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火山喷发对科学家及其气候模型构成了根本性挑战。

众所周知,剧烈的火山喷发会导致地表气温突然下降,多次喷发则会在几十年乃至几个世纪的时间尺度上影响气候变率。

当火山喷发将二氧化硫注入平流层时,会形成气溶胶,从而阻挡阳光到达地球表面。

与人类对气候变化的影响不同,后者发生缓慢且可以在各种社会经济情景下被纳入气候模型进行考量。火山喷发具有突发性,这给气候预测带来了挑战。

目前科学家尚无法预测火山喷发的发生时间、地点以及二氧化硫的排放量。

那么,在进行未来气候预测时,如何考虑火山喷发对气候的影响呢?

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在我们最近发表于《通讯-地球与环境》(Communications Earth & Environment)的研究中,我们表明火山喷发对全球气温预测的不确定性产生了重大影响。

我们的研究结果发现,如果将偶发的火山喷发纳入气候预测,突破《巴黎协定》所设定的1.5C升温上限的时间会略有延迟,但与此同时,未来几十年也将出现更多快速升温和降温的时期。

气候预测中的火山强迫

气候科学家将火山喷发对气候的影响——主要是通过释放出二氧化硫气体进入大气——称为“火山强迫”(volcanic forcing)。

当前的气候模型在进行未来预测时采用一个恒定的火山强迫值,该值是根据1850年至今的历史平均强迫值计算得出的。

国际耦合模式比较计划(CMIP)也是如此,这项全球模型工作为政府间气候变化专门委员会(IPCC)发布的重要评估报告提供基础数据。

然而,这种方法存在显著局限。

首先,历史平均强迫值无法表示火山爆发的偶发性。

大规模火山喷发呈零星分布——有时好多事件集中发生在某几个十年内,有时两个事件之间则可能相隔上百年。

此外,与数千年尺度的记录相比,从1850年至今的参考时期中,发生过的大规模喷发事件 ——指排放超过3太克(Tg)二氧化硫的喷发事件——相对较少。

最后,早期国际耦合模式比较计划气候模型中所使用的火山强迫重建数据并未包含排放量少于3太克二氧化硫的中小规模喷发。

这是因为这些喷发在1980年卫星时代开始之前大多未被探测到。然而,这些体量较小但发生频率更高的喷发事件,在长期火山强迫中贡献了30%至50%。

采取新方法

传统上,气候科学家认为气候预测中主要存在三种不确定性来源:内部变率、模型不确定性和情景不确定性。

其中,“内部”变率是指气候系统内部自然产生的波动,如厄尔尼诺现象;模型不确定性是指不同气候模型之间结果的差异;情景不确定性则涉及未来几十年全球可能的发展路径。

我们的研究结果表明,火山喷发应被明确视为气候预测中第四个重要的不确定性来源。

为了探究在考虑火山强迫不确定性的情况下,气候预测会发生怎样的变化,我们的研究采用了一种概率方法,这一方法建立在Bethke等人于2017年提出的研究基础之上。

为此,我们构建了“随机强迫情景”,其本质是1000种延续至本世纪末的火山活动可能时间线预测。

这些情景基于冰芯中记录的过去1.15万年火山活动历史,以及卫星观测和地质证据。每个情景都呈现了不同的喷发强度、地点、时间和频率的组合。

(在数学中,“随机”系统是指结果包含随机性或不确定性的系统,因此不可预测;这与“确定性”系统相对,后者的结果可以通过初始条件和一套规则或方程完全预测。)

随后,我们利用2015至2100年期间的随机火上强迫和历史平均火山强迫模拟气候预测,研究共享社会经济路径(SSPs)中三种不同排放情景下的升温变化:低排放情景(SSP1-1.9)、与现行气候政策相符的中等排放情景(SSP2-4.5)、非常高排放情景(SSP5-8.5)。

在这一步中,我们使用了一种称为FaIR的简化气候模型,也称“模拟器”。

通过模拟1000种不同的火山未来情况,我们发现在21世纪未来时期火山喷发所引起的气候不确定性,可能超过同期气候系统本身的内部变率。

我们还发现,到2030年代,火山喷发可能占全球气温预测总不确定性的三分之一以上。

下图中能看到这些结果。图中展示了不同来源对总不确定性的影响。火山为橙色、内部变率为深蓝色、气候模型响应为黄色,未来人类排放情景为绿色。

Chart: Annual mean contribution of uncertainties

对1.5C临界值的意义

我们的模拟结果表明,在气候预测中纳入可能的火山活动时间线后,短期内突破《巴黎协定》设定的1.5C升温上限的概率略有下降。

根据不同的排放情景,相较于使用恒定火山强迫的预测,模拟发现超过1.5C升温上限的概率下降了4%至10%。

尽管这一结果听起来似乎令人鼓舞,但未来的火山活动并不能在长期缓和由人类引起的全球变暖。

1815年坦博拉火山的喷发事件就是一个强有力的例证。这次喷发使全球气温平均下降了约0.8C,带来了“无夏之年”,导致欧洲、北美和中国大范围的作物歉收和饥荒。

火山喷发带来的降温效应是短暂的,通常只持续几年,其并不会改变由人类排放所导致的长期变暖趋势。

我们的研究发现,即使考虑多种可能的未来火山活动,在除了最低排放路径以外的所有情景中,全球变暖仍将在几十年内超过1.5C。

即便21世纪火山活动频繁,其对全球变暖的抵消作用也仅占很小一部分——这意味着减排对于实现长期气候目标仍然至关重要。

下方图表展示了在三种排放情景下,使用随机火山强迫(实线)与恒定火山强迫(虚线)时超过1.5C的概率(上图),以及两种强迫方式之间的概率差异(下图)。

Charts: Probability of exceeding 1.5C

十年尺度的气温变率

我们的研究提供的另一个重要发现是:一旦将火山强迫的变率纳入考虑,将更有可能出现极端温暖和寒冷的十年期。

在中等排放情景下,我们发现出现负向十年期趋势——即全球表面温度在某个十年内平均下降——的概率增加了10%到18%。

与此同时,出现极端温暖十年期的概率也随之增加,这反映出火山强迫的变率会同时提高变暖和变冷极端事件发生的可能性。

这一结果凸显了火山喷发如何在十年时间尺度上对全球气温趋势带来显著的波动。

迈向更完善的气候预测

了解火山对气候的影响,对于全面评估农业、基础设施和能源系统在未来所面临的风险至关重要。

使用全面的地球系统模型运行数千种火山情景并不切实际,因为这需要极高的计算资源。但与此同时,当前的方法也存在上文提到的显著局限。

不过,在未来的气候模型工作中,仍有折中方案可行。

即将开展的下一阶段气候建模实验——即CMIP7情景模式比较计划——可以采用更具代表性的“平均”火山强迫基线,这一基线纳入了历史记录中常被遗漏的小型喷发事件的影响。这一偏差现已在用于下一代气候模型模拟的历史火山强迫数据集中得到纠正。

此外,建模团队还应额外运行包含高频和低频未来火山活动的情景,以全面捕捉火山不确定性对气候预测的影响范围。

虽然人类导致的温室气体排放仍是气候变化的主导因素,但若能妥善考虑火山活动的不确定性,将有助于我们获得更全面的未来气候图景及其对社会的潜在影响。

The post 嘉宾来稿:探究火山喷发如何影响气候预测 appeared first on Carbon Brief.

嘉宾来稿:探究火山喷发如何影响气候预测

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DeBriefed 28 November 2025: COP30’s ‘frustrating’ end; Asia floods; UK ‘emergency’ climate event

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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

‘Lukewarm’ end to COP30

BYE BELÉM: The COP30 climate talks in Belém ended last weekend with countries agreeing on a goal to “triple” adaptation finance by 2035 and efforts to “strengthen” climate plans, Climate Home News reported. The final deal “fell short on the global transition away from oil, gas and coal”, the outlet said, as Brazil announced that it would bring forward voluntary roadmaps to phase out fossil fuels and deforestation, before the next COP. It was a “frustrating end” for more than 80 countries who wanted a roadmap away from fossil fuels to be part of the formal COP agreement, BBC News said.

WHAT HAPPENED?: Carbon Brief published its in-depth analysis of all the key outcomes from COP30, spanning everything from negotiations on adaptation, just transition, gender and “Article 6” carbon trading through to a round-up of pledges on various issues. Another Carbon Brief article summed up outcomes around food, forests, land and nature. Also, Carbon Brief journalists discussed the COP in a webinar held earlier this week.

ART OF THE DEAL: The “compromise” COP30 deal – known as the “global mutirão” – “exposed deep rifts over how future climate action should be pursued”, Reuters noted. The “last-ditch” agreement was reached after fossil-fuel wording negotiations between the EU and Saudi Arabia, according to the Guardian. Meanwhile, Carbon Brief revealed the “informal” list of 84 countries said to have “opposed” the inclusion of a fossil-fuel roadmap in the mutirão decision, but analysis of the list exposed contradictions and likely errors.

UNITY, SCIENCE, SENSE: The final agreement received “lukewarm praise”, said the Associated Press. Palau ambassador Ilana Seid, who chaired the coalition of small-island nations, told the newswire: “Given the circumstances of geopolitics today, we’re actually quite pleased…The alternative is that we don’t get a decision and that would have been [worse].” UN climate chief Simon Stiell said that amid “denial, division and geopolitics”, countries “chose unity, science and economic common sense”, reported the Press Trust of India.

Around the world

  • Floods and landslides killed more than 200 people in Thailand and Indonesia this week, reported Bloomberg. At least 90 people also died in recent floods in Vietnam, said Al Jazeera.
  • New measures to cut energy bills and a “pay-per-mile” electric-vehicle levy were among the announcements in the UK’s budget, said Carbon Brief.
  • The Group of 20 (G20) leaders signed off on a declaration “addressing the climate crisis” and other issues, reported Reuters, which had no input from the US who boycotted last week’s G20 summit in South Africa.
  • Canadian prime minister Mark Carney signed a deal with the province of Alberta “centred on plans for a new heavy oil pipeline”, said the Guardian, adding that Canadian culture minister and former environment minister, Steven Guilbeault, resigned from cabinet over the deal.
  • Greenpeace analysis, covered by Reuters, found that permits for new coal plants in China are “on track to fall to a four-year low” in 2025.

27

The number of hours that COP30 talks went over schedule before ending in Belém last Saturday, making it the 11th-longest UN climate summit on record, according to analysis by Carbon Brief.


Latest climate research

  • The risk of night-time deaths during heatwaves increased “significantly” over 2005-15 in sub-Saharan Africa | Science Advances
  • Almost half of climate journalists surveyed showed “moderate to severe” symptoms of anxiety | Traumatology
  • Lakes experienced “more severe” heatwaves than those in the atmosphere over the past two decades | Communications Earth & Environment

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

Captured

COP30: The 'global mutirao' text does not use many active verbs

The key COP30 agreement – termed the “global mutirão” – contained 69 inactive verbs, which require no action from countries, compared to 32 active ones. “Recognises”, “recalls” and “acknowledges” were used far more often than more active verbs, such as “decides”, “calls” and “requests”, showed Carbon Brief analysis.

Spotlight

Nine warnings from a UK climate and nature ‘emergency’ briefing

This week, Carbon Brief’s Orla Dwyer reports from an event where experts and campaigners sounded the alarm bell on climate change and nature loss.

Naturalist and broadcaster Chris Packham urged attendees at a climate and nature “emergency briefing” in London yesterday to “listen to the science” on climate change amid a “dangerous wave of misinformation and lies”.

The “first-of-its-kind” event heard from nine experts on the links between climate change, nature loss, health, food production, economics and national security.

Event host, Prof Mike Berners-Lee from Lancaster University, called for a “World War II level of leadership” to tackle the interconnected crises.

Hundreds of people showed up, including Green Party, Labour and Liberal Democrat MPs, leader of the Greens Zack Polanski, musician Brian Eno and actress Olivia Williams.

Here is a snapshot of what the nine speakers said in their short, but stark, presentations.

Prof Kevin Anderson, professor of energy at University of Manchester

Anderson focused on the risks of a warmer world and the sliver of emissions left in the global carbon budget, noting:

“We have to eliminate fossil fuels or temperatures will just keep going up.”

He urged a “Marshall-style” plan – referencing the 1948 post-war US plan to rebuild Europe – to ramp up actions on retrofitting, public transport and electrification.

Prof Nathalie Seddon, professor of biodiversity at University of Oxford

Nature is not a “nice to have”, but rather “critical national infrastructure”, Seddon told attendees. She called for the “need to create an economy that values nature”.

Prof Paul Behrens, British Academy global professor at University of Oxford

Behrens discussed the food security risks from climate change. Impacts such as poor harvests and food price inflation are “barely acknowledge[d]” in agricultural policy, he said.

He also emphasised the “unsustainable” land use of animal agriculture, which “occupies around 85% of total agricultural land” in the UK.

Prof Tim Lenton, chair in climate change and Earth system science at Exeter University

Lenton outlined the “plenty” of evidence that parts of the Earth system are hurtling towards climate tipping points that could push them irreversibly into a new state.

He discussed the possibility of the shutdown of the Atlantic Meridional Overturning Circulation, which he said could cause -20C winters in London. He also noted positive tipping points, such as momentum that led the UK to stop burning coal for electricity last year.

Speakers taking audience questions during the “national emergency briefing” event in London on 27 November. Credit: ZUMA Press, Inc.
Speakers taking audience questions during the “national emergency briefing” event in London on 27 November. Credit: ZUMA Press, Inc. / Alamy Stock Photo

Prof Hayley Fowler, professor of climate change impacts at Newcastle University

One in four properties in England could be at risk of flooding by 2050, Fowler said, and winters are getting wetter.

She discussed extreme weather risks and listed the impacts of floods in recent years in Germany, Spain and Libya, adding:

“These events are not warnings of what might happen in the future. They’re actually examples of what is happening right now.”

Angela Francis, director of policy solutions at WWF-UK

Francis factchecked several claims made against climate action, such as the high cost of achieving net-zero.

She noted that the estimated cost for the UK to achieve net-zero is about £4bn per year, which is less than 0.2% of GDP.

Lieutenant general Richard Nugee, climate and security advisor

Discussing the risks climate change poses to national security, Nugee said:

“Climate change can be thought of as a threat multiplier, making existing threats worse or more frequent and introducing new threats. Climate shocks fuel global instability.”

Tessa Khan, environmental lawyer and executive director of Uplift

Khan said the rising cost of energy in the UK is “turning into a significant political risk for the energy transition”.

She discussed the cost of fossil-fuel dependency and the fact that these fuels cost money to burn, but renewable “input[s], sun or wind [are] free forever”.

Prof Hugh Montgomery, professor of intensive care medicine at University College London

Montgomery discussed the health and economic benefits of climate actions, such as eating less meat and using more public transport, noting:

“The climate emergency is a health emergency – and it’s about time we started treating it as one.”

Watch, read, listen

WATER WORRIES: ABC News spoke to three Iranian women about the impacts of Tehran’s water crisis amid the “worst drought in 60 years”.

CLIMATE EFFORT: The BBC’s Climate Question podcast looked at the main outcomes from COP30 and discussed the “future of climate action” with a team of panelists.

CRIMINAL BEHAVIOUR:New Scientist interviewed criminal psychologist Julia Shaw about the psychology behind environmental crimes.

Coming up

Pick of the jobs

DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.

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The post DeBriefed 28 November 2025: COP30’s ‘frustrating’ end; Asia floods; UK ‘emergency’ climate event appeared first on Carbon Brief.

DeBriefed 28 November 2025: COP30’s ‘frustrating’ end; Asia floods; UK ‘emergency’ climate event

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Revealed: Leak casts doubt on COP30’s ‘informal list’ of fossil-fuel roadmap opponents

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A confused – and, at times, contradictory – story has emerged about precisely which countries and negotiating blocs were opposed to a much-discussed “roadmap” deal at COP30 on “transitioning away from fossil fuels”.

Carbon Brief has obtained a leaked copy of the 84-strong “informal list” of countries that, as a group, were characterised across multiple media reports as “blocking” the roadmap’s inclusion in the final “mutirão” deal across the second week of negotiations at the UN climate summit in Belém.

During the fraught closing hours of the summit, Carbon Brief understands that the Brazilian presidency told negotiators in a closed meeting that there was no prospect of reaching consensus on the roadmap’s inclusion, because there were “80 for and 80 against”.

However, Carbon Brief’s analysis of the list – which was drawn up informally by the presidency – shows that it contains a variety of contradictions and likely errors.

Among the issues identified by Carbon Brief is the fact that 14 countries are listed as both supporting and opposing the idea of including a fossil-fuel roadmap in the COP30 outcome.

In addition, the list of those said to have opposed a roadmap includes all 42 of the members of a negotiating group present in Belém – the least-developed countries (LDCs) – that has explicitly told Carbon Brief it did not oppose the idea.

Moreover, one particularly notable entry on the list, Turkey – which is co-president of COP31 – tells Carbon Brief that its inclusion is “wrong”.

Negotiating blocs

COP28, held in Dubai in 2023, had finalised the first “global stocktake”, which called on all countries to contribute to global efforts, including a “transition away from fossil fuels”.

Since then, negotiations on how to take this forward have faltered, including at COP29 in Baku, Azerbaijan, where countries were unable to agree to include this fossil-fuel transition as part of existing or new processes under the UN climate regime.

Ahead of the start of COP30, Brazilian president Luiz Inácio Lula da Silva made a surprise call for “roadmaps” on fossil-fuel transition and deforestation.

While this idea was not on the official agenda for COP30, it had been under development for months ahead of the summit – and it became a key point of discussion in Belém.

Ultimately, however, it did not become part of the formal COP30 outcome, with the Brazilian presidency instead launching a process to draw up roadmaps under its own initiative.

This is because the COP makes decisions by consensus. The COP30 presidency insisted that there was no prospect of consensus being reached on a fossil-fuel roadmap, telling closed-door negotiations that there were “80 for and 80 against”.

The list of countries supporting a roadmap as part of the COP30 outcome was obtained by Carbon Brief during the talks. Until now, however, the list of those opposed to the idea had not been revealed.

Carbon Brief understands that this second list was drawn up informally by the Brazilian presidency after a meeting attended by representatives of around 50 nations. It was then filled out to the final total of 84 countries, based on membership of negotiating alliances.

The bulk of the list of countries opposing a roadmap – some 39 nations – is made up of two negotiating blocs that opposed the proposal for divergent reasons (see below). Some countries within these blocs also held different positions on why – or even whether – they opposed the roadmap being included in the COP30 deal.

These blocs are the 22-strong Arab group – chaired in Belém by Saudi Arabia – and the 25 members of the “like-minded developing countries” (LMDCs), chaired by India.

For decades within the UN climate negotiations, countries have sat within at least one negotiating bloc rather than act in isolation. At COP30, the UN says there were 16 “active groups”. (Since its invasion of Ukraine, Russia has not sat within any group.)

The inclusion on the “informal list” (shown in full below) of both the LMDCs and Arab group is accurate, as confirmed by the reporting of the International Institute for Sustainable Development’s Earth Negotiations Bulletin (ENB), which is the only organisation authorised to summarise what has happened in UN negotiations that are otherwise closed to the media.

Throughout the fortnight of the talks, both the LMDCs and Arab group were consistent – at times together – in their resistance to proscriptive wording and commitments within any part of the COP30 deal around transitioning away from fossil fuels.

But the reasons provided were nuanced and varied and cannot be characterised as meaning both blocs simply did not wish to undertake the transition – in fact, all countries under the Paris Agreement had already agreed to this in Dubai two years ago at COP28.

However, further analysis by Carbon Brief of the list shows that it also – mistakenly – includes all of the members of the LDCs, bar Afghanistan and Myanmar, which were not present at the talks. In total, the LDCs represented 42 nations in Belém, ranging from Bangladesh and Benin through to Tuvalu and Tanzania.

Some of the LDC nations had publicly backed a fossil-fuel roadmap.

‘Not correct’

Manjeet Dhakal, lead adviser to the LDC chair, tells Carbon Brief that it is “not correct” that the LDCs, as a bloc, opposed a fossil-fuel roadmap during the COP30 negotiations.

He says that the group’s expectations, made public before COP, clearly identified transitioning away from fossil fuels as an “urgent action” to keep the Paris Agreement’s 1.5C goal “within reach”. He adds:

“The LDC group has never blocked a fossil-fuel roadmap. [In fact], a few LDCs, including Nepal, have supported the idea.”

Dhakal’s statement highlights a further confusing feature of the informal list – 14 countries appear on both of the lists of supporters and opposers. This is possible because many countries sit within two or more negotiating blocs at UN climate talks.

For example, Kiribati, Solomon Islands and Tuvalu are members of both the “alliance of small island states” (AOSIS) and the LDCs.

As is the case with the “informal list” of opposers, the list of supporters (which was obtained by Carbon Brief during the talks) is primarily made up of negotiating alliances.

Specifically, it includes AOSIS, the “environmental integrity group” (EIG), the “independent association of Latin America and the Caribbean” (AILAC) and the European Union (EU).

In alphabetical order, the 14 countries on both lists are: Bahrain; Bulgaria; Comoros; Cuba; Czech Republic; Guinea-Bissau; Haiti; Hungary; Kiribati; Nepal; Sierra Leone; Solomon Islands; Timor-Leste; and Tuvalu.

This obvious anomaly acts to highlight the mistaken inclusion of the LDCs on the informal list of opposers.

The list includes 37 of the 54 nations within the Africa group, which was chaired by Tanzania in Belém.

But this also appears to be a function of the mistaken inclusion of the LDCs in the list, many of which sit within both blocs.

Confusion

An overview of the talks published by the Guardian this week reported:

“Though [Brazil’s COP30 president André Corrêa do Lago] told the Guardian [on 19 November] that the divide over the [roadmap] issue could be bridged, [he] kept insisting 80 countries were against the plan, though these figures were never substantiated. One negotiator told the Guardian: ‘We don’t understand where that number comes from.’

“A clue came when Richard Muyungi, the Tanzanian climate envoy who chairs the African group, told a closed meeting that all its 54 members aligned with the 22-member Arab Group on the issue. But several African countries told the Guardian this was not true and that they supported the phaseout – and Tanzania has a deal with Saudi Arabia to exploit its gas reserves.”

Adding to the confusion, the Guardian also said two of the most powerful members of the LMDCs were not opposed to a roadmap, reporting: “China, having demurred on the issue, indicated it would not stand in the way [of a roadmap]; India also did not object.”

Writing for Climate Home News, ActionAid USA’s Brandon Wu said:

“Between rich country intransigence and undemocratic processes, it’s understandable – and justifiable – that many developing countries, including most of the Africa group, are uncomfortable with the fossil-fuel roadmap being pushed for at COP30. It doesn’t mean they are all ‘blockers’ or want the world to burn, and characterising them as such is irresponsible.

“The core package of just transition, public finance – including for adaptation and loss and damage – and phasing out fossil fuels and deforestation is exactly that: a package. The latter simply will not happen, politically or practically, without the former.”

Carbon Brief understands that Nigeria was a vocal opponent of the roadmap’s inclusion in the mutirão deal during the final hours of the closed-door negotiations, but that does not equate to it opposing a transition away from fossil fuels. This is substantiated by the ENB summary:

“During the…closing plenary…Nigeria stressed that the transition away from fossil fuels should be conducted in a nationally determined way, respecting [common, but differentiated responsibilities and respective capabilities].”

The “informal list” of opposers also includes three EU members – Bulgaria, the Czech Republic and Hungary.

The EU – led politically at the talks by climate commissioner Wopke Hoekstra, but formally chaired by Denmark – was reportedly at the heart of efforts to land a deal that explicitly included a “roadmap” for transitioning away from fossil fuels.

Carbon Brief understands that, as part of the “informal intelligence gathering” used to compile the list, pre-existing positions on climate actions by nations were factored in rather than only counting positions expressed at Belém. For example, Hungary and the Czech Republic were reported to have been among those resisting the last-minute “hard-fought deal” by the EU on its 2040 climate target and latest Paris Agreement climate pledge.

(Note that EU members Poland and Italy did not join the list of countries supporting a fossil-fuel roadmap at COP30.)

The remaining individual nations on the informal list either have economies that are heavily dependent on fossil-fuel production (for example, Russia and Brunei Darussalam), or are, like the US, currently led by right-leaning governments resistant to climate action (for example, Argentina).

Turkey is a notable inclusion on the list because it was agreed in Belém that it will host next year’s COP31 in Antalya, but with Australia leading the negotiation process. In contrast, Australia is on the 85-strong list of roadmap supporters.

However, a spokesperson for Turkey’s delegation in Belem has told Carbon Brief that it did not oppose the roadmap at COP30 and its inclusion on the list is “wrong”.

Saudi negotiators in conversation with COP30 president André Corrêa do Lago. Do Lago is on the left with his eyebrows raised, and 9 negotiators can be seen gathered around him, all people forming a circle.
Saudi negotiators in conversation with COP30 president André Corrêa do Lago. Credit: IISD/ENB | Mike Muzurakis.

Media characterisations

Some media reporting of the roadmap “blockers” sought to identify the key proponents.

For example, the Sunday Times said “the ‘axis of obstruction’ – Saudi Arabia, Russia and China – blocked the Belém roadmap”.

Agence France-Presse highlighted the views of a French minister who said: “Who are the biggest blockers? We all know them. They are the oil-producing countries, of course. Russia, India, Saudi Arabia. But they are joined by many emerging countries.”

Reuters quoted Vanuatu’s climate minister alleging that “Saudi Arabia was one of those opposed”.

The Financial Times said “a final agreement [was] blocked again and again by countries led by Saudi Arabia and Russia”.

Bloomberg said the roadmap faced “stiff opposition from Arab states and Russia”.

Media coverage in India and China has pushed back at the widespread portrayals of what many other outlets had described as the “blockers” of a fossil-fuel roadmap.

The Indian Express reported:

“India said it was not opposed to the mention of a fossil-fuel phaseout plan in the package, but it must be ensured that countries are not called to adhere to a uniform pathway for it.”

Separately, speaking on behalf of the LMDCs during the closing plenary at COP30, India had said: “Adaptation is a priority. Our regime is not mitigation centric.”

China Daily, a state-run newspaper that often reflects the government’s official policy positions, published a comment article this week stating:

“Over 80 countries insisted that the final deal must include a concrete plan to act on the previous commitment to move beyond coal, oil, and natural gas adopted at COP28…But many delegates from the global south disagreed, citing concerns about likely sudden economic contraction and heightened social instability. The summit thus ended without any agreement on this roadmap.

“Now that the conference is over, and emotions are no longer running high, all parties should look objectively at the potential solution proposed by China, which some international media outlets wrongly painted as an opponent to the roadmap.

“Addressing an event on the sidelines of the summit, Xia Yingxian, deputy head of China’s delegation to COP30, said the narrative on transitioning away from fossil fuels would find greater acceptance if it were framed differently, focusing more on the adoption of renewable energy sources.”

Speaking to Carbon Brief at COP30, Dr Osama Faqeeha, Saudi Arabia’s deputy environment minister, refused to be drawn on whether a fossil-fuel roadmap was a red line for his nation, but said:

“I think the issue is the emissions, it’s not the fuel. And our position is that we have to cut emissions regardless.”

Neither the Arab group nor the LMDCs responded to Carbon Brief’s invitation to comment on their inclusion on the list.

The Brazilian COP30 presidency did not respond at the time of publication.

While the fossil-fuel roadmap was not part of the formal COP30 outcome, the Brazilian presidency announced in the closing plenary that it would take the idea forward under its own initiative, drawing on an international conference hosted by Colombia next year.

Corrêa do Lago told the closing plenary:

“We know some of you had greater ambitions for some of the issues at hand…As president Lula said at the opening of this COP, we need roadmaps so that humanity, in a just and planned manner, can overcome its dependence on fossil fuels, halt and reverse deforestation and mobilise resources for these purposes.

“I, as president of COP30, will therefore create two roadmaps, one on halting and reverting deforestation, another to transitioning away from fossil fuels in a just, orderly and equitable manner. They will be led by science and they will be inclusive with the spirit of the mutirão.

“We will convene high level dialogues, gathering key international organisations, governments from both producing and consuming countries, industry workers, scholars, civil society and will report back to the COP. We will also benefit from the first international conference for the phase-out of fossil fuels, scheduled to take place in April in Colombia.”

Fossil-fuel roadmap

‘Supporters’

Antigua and Barbuda
Australia
Austria
Bahamas
Barbados
Belgium
Belize
Brazil
Cabo Verde
Chile
Colombia
Cook Islands
Costa Rica
Croatia
Cyprus
Denmark
Dominica
Dominican Republic
Estonia
Fiji
Finland
France
Georgia
Germany
Greece
Grenada
Guatemala
Guyana
Honduras
Iceland
Ireland
Jamaica
Kenya
Latvia
Liechtenstein
Lithuania
Luxembourg
Maldives
Malta
Marshall Islands
Mauritius
Mexico
Micronesia
Monaco
Mongolia
Nauru
Netherlands
Niue
Norway
Palau
Panama
Papua New Guinea
Peru
Portugal
Romania
Samoa
São Tomé and Príncipe
Slovakia
Slovenia
South Korea
Spain
St. Kitts and Nevis
St. Lucia
St. Vincent and the Grenadines
Suriname
Sweden
Switzerland
Tonga
Trinidad and Tobago
UK
Vanuatu

Both ‘supporter’ and ‘opposer’

Bahrain
Bulgaria
Comoros
Cuba
Czech Republic
Guinea-Bissau
Haiti
Hungary
Kiribati
Nepal
Sierra Leone
Solomon Islands
Timor-Leste
Tuvalu

‘Opposers’

Algeria
Angola
Argentina
Armenia
Bangladesh
Benin
Bolivia
Brunei
Burkina Faso
Burundi
Cambodia
Central African Republic
Chad
China
Democratic Republic of the Congo
Djibouti
Ecuador
Egypt
El Salvador
Eritrea
Ethiopia
Gambia
Guinea
India
Indonesia
Iran
Iraq
Jordan
Kuwait
Laos
Lebanon
Lesotho
Liberia
Libya
Madagascar
Malawi
Malaysia
Mali
Mauritania
Moldova
Morocco
Mozambique
Nicaragua
Niger
Nigeria
Oman
Pakistan
Palestine
Paraguay
Philippines
Qatar
Russia
Rwanda
Saudi Arabia
Senegal
Somalia
South Sudan
Sri Lanka
Sudan
Syria
Tanzania
Togo
Tunisia
Turkey
Uganda
United Arab Emirates
Venezuela
Vietnam
Yemen
Zambia

Additional reporting by Daisy Dunne.

The post Revealed: Leak casts doubt on COP30’s ‘informal list’ of fossil-fuel roadmap opponents appeared first on Carbon Brief.

Revealed: Leak casts doubt on COP30’s ‘informal list’ of fossil-fuel roadmap opponents

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China Briefing 27 November 2025: COP30 wraps; Climate and critical minerals at G20; Coal use up

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Welcome to Carbon Brief’s China Briefing.

China Briefing handpicks and explains the most important climate and energy stories from China over the past fortnight. Subscribe for free here.

Key developments

China called for ‘strengthened’ climate cooperation

‘URGENT ACTION’: As the COP30 climate talks in Brazil drew to a close (see today’s spotlight below), world leaders gathered in South Africa for the G20 summit, where China’s premier Li Qiang urged countries to “strengthen ecological and environmental cooperation”, “take urgent action” on climate issues and “accelerate” implementation of COP30’s outcomes, state news agency Xinhua said. The Hong Kong-based South China Morning Post said that, due to the US being a “no-show”, “China and its allies drove the consensus” leading to the final G20 leaders’ declaration, adding that it “delivered major wins for African countries on debt, climate and critical minerals processing”.

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MINERALS REGIMES: The G20 declaration included a call to ensure critical mineral value-chain resilience, highlighting “geopolitical tensions, unilateral trade measures inconsistent with [World Trade Organization] rules, pandemics or natural disasters” as potential risks, Bloomberg reported, in a “seemingly veiled reference to China’s sweeping export curbs”. Bloomberg also quoted Li defending China’s need to “cautiously manage” critical-mineral exports for military use, adding that China launched a “green mining initiative with 19 nations” at the summit.

MINING TIES: Meanwhile, China and South Africa agreed an “initiative for supporting Africa’s modernisation” pledging to “assist Africa in achieving a fair, just, open and inclusive green and low-carbon transition”, according to the Communist party-affiliated People’s Daily. The text also “encourages countries to strengthen international cooperation on green infrastructure and green mining”, including in “building responsible, transparent, stable and resilient critical mineral value chains”. Reuters said that, in a meeting between the Chinese and German government, Li “pitched stronger ties” in the face of tensions over rare-earth minerals. The UK has “rolled out a critical minerals strategy designed to reduce dependence on foreign suppliers by 2035”, Reuters also reported.

‘SPECIAL’ CONNECTION: Li highlighted China and Russia’s “special, strategic” cooperation in the “oil, gas, coal and nuclear sectors” in talks with Russia’s prime minister, Reuters said. However, at a meeting of the Shanghai Cooperation Organisation in Moscow, Li said governments “should work together to advance green and low-carbon transformation”, the People’s Daily reported. Executive vice-premier Ding Xuexiang also said at the China-Russia energy business forum that the two countries should “deepen cooperation on energy transition”, the People’s Daily also said. Russian oil and gas giant Gazprom is “pushing ahead with plans” for the Power of Siberia 2 pipeline, according to the Financial Times, which added that Chinese officials have yet to confirm the project.

Coal covered October’s power surge 

COAL BACKUP: A heatwave in southern China in October caused a surge in power demand, with “coal-power plants picking up the slack amid slow growth in renewables”, Bloomberg reported. This could “make it difficult” for the country to see a plateau or reduction in carbon emissions this year, it added. David Fishman, principal at the consultancy Lantau Group, theorised on Twitter that this could have been due to the rigidity of China’s power-purchasing mechanisms, availability of coal power on spot markets and poor wind-power generation in October.

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SLOWING APPROVALS: China’s permitting for new coal-fired power units is on track to hit its lowest level since 2021, according to new research from Greenpeace East Asia. Around 42 gigawatts (GW) of new capacity was permitted in the first three quarters of 2025, it said, noting that the amount of new coal power approved between 2021-2025 was still “more than twice the total permitted” between 2016-2020. Separately, Swiss bank UBS estimated that power demand in China will grow 8% between 2028 and 2030, said finance outlet Yicai.

RENEWABLES RISE: Meanwhile, 13GW of new solar capacity was added in October, as well as 9GW of wind and 8GW of thermal power, reported Bloomberg. According to energy news outlet BJX News, from January to October 2025, China added 253GW of solar, 70GW of wind and 65GW of thermal power, mostly coal.

Managing industry emissions

MARKETS EXPAND: China has approved plans to expand its national carbon market “via a test system” some time this year, reported Bloomberg, effectively confirming that steel, aluminum and cement will be covered in the mechanism by the end of 2025. The government has also released its third batch of methodologies for its voluntary carbon market, all of which are projects related to the country’s oil and gas sector, according to energy news outlet China Energy Net.

SUPER-POLLUTANT PLAN: Separately, the government issued two plans restricting the manufacturing of products using the potent greenhouse gases known as hydrofluorocarbons (HFCs) and a particular type of hydrochlorofluorocarbon (HCFC), such as refrigerators, freezers and insulation foam boards, reported state news agency Xinhua. An interview with an environment ministry official on the state-run China Environment News noted that the policies “clarify” that the HFC controls “include exported household refrigerators and freezers”, although it “excludes vehicle-mounted refrigerators”. Experts had previously told Carbon Brief that exported products were not covered by an action plan to enhance China’s HFC controls published in April that governs these two policies.

ALL-IN ON HYDROGEN: “Green hydrogen” capacity is being “ramp[ed] up”, said Bloomberg, with several projects coming online in the past few months “after Beijing signaled its continued support” for the sector. The government has “backed [hydrogen] tech with several pilot projects this year” and allowed the sector to access “carbon credits to help with funding”, it added. China has also developed its first “coal-to-chemicals project integrating green hydrogen”, which is forecast to produce 71m cubic metres of hydrogen per year, according to Reuters. Meanwhile, the hydrogen industry has also launched its first “anti-involution” initiative, pledging to avoid or prohibit actions such as “below-cost bidding”, “false planning” and “blind pessimism”, said economic news outlet Jiemian.

Spotlight 

How China approached COP30 endgame

As negotiations at COP30 entered their final stages, China’s positions in several of the debates proved to be central to discussions.

Below is an excerpt of our coverage of what China said, wanted and got at COP30. The full article is available on Carbon Brief’s website.

Climate finance

One of China’s key priorities – the provision of “financial resources” from developed to developing countries under Article 9.1 of the Paris Agreement – proved to be a significant sticking point in negotiations.

With discussions on climate finance looming large, China proposed during the second week the development of a “practical roadmap for implementation”, predominantly by developed countries, of the $300bn per year “NCQG” climate-finance goal.

China delegation head Li Gao said this would help “avoid blame-shifting…and prevent further erosion of trust” on climate finance.

In the end, while COP30 resulted in a plan within the mutirão decision to develop a “two-year work programme on climate finance” that included a mention of Article 9.1, it was situated within the “context of Article 9…as a whole”. This means that developing countries’ contributions also fall under its scope.

“The EU needed to spend its biggest leverage [at COP30] to adjust the adaptation-finance goal,” Kate Logan, director of the China climate hub and climate diplomacy at the Asia Society Policy Institute (ASPI), told Carbon Brief.

EU-China non-alignment

There was a marked lack of EU-China coordination at COP30 overall, despite efforts to develop a united stance in July.

Multiple observers told Carbon Brief that early negotiations featured a rancorous back-and-forth between the two on the ambitiousness of their respective 2035 emissions reduction targets.

Another point of contention between the two was the role of “unilateral trade measures” (UTMs), which the “like-minded” bloc of developing countries (LMDCs, of which China is a member) asked to be included on the agenda.

Japan, the EU and others argued that other fora would be “more appropriate” for discussions. The EU also implied that China’s critical-mineral export restrictions could also fall into the scope of discussion, should the item be included.

Ultimately, China and others secured its inclusion in the mutirão text and agreement on three annual dialogues on UTMs, culminating in a “high-level event” and report in 2028.

China was also among the countries present for the COP30 presidency’s launch of an integrated forum on climate change and trade, although Carbon Brief understands that it has not formally joined the platform.

Meanwhile, a mention of critical minerals in a draft just-transition text – a potential first for COP – was deleted by the final version.

Joseph Dellatte, head of energy and climate studies at the Institut Montaigne, told Carbon Brief: “Even though the EU is worried about China’s trade measures on [critical materials], it still wants to strike a deal with Beijing.”

Fossil-fuel fracas

China also faced significant pressure on its approach to mitigating emissions.

It was not among countries supporting the idea of a roadmap away from fossil fuels as part of the COP30 outcome. It also opposed calls to emphasise the 1.5C temperature limit, instead “requesting the entire Paris Agreement temperature goal [which includes “well-below” 2C]…be mentioned”.

While the final mutirão text does emphasise the 1.5C limit, fossil fuels were not explicitly mentioned.

Arguments by China that the UAE dialogue should not become a “mini-GST [global stocktake]” also seem to have been considered, with no mention of an annual agenda item in the final outcomes.

The mutirão text “sends a red alert” on the consensus on fossil fuels, Greenpeace East Asia’s global policy advisor Yao Zhe told Carbon Brief.

But Li Shuo, director of ASPI’s China climate hub, said that, despite this, China’s prior agreement to transition away from fossil fuels would “guide its domestic energy reforms”.

Watch, read, listen

VISUALISING CHANGE: Greenpeace East Asia published its work with Chu Weimin, who has used drone photography to document how China’s clean-energy transition is reshaping “landscapes, communities and people’s everyday lives”.

CLIMATE ENVOY’S DEBRIEF: Climate envoy Liu Zhenmin explained why China felt a fossil-fuel roadmap was “unfeasible”, in a wide-ranging interview with the Paper held at the end of COP30.

NDC AMBITION: The Outrage + Optimism podcast spoke with Wang Yi, vice-chair of China’s expert panel on climate change, among others, during week two of COP30.

MISCONCEPTIONS: Wang Binbin, founding director of the Climate Future Global Innovation Lab, explained the thinking behind China’s climate strategy – and how mistranslations underplay its ambition – for China News.


60

The number of nuclear reactor units in China, once the newest unit at Fujian Zhangzhou nuclear power plant – the world’s “largest Hualong One nuclear power base” – completes final checks, Jiemian reported. The unit began delivering power to the grid on 22 November.


New science 

Climate warming and forest expansion significantly enhance China’s forest methane sink
Agricultural and Forest Meteorology

China’s forest methane sink “significantly increased” over 1982-2020, according to new research. The paper used a database of “forest methane fluxes” to produce a map of changes in forest methane uptake, finding that rising temperatures, decreasing soil moisture and forest expansion were the main drivers of the increased methane sink. The authors said their study “highlights the positive contribution of climate warming-drying and afforestation to methane sink enhancement”.

Quantifying global climate change impacts on daily record-breaking temperature events in China over the past six decades
International Journal of Climatology

A new study found that summer record-breaking high-temperature events occurred more frequently in China than “theoretically predicted”, while winter record-breaking low-temperature events occurred less frequently. The authors carried out statistical analysis of record-breaking events, using daily surface-air temperature data, collected over 1960-2023 from around 2,300 meteorological stations across China. They found a “more pronounced acceleration” in the frequency of high-temperature record-breaking events after the year 2020.

China Briefing is compiled by Wanyuan Song and Anika Patel. It is edited by Wanyuan Song and Dr Simon Evans. Please send tips and feedback to china@carbonbrief.org 

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China Briefing 27 November 2025: COP30 wraps; Climate and critical minerals at G20; Coal use up

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