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Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.

This is an online version of Carbon Brief’s weekly DeBriefed email newsletter. Subscribe for free here.

This week

Carbon Brief investigates offsets

SPECIAL WEEK: After months of interviews, research and data-crunching, Carbon Brief this week published a special series of content on the topic of carbon offsets. On the first day, Carbon Brief launched an in-depth explainer on whether carbon offsets can help to tackle climate change, a glossary laying out more than 60 of the key terms and phrases, an infographic illustrating the typical journey of a carbon offset and a timeline detailing the 60-year story of how offsets went from an idea to make polluters think about their damage to a major feature of country and business climate targets.

MAPS AND DATA: Later on in the week, Carbon Brief published an interactive map detailing the impacts of individual carbon-offset projects around the world. We also released a series of in-depth Sankey diagrams illustrating how offsets flow from the world’s most polluting companies to projects in the developing world. Separately, we published an explainer into how “biodiversity offsets” are rising in popularity, posing comparable moral questions to carbon offsets.

WEBINAR: Carbon Brief finished its special week by holding a webinar on whether carbon offsets can be reformed. It featured Dr Barbara Haya, director of the Berkeley Carbon Trading Project at the University of California, Berkeley; Kaya Axelsson, net-zero policy engagement fellow at the University of Oxford; Laura George, governance and rights coordinator of the Amerindian Peoples Association in Guyana; and Pedro Barata, associate vice president of carbon markets at the Environmental Defence Fund and co-chair of the Integrity Council for the Voluntary Carbon Market’s expert panel. The webinar is now available to watch online.

UK ushers in more oil and gas

ROSEBANK APPROVED: In the latest twist in a remarkable month for UK climate policy, regulators this week granted final approval to the Rosebank oil-and-gas field, one of the largest new fossil-fuel projects in the North Sea in decades. The project has the potential to produce 300m barrels of oil and gas. When burned, this would produce the equivalent to the annual emissions of around 90 of the countries with the lowest emissions, according to analysis by Carbon Brief’s Dr Simon Evans.

TORY TURMOIL: The decision sparked more strife within the country’s ruling Conservative party. According to the Independent, Conservative peer and former minister Zac Goldsmith told BBC Radio Four’s PM programme: “It just trashes the UK’s reputation as a reliable, grown-up member of the global community, it’s done us immeasurable harm…The party that loses sight of the overall goal [of climate action and environmental protection] is not one that deserves to be given the privilege of power.” It comes after a frontpage story in the i newspaper on Monday reported that 100 of the country’s economists had written a letter arguing that prime minister Rishi Sunak’s wider climate rollbacks could “raise the cost of living and cost Britain jobs”.

Around the world

  • ‘EXCEPTIONAL’: Antarctica’s sea ice maximum – reached at the height of winter – was the lowest in the 45-year satellite record by “a wide margin”, Carbon Brief reported. One expert said Antarctic conditions had been “truly exceptional”.
  • SPRING SCORCHER: Large swathes of South America have faced an intense spring heatwave, with temperatures reaching 43C in Brazil, Grist reported.
  • SOUTH AFRICA FLOODS: At least 11 people have died after heavy rain and winds struck South Africa’s Western Cape province, BBC News reported. South African newspaper Daily Maverick spoke to scientists about the links to climate change.
  • SHELL-SHOCKED: A leaked open letter posted to Shell’s internal web revealed that some employees have said they are “deeply concerned” about the company’s shift away from investing more in renewable energy, Reuters reported.
  • YOUTH CLIMATE CASE: Six young people from Portugal on Wednesday began legal proceedings against 32 European countries in the European Court of Human Rights (ECHR) for failing to protect them against climate change in an unprecedented case, Euronews reported.
  • NZ FARMER PROTEST: Reuters explored how “rural anger” over New Zealand’s climate policies, including tree-planting on grazing land, could usher in a return of far-right parties in an October election.

10%

The proportion by which the overall volume of Switzerland’s glaciers shrunk in the past two years, according to analysis covered by the Times.


Latest climate research

  • The densely populated, low-lying delta river basins of the Ganges and Mekong in Asia will likely see fewer tropical storms in a warming world, but they will be more intense, according to new research in Geophysical Research Letters.
  • Some 17% and 18% of new wind power projects faced local opposition in the US and Canada, respectively, from 2000-2016, found a study in the Proceedings of the National Academy of Sciences.
  • A new Nature study challenged the idea that climate change is behind the rapid demise of insects globally by identifying the role of complex weather patterns.

(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)

Captured

Global surface temperatures set a new record this week for the highest daily temperature anomalies (departure from the norm) ever observed. They were recorded by a Japanese climate database called the JRA-55 reanalysis product. These were approximately 1C warmer than the 1991-2020 baseline period used by the dataset and around 1.9C warmer than the pre-industrial (1850-1900) temperatures. “El Niño won’t peak until later this year and there is plenty more heat waiting in the wings,” Dr Michael McPhaden, a senior scientist at the National Oceanic and Atmospheric Administration, told the Washington Post, warning that we can “expect more records to be set in the coming months.”

Spotlight

IEA’s path to 1.5C unpacked

A 2023 update to the landmark 2021 Net Zero Roadmap from the International Energy Agency explores how recent developments have impacted the path to limit warming to 1.5C by the end of the century. Here, Carbon Brief summarises three key takeaways from the report.

Extraordinary growth in clean energy technology over the past two years, but more work remains

The IEA’s 2023 report finds that record growth in solar power capacity, battery production and electric car sales since 2021 are in line with their required growth in a world that reaches net-zero emissions by mid-century. Industry plans to expand manufacturing capacity are also in line with what will be required to achieve necessary growth. These two technologies alone are expected to deliver approximately a third of emissions reductions between today and 2030 in the IEA’s net-zero pathway.

The IEA finds that the world is set to invest a massive $1.8tn in clean energy in 2023. But much more work remains: investments in clean energy need to climb to $4.5tn a year by the early 2030s, while global renewable capacity needs to triple by 2030. This requires stronger policies and international support, particularly in emerging markets and developing economies. The IEA also highlights the need to speed up permitting and modernising of electricity grids to better integrate variable renewable generation.

Most of the technologies needed to limit warming to 1.5C are available today

The IEA’s statement in 2021 that technologies not yet available on the market would deliver half of future emissions reductions resulted in a lot of coverage and debate. In its new report, the IEA finds that technological development and commercialisation over the past two years mean that novel technologies are only required for 35% of future emissions reductions. This reflects significant technological development in a number of sectors, including batteries and electrolysers.

However, the IEA emphasises that more progress is needed for a number of technologies. It notes that small, modular clean technologies, such as solar and batteries, are not sufficient to deliver net-zero emissions alone. Also, new infrastructure networks, low-emissions fuels, CO2 capture technology, nuclear power and large land areas for the deployment of renewables will all be necessary.

No room for new unabated coal plants or new ‘long-lead time’ oil and gas projects

The IEA report argues that an immediate end to new approvals of unabated coal plants is required to achieve its net-zero emissions scenario – and that there is no need for new long-lead time oil and gas projects. The rapid reduction in fossil fuel demand (down 25% by 2030 and 80% by 2050) means that current oil and gas projects are sufficient to supply all expected future demand.

However, the IEA does note that some continued investment in existing oil and gas fields is not inconsistent with a net-zero emissions scenario. It argues that it will be important to properly sequence increased investments in clean energy with decreased investments in fossil-fuel supply over time to avoid potentially damaging price spikes or demand gluts.

Watch, read, listen

IDA AFTERMATH: The 19th examined how, two years after Hurricane Ida, residents are still reeling – with women of colour disproportionately affected.

CLIMATE REFUGEES: In African Arguments, South African legal scholar Dr Cristiano d’Orsi argued that laws must be reformed to allow people fleeing from climate change to claim refugee status.

NATURE’S SECRETS: BBC Radio Four’s the Life Scientific podcast spoke to the director of London’s Kew Gardens about how lessons from nature can help the world to address climate change.

Coming up

Pick of the jobs

DeBriefed is written in rotation by Carbon Brief’s team and edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org

The post DeBriefed 29 September 2023: Focus on carbon offsets; UK expands oil and gas; IEA’s path to 1.5C unpacked appeared first on Carbon Brief.

DeBriefed 29 September 2023: Focus on carbon offsets; UK expands oil and gas; IEA’s path to 1.5C unpacked

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Climate Change

Colombia proposes expert group to advance talks on minerals agreement

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Colombia wants countries to discuss options for a global agreement to ensure that the extraction, processing and recycling of minerals – including those needed for the clean energy transition – don’t harm the environment and human wellbeing.

The mineral-rich nation is proposing to create an expert group to “identify options for international instruments, including global and legally-binding instruments, for coordinated global action on the environmentally sound management of minerals and metals through [their] full lifecyle”.

Colombia hopes this will eventually lead to an agreement on the need for an international treaty to define mandatory rules and standards that would make mineral value chains more transparent and accountable.

The proposal was set out in a draft resolution submitted to the UN Environment Assembly (UNEA) earlier this week and seen by Climate Home News. UNEA, which is constituted of all UN member states, is the world’s top decision-making body for matters relating to the environment. The assembly’s seventh session will meet in Kenya in December to vote on countries’ proposals.

    Soaring demand for the minerals used to manufacture clean energy technologies and electric vehicles, as well as in the digital, construction and defence industries have led to growing environmental destruction, human rights violations and social conflict.

    Colombia argues there is an “urgent need” to strengthen global cooperation and governance to reduce the risks to people and the planet.

    Options for a global minerals agreement

    The proposal is among a flurry of initiatives to strength global mineral governance at a time when booming demand is putting pressure on new mining projects.

    Colombia, which produces emeralds, gold, platinum and silver for exports, first proposed the idea for a binding international agreement on minerals traceability and accountability on the sidelines of the UN biodiversity talks it hosted in October 2024.

    Since then, the South American nation has been quietly trying to drum up support for the idea, especially among African and European nations.

    Its draft resolution to UNEA7 contains very few details, leaving it open for countries to discuss what kind of global instrument would be best suited to make mineral supply chains more transparent and sustainable.

    Does the world need a global treaty on energy transition minerals?

    Colombia says it wants the expert group to build on other UN initiatives, including a UN Panel on Critical Energy Transition Minerals, which set out seven principles to ensure the mining, processing and recycling of energy transition minerals are done responsibly and benefit everyone.

    The group would include technical experts and representatives from international and regional conventions, major country groupings as well as relevant stakeholders.

    It would examine the feasibility and effectiveness of different options for a global agreement, consider their costs and identify measures to support countries to implement what is agreed.

    The resolution also calls for one or two meetings for member states to discuss the idea before the UNEA8 session planned in late 2027, when countries would decide on a way forward.

    No time to lose for treaty negotiations

    Colombia’s efforts to advance global talks on mineral supply chains have been welcomed by resource experts and campaigners. But not everyone agrees on the best strategy to move the discussion forward at a time when multilateralism is coming under attack.

    Johanna Sydow, a resource policy expert who heads the international environmental policy division of the Heinrich-Böll Foundation, said she had hoped that the resolution would explicitly call for negotiations to begin on an international minerals treaty.

    “Treaty negotiations take a long time. If you don’t even start with it now, it will take even longer. I don’t see how in two or three years it will be easier to come to an agreement,” she told Climate Home.

      Despite the geopolitical challenges, “we need joint rules to prevent a huge race to the bottom for [mineral] standards”. That could start with a group of countries coming together and starting to enforce joint standards for mining, processing and recycling minerals, she said.

      But any meaningful global agreement on mineral supply chains would require backing from China, the world’s largest processor of minerals, which dominates most of the supply chains. And with Colombia heading for an election in May, it will need all the support it can get to move its proposal forward.

      ‘Voluntary initiative won’t cut it’

      Juliana Peña Niño, Colombia country manager at the Natural Resource Governance Institute, is more optimistic. “Colombia’s leadership towards fairer mineral value chains is a welcome step,” she told Climate Home News.

      “At UNEA7, we need an ambitious debate that gives the proposed expert group a clear mandate to advance concrete next steps — not delay decisions — and that puts the voices of those most affected at the centre. One thing is clear: the path forward must ultimately deliver a binding instrument, as yet another voluntary initiative simply won’t cut it,” she said.

      More than 50 civil society groups spanning Latin America, Africa and Europe previously described Colombia’s work on the issue as “a chance to build a new global paradigm rooted in environmental integrity, human rights, Indigenous Peoples’ rights, justice and equity”.

      “As the energy transition and digitalisation drive demand for minerals, we cannot afford to repeat old extractive models built on asymmetry – we must redefine them,” they wrote in a statement.


      Main image: The UN Environment Assembly is hosted in Nairobi, Kenya. (Natalia Mroz/ UN Environment)

      The post Colombia proposes expert group to advance talks on minerals agreement appeared first on Climate Home News.

      Colombia proposes expert group to advance talks on minerals agreement

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      Climate Change

      California Sanctions Stark Disparities in Pesticide Exposure During Pregnancy

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      If you’re young, pregnant and Latina, chances are you live near agricultural fields sprayed with higher levels of brain-damaging organophosphate pesticides.

      A baby in the womb has few defenses against industrial petrochemicals designed to kill.

      California Sanctions Stark Disparities in Pesticide Exposure During Pregnancy

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      Climate Change

      DeBriefed 3 October 2025: UK political gap on climate widens; Fossil-fuelled Typhoon Ragasa; ‘Overshoot’ unknowns

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      Welcome to Carbon Brief’s DeBriefed.
      An essential guide to the week’s key developments relating to climate change.

      This week

      Shattered climate consensus

      FRACKING BAN: UK energy secretary Ed Miliband has announced that the government will bring forward its plans to permanently ban fracking, in a move designed to counter a promise from the hard-right Reform party to restart efforts to introduce the practice, the Guardian said. In the same speech, Miliband said Reform’s plans to scrap clean-energy projects would “betray” young people and future generations, the Press Association reported.

      ACT AXE?: Meanwhile, Kemi Badenoch, leader of the Conservatives, pledged to scrap the 2008 Climate Change Act if elected, Bloomberg reported. It noted that the legislation was passed with cross-party support and strengthened by the Conservatives.
      ‘INSANE’: Badenoch faced a backlash from senior Tory figures, including ex-prime minister Theresa May, who called her pledge a “catastrophic mistake”, said the Financial Times. The newspaper added that the Conservatives were “trailing third in opinion polls”. A wide range of climate scientists also condemned the idea, describing it as “insane”, an “insult” and a “serious regression”.

      Around the world

      • CLIMATE CRACKDOWN: The US Department of Energy has told employees in the Office of Energy Efficiency and Renewable Energy to avoid using the term “climate change”, according to the Guardian.
      • FOREST DELAY: Plans for Brazil’s COP30 flagship initiative, the tropical forests forever fund, are “suffer[ing] delays” as officials remain split on key details, Bloomberg said.
      • COP MAY BE ‘SPLIT’: Australia could “split” the hosting of the COP31 climate summit in 2026 under a potential compromise with Turkey, reported the Guardian.
      • DIVINE INTERVENTION: Pope Leo XIV has criticised those who minimise the “increasingly evident” impact of global warming in his first major climate speech, BBC News reported.

      €44.5 billion

      The  cost of extreme weather and climate change in the EU in the last four years – two-and-a-half times higher than in the decade to 2019, according to a European Environment Agency report covered by the Financial Times.


      Latest climate research

      (For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)

      Captured

      Bar chart showing that Great Britain has been fully powered by clean energy for a record 87 hours in 2025 to date

      Clean energy has met 100% of Great Britain’s electricity demand for a record 87 hours this year so far, according to new Carbon Brief analysis. This is up from just 2.5 hours in 2021 and 64.5 hours in all of 2024. The longest stretch of time where 100% of electricity demand was met by clean energy stands at 15 hours, from midnight on 25 May 2025 through to 3pm on 26 May, according to the analysis.

      Spotlight

      ‘Overshoot’ unknowns

      As the chances of limiting global warming to 1.5C dwindle, there is increasing focus on the prospects for “overshooting” the Paris Agreement target and then bringing temperatures back down by removing CO2 from the atmosphere.

      At the first-ever Overshoot Conference in Laxenburg, Austria, Carbon Brief asks experts about the key unknowns around warming “overshoot”.

      Sir Prof Jim Skea

      Chair of the Intergovernmental Panel on Climate Change (IPCC) and emeritus professor at Imperial College London’s Centre for Environmental Policy

      So there are huge knowledge gaps around overshoot and carbon dioxide removal (CDR). As it’s very clear from the themes of this conference, we don’t altogether understand how the Earth would react in taking CO2 out of the atmosphere.

      We don’t understand the nature of the irreversibilities and we don’t understand the effectiveness of CDR techniques, which might themselves be influenced by the level of global warming, plus all the equity and sustainability issues surrounding using CDR techniques.

      Prof Kristie Ebi

      Professor at the University of Washington’s Center for Health and the Global Environment

      There are all kinds of questions about adaptation and how to approach effective adaptation. At the moment, adaptation is primarily assuming a continual increase in global mean surface temperature. If there is going to be a peak – and of course, we don’t know what that peak is – then how do you start planning? Do you change your planning?

      There are places, for instance when thinking about hard infrastructure, [where overshoot] may result in a change in your plan – because as you come down the backside, maybe the need would be less. For example, when building a bridge taller. And when implementing early warning systems, how do you take into account that there will be a peak and ultimately a decline? There is almost no work in that. I would say that’s one of the critical unknowns.

      Dr James Fletcher

      Former minister for public service, sustainable development, energy, science and technology for Saint Lucia and negotiator at COP21 in Paris.

      The key unknown is where we’re going to land. At what point will we peak [temperatures] before we start going down and how long will we stay in that overshoot period? That is a scary thing. Yes, there will be overshoot, but at what point will that overshoot peak? Are we peaking at 1.6C, 1.7C, 2.1C?

      All of these are scary scenarios for small island developing states – anything above 1.5C is scary. Every fraction of a degree matters to us. Where we peak is very important and how long we stay in this overshoot period is equally important. That’s when you start getting into very serious, irreversible impacts and tipping points.

      Prof Oliver Geden

      Senior fellow and head of the climate policy and politics research cluster at the German Institute for International and Security Affairs and vice-chair of IPCC Working Group III

      [A key unknown] is whether countries are really willing to commit to net-negative trajectories. We are assuming, in science, global pathways going net-negative, with hardly any country saying they want to go there. So maybe it is just an academic thought experiment. So we don’t know yet if [overshoot] is even relevant. It is relevant in the sense that if we do, [the] 1.5C [target] stays on the table. But I think the next phase needs to be that countries – or the UNFCCC as a whole – needs to decide what they want to do.

      Prof Lavanya Rajamani

      Professor of international environmental law at the University of Oxford

      I think there are several scientific unknowns, but I would like to focus on the governance unknowns with respect to overshoot. To me, a key governance unknown is the extent to which our current legal and regulatory architecture – across levels of governance, so domestic, regional and international – will actually be responsive to the needs of an overshoot world and the consequences of actually not having regulatory and governance architectures in place to address overshoot.

      Watch, read, listen

      FUTURE GAZING: The Financial Times examined a “future where China wins the green race”.

      ‘JUNK CREDITS’: Climate Home News reported on a “forest carbon megaproject” in Zimbabwe that has allegedly “generated millions of junk credits”.
      ‘SINK OR SWIM’: An extract from a new book on how the world needs to adapt to climate change, by Dr Susannah Fisher, featured in Backchannel.

      Coming up

      Pick of the jobs

      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 3 October 2025: UK political gap on climate widens; Fossil-fuelled Typhoon Ragasa; ‘Overshoot’ unknowns appeared first on Carbon Brief.

      DeBriefed 3 October 2025: UK political gap on climate widens; Fossil-fuelled Typhoon Ragasa; ‘Overshoot’ unknowns

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