Every year, understanding of climate science grows stronger.
With each new research project and published paper, scientists learn more about how the Earth system responds to continuing greenhouse gas emissions.
But with many thousands of new studies on climate change being published every year, it can be hard to keep up with the latest developments.
Our annual “10 new insights in climate science” report offers a snapshot of key advances in the scientific understanding of the climate system.
Produced by a team of scientists from around the world, the report summarises influential, novel and policy-relevant climate research published over the previous 18 months.
The insights presented in the latest edition, published in the journal Global Sustainability, are as follows:
- Questions remain about the record warmth in 2023-24
- Unprecedented ocean surface warming and intensifying marine heatwaves are driving severe ecological losses
- The global land carbon sink is under strain
- Climate change and biodiversity loss amplify each other
- Climate change is accelerating groundwater depletion
- Climate change is driving an increase in dengue fever
- Climate change diminishes labour productivity
- Safe scale-up of carbon dioxide removal is needed
- Carbon credit markets come with serious integrity challenges
- Policy mixes outperform stand-alone measures in advancing emissions reductions
In this article, we unpack some of the key findings.
A strained climate system
The first three insights highlight how strains are growing across the climate system, from indications of an accelerating warming and record-breaking marine heatwaves, to faltering carbon sinks.
Between April 2023 and March 2024, global temperatures reached unprecedented levels – a surge that cannot be fully explained by the long-term warming trend and typical year-to-year fluctuations of the Earth’s climate. This suggests other factors are at play, such as declining sulphur emissions and shifting cloud cover.
(For more, Carbon Brief’s in-depth explainer of the drivers of recent exceptional warmth.)
Ocean heat uptake has climbed as well. This has intensified marine heatwaves, further stressing ecosystems and livelihoods that rely on fisheries and coastal resources.
The exceptional warming of the ocean has driven widespread impacts, including massive coral bleaching, fish and shellfish mortality and disruptions to marine food chains.
The map below illustrates some of the impacts of marine heatwaves from 2023-24, highlighting damage inflicted on coral reefs, fishing stocks and coastal communities.
Land “sinks” that absorb carbon – and buffer the emissions from human activity – are under increasing stress, too. Recent research shows a reduction in carbon stored in boreal forests and permafrost ecosystems.
The weakening carbon sinks means that more human-caused carbon emissions remain in the atmosphere, further driving up global temperatures and increasing the chances that warming will surpass the Paris Agreement’s 1.5C limit.
This links to the fourth insight, which shows how climate change and biodiversity loss can amplify each other by leading to a decrease in the accumulation of biomass and reduced carbon storage, creating a destabilising feedback loop that accelerates warming.
New evidence demonstrates that climate change could threaten more than 3-6 million species and, as a result, could undermine critical ecosystem functions.
For example, recent projections indicate that the loss of plant species could reduce carbon sequestration capacity in the range of 7-145bn tonnes of carbon over the coming decades. Similarly, studies show that, in tropical systems, the extinction of animals could reduce carbon storage capacity by up to 26%.
Human health and livelihoods
Growing pressure on the climate system is having cascading consequences for human societies and natural systems.
Our fifth insight highlights how groundwater supplies are increasingly at risk.
More than half the global population depends on groundwater – the second largest source of freshwater after polar ice – for survival.
But groundwater levels are in decline around the world. A 2025 Nature paper found that rapid groundwater declines, exceeding 50cm each year, have occurred in many regions in the 21st century, especially in arid areas dominated by cropland. The analysis also showed that groundwater losses accelerated over the past four decades in about 30% of regional aquifers.
Changes in rainfall patterns due to climate change, combined with increased irrigation demand for agriculture, are depleting groundwater reserves at alarming rates.
The figure below illustrates how climate-driven reductions in rainfall, combined with increased evapotranspiration, are projected to significantly reduce groundwater recharge in many arid regions – contributing to widespread groundwater-level declines.
These losses threaten food security, amplifying competition for scarce resources and undermining the resilience of entire communities.
Human health and livelihoods are also being affected by changes to the climate.
Our sixth insight spotlights the ongoing and projected expansion of the mosquito-borne disease dengue fever.
Dengue surged to the largest global outbreak on record in 2024, with the World Health Organization reporting 14.2m cases, which is an underestimate because not all cases are counted.
Rising temperatures are creating more favourable conditions for the mosquitoes that carry dengue, driving the disease’s spread and increasing its intensity.
The chart below shows the regions climatically suitable for Aedes albopictus (blue line) and Aedes aegypti (green line) – the primary mosquitoes species that carry the virus – increased by 46.3% and 10.7%, respectively, between 1951-60 and 2014-23.
The maps on the right reveal how dengue could spread by 2030 and 2050 under an emissions scenario broadly consistent with current climate policies. It shows that the climate suitable for the mosquito that spreads dengue could expand northwards in Canada, central Europe and the West Siberian Plain by 2050.
The ongoing proliferation of these mosquito species is particularly alarming given their ability to transmit the zika, chikungunya and yellow fever viruses.
Heat stress is also a growing threat to labour productivity and economic growth, which is the seventh insight in our list.
For example, an additional 1C of warming is projected to expose more than 800 million people in tropical regions to unsafe heat levels – potentially reducing working hours by up to 50%.
At 3C warming, sectors such as agriculture, where workers are outdoors and exposed to the sun, could see reductions in effective labour of 25-33% across Africa and Asia, according to a recent Nature Reviews Earth & Environment paper.
Meanwhile, sectors where workers operate in shaded or indoor settings could also face meaningful losses. This drain on productivity compounds socioeconomic issues and places a strain on households, businesses and governments.
Low-income, low-emitting regions are set to shoulder a greater relative share of the impacts of extreme heat on economic growth, exacerbating existing inequalities.
Action and policy
Our report illustrates not only the scale of the challenges facing humanity, but also some of the pathways toward solutions.
The eighth insight emphasises the critical role of carbon dioxide removal (CDR) in stabilising the climate, especially in “overshoot” scenarios where warming temporarily surpasses 1.5C and is then brought back down.
Scaling these CDR solutions responsibly presents technical, ecological, justice, equity and governance challenges.
Nature-based approaches for pulling carbon out of the air – such as afforestation, peatland rewetting and agroforestry – could have negative consequences for food security, biodiversity conservation and resource provision if deployed at scale.
Yet, research has suggested that substantially more CDR may be needed than estimated in the scenarios used in the Intergovernmental Panel on Climate Change (IPCC’s) last assessment report.
Recent findings showed that a pathway where temperatures remain below 1.5C with no overshoot would require up to 400Gt of cumulative CDR by 2100 in order to buffer against the effect of complex geophysical processes that can accelerate climate change. This figure is roughly twice the amount of CDR assessed by the IPCC.
This underscores the need for robust international coordination on the responsible scaling of CDR technologies, as a complement to ambitious efforts to reduce emissions. Transparent carbon accounting frameworks that include CDR will be required to align national pledges with international goals.
Similarly, voluntary carbon markets – where carbon “offsets” are traded by corporations, individuals and organisations that are under no legal obligation to make emission cuts – face challenges.
Our ninth insight shows how low-quality carbon credits have undermined the credibility of these largely unregulated carbon markets, limiting their effectiveness in supporting emission reductions.
However, emerging standards and integrity initiatives, such as governance and quality benchmarks developed by the Integrity Council for Voluntary Carbon Markets, could address some of the concerns and criticism associated with carbon credit projects.
High-quality carbon credits that are verified and rigorously monitored can complement direct emission reductions.
Finally, our 10th insight highlights how a mix of climate policies typically have greater success than standalone measures.
Research published in Science in 2024 shows how carefully tailored policy packages – including carbon pricing, regulations, and incentives – could consistently achieve larger and more durable emission reductions than isolated interventions.
For example, in the buildings sector, regulations that ban or phase out products or activities achieve an average effect size of 32% when included in a policy package, compared with 13% when implemented on their own.
Importantly, policy mixes that are tailored to the country context and with attention to distributional equity are more likely to gain public support.
These 10 insights in our latest edition highlight the urgent need for an integrated approach to tackling climate change.
The science is clear, the risks are escalating – but the tools to act are available.
The post Guest post: 10 key climate science ‘insights’ from 2025 appeared first on Carbon Brief.
Even measures designed to help, like air conditioning, can create vicious cycles that lead to hotter temps.
It’s about to get hotter in our nation’s cities. Just how hot it gets depends not only on the weather, but also on infrastructure, working conditions and ZIP codes.
The Turkish government has announced the dates and venues for the COP31 leaders’ summit and pre-COP meetings, and appointed a Turkish waste campaigner and Australian cattle farmer as climate “champions”.
In an open letter, published by the UN climate body on Tuesday, the Turkish environment minister and COP31 President-Designate Murat Kurum said the COP31 World Leaders’ Summit, at which dozens of heads of government are expected, will take place in Antalya, on Türkiye’s south coast, on November 11 and 12.
Previous leaders’ summits have taken place on the first two days of the COP negotiations or, at last year’s conference in Belém, before the start. But this year’s gathering will take place on the third and fourth day (Wednesday and Thursday) of the November 9-20 talks. Kurum said the summit “will be a key moment in generating political momentum and visibility for COP31”.
Last November, when Türkiye was chosen as host of the annual UN climate summit, Kurum said that, while the negotiations would be in the resort city of Antalya, the leaders’ summit would take place in the country’s largest city Istanbul. No explanation for the change of decision was given in Kurum’s letter.
Pacific pre-COP
Every COP conference is preceded by a smaller pre-COP gathering, attended by government climate negotiators. Because of a deal struck with Australia, which gave up its bid to physically host the summit in exchange for leading the COP31 discussions, this year’s pre-COP will take place on the Pacific island of Fiji, with a “leaders’ event” a 2.5-hour flight north in Tuvalu.
Kurum’s letter said both events would take place between October 5-8 and “will contribute to reflecting diverse perspectives in an inclusive manner”.
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The letter confirms that Australia’s climate and energy minister, Chris Bowen, will be given the title of “President of Negotiations” and “will have exclusive authority in leading the COP31 Negotiations, in consultation with Türkiye”.
“I have complete faith in his work,” said Kurum, adding that the two will send out a joint letter “in the coming weeks” which outlines their priorities regarding the negotiations.
The COP negotiations will be discussed at the annual Petersberg Climate Dialogue in Berlin on April 21 and 22. German State Secretary Jochen Flasbarth recently announced plans to travel to Australia and meet with Bowen to discuss the talks.
COP31 champions
In his letter, Kurum announced that Samed Ağırbaş, president of Türkiye’s Zero Waste Foundation, which was set up by the country’s First Lady, has been appointed as the COP31 Climate High-Level Champion, tasked with working with business, cities and regions and civil society to promote climate action.
Sally Higgins, a young Australian cattle farmer and sustainability consultant who has also carried out research on land-use change, has been appointed as Youth Climate Champion. Kurum said she “is a passionate advocate for climate change and elevating the voices of young people”.
Turkish officials Fatma Varank, Halil Hasar and Mehmet Ali Kahraman have been appointed as COP31 CEO, Chief Climate Diplomacy Officer and Director of the COP31 Presidency Office respectively. Deputy environment ministers Ömer Bulut and Burak Demiralp will lead on construction and infrastructure, and operational and logistical processes.
Kurum said Türkiye’s Presidency would continue to use the Troika approach – a term coined two years ago under Azerbaijan’s COP29 Presidency, which worked with the previous Emirati COP28 and subsequent Brazilian COP30 hosts.
Kurum said the Troika approach offers “stability and predictability by connecting past, current and future presidencies” and that “in this regard” Türkiye and Australia would work “in close cooperation with Azerbaijan and Brazil”. This appears to overlook the 2027 COP32 host – Ethiopia.
The post Türkiye sets COP31 dates and appoints Australian cattle farmer as youth champion appeared first on Climate Home News.
Türkiye sets COP31 dates and appoints Australian cattle farmer as youth champion
Mae Buenaventura is the manager of the debt justice programme of the Asian Peoples’ Movement on Debt and Development, a regional alliance of peoples’ movements, community organizations, coalitions, NGOs and networks
A potentially historic shift in public debt governance is set to unfold in Washington DC this week as Global South governments take a collective stand to stop a “silent killer” of development financing.
The first-ever UN-hosted borrowers’ forum will officially be launched on April 15 on the sidelines of the 2026 Spring Meetings of the International Monetary Fund (IMF) and the World Bank. Led by five convening countries – Zambia, Egypt, Nepal, the Maldives and Pakistan – the initiative is one of the key wins of last year’s 4th Financing for Development Conference (FFD4) in Sevilla, Spain.
The forum’s mandate is to establish a platform for borrower countries, supported by a UN secretariat, “to discuss technical issues, share information and experiences in addressing debt challenges, increase access to technical assistance and capacity-building in debt management, coordinate approaches and strengthen borrower countries’ voices in the global debt architecture”.
Instead of facing lenders alone, these countries will now use a UN-backed platform to share technical expertise and coordinate their approach to a global debt system that is fundamentally broken.
Debt grips climate-vulnerable nations
The human cost of the current debt architecture is staggering. According to the UN trade and development agency, UNCTAD, more than 40% of the global population – roughly 3.4 billion people – live in countries where the government is forced to spend more on debt payments than on the health, education and social protection of its citizens.
In so-called low-income countries, governments spend an average of 7.5% of their total budgets on debt service, with interest payments consuming up to 20% of total government revenue in these regions.
The Philippines is a case study in this financial stranglehold. It is part of a global majority forced to watch its public services crumble and infrastructure lag while its wealth is siphoned off to satisfy foreign lenders.
The policy of automatic appropriations – a legacy of the rule of late former President Ferdinand Marcos Sr. – mandates that debt servicing takes precedence over any other public expenditure, effectively placing the demands of lenders above the needs of the Filipino people. Even as it faces a $1.5 trillion regional financing gap to achieve the Sustainable Development Goals (SDGs) by 2030, its hands remain tied by a legal framework that values credit ratings over human lives.
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As a “middle-income country” (MIC), the Philippines is stuck in a frustrating purgatory. It is often deemed “too wealthy” for the G20’s debt-relief framework, yet too poor to absorb global economic shocks. Last year, Finance Undersecretary Joven Balbosa hit the nail on the head when he called for support that goes “beyond the simplistic income categorization” that ignores a country’s actual vulnerabilities.
Without an inclusive and equitable global debt architecture, nations including the Philippines are left to navigate catastrophic climate risks and economic shocks with zero fiscal breathing space.
No respite during climate disasters
The regional evidence of this systemic failure is everywhere. Take Pakistan, which in 2022 was hit by catastrophic flooding that submerged a third of the country and caused billions in losses. Despite this climate-driven disaster, World Bank data shows that Pakistan made payments in 2023 of $11.8 billion for public and publicly guaranteed (PPG) external debt, while its PPG external debt reached $93 billion that same year, surpassing pre-pandemic debt of $87 billion (2020).
Sri Lanka followed IMF prescriptions throughout 16 lending programs since 1991, only to become the first Asian country this century to default. Its MIC status prevents application for debt relief and restructuring measures. Today, the Sri Lankan people bear the brunt of harsh conditionalities, including raising VAT from 8% to 15%, slashing food and fuel subsidies, and the erosion of hard-earned worker pensions.
Currently, the global rules of lending and borrowing are set by a “creditors’ club” composed of the IMF, the World Bank and the Global Sovereign Debt Roundtable it set up, and the Paris Club.
These institutions measure “debt sustainability” through a narrow lens of a country’s capacity to make timely repayments. They largely ignore internal economic inequalities, gender disparities and the existential threat of climate change.
Crises should trigger debt service cancellation
By organising the new borrowers’ forum, the Global South is signalling that the era of passive “standard-setting” by lenders is over.
The ultimate goal for global civil society and debt justice movements is the establishment of a UN Debt Convention; a democratic, binding and inclusive framework that governs both lenders and borrowers. This mechanism would ensure that debt restructuring and cancellation are sufficient to allow countries to fulfill their international human rights obligations and implement necessary climate actions.
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To be truly transformative, debt sustainability analyses must align with human rights and sustainable development needs. This means conducting impact assessments – both before and after loans are issued – to identify “illegitimate” debts that do not benefit the public.
Crucially, we need an automatic debt service cancellation mechanism that triggers during extreme climatic, environmental or health shocks. We also need a binding global debt registry to ensure that every loan is transparent and subject to public scrutiny.
Whether the borrowers’ forum becomes a true milestone depends on its courage to challenge the status quo. We can no longer allow debt to act as a “silent killer” of our future. It is time to demand a financial system that serves humanity, not just the balance sheets of the powerful.
The post Broken debt system must be fixed to confront future climate shocks appeared first on Climate Home News.
Broken debt system must be fixed to confront future climate shocks
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