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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

US targets Chinese clean tech

100% TARIFFS: US president Joe Biden on Tuesday announced tariffs on “$18bn” in Chinese clean technologies and critical minerals, Reuters reported. According to the newswire, tariffs on Chinese electric vehicles (EVs) will quadruple to 100% (plus a separate 2.5% tariff), while solar cell tariffs will double to 50%, lithium-ion EV battery tariffs will increase from 7.5% to 25% and tariffs on critical minerals rise from nothing to 25% this year. 

SOLAR PANELS: On Friday, the Biden administration announced further tariffs on double-sided solar panel imports, which largely come from southeast Asia, the Financial Times reported. Economist Joe Brusuelas told CNN that the changes “foreshadow what is going to be a long, cold winter of economic conflict between the US and China”.

CALL AND RESPONSE: In the New York Times, economist Paul Krugman said the tariffs were all about “political economy”. He explained: “If those subsidies [under Biden’s Inflation Reduction Act] are seen as creating jobs in China instead, our last, best hope of avoiding climate catastrophe will be lost.” State-run newspaper China Daily quoted foreign ministry spokesperson Wang Wenbin saying that the US is “making double standards by justifying its own subsidies and exports, while accusing other countries’ subsidies and exports as ‘unfair’ and ‘overcapacity’”.

Afghanistan flooding

‘CATASTROPHIC’ FLOODING: Flash flooding hit Baghlan province in north Afghanistan last Friday, leaving more than 300 people dead and villages cut off, Fox Weather reported. The outlet said that the flooding washed away “vast landscapes” of communities and farms. It added that the World Health Organization described the floods as “catastrophic” and stated the country “lacks the necessary resources to manage a disaster of this magnitude”, including health facilities, especially as waterborne diseases emerge.

AID CALL: A survivor of the floods in a district of Baghlan told Xinhua that victims fled to the mountain in search of refuge and scores of them are still stranded in the hilltops. The newswire spoke to another survivor who said: “No one has assisted us, the women are living in the open ground, there is no tent and no one has provided assistance.

Around the world

  • WEAKENING UK TARGETS?: Ministers are “considering” weakening the UK’s emissions targets by carrying over the “unused” portion of the last carbon budget to the next period, the Guardian reported. A decision is due this month.
  • VATICAN CLIMATE SUMMIT: Experts and leaders from the Americas, Asia and Africa met at a Vatican summit on how to “effectively manage” climate change and boost climate resilience from 15-17 May, Vatican News reported. The summit is expected to deliver a “Planetary Climate Resilience protocol”, which will be submitted to the UN climate change body.
  • AFRICAN CLEAN COOKING: Carbon Brief covered a summit held in Paris which saw leaders pledge $2.2bn to help to achieve universal clean cooking access by 2030, examining what this could mean for climate, energy, nature and gender goals.
  • BRAZIL CLIMATE REFUGEES: Nearly 80,000 people remain in shelters in Rio Grande do Sul, following flooding in the Brazilian state, according to El País. The outlet noted that people are in a “dramatic and uncertain situation as rains persist and water rises again”.
  • ‘HISTORIC’ TREATY: Le Monde reported that Australia and Tuvalu have agreed on a “historic” treaty to welcome climate refugees from Tuvalu, an island in the South Pacific threatened by rising sea levels. The treaty will come into force by the end of the year.
  • ‘GREEN’ MINING: At a press briefing attended by Carbon Brief, Indigenous leaders called for an upcoming OECD forum on responsible mineral supply chains to consider their rights to consent on mining projects.

€48 billion

The amount spent each year by the EU on nature-harming activities, according to a new report covered by Carbon Brief.


Latest climate research

  • New research published in Nature Communications found that chronic exposure of older adults to heat is projected to double in “all warming scenarios” by mid-century, with Asia and Africa being the most affected continents.  
  • Global investors and owners, mainly from Europe, were involved in 78% of wind and 96% of solar parks in Brazil from 2000 to 2021. These parks occupy 2,148 and 102 square km, respectively, and could “exacerbate land struggles,” according to a study in Nature Sustainability.
  • A World Weather Attribution study found that the “deadly heatwaves” that hit Asia throughout April and May this year and brought temperatures above 40C, were more frequent and extreme due to climate change. 

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

Captured

Indian coal reserves by state, 2023. Captured for DeBriefed.

The administration of Indian prime minister Narendra Modi has boosted coal mining and coal power since 2014. Carbon Brief published an interactive piece analysing the impact on Indian communities and climate change, as well how this year’s general election could change things. The map above shows that India’s coal reserves are concentrated in seven south-central and eastern states, regions that have significant Indigenous populations. Indigenous peoples and local communities told Carbon Brief that they have been displaced and suffered environmental impacts as a result of coal mining projects. 

Spotlight

Intense heatwave hits Mexico

This week, Carbon Brief speaks to experts about why recent heat in Mexico was so deadly.

Mexico recently experienced a heatwave from 3 to 13 May, leaving 14 dead and driving temperatures above 40C in several states, Forbes Mexico reported. The health services in the state of San Luis Potosí, in eastern and central Mexico, reported 10 deaths from heat stroke and other similar deaths in southern and northern states. 

Milenio reported that the heatwave also killed birds, such as parrots and toucans, in San Luis Potosí. N+ news added that owls, parrots, stake birds and bats also died because of the heat, and other species, such as squirrels and turkeys, were also affected.

The heatwave is the second major deadly event in Mexico’s heat season, which began in March, Reuters reported.

Mexico is no exception. A recent report by the World Meteorological Organization stated that 2023 was the hottest year in Latin America and the Caribbean, with temperatures 1.39C above the 1961-1990 period.

There were 3,405 heatwave-associated deaths annually in the region between 1990 and 2019, according to a new study published in PLOS Medicine

Deadly impacts

Dr Lucía Gabriela Rosales, director of public health at the Health Services of San Luis Potosí, told Carbon Brief that this second heatwave was very “atypical” and caused four confirmed deaths from heat stroke – mostly in adults over the age of 60 – as well as cases of dehydration and heat stroke.

Rosales pointed out that there was no specific alert for this heatwave, but there was a warning about the heat season from the Civil Protection authorities.

She added that the health sector has carried out some actions to deal with the high temperatures in the state, such as community campaigns and hydration points. She called on the population to take care of their health.

Farmers affected by drought in February this year, next to Zumpango Lagoon, Mexico. Image ID: 2WKXX9R.
Farmers affected by drought in February this year, next to Zumpango Lagoon, Mexico. Credit: Imago / Alamy Stock Photo.

Dr José Antonio Ávalos, head of the Laboratory of Climate Variability, Remote Sensing and Assessment of Risks at the Autonomous University of San Luis Potosí, told Carbon Brief that May is the hottest month of the year in the state. Since 2023, the country as a whole has been experiencing levels of drought not seen since 1941, he added.

Ávalos pointed out that the authorities were aware of the municipalities most at risk from heatwaves, yet failed to effectively alert the population. He recommended the creation of a heatwave surveillance mechanism, the implementation of heat indices and increased investment in climate science.

The experts explained that heat stroke causes, among other things, body temperature above 42C, headache and tachycardia. Deaths from heat stroke are caused by an increase in the atmospheric temperature and humidity, which prevents the body’s sweat from evaporating, causing it to accumulate heat, they added.

Watch, read, listen

THREATENED PARKS: An Agence France-Presse video looked at how climate change is threatening many features of US national parks.

CHOCOLATE DILEMMA: A National Public Radio podcast explored how climate change is decreasing cocoa production worldwide and what solutions are available.

STELLAR CHANGE: The New York Times covered the challenges climate change poses to astronomers, who are considering “using their expertise” to address it.

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 17 May 2024: Biden’s clean-energy tariff blitz; Modi’s coal plans examined; Deadly heat in Mexico appeared first on Carbon Brief.

DeBriefed 17 May 2024: Biden’s clean-energy tariff blitz; Modi’s coal plans examined; Deadly heat in Mexico

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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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