caused the blackout, it is clear that the country’s grid “requires investments to adapt to the technical reality of the new generation mix”. He continued:

“In Spain, in the last decade, there has been a revolution in electricity generation to the point that renewable technologies ([solar] photovoltaic and wind, above all) now occupy the majority of the energy mix. This has had very positive impacts on CO2 emissions, lower electricity prices and increased national autonomy.

“But there is a technical problem: photovoltaic and wind power are not synchronous energies, whereas our transmission and distribution networks are designed to operate only with a minimum voltage in the energy they transport. Therefore, to operate with current technology, the electrical system must maintain synchronous backup power, which can be hydroelectric, gas or nuclear, to be used when photovoltaic and wind power are insufficient, either due to their intermittent nature (there may be no sun or wind) or due to the lack of synchronisation required by the generators to operate.”

For Bloomberg, opinion columnist Javier Blas said that “Spain’s blackout shouldn’t trigger a retreat from renewables”, but shows that “an upgraded grid is urgently needed for the energy transition”. He added:

“​​The world didn’t walk away from fossil-fuel and nuclear power stations because New York suffered a massive blackout in 1977. And it shouldn’t walk away from solar and wind because Spain and Portugal lost power for a few hours.

“But we should learn that grid design, policy and risk mapping aren’t yet up to the task of handling too much power from renewable sources.”

The post Q&A: What we do – and do not – know about the blackout in Spain and Portugal appeared first on Carbon Brief.

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Big banks behind “net zero” alliance continued lending to coal firms

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Several major banks that helped set up the UN’s now-defunct Net-Zero Banking Alliance (NZBA) in 2021 have since continued to lend money to coal companies, a new report has revealed.

Bank of America, Barclays, Citibank, Deutsche Bank and Santander were heavily involved in the NZBA and the associated Glasgow Financial Alliance for Net Zero (GFANZ) when it was launched by Mark Carney, then a UN climate envoy and now Canada’s leader, in the run-up to the COP26 climate summit in Glasgow.

Despite their involvement, data released this week shows those banks and some others did not reduce the amount of money they lent, nor the value of their underwriting, to coal activities between 2022 and 2025. Around half of the NZBA members who were engaged in coal financing over that time increased it and half cut it, according to the report by German environmental research group Urgewald.

Ana Botín, executive chair of Santander, was a member of the GFANZ CEO principals’ group and said at the time of the NZBA launch that her Spanish bank was “proud to be part of the founding members of this new alliance and to accelerate progress towards net zero”.

Since then, the report’s data documents that Santander has provided loans and underwriting worth hundreds of millions of dollars each year to coal companies, particularly American coal-power plant operators Duke Energy and the Southern Company. Santander did not respond to a request for comment.

Urgewald’s research adjusts the value of loans and underwriting provided to coal companies based on how much of a company’s revenues come from the most polluting fossil fuel. So a hypothetical $100 million loan to German utility RWE is valued at $21 million, as 21% of RWE’s revenue is from coal.

The research does not take account of whether companies are expanding their coal business or phasing it out for greener alternatives. Some banks have said their coal clients need to put in place transition plans by a certain date. Some also say that, by a certain date, they will stop lending money to clients that get more than a set percentage of their revenue from coal.

    Most companies expanding coal are in Asian nations like China, India and Indonesia and are largely financed by banks from their own countries. But there are examples of NZBA founding members supporting companies that are actively prolonging the life of their coal businesses.

    For example, Glencore, a Switzerland-based multinational that gets 4% of its revenue from coal, has just won preliminary regulatory approval to keep on coal mining in Australia’s Hunter Valley until 2045. Last year, the company was supported by loans and underwriting from Bank of America, Citigroup, Santander, Barclays, Deutsche Bank, HSBC and Standard Chartered.

    Good and bad news

    Some NZBA founding members like Swiss giant UBS have reduced their loans and underwriting for coal companies, the data suggests. Others – like Triodos and Kenya Commercial Bank – have provided no support for coal companies since at least 2021.

    Urgewald researcher Hannah O’Neill told Climate Home News that “the banking sector is not moving in one direction. There is a growing divide between banks that are tightening their coal policies and reducing their exposure, and those where coal policies remain weak or where financing continues.”

    Unlike the UN’s Race to Zero campaign, with which it partnered, the NZBA did not require its members to end financing for fossil fuels like coal, leading to accusations by climate campaigners that its rules were too weak.

    Despite this, after Donald Trump’s re-election as US president in November 2024, several North American banks quit the alliance and the NZBA’s requirements were diluted in April 2025. After further withdrawals, the group shut itself down in October 2025.

    Globally, the Urgewald report found that many banks in the European Union, Thailand, Malaysia, India and Taiwan have reduced their coal finance since governments agreed at COP26 to phase down coal power.

    But with Chinese, American, Indonesian and South Korean banks increasing their support, total bank financing for the coal industry has remained broadly the same each year since 2022. 

    “Coal financing is not disappearing – but it is concentrating in banks and markets where coal policies are either missing or weak,” said Heffa Schücking, director of Urgewald.

    Urgewald’s definition of coal companies includes firms and their subsidiaries that explore for, process, trade, transport and mine coal, or burn it in power plants to produce electricity, or manufacture equipment for the coal industry. It does not include companies that use coal to make cement or steel – and an adjustment is made to account for how much of the business model is coal-related.

    Banks defend delays

    At the time of publication, most of the banks named in the report for increasing their coal finance had not responded to requests for comment. But a spokesperson for Deutsche Bank pointed Climate Home News to its May 2026 announcement that it was delaying its requirement for existing clients to present it with transition plans and cut their coal exposure.

    Instead of having to present these plans by the end of 2025, the bank has given them until the end of 2027. They will also have to ensure that their revenue share from thermal coal falls below half by then, the bank added. New clients need energy transition plans to access finance.

    Deutsche Bank said at the time it was delaying its requirements because of the “increasingly complex regulatory environment as well as differing speeds of energy transition in various regions beyond what was anticipated by Deutsche Bank in 2023”.

    Big banks’ lending to coal backers undermines Indonesia’s green plans 

    A spokesperson for Barclays told Climate Home News: “Many companies in this report are diversified energy or mining companies. We do not provide financing to companies that generate more than 30% of revenues from thermal coal mining or power generation, and we will phase out all financing by 2035.”

    The Barclays spokesperson added: “Barclays is financing an energy sector in transition, providing finance to meet current energy needs and also financing the scaling of clean energy. Over the past three years, we have facilitated more than $300 billion of sustainable and transition finance, including billions to cleaner energy projects, and invested millions into climate tech.”

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    As COP31 co-host, Australia should make its polluters pay for climate damage

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    Harjeet Singh is the global convenor of the Fill the Fund campaign and founding director of the Satat Sampada Climate Foundation. Julie-Anne Richards is strategic campaign lead for the Make Big Polluters Pay campaign in Australia.

    This year, a glacier collapse in Nepal’s Himalayan valleys swept away the lives of at least 1,500 people, with recovery costs of US$5 billion, or 10% of national GDP. But this was not a tragedy for which no one can be blamed. This was a crime with a balance sheet – one whose costs are paid by people who did nothing to cause it, and whose profits are booked by polluting corporations that did everything.

    Across the Pacific, the calculation of injustice is now brutally clear. According to Oxfam Australia, the average yearly GDP loss of Pacific countries from climate disasters has increased four-fold over the last decade, reaching 14.3% of GDP. The number of Pacific people battered by climate disasters has risen by 700% in a decade. Whole villages are being packed up and moved as the sea takes the land beneath them.

      Let’s look at the other ledger. This year, as climate change and an oil shock drove up the cost of living for ordinary families, Woodside – touted as “one of Australia’s biggest winners” from the war in the Middle East – reported revenues jumping nearly 30% to AUD$6 billion in just three months.

      In Australia, Oxfam finds that in 2023-2024, fossil fuel corporations paid only AUD$22.8 billion in corporate income tax – just 5% of their AUD$436 billion in total reported income – while 26 out of 80, or one in every three large fossil fuel corporations, did not pay corporate income tax at all.

      The polluters are not struggling to pay for the damage they cause. They are choosing not to.

      This is the moral obscenity at the heart of the climate crisis: the money exists. It is simply flowing in the wrong direction. And nowhere is that clearer than in the funds the world built to protect the vulnerable, now left to languish.

      Funds struggle to fill their coffers

      The Fund for Responding to Loss and Damage (FRLD) has received US$2.8 billion in requests from 119 countries. And Nepal has sought an urgent US$20 million for immediate needs. Yet the Fund has only US$342 million in total to give.

      The Pacific Resilience Facility – a fund the Pacific designed for itself, to prepare its own communities – sits well short of even its modest US$500 million capitalisation target. And the Adaptation Fund is running on empty. While adaptation needs in developing countries could reach US$387 billion a year by 2030, according to the latest UNEP Adaptation Gap report, the Fund’s resource mobilisation target of a modest US$300 million for 2025 fell far short, with only US$135 million pledged.

      This is a matter of priorities, not of resources. For decades, the world has accepted a simple principle – the polluter pays principle – whether through the OECD, of which Australia is a member, or Europe’s carbon pricing. New York and Vermont have already passed laws to make Big Oil pay into climate superfunds, and ten more US states are moving to follow.

      The idea is neither radical nor new. It’s time to make big polluters pay.

      Comment: After Hormuz, Nepal and wildfires, people want action to make polluters pay

      What is urgently needed is the courage to apply it to the fossil fuel corporations that have spent decades avoiding it. In November, Australia takes up the presidency of the COP31 negotiations, committing to stand shoulder to shoulder with its Pacific neighbours.

      Australia, together with the Turkish COP31 Presidency, must guide and inspire progress at the upcoming climate conference, including on new climate finance pledges by developed countries (which agreed to mobilise at least $300 billion by 2035) and triple the funds available to the FRLD, the Adaptation Fund and the other UN climate funds.

      Rich countries agreed to these goals two years ago at COP29. Yet, the reality is that developing countries’ need for climate finance is in the trillions annually, while developed countries continue to delay providing even what they have already committed. A clear signal recognising the importance of delivering the promised climate finance must come at next week’s Pre-COP in the Pacific, and COP31 in Antalya must go on to deliver against existing promises or risk an irreparable breakdown in trust.

      Time for a climate pollution levy

      Countries must also ensure funding for loss and damage takes its rightful place as the third pillar of climate finance, alongside mitigation and adaptation, in negotiations regarding the UNFCCC climate finance work programme and Article 9 on shifting finance flows towards a low-carbon, resilient world.

      Australia, as President of Negotiations and as a Pacific nation, cannot ask the world to fill these funds while it lets its own coal and gas giants off the hook. Australia should not only stop approving new and expanded coal and gas mines, it should also introduce a Climate Pollution Levy on big coal, oil and gas corporations – a charge on every tonne of carbon pollution they extract and profit from. Independent analysis shows such a levy could raise tens of billions of dollars a year, and can be designed so the cost falls on the corporations, not on households.

      This is not charity – it is compensation. It is the beginning of accountability. And the public is far ahead of its leaders: eight in 10 people worldwide, and a clear majority of Australians, want fossil fuel firms taxed to pay for the damage they cause.

      Fossil fuel expansion threatens COP31 hosts’ credibility, experts warn

      The money must go where the harm lands. A Climate Pollution Levy should feed the funds frontline communities are relying on – fully capitalising the Pacific Resilience Facility this year, replenishing the Adaptation Fund, and delivering the billions the loss and damage fund needs.

      It is essential for these funds to be able to provide grant-based finance that reaches communities directly, not more loans that push drowning nations deeper into debt. With Nepal’s recovery costs estimated at around 10% of the country’s GDP, if we leave it to fend for itself without loss and damage funding, Nepal will likely be saddled with debt and could fail to recover adequately, increasing poverty and inequality.

      We have heard enough empty pledges. We have watched enough funds announced with fanfare, only then to be starved in silence. The era of asking polluters politely is over. Australia, as COP31 president, has a rare chance to prove that the polluter pays principle means something and apply it to those who have profited the most.

      The post As COP31 co-host, Australia should make its polluters pay for climate damage appeared first on Climate Home News.

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      What’s on the climate calendar for October 2026?

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      This is a republication of October’s edition of The Climate Agenda – a subscriber-only newsletter designed to keep you informed of the key events, negotiations and announcements happening every month. If you want to receive The Climate Agenda straight to your inbox at the start of each month, sign up as a subscriber today.

      This month, we’ll be on the ground reporting from the Convention on Biological Diversity summit in Yerevan, Armenia later this month and following all the developments as we build towards COP31 in Antalya, Türkiye next month. Here’s what you need to know for October, why it matters and what to expect.

      Brazilian Election

      First round: Sunday 4 October – Second round: Sunday 25 October

      This poll is being closely watched by Brazilian environmentalists as it’s likely to make a big difference to Brazil’s international climate politics and the health of the Amazon rainforest.

      The two clear front-runners are current left-wing President Lula and right-wing Flávio Bolsonaro. Flávio is the son of Jair Bolsonaro, who ruled from 2019 to 2023 but was declared ineligible to hold public office because of his attacks on the electoral system and is now under house arrest.

      In the unlikely event that either candidate wins more than half the votes in the first round, they will be elected as the country’s leader. Latest polls have Lula on 39% and Bolsonaro on 35% (though the numbers are shifting) with several minor candidates in the single-digits. If none of them get a majority, there will be a one-on-one run-off on October 25.

      The Latin American nation is set to record its lowest-ever level of deforestation, as efforts to rein in illegal clearing and restore Indigenous rights progressed under Lula. But Brazilian experts are warning that the huge agribusiness lobby in Congress, whose interests shape what happens in the Amazon, will be emboldened if Bolsonaro takes power, with the Supreme Court also risking a turn to the right.

      As for climate politics, some seasoned watchers fear that Flávio – a climate change denier like his dad – could even try to pull Brazil out of the Paris Agreement. That would leave other countries to take forward Brazil’s COP30 global roadmaps on transitioning away from fossil fuels (TAFF) and ending deforestation – both of which are due to be delivered by COP31.

      For Brazil’s own TAFF roadmap – commissioned earlier this year but so far nowhere to be seen – the election may have less of an impact, given Lula is as keen as any other politician to extract oil and gas from the Amazon, amid cross-party support for fossil fuel production.

      Read more: Brazil leads “encouraging” decline in global rainforest destruction in 2025

      What does the UN say about countries protecting oceans?
      The Pacific nation of Tuvalu is facing an existential threat due to the impact of climate change on rising seas. (Photo: Theo Rouby / Hans Lucas via REUTERS)

      Pre-COP

      Monday 5 October – Thursday 8 October – Fiji and Tuvalu

      The annual Pre-COP meeting is usually a business-like gathering of government negotiators, sounding out each other’s positions and laying the groundwork for deals at the main COP summit. But this year’s “pre” has been jazzed up by Australia’s partnership with Pacific governments keen to elevate their climate issues on the international stage.

      “We will bring the eyes of the world to our region, highlight the threat that climate change poses to it, and show how Pacific voices are shaping global action to counter it,” Australian PM Anthony Albanese said of the event.

      On Monday, before the Pre-COP officially starts, a group of senior government figures – including a handful of leaders – will visit the world’s second lowest-lying nation Tuvalu, as UN boss Antonio Guterres did in 2019.

      They will visit areas affected by sea level rise, see climate resilience projects and meet local communities before flying 2.5 hours south to Fiji to join up with the Pre-COP – which starts on Tuesday – and speak at a “Leaders’ plenary session” that evening.

      The Pre-COP runs until Thursday. Governments are expected to try to advance on some kind of a roadmap for protecting oceans from climate change, while Fiji says Pacific nations will emphasise the need to follow science and step up efforts to limit warming to 1.5C.

      Australia is also due to present an action plan to improve access to climate finance for small island nations and least-developed countries, so that governments, development banks and climate funds can endorse it ahead of the Antalya summit.

      Alongside the official Pre-COP discussions, a “green zone” will host talks organised by civil society on topics like public transport, carbon markets and the International Court of Justice advisory opinion. Unfortunately, these events won’t be available to follow online.

      Read more: Threatened by rising seas, small islands secure right to keep their statehood

      Read more: At regional summit, Pacific islands ask for COP31 support for clean energy and finance

      Forest clearance for a palm oil plantation in Indonesia on 1/4/2018 (Ulet Ifansasti/ Greenpeace)

      Article 6.4 Supervisory Body

      Monday 5 October – Friday 9 October – Bonn, Germany

      The UN carbon market’s rule-making body meets for one last jam-packed session ahead of COP31, with decisions pending on several high-stakes issues that could shape the future of the new crediting mechanism.

      Top of the agenda is a rulebook for clean cooking projects, which aim to cut greenhouse gas emissions by distributing more efficient cookstoves. These projects generate some of the most popular carbon credits but have also drawn some of the heaviest criticism for overstating their climate benefits through lax accounting.

      Technical experts have recommended the Supervisory Body tighten the rules compared to existing crediting programmes, including by forcing cookstove project developers for the first time to guard against the risk of the climate benefits of their credits – the trees saved from becoming cooking fuel – being wiped out by fire, drought or logging.

      The proposal on the so-called reversal risk assessment has sparked a “coordinated” lobbying campaign from the industry, some conservation NGOs and UNEP, arguing that stronger protections could hike project costs and restrict the supply of credits.

      Read more: Industry and NGOs lobby to weaken UN carbon credit rules in “coordinated” push

      Intergovernmental Panel on Climate Change (IPCC) plenary

      Monday 12 October – Friday 16 October – Addis Ababa, Ethiopia

      Scientists and government officials will try, once again, to agree on a timeline to produce the highly influential AR7 assessment report from the UN’s climate science body.

      The faultlines that have blocked a deal at several previous sessions are well established: a large group of predominantly developed countries, small island and progressive Latin American states and the poorest nations want the reports to be ready in time to inform the UN’s next global assessment of climate action, due to be completed in November 2028.

      A small group of primarily big emerging economies disagree, claiming this timeline would put a burden on developing countries with limited resources and restrict their ability to provide scientific input into the process.

      Three options will be on the table in Addis Ababa. Two of them would see all three flagship assessment reports approved by July 2028 and September 2028 respectively, just in time to feed into the second Global Stocktake.

      The third, based on proposals from Saudi Arabia and India, would deliver only the Working Group 1 report, on the physical science of climate change, by May 2028. The reports from Working Groups 2 and 3, covering climate impacts and ways to cut emissions, would not be approved until mid-2029, well after the stocktake concludes at COP33.

      Delegates are also expected to discuss the IPCC’s increasingly strained budget, made worse by a funding gap left by the withdrawal of the United States. The panel has warned that, without a sustained increase in contributions, its trust fund’s cash balance would run out by the end of 2028, putting the delivery of the AR7 set of reports at risk and forcing cuts to in-person meetings, translation and outreach.

      Read more: Science ‘under attack’ from fossil fuel interests at UN climate talks

      Read more: As science comes under attack at UN talks, climate movement splits over how to respond

      A small group of climate activists gather in front of the International Monetary Fund (IMF) and the World Bank Group 2025 Annual Meeting on October 16, 2025 in Washington, DC.
      A small group of climate activists gather in front of the International Monetary Fund (IMF) and the World Bank Group 2025 Annual Meeting on October 16, 2025 in Washington, DC. (Photo: Andrew Harnik/Getty Images)

      World Bank & IMF Annual Meetings

      Tuesday 12 October – Sunday 18 October – Bangkok, Thailand

      With their biggest shareholder – the US – resolutely opposed to climate action, the World Bank and International Monetary Fund (IMF) are likely to try to avoid mentioning climate change at their annual meetings in Bangkok – and there are no headline events on the subject.

      But they aren’t in complete control of the agenda. Thailand will host a discussion on financing a green resilient economy and World Bank President Ajay Banga is likely to be challenged on climate at a live-streamed civil society townhall on October 12.

      With tricky negotiations on the World Bank’s climate finance target concluded earlier this year (it was dropped), talks are moving on to the sustainability framework of the World Bank’s International Finance Corporation, which invests in the private sector. Civil society is calling for its rules on protecting people and the planet to be maintained and strengthened.

      The IMF’s guidance note to staff – which shapes the circumstances under which climate can be included in IMF programmes – will also be negotiated. Longer term, the Resilience and Sustainability Trust, which channels funding to green projects, will be reviewed but not before 2028 at the earliest.

      Read more: World Bank’s climate work can endure without finance target, experts say

      Convention on Biological Diversity (CBD) COP17

      Monday 19 October – Friday 30 October – Yerevan, Armenia

      The biodiversity COP – a sister convention to the UN climate process – will for the first time take stock of progress towards key goals in its 2022 landmark agreement, the Global Biodiversity Framework (GBF). These include a headline target to protect and conserve at least 30% of the planet’s land and marine ecosystems by 2030.

      A draft report prepared by a scientific panel warns that “unless collective implementation accelerates rapidly, the 2030 targets and mission will not be achieved”. In fact, governments are failing on 22 out of 23 targets. The final report is expected to be published ahead of COP17, where governments are expected to react strongly.

      UN biodiversity chief Astrid Schomaker told journalists earlier this month that the most significant progress is expected to occur towards the end of the decade, as 174 countries took the first four years to develop national targets.

      Finance, meanwhile, is set to become a contentious issue, as the draft report says developed countries fell short on a target to provide $20bn per year in international public finance for nature protection, reaching only about $17bn per year from 2020 to 2023. They have also yet to meet a wider goal to mobilise $200bn per year counting all kinds of finance.

      Much like in climate talks, the EU has proposed to broaden the base of donors to include emerging economies who want to “voluntarily assume the obligations” of developed countries. Saudi Arabia and Qatar want nothing to do with this proposal. China has said bringing in new contributors should not weaken the obligations of developed countries. Expect a fight in Yerevan.

      A preliminary meeting in Nairobi in August resulted in a heavily bracketed text that delegates will have to unravel in Armenia. One observer said countries had “overall missed the level of urgency” needed.

      Keep an eye out for our webinar live from Yerevan later this month, where we’ll provide an update on the talks and how governments are responding to science’s demands for quicker action.

      Read more: Mombasa ocean summit drives progress on marine protection, but threats persist

      Read more: UN biodiversity talks agree finance roadmap, postponing decision on a new fund

      European Climate Resilience & Risk Management Framework

      Wednesday 28 October – Brussels, Belgium

      Following a torrid summer beset by recurring heatwaves, drought and outbreaks of forest fires across the continent, the European Commission will present its keenly awaited climate resilience and risk management framework to help member states protect their populations from worsening climate change impacts.

      As part of the policy package, the Commission will identify 100 of Europe’s most climate-vulnerable territories. And alongside an assessment of the risks, there will be guidance at which level they should be managed – regional, national or by the EU. Currently, confusion often arises over who is responsible for preventing, preparing for and managing disasters across the bloc.

      The framework will also aim to make Europe a “champion in adaptation technologies” – such as drought-resistant crops, flood prevention or energy-efficient cooling – which have been described by EU President Ursula von der Leyen as “a huge emerging market”.

      With only around a quarter of catastrophe losses in Europe covered by private insurance, the Commission also plans to set up a Climate Insurance Alliance to boost that figure.

      READ MORE: WHO issues new guidance on heat-health action plans, as El Niño sets in

      The post What’s on the climate calendar for October 2026? appeared first on Climate Home News.

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