Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
This week
World court’s ‘landmark’ climate opinion
POLLUTERS ‘ACCOUNTABLE’: The UN’s highest court has told “wealthy” countries “they must comply with their international commitments to curb pollution or risk having to pay compensation to nations hard hit by climate change”, reported Reuters. The International Court of Justice (ICJ) issued a much-awaited advisory opinion that small island states have described as a “legal stepping stone to make big polluters accountable”, the newswire added.
‘INHERENT RIGHT’: The Associated Press said that, during a two-hour hearing to present the unanimous opinion, Japanese judge Yuji Iwasawa told the court that the “human right to a clean, healthy and sustainable environment is…inherent in the enjoyment of other human rights”. The newswire said activists described this as a “turning point in international climate law”.
‘LEGAL WEIGHT’: The Times noted that the “view is non-binding on governments, including the [UK], and the US does not recognise the court’s jurisdiction”. However, the “ICJ’s advisory opinions carry great legal weight and are seen to contribute to the clarification of international law”, the newspaper added. Carbon Brief has just published an in-depth Q&A on what the opinion means for climate change.
Renewables ‘breakthrough’
BRINK OF BREAKTHROUGH: UN secretary-general António Guterres said on Tuesday that the “world is on the brink of a breakthrough in the climate fight and fossil fuels are running out of road”, the Guardian reported, as two new reports were published illustrating the growing dominance of renewable energy. In his online speech, Guterres said the global energy transition is now “unstoppable” due to “smart economics”.
RENEWABLES ‘CHEAPER’: The first of the new reports, from the International Renewable Energy Agency (IRENA), said that around 90% of renewable power projects globally are now cheaper than fossil fuel alternatives, Reuters said. The second, from the UN drawing on data from multiple international agencies, found that renewables made up 92.5% of all new electricity capacity additions and 74% of electricity generation growth in 2024, the Financial Times reported. Carbon Brief pulled out five key takeaways from both reports.
Around the world
- IN DANGER: The Trump administration has “drafted a plan to repeal a fundamental scientific finding”, known as the “endangerment finding”, that “gives the US government its authority to regulate greenhouse-gas emissions and fight climate change”, reported the New York Times.
- EU-CHINA SUMMIT: The EU and China have “committed to leading the world in the fight against climate change” in a joint statement released on Thursday following a meeting between the two superpowers, Bloomberg said. Carbon Brief’s China Briefing newsletter provided more details.
- JAPAN EYES NUCLEAR: A Japanese utility has become the first since the Fukushima nuclear disaster 14 years ago to take steps towards building a new reactor, reported Channel News Asia.
- SHELL QUITS INITIATIVE: Shell and other fossil-fuel companies have “abandoned” a six-year-long attempt to define a net-zero emissions strategy “after being told that such a standard would require them to stop developing new oil and gas fields”, according to the Financial Times.
- FLASH FLOODS: Ongoing flash flooding in Pakistan has killed at least 266 people over the past month, the Hindu reported.
50C
The temperature in some parts of Iran this week – as authorities asked people to limit drinking water amid an ongoing drought crisis, reported the Guardian.
Latest research
- Climate change is creating “new vulnerabilities” for pandemics | Carbon Brief
- South American lands stewarded by “Afro-descendant” people coincide with areas with “high biodiversity” and are associated with a 29-55% reduction in forest loss, compared to control sites | Communications Earth & Environment
- The “true price” of solar geoengineering is “much higher than its modest technical costs would indicate” | npj Climate Action
(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)
Captured

New research covered by Carbon Brief this week found that one in three people in informal settlements in the global south live in floodplains and are at risk of a “disastrous flood”. The chart above draws on data from the study, published in Nature Cities, to illustrate where in the world has the highest number of “slum residents” living in floodplains.
Spotlight
Antarctica’s oldest ice arrives in UK
Carbon Brief recently visited British Antarctic Survey scientists responsible for uncovering the secrets of Antarctica’s oldest ice.
Standing in a freezer in Cambridge – with a -25C chill licking at his nostrils – British Antarctic Survey (BAS) lab manager Jack Humby excitedly opens up an unassuming polystyrene box.
Using his bare hands, he pulls out its contents. Long square-shaped sections of crystal clear ice – wrapped in plastic labelling which way is up – are revealed.
Little about the appearance of the ice gives away that it is at least 1.2m years old.
It has journeyed to the BAS headquarters on the outskirts of Cambridge from an ice core drilling camp in East Antarctica.

In January, scientists at the camp vertically drilled a 2,800m-long ice core, with on-site tests revealing it was likely to be at least 1.2m years old. The ice was then flown to a nearby port and shipped to Europe aboard the Italian icebreaker Laura Bassi.
The ice was drilled as part of the Beyond Epica Oldest Ice project, a large-scale field operation involving multiple research teams and laboratories across Europe.
‘One shot’
Owing to its specialist equipment and research expertise, BAS has been tasked with analysing the ice to reveal its secrets.
Though not visible to the human eye, the ice contains organic compounds and tiny pockets of air from periods stretching back hundreds of thousands of years.
Over the next seven weeks, the research team at BAS will work around the clock to analyse these features. However, in order to do so, they will have to melt the ice.
Dr Liz Thomas, head of the ice cores team at BAS, told journalists:
“It’s a huge responsibility because this is a one shot. Given how much effort has gone into drilling these cores, we have to get this absolutely right.”
To conduct their analysis, the team plan to use a gold-plated instrument to melt the square-shaped sections of ice being stored in the freezer room.
The meltwater will then be piped into a specially designed lab next door, which contains millions of pounds worth of analysis equipment, according to Humby.
Climates past
The analysis will help scientists work out how old the ice actually is. Though initial tests suggest it is at least 1.2m years old, but the team believe it could be up to 1.5m years old or even older.
It will also enable researchers to paint a more detailed picture of Earth’s past climates.
In turn, this could inform scientists’ understanding of how large swings in temperature in the past have affected various parts of the Earth climate system, including its ice sheets and ecosystems.
Ultimately, this could help researchers to make more informed projections about the likely impacts of human-caused climate change, Thomas explained:
“As climate scientists, it’s our job to provide as much information as we can. What we’re relying on to understand the next steps is climate models. They are fantastic, but they’re only as good as the information we put into them. That really is the justification for looking back in time.”
Watch, read, listen
COP30 LOOMS: A long-read in the Brazilian culture magazine Piauí examined the fraught road that the nation faces to host the next UN climate summit in November.
ARCTIC ‘MELTING POINT’: In Nature Communications, researchers recounted how the Arctic island of Svalbard is facing a “dramatic shift” to high air temperatures and rainfall in the depths of winter.
STUDENT VICTORY: The Guardian spoke to a group of students from the Pacific islands who started the campaign for the world’s top court, the ICJ, to take on the issue of climate change.
Coming up
- 23-31 July: COP15 of the Ramsar Convention on Wetlands, Victoria Falls, Zimbabwe
- 30 July: International Energy Agency electricity mid-year update
- 30 July: Advancing the implementation of the Chilean framework Law on Climate Change, Santiago, Chile
Pick of the jobs
- Boston Globe, climate science and environment reporter | Salary: Unknown. Location: Boston, US
- Science Museum London, curator of climate and earth sciences | Salary: £41,770. Location: London
- Netflix, manager, sustainability standards and partnerships | Salary: Unknown. Location: Amsterdam, Netherlands
DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.
This is an online version of Carbon Brief’s weekly DeBriefed email newsletter. Subscribe for free here.
The post DeBriefed 25 July 2025: World court delivers climate ‘turning point’; Renewables ‘unstoppable’; Antarctica’s oldest ice examined appeared first on Carbon Brief.
Climate Change
Battle over cleaning up shipping set to resume at London talks
The US is expected to resume its attempt to sink measures for a greener global shipping sector at closed-door talks between governments at the International Maritime Organization (IMO) in early September.
The US and oil-producing allies like Saudi Arabia want to weaken a proposed plan for cleaner fuels that aims to reduce planet-heating emissions from the industry, which relies heavily on dirty bunker fuels. Shipping currently represents 3% of global emissions.
Those that want a softer system are likely to back a Liberian proposal which expert analysis suggests would see emissions fall by only half at most by 2050, far short of the sector’s agreed climate goals.
After several years of debate, governments provisionally agreed in April 2025 on the “Net Zero Framework” (NZF), a series of emissions reduction targets for shipowners, backed up with financial rewards for meeting the targets and fees for missing them.
But in October 2025, after a high-profile intervention from US President Donald Trump and threats of sanctions and visa restrictions, the US convinced a majority of voting nations to postpone the adoption of the NZF for a year.
Ralph Regenvanu, climate minister for the Pacific nation of Vanuatu, called the delay “unacceptable” given the urgency of accelerating climate change.
After a round of low-profile talks in May, the first of three further sets of talks on how to clean up shipping will begin at the IMO’s riverside headquarters in London on Tuesday, culminating in a final public session in November.
Em Fenton, who follows the talks as senior director of climate diplomacy at Opportunity Green, an NGO focused on aviation and shipping, said governments should not be sidetracked by alternative proposals to the NZF, calling them “a distraction from a hard-fought multilateral compromise”.
“If countries want to deliver a just and fair maritime transition, there is really only one choice: back the NZF and stand together in solidarity against those who would tear it apart,” Fenton added.
Five proposals on the table
Governments will discuss five different proposals submitted in advance of next week’s meeting. The most ambitious of these is from the Pacific island nation of Tuvalu, which has proposed a levy on the entirety of a ship’s emissions rather than just those above a certain level, as the NZF envisions.
That had been the original demand of Pacific nations before the NZF was provisionally adopted in April 2025. At the time, Tuvalu’s transport minister Simon Kofe described the NZF as disappointing and not ambitious enough.
For this reason, six Pacific countries abstained in the vote on the NZF. While they supported the original plan for its adoption in October 2025, they have used the delay to push again for more ambition.
John Kautoke, advisor to a group of Pacific nations called 6PAC+, told Climate Home News that the NZF “cannot diminish its already inadequate ambition. If anything, the NZF must increase in ambition if we are going to renegotiate its parameters.”
Analysis by the Institute of Marine Engineering, Science and Technology (IMarEST) suggests that, of the five proposals, only Tuvalu’s would meet the 2030 and 2040 emissions reduction targets for global shipping that were agreed by governments in 2023. Those were for cuts of 20% between 2008 and 2030, 70% by 2040 and then reaching net zero “by or around, i.e. close to 2050”.
Despite this, the UK, Australia, Canada and South Africa have formally proposed that governments adopt the NZF, which won support in a 63-13 vote among governments at the April 2025 talks. Trump’s US walked out halfway through.
According to IMarEst’s analysis, while the NZF proposal will not be enough to meet the industry’s targets, it will reduce emissions more cheaply than the Pacific proposal.
A proposal by Brazil – which fought hard for the NZF last October – suggests tweaking the framework to make meeting targets easier in the short term and harder in the long term.
While this compromise will make it more appealing to the owners of polluting ships and countries that support them, IMarEst estimates it would lead to higher cumulative emissions than either the NZF or Pacific proposals.
The NZF stipulates that fees for high-polluting shipowners should be be put into a Net Zero Fund and used to promote clean shipping fuels and a fairer transition. The Brazilian proposal would delay raising and spending these funds by two years, from 2029 to 2031.
Liberia’s proposal weakens emissions cuts
The US and Saudi Arabia are likely to swing behind a new proposal from Liberia, whose government makes millions of dollars a year selling the right for shipowners to register their vessels in the small West African nation via a US-based company.
This proposal would weaken the emissions reduction targets. IMarEst says it would cut the industry’s emissions at most by a half by 2050, falling far short of the target agreed in 2023 for international shipping to reach net zero “close to 2050”.
It would also replace the NZF’s fees for missing targets with a carbon trading system. As a result, there would be no Net Zero Fund and therefore less money available to incentivise green fuels and make the transition more equitable for poorer nations.
Pacific advisor Kautoke said that, as well as preventing shipping from reaching zero emissions by 2050, Liberia’s proposal would mean the Pacific “will not receive any support to deal with the disproportionately negative impacts created by the cost of the transition”.
“We get a double blow if we adopt the Liberian proposal,” he warned. “We get all the cost of a transition without any support, and we have an industry that continues to burn fossil fuels to an unforeseen point.”
Japanese proposal favours shipowners
Japan has submitted a late proposal to amend the NZF so that shipowners have more control over how the fees they would pay for emitting above a set threshold are spent.
University College London professor Tristan Smith has argued that this change means there will be no central mechanism to incentivise investments in clean fuels. He wrote on LinkedIn that under the system put forward by Japan, shipowners would be able to select which green projects their fees would go to. They could choose their own or those of a sister company or other shipowners, rather than funding broader just transition projects that would benefit marine workers or developing countries hit by rising shipping costs.
Despite its flaws, Smith added that Japan’s proposal “could still get taken seriously by some, given how appealing it may seem to shipowners who have consistently demanded control of revenues, and given how the US and other member states have pushed back against the IMO Net Zero Fund and [greenhouse gas] pricing.”
Tacit or explicit approval?
Next week, governments are expected to make statements saying which proposals – or which aspects of proposals – they prefer. Another set of talks will be held from November 23-27 before a potentially final round from November 30-December 4.
A new framework to tackle shipping emissions could be adopted at those talks if two-thirds of countries that are present and signed up to a regulation called Marpol Annex VI – endorsed by just over 100 states – vote in favour of it, as they did in April 2025.
The US and its allies are also trying to change the rules to make the next stage more difficult. Decisions that have been adopted at IMO meetings usually take effect automatically unless a certain number of countries object within a certain time period decided by governments, a system known as tacit approval.
But the US wants that to require explicit approval instead, so that any new emissions standard would not come into force unless enough governments – representing a certain percentage of the world’s shipping fleet – actively indicate support for it.
Critics say this change would give a small number of countries with large shipping registries the power to block implementation. Liberia has the world’s biggest shipping registry, run by an American company, followed by Panama and the Republic of the Marshall Islands.
Liberia and Panama have supported the US at the talks on the Net Zero Framework. The Marshall Islands has long been one of the most vocal supporters of climate action in shipping but, with its officials and shipping registry income vulnerable to US retaliation, did not sign on to the recent Pacific proposal vowing to strengthen the NZF if it is re-opened.
Brazilian negotiator Adriana de Medeiros Gabinio warned in April that the NZF’s opponents are trying to change the rules by which it comes into force as a “safety net to block” it.
The post Battle over cleaning up shipping set to resume at London talks appeared first on Climate Home News.
Battle over cleaning up shipping set to resume at London talks
Climate Change
Coles, Woolworths failing on deforestation commitments
SYDNEY, Wednesday 26 August 2026 — New 2026 Sustainability Reports released by supermarket giants Coles and Woolworths this week demonstrate the retailers are failing on their commitments to end deforestation in their supply chains.
Adele Chasson, Nature Policy Lead at Greenpeace Australia Pacific said:
“These so-called sustainability reports are revealing. Despite their public commitments in 2024 and 2025, neither Coles nor Woolworths have taken deforestation-linked beef off their shelves. Meanwhile, bulldozers continue to tear up forests and bushland, pushing wildlife closer to extinction and causing mass toxic runoff to flow into the Great Barrier Reef. Millions of native animals like koalas are losing their homes to beef pastures each year, while the big supermarkets put off action.
“Australians would be shocked to know that beef on the shelves of our biggest supermarkets could be pushing threatened species to the brink of extinction. Collectively Coles and Woolworths have made more than $2 billion in profits in the last year, profiting from the destruction of wildlife and precious Australian nature. Coles and Woolworths owe it to shoppers to deliver on their promises and end deforestation in their supply chains now.
“As big beef buyers, Coles and Woolworths have an essential role to play in keeping Australia’s unique forests standing. They can help stop the Great Barrier Reef from being poisoned by runoff and protect iconic forest wildlife by taking deforestation off their shelves. It’s time these big companies put their money where their mouths are and follow through on their promise of sourcing and supplying deforestation-free beef.”
Climate Change
New Zealand moves to protect business with law curtailing climate litigation
New Zealand’s parliament has adopted a controversial new law blocking a whole avenue of climate litigation and shutting down its most advanced corporate lawsuit, which has been blamed by the government for shaking business confidence and investment.
The Climate Change Response (Tort Liability) Amendment Bill, expected to take effect in the coming days after it is formally signed by the Governor-General, prevents all current and future civil claims for climate loss or harm under tort law.
Justice minister Paul Goldsmith said last week that the aim was to give businesses “certainty around their climate change obligations”, noting it would not alter the government’s responsibilities under the Climate Change Response Act 2002 nor business obligations under the Emissions Trading Scheme.
“Our response to climate change is best managed by the Government at a national level and not through piece-meal litigation in the courts,” he added in a statement.
Such litigation, he said, “risks developing a new regime that contradicts the framework Parliament has already enacted” to tackle climate change.
Goldsmith singled out a key domestic climate lawsuit brought by Northland iwi leader and activist Mike Smith against six big companies: dairy firms Fonterra and Dairy Holdings, energy firms Genesis Energy and Z Energy, New Zealand Steel and coal mining firm BT Mining. A seventh original defendant, Channel Infrastructure, was dropped after it permanently decommissioned its Marsden Point oil refinery.
Smith argued that these companies had caused him harm under public nuisance and negligence law, as well as a third breach of a duty to cease contributing to climate change that has yet to be tested domestically. He did not seek financial compensation, instead asking for the companies to immediately stop emitting or contributing to net greenhouse gas emissions.
In one of the most advanced corporate climate accountability lawsuits in the world, a trial had been scheduled for April 2027 after the Supreme Court unanimously allowed the case to continue.
Corporate lobbying in the shadows
Smith described the passing of the bill as “deeply concerning”, particularly as it coincided with the Supreme Court hearing another of his climate lawsuits. In that case, Smith v Attorney-General, he argues that the government’s response to climate change and its impacts on Māori communities in particular breaches rights to life and culture.
“That timing raises profound questions about the separation of powers and the rule of law,” said Smith. “Whatever one’s view of the merits of these cases, it is deeply troubling when parliament intervenes to remove a legal pathway while the courts are actively considering fundamental questions about climate responsibility, rights and the crown’s obligations.”
The bill – which says that no person (including the government) can be found liable in tort for emissions-related climate change effects – followed major lobbying efforts by the companies defending themselves in Smith’s lawsuit. They outlined a proposed legal amendment in a briefing note to the government in 2024.
The centre-right government has been fiercely criticised over its lack of transparency in relation to this lobbying activity. The national ombudsman recently found that the Prime Minister’s Office effectively withheld information requested by the Environmental Law Initiative about meetings, discussions and conversations regarding Smith’s case.
Green groups fail to stop bill
The bill sparked huge concern among environmental campaigners in New Zealand and elsewhere. Greenpeace Aotearoa called it a “shocking abuse of executive power” and the vast majority of submissions to a parliamentary inquiry said it should be rejected.
But in the end, it was adopted with little resistance, moving relatively smoothly through parliament, passing its third reading by 67 votes to 53. Sam Bookman, climate law lecturer at Melbourne Law School, told Climate Home News he was not surprised by this, given that the coalition government has a secure majority.
A complaint has been made to the UN special rapporteur on climate change and human rights by Smith, the National Iwi Chairs Forum Pou Tikanga and youth coalition Climate Clinic Aotearoa over what they see as the government’s heavy-handed approach. Smith is also challenging the new law in yet another lawsuit.
“Pathetic”: New Zealand plans to barely cut emissions between 2030 and 2035
Bookman thinks it “very unlikely” that such a challenge will succeed, noting that New Zealand’s constitution is firmly anchored in parliamentary sovereignty.
But the expert in climate law does not see the bill as the end of legal action in the country, noting that New Zealand has a “sophisticated climate litigation landscape with a growing number of specialist and experienced lawyers and NGOs”.
The country is also approaching its next general election in November, and some opposition parties have pledged to restore access to the courts if elected.
Amanda Larsson, global project lead on agriculture for Greenpeace International, said: “This law deserves to be tested, and I strongly encourage the international climate litigation community to unite and help defend New Zealanders’ fundamental right to hold polluters accountable before this becomes a global blueprint.”
Copycat legislation on the rise
New Zealand’s move is part of a small but growing legislative effort to shut down climate litigation around the world.
In the US, Republican politicians introduced legislation in the House and Senate in April that would shield fossil fuel firms from climate liability lawsuits. Similar laws have already been passed at state level in Tennessee, Utah, Iowa and Louisiana.
The German state of Bavaria has put forward a similar proposal to the Federal Council, aiming to block private climate claims as well as the recognition and enforcement of foreign judgments imposing such liability. There are also proposals to limit available remedies and actions in the Netherlands and Belgium.
UN General Assembly backs “climate obligations” set by world’s top court
Bookman said he expects more efforts to counter climate damages litigation and advised plaintiffs to think about how to respond, including drawing on broader support in opposing them.
“Even though it’s very hard for plaintiffs to win these types of cases, companies are very eager to avoid the expense, embarrassment and political accountability that come even with unsuccessful lawsuits,” he said.
The post New Zealand moves to protect business with law curtailing climate litigation appeared first on Climate Home News.
New Zealand moves to protect business with law curtailing climate litigation
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