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The UK’s climate saw a record-breaking 2025, with the year being both the warmest and sunniest seen since observations began.

The year 2025 has joined 2024, 2023, 2022 and 2014 in the UK’s top-five warmest years.

In this review, we take a look back at the UK’s climate in 2025 and place the record-breaking year in the context of human-caused climate change. We find:

  • It was the warmest and sunniest year on record. January and September were the only months that were cooler than average.
  • A Met Office attribution study estimates that 2025’s average temperature would have been exceptionally unlikely in pre-industrial times – but could now occur, on average, every three years. 
  • Spring was the warmest on record, breaking a record set in 2024.  
  • Spring was not only the sunniest on record, but the fourth-sunniest season ever recorded, after the summers of 1976, 1996 and 1911. 
  • It was the warmest summer on record. The summer temperature record was made around 70 times more likely due to human-induced climate change.
  • The persistent high-pressure systems in spring and summer, which contributed to the warm and sunny conditions, also resulted in an extended dry spell – including the driest spring since 1974.
  • Wetter conditions at the end of the year alleviated some of the rain shortfall. The year concluded with 90% of average annual rainfall.
  • Storm Éowyn in late January was the most powerful wind storm in over a decade and the most severe storm in Northern Ireland since 1998. 
  • Storm Floris in early August was not unprecedented for a storm, but was one of the most severe wind storms to affect Scotland during the summer.
  • Storm Amy in early October hit north-western parts of the UK, with heavy rain falling widely, resulting in the wettest day of the year for the UK overall.

(See our previous annual analysis for 2024, 2023, 2022, 2021, 2020, 2019 and 2018.)

The year in summary

The Met Office relies on the long-running HadUK-Grid dataset to place recent UK weather and climate into its historical context. The gridded, geographically complete dataset combines observational data for monthly temperature since 1884, rainfall since 1836 and sunshine since 1910.

Unless stated otherwise, the rankings of events and statements (such as “warmest on record”) in this article relate to the HadUK-Grid series.

The “climate anomaly” maps below show the difference between the average temperature (left), rainfall total (middle) and sunshine duration (right) between 2025 and the 1991-2020 period. In other words, they show how much warmer, cooler, wetter, drier, sunnier or cloudier the year was than average for each county of the UK.

Maps showing anomalies in 2025 relative to a 1991-2020 reference period for temperature (C), precipitation (%) and sunshine (%). The darker shading indicates a greater departure from average. Credit: Met Office
Maps showing anomalies in 2025 relative to a 1991-2020 reference period for temperature (C), precipitation (%) and sunshine (%). The darker shading indicates a greater departure from average. Credit: Met Office

The maps show that the whole country was warmer than average, with central and north-east England, parts of Northern Ireland and the tip of north-west Scotland, Orkney and Shetland seeing the greatest change.

The UK overall had 90% of average rainfall. The driest regions relative to average were around Essex, Moray and Aberdeenshire, which received less than 75% of normal annual rainfall.

In contrast, some western counties were slightly wetter than average – including Cornwall (110%) and Cumbria (107%).

Sunshine was above average across the UK, with eastern England and north Scotland exceeding 120% of the average.

Attribution

The UK’s absolute temperature averaged at 10.09C in 2025. This follows 2022 (at 10.03C) as the second time that the annual average temperature has exceeded 10C.

In our analysis of the UK’s climate in 2022 for Carbon Brief, we reported on a Met Office attribution study that found that human-caused climate change had increased the likelihood of UK annual absolute temperature averaging above 10C by a factor 160.

That study concluded that exceeding 10C – while unprecedented in the historical observational record – would become increasingly common and would likely occur every three-to-four years.

Three years on from that analysis and the 10C threshold has been breached for a second time – and an updated attribution analysis has been produced exploring the likelihood of a return of temperatures above the 10.09C recorded in 2025.

The study, which uses the same methodology as the 2022 paper, finds that UK annual mean temperatures above 10.09C are estimated to occur approximately every three years in the current climate. In contrast, they would have occurred around every 780 years in pre-industrial times.

Human-caused climate change has, therefore, increased the probability of average temperatures in excess of 10.09C by a factor of 260.

These results show that 2025’s record-breaking annual temperature – while unprecedented in the historical observational record – should be considered fairly normal in the current climate.

Climate projections indicate that, by the later part of the 21st century, a year like 2025 could be a relatively cool year.

The figure below compares observations of UK annual average temperatures (black line) – relative to the long-term average – to climate model simulations that include (red/purple) or exclude (green) human-caused emissions of greenhouse gases and land-use change.

The green and red curves start to diverge from around the 1980s, suggesting that human influence is indeed the dominant factor in the warming trend. The shaded range of the simulations show that in our current and future climate, much warmer years than 2025 are plausible.

Colder years are also still possible, but it is much less likely that we would experience a cold year like 2010 – and exceptionally unlikely for a year to be in the top-10 coldest years for the UK. The most recent year to feature in the top-10 coldest years was 1963.

Chart showing the time series for observation data and model scenario smoothed over 20 years
Timeseries of the UK annual mean temperature anomaly (w.r.t. 1901 – 1930). Observational data from HadUK-Grid (black). Simulations from the CMIP6 historical simulation including natural and human-caused drivers (red), SSP2-4.5 projections of future climate based on a “medium” emissions scenario (purple) and “hist-nat” simulations that include only natural drivers of climate such as solar and volcanic activity (green). Simulation data is represented as median values and filled 5-95th percentile ranges explored by members of the multi-model ensemble. Percentiles of simulation data are smoothed with a rolling window of 20 years, with historical and SSP2-4.5 combined into one continuous series. Observed data runs from 1884-2025. Credit: Met Office

Warmer, wetter, sunnier

Four of the UK’s last five years all appear in the top-five warmest years since 1884.

The Central England Temperature (CET) series is the longest continuous instrumental climate record in the world, dating back to 1659. Covering a region roughly enclosed by Lancashire, London and Bristol, it does not represent the whole of the UK. However, when averaged across a year and analysed across centuries, it does provide a multi-century perspective that is representative of climate variations and changes that impacted the UK.

As with the HadUK-Grid temperature record, the CET series also identifies 2025 as the warmest year on record. The longer-running temperature series identifies the same five years – in the same order – as the warmest on record. This is shown in the table below. 

Year UK (from HadUK-Grid) Central England Temperature
2025 10.09C 11.23C
2022 10.03C 11.18C
2023 9.97C 11.13C
2014 9.88C 11.04C
2024 9.79C 10.96C

The graph below of the CET series shows that temperatures recorded in recent years are well outside the range of variability recorded over more than 300 years.

Chart showing the mean temperature in England from 1659 to 2025
Average temperature anomalies (relative to a 1961-90 average) for each year in the CET series from 1659 to 2025. Colours show years that are above (red) or below (blue) average. The dashed line is a smoothed series to show the decadal variations and trend. Credit: Met Office

However, the UK is not only warming, it is also getting wetter and sunnier. The year 2025 was relatively dry, recording 90% of average rainfall. This made it the driest year recorded since 2010 and put it in contrast to relatively wet years in 2023 and 2024.

The longer-term trend can be seen in the figure below, which shows that 2025 was relatively dry compared to recent decades, but not exceptional in the longer-term historical context.

The last time the UK had a year in the top-10 driest was in 1955, whereas all five of the top-10 wettest years have occurred this millennium. The wettest year on record still stands as 1872.

Chart showing the total rainfall from 1836 to 2025 in the UK.
Timeseries of UK total rainfall from 1836 to 2025. The trend is represented by a black dashed line, the 1991-2020 average is shown in pink and the highest and lowest values in the series are shown by the red and blue dashed lines, respectively. The 2025 value is represented by the horizontal brown line. Credit: Met Office

The drivers of annual rainfall trends are more complex than for temperature.

A significant factor in rainfall trends is a warming atmosphere’s ability to hold more moisture. However, this does not completely account for recent increases in rainfall.

Large-scale atmospheric circulation patterns – particularly features such as the jet stream and associated storm tracks across the North Atlantic – also play a crucial role. These are influenced by annual and decadal fluctuations in the Earth’s climate, as well as human-caused climate change.

UK annual sunshine totals have also been rising since the 1980s, with 2025 setting a record by a considerable margin. This is in sharp contrast to 2024, which was the dullest year since 1998. This is shown in the graph below, where the dotted line shows the underlying long-term trend, with year-to-year variations removed.

Chart showing the total annual sunshine hours from 1910 to 2025 in the UK.
Timeseries of UK total annual sunshine hours from 1910 to 2025. The trend is represented by a black dashed line, the 1991-2020 average is shown in pink and the highest and lowest values in the series are shown by the red and blue dashed lines, respectively. The 2025 value is represented by the horizontal brown line (which covers the red line for the highest in the record). Credit: Met Office

The cause of the sunshine trend is also uncertain, with both natural climate variability and human activity (through reduced regional air pollution caused by a reduction in aerosol emissions) potential contributors. Climate projections do not provide any strong evidence for how sunshine trends might develop.

The year in storms

The Met Office has been naming storms since 2015. Each storm-naming period runs from September to August.

(For more on storm naming in the UK, read Carbon Brief’s explainer.)

The criteria for storm naming has changed over time. It accounts for meteorological conditions, as well as the potential severity of impacts. As a result, comparisons between years can indicate relative levels of storm activity, but should not be done on a like-for-like basis.

Between the 2015-16 and 2024-25 storm seasons, there have been, on average, 7.7 named storms each year, with a high of 12 recorded in the 2023-24 season and a low of four over 2022-23. This is shown in the line chart below.

Chart showing the total number of named storms in UK from 2015 to 2025.
Timeseries of the number of named storms for each storm-naming period (which runs from September to August) since 2015. It includes storms named by other Met Services that impacted the UK. Source: Met Office

By this measure, 2025 was not exceptional with six named storms – two from the 2024-25 season and four from 2025-26. These are listed in the table below. 

Storm name Date(s) of impact in UK Maximum wind gust Notable features
2024-25 names
Éowyn 24 January 87Kt (100mph), Drumalbin, Lanarkshire Most powerful storm for over a decade
Floris 4-5 August 71Kt (82mph) at Wick Airport, Caithness Equalled Scotland’s August gust speed record
2025-26 names
Amy 3-4 October 83Kt (96mph) at Tiree, Argyll Significant disruption from flooding.
Benjamin (named by Meteo France) 22-23 October 52Kt (60mph) Needles, Isle Of Wight Strongest winds affected northern France
Claudia (named by AEMET, Spain) 14 November 59Kt (68mph) Warcop Range, Cumbria Extensive heavy rainfall across England and Wales
Bram 8-10 December 73Kt (84mph), Capel Curig, Conwy Flooding from heavy rainfall on saturated ground.

Credit: Met Office storm centre

Storm Éowyn in January had the most severe winds of any storm in 2025. The Met Office issued a red warning for wind across Northern Ireland and the south-west and central belt of Scotland. An amber warning was issued for the northern half of the UK. At the peak of the storm, power outages were reported at around 1m homes.

Storms from October to December were notable for bringing some persistent and heavy rain during a period of wetter weather, in contrast to the extended dry spell earlier in the year.

Weather through the year

The charts below show the progression of temperature and rainfall through the course of 2025.

The plot below charts average daily temperature over the course of 2025, with orange shading showing warmer-than-average conditions. Overall, the year had 244 days – 66% of the total – where temperatures were above average.

On the other hand, cold spells – indicated by blue shading – were generally short-lived and not very severe, with the exception of events in early January and November.

Chart showing mean temperature in the UK in 2025
Timeseries of daily UK average temperature during 2025. Orange shading indicates periods of above-average temperature and blue shading below average. The solid black line is the 1991-2020 reference period by day of the year. The grey shading reflects the 5th, 10th, 90th and 95th percentiles of the temperature distribution and the red and blue lines are the highest and lowest values for each day of the year, based on a dataset of daily data from 1960. Credit: Met Office

Fifty-one days in 2025 were in the top 5% warmest for the time of year in the historical record, but only one day – 20 November – was in the 5% of coldest.

The significant number of warmer days and absence of cool ones helps build a picture of how 2025 was the warmest year overall.

The highest daily maximum temperature recorded in the year was 35.8C at Faversham, Kent on 1 July during an early summer heatwave. The lowest minimum temperature was -18.9C, recorded at Altnaharra, Sutherland on 11 January.

A maximum annual temperature of 35.8C is not an exceptional high for recent years – especially when compared with 2022’s record of 40.3C. However it would have been a rare event in the 20th century, when just three years – 1932 (36.1C), 1976 (35.9C) and 1990 (37.1C) – saw a higher temperature.

In the 21st century, six years have seen temperatures above 35.8C – 2003, 2006, 2015, 2019, 2020, and 2022.

The plot below illustrates 2025’s below-average rainfall accumulation.

The brown shading – which represents the deficit in rainfall at that point of the year compared to the 1991-2020 average – highlights how rainfall totals were particularly low during the dry spring and summer period. The lower blue line shows how rainfall accumulation in 2025 came close to – but did not quite reach – a record low in late May and late August.

Wetter conditions in the autumn saw rainfall totals recover a little to reach 90% at the end of the year – which is below average, but not exceptional. As noted previously, there were regional variations.

Chart showing the total amount of rainfall in the UK in 2025
Timeseries showing rainfall accumulation through 2025 for the UK. Brown shading represents a deficit in rainfall compared to average for that point in the year, and blue shading is an excess of rainfall compared to average. The solid line represents the 1991-2020 average and grey shading shows the 5th, 10th, 90th and 95th percentiles of the distribution. The blue and red lines represent the lowest and highest values based on a dataset of daily rainfall from 1891 to 2022. Credit: Met Office

Winter

In climate terms, the UK winter spans the calendar months of December, January and February.

The winter of 2024-25 was slightly warmer than average, but not exceptional, with an average temperature of 4.62C. This is 0.53C above the 1991-2020 average. The winter months had 89% of average rainfall and 94% of average sunshine.

New Year’s Day saw significant flooding that affected parts of Lancashire and the south side of Manchester. The River Mersey reached record levels in the wake of two days of heavy, persistent rain.

The coldest spell of 2025 occurred in early January, with significant snowfall in some regions.

Storm Éowyn and heavy rain at the end of January were the winter’s most impactful events, bringing high winds and flooding that resulted in considerable disruption.

Spring

Spring – which encompasses the months of March, April and May – was the warmest and sunniest on record, as well as the sixth driest.

The record high temperature came only one year after the previous record set in 2024, continuing a trend of increasing spring time temperature for the UK.

(A Met Office attribution analysis which explored the record-breaking temperatures of May 2024 showed that the temperatures were caused by a combination of a marine heatwave which persisted through May and into June and human-induced climate change.)

The timeseries below shows average spring temperature in the UK over 1884-2025. It shows a significant warming trend since the 1970s, with temperatures in 2024 and 2025 sitting well outside the range of variability observed in the late 19th and 20th centuries.

Chart showing the mean temperature for UK spring from 1885 to 2025.
Timeseries of spring average absolute temperature for the UK over 1884-2025. The trend is represented by a black dashed line, the 1991-2020 average is shown in pink and the highest and lowest values in the series are shown by the red and blue dashed lines, respectively. The 2025 value is represented by the horizontal brown line (which covers the red line for the highest in the record). Credit: Met Office

The UK’s changing climate is having an impact on the natural cycles of many species and habitats. Citizen science initiatives have highlighted how “signs of spring” – for instance, the first flowering or first nest-building – occur increasingly early in the year.

Summer

Warm, sunny and dry conditions persisted into the summer season, drying out soils.

There were four heatwave events, which impacted almost all regions of the UK. Two of these events took place in June.

A marine heatwave also took place, with sea surface temperatures of 1.5-3C above the 1983-2012 average in the Celtic Sea, English Channel and southern North Sea.

An attribution study by the World Weather Attribution service estimated that human-caused climate change had made exceeding June heatwave thresholds around 10 times more likely. The research also found that one of the June heatwaves had been made 2-4C more intense as a result of human influence.

The five warmest summers recorded in the UK to date are 2025 (16.10C), 2018 (15.76C), 2006 (15.75C), 2003 (15.74C) and 2022 (15.71C).

Met Office analysis estimates that in a pre-industrial climate, a summer like 2025 would be expected to occur every 340 years. However, in the current climate, we could expect to see these sorts of summers roughly once every five years.

The study also shows that the UK could plausibly experience much hotter summers in the current and future climate. Events that would have been seen as extremes in the past are becoming more common.

A Met Office attribution study published in 2019 estimated that the then record-breaking summer of 2018 had a statistical return period of approximately eight-to-nine years. The summer of 2025 has broken that record in seven years, consistent with these previous findings.

The science is clear that UK summers are becoming warmer and extreme heat events are becoming more common. This could mean more significant impacts on people, infrastructure and the environment – both now and in the future.

The map below plots the number of heatwaves that took place in June, July and August across the UK. It shows how a significant number of regions across saw more three (green shading) or four (pink shading) over the summer months.

Map of the UK showing the number of heatwaves from June to August 2025
Map showing the number of heatwaves by location during the summer of 2025. Source: Met Office

Autumn

Autumn and the month of December were marked with unsettled weather, with mild and wet conditions over the four-month period.

The season was warmer and wetter than average. Northern Ireland had its third-wettest autumn on record, Northern England its fifth wettest and Wales its 10th wettest.

Storm Amy set a record for highest gust speed for a storm in October, with 80Kt (92mph) recorded at Magilligan, County Londonderry.

Other major storms were notable for heavy rainfall that caused flooding. Storm Claudia brought heavy rainfall to central England and Wales in mid-November, which fell on already saturated ground.

The second half of November saw snow cause across the North York Moors during a cold northerly spell which saw some hard frosts. This was followed by generally mild and unsettled conditions until late December, when strong easterly winds brought more low temperatures and hard frosts.

The UK chalked up a number of significant climate records in 2025, particularly for high temperatures. This aligns with the well-established warming trend that is the result of human-caused climate change.

Climate attribution studies continue to provide further evidence that human factors are increasing the likelihood and severity of UK climate extremes.

Many of 2025’s records will not stand for long. There is a high chance they will be broken again in the near future as the climate continues to warm.

The post Met Office: A review of the UK’s climate in 2025 appeared first on Carbon Brief.

Met Office: A review of the UK’s climate in 2025

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EU, UK lead push for electrification as “powerful weapon” against fossil fuels

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Dozens of governments led by the EU and the UK have pledged to throw their political weight behind a rapid electrification of the world’s economy, billed as a “powerful weapon” for cutting reliance on planet-heating fossil fuels.

At a high-level summit in London’s Mansion House on Tuesday, energy ministers and business leaders were joined by UN secretary-general António Guterres in calling for faster action to curb demand for oil, coal and gas by powering homes, industry and transport with clean electricity.

Electrification – which spans measures such as switching from petrol cars to electric vehicles – has emerged as a key priority in climate and energy policy circles this year.

COP31 co-hosts Türkiye and Australia have made a global target for electricity to meet 35% of final energy demand by 2035, up from around 20% today, the main plank of this year’s action agenda for the UN summit. Reaching that level is necessary to keep the 1.5C warming limit within reach, according to the International Renewable Energy Agency (IRENA).

Turkish COP31 President-Designate Murat Kurum said earlier this month that the host nation would work to forge “a strong global coalition that is ready and determined to act” and promised to facilitate access to technical assistance.

    Rallying support for electrification

    Five months before countries are due to sign on to the pledge, efforts to rally support gathered momentum at London Climate Action Week, as a record-breaking heatwave baking the capital underscored the urgency of weaning the world off fossil fuels.

    Guterres said the world faces an “historic opportunity” to turn the page on its dependence on fossil fuels and fully embrace clean electrification powered by renewables.

    “The age of clean electrification is here,” he added. “The question is whether we can build the grids and storage, mobilize the investment, and deliver the infrastructure at the speed and scale required”.

    Without investment and government policies supporting upgrades in infrastructure, ageing power grids are often unable to handle the growing influx of renewable energy, creating bottlenecks and slowing the energy transition, according to the International Energy Agency (IEA).

    Meanwhile, the high upfront costs of buying electric vehicles, heat pumps and industrial equipment remains a challenge to switch households and businesses away from using fossil fuels across the world, according IEA analysts, despite these technologies being cheaper over their whole lifecycle.

    Global coordination platform

    In a bid to overcome these hurdles, the European Commission and the UK government on Tuesday launched a new platform to coordinate global progress on electrification.

    EU energy commissioner Dan Jorgensen said the goal was to build coalitions, draw up policy recommendations, share best practice and secure new funding to speed up the electrification of homes, industry and transport.

    Brazil’s COP30 presidency, the joint Australia-Türkiye COP31 presidency, Ethiopia’s incoming COP32 presidency, Canada, the Philippines and South Korea joined the initiative at launch.

    Jorgensen urged governments worldwide to “choose transformation over turbulence” and switch to clean electricity to make economies and societies more resilient and shield them from future shocks driven by volatile fossil fuels.

    COP31 leaders unveil global targets, with spotlight on electrification

    For many countries, especially those heavily reliant on imported fossil fuels, the oil and gas crisis triggered by the US and Israeli attacks on Iran and the ensuing blockade of the Strait of Hormuz has driven home the urgency of the clean energy transition.

    The UK’s energy secretary Ed Miliband said on Tuesday that, unlike previous fossil fuel shocks, clean electrification now offers the world a clear alternative.

    “An alternative that cannot be disrupted by foreign wars, that isn’t subject to global shocks because it is locked in stable prices at home, and that can create good jobs and drive growth,” he added, “an alternative that can deliver national security, energy security and indeed climate security.”

    At the recent conference on transitioning away from fossil fuels in Santa Marta, a group of 60 governments led by the Netherlands and Colombia said electrification is one of the areas where they can align work with the UN climate talks.

    Financial reforms needed

    Achieving the electrification target – dubbed the “35 by 35” goal – will require significant financial resources. Investments in power grids alone need to double from their current rate to around $1 trillion each year in the next decade, according to IRENA.

    But Guterres said that developing countries are still “starved from investment” in their clean energy sector. He urged deeper reforms of the global financial architecture by reducing lending risk, lowering the cost of capital and attracting more private investment.

    Surangel Whipps Jr., president of the low-lying Pacific island state of Palau, said faster progress in electrification is a “powerful weapon in our arsenal”. But he warned that the energy transition would stall without “fit for purpose investment that is fast, predictable and accessible”.

    The post EU, UK lead push for electrification as “powerful weapon” against fossil fuels appeared first on Climate Home News.

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    Mombasa: Key outcomes from the Our Ocean Conference in Kenya

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    A major ocean conference has ended in Mombasa, Kenya, with just a handful of countries committing to high-level political declarations on banning deep-sea mining, protecting climate-resilient coral reefs and combatting illegal fishing.

    The Our Ocean Conference (OOC) brought together more than 5,000 delegates to discuss marine issues and make voluntary commitments to advance ocean sustainability.

    It was the first time in the conference’s 11 editions that it had been held on African soil.

    African countries played an “important leadership role” at the talks, observers told Carbon Brief, helping to drive ambition on fisheries transparency, a precautionary pause on deep-sea mining and developing proposals for marine protected areas on the high seas.

    Across the three-day conference, attendees also made 320 separate commitments, including new funding for scientific research, improving waste-management programmes to reduce marine pollution and mapping Indigenous groups’ customary waters.

    Some of these commitments were accompanied by announcements of new funding, with a total of $6.4bn “mobilised” across all pledges.

    Several non-governmental organisations also released new reports during the conference, on topics ranging from the implementation of marine protected areas to “climate-resilient” coral reefs.

    Observers told Carbon Brief that the commitments and discussions at the conference were “positive steps”, but added that these pledges must now be backed up by action.

    During the opening ceremony, former US secretary of state John Kerry urged delegates to move “from commitments to implementation”.

    Here, Carbon Brief outlines the key takeaways from the OOC across five major climate-related topics.

    Background

    The OOC was first held in Washington DC in 2014, where it was championed by Kerry.

    The conference aims to “identify action-based solutions and make tangible commitments” towards addressing key issues facing the ocean, such as climate change and overfishing. It does so through voluntary commitments made by governments, non-governmental organisations, civil society groups and others.

    These commitments align with the six “pillars” of the conference:

    • The ocean-climate nexus
    • Marine pollution
    • Marine protected areas
    • Maritime security
    • Sustainable blue economy
    • Sustainable fisheries

    Since then, the conference has been held annually (with the exceptions of 2020 and 2021 during the Covid pandemic), with the host city changing every year.

    Each edition of the conference is very different, attendees told Carbon Brief, and the host country plays a large role in setting the conference’s priorities.

    For example, at the 2024 conference, held in Athens, Greece, shipping and sustainable tourism were discussed at length alongside the six existing pillars.

    At this year’s summit, extra attention was paid to the roles of local communities in achieving a “healthy” ocean.

    Since 2025, the conference has had its own dedicated secretariat, hosted at the research organisation, the World Resources Institute (WRI). (Prior to that, the US Department of State acted as the de-facto secretariat.) 

    Marine protected area, Torre del Cerrano, Pineto, Italy.
    Marine protected area, Torre del Cerrano, Pineto, Italy. Credit: Fabrizio Troiani / Alamy Stock Photo

    Conference participants told Carbon Brief that the OOC has been “highly successful” in achieving its aims over the past decade. 

    An analysis of the first 10 years of the conference, published by WRI in 2025, found that of a total 2,618 commitments made at the OOC, around 1,130 had been completed and a further 1,005 were in progress.

    In Mombasa this year, 104 countries and organisations made a total of 320 voluntary commitments. More than one-quarter of these commitments were made in the “sustainable blue economy” action area.

    According to the preliminary report released by the secretariat at the conclusion of the OOC, the commitments made at the conference represent $6.4bn in “mobilised” finance. However, it is unclear from the report how much of this figure is new committed funding.

    Back to top

    Marine protected areas

    Marine protected areas (MPAs) are one of the six key action areas of the Our Ocean Conference.

    A June 2026 independent assessment of the MPA-related commitments at previous editions of the OOC found that the conference has “made an outsized contribution to global marine conservation efforts”.

    According to the analysis, more than one-third of the Earth’s MPAs stemmed from announcements made at the OOC – a total area of more than 10m square kilometres (km2).

    This progress is the result of nearly two-thirds of MPA-related OOC commitments already fully implemented, the assessment says, while most of the remaining commitments “show evidence of progress”.

    If all pledged MPAs were to be implemented, it would represent protection for around 14.4m km2 or 4% of the ocean.

    The chart below shows the number of pledged actions related to MPAs and other area-based conservation methods that were pledged at the OOC between 2014 and 2025, coloured by the progress made on each commitment.

    Map of marine protected areas around the world
    Degree of completion of MPA commitments made at the OOC between 2014 and 2025. Blue indicates evidence of completion, while yellow shows some evidence of progress and red shows no evidence of progress. Source: Sullivan-Stack et al. (2026)

    Several groups announced new MPAs – or the completion of previously announced MPA designations – at the OOC.

    These included the establishment this year of two new MPAs in the Juan Fernández region of Chile, protecting a total of around 337,000km2 of ocean, and the approval of the Azores Marine Park, which will span 287,000km2 – making it the largest network of protected areas in the north Atlantic Ocean.

    However, despite the progress made in designating MPAs, further work is needed to ensure that these areas are truly protected, experts told Carbon Brief in Mombasa.

    A report released by the Smithsonian Tropical Research Institute (STRI) at the summit detailed the “implementation gap” facing MPAs. It noted that “at least half of existing MPAs remain unimplemented or operationally ineffective”, while just 3.5% of the global ocean is “fully and highly” protected.

    Closing this gap will require “inclusive, sustained and context-sensitive design, management and funding approaches”, continued the report.

    Dr Ana Spalding, the director of STRI’s Adrienne Arsht community-based resilience solutions initiative, told Carbon Brief that, while MPAs are typically evaluated based on their biodiversity outcomes, the communities that rely on ocean ecosystems are also very important to consider. Focusing on just one aspect or the other will result in an MPA that is not effective, she added:

    “There’s going to be a sweet spot between the two.”

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    High Seas Treaty

    The Agreement on the Conservation and Sustainable Use of Marine Biological Diversity of Areas Beyond National Jurisdiction – also known as the BBNJ Agreement or the High Seas Treaty – entered into force on 17 January 2026.

    This followed the treaty, achieving the necessary 60 state ratifications on 19 September 2025. The week before the OOC, the east African nation of Comoros became the 90th party to ratify the agreement.

    The first Conference of the Parties for the High Seas Treaty will be held in January 2027 in New York City. At that meeting, parties will be tasked with creating the rules of procedure, establishing the subsidiary bodies and carrying out other foundational work.

    Because so many key decisions will be made at this COP1, it is “imperative” to have as many ratifications as possible before the conference begins, said Rebecca Hubbard, director of the High Seas Alliance, a coalition of non-governmental organisations that advocates for protection of the high seas. She added:

    “We hope that well over 100 countries will be party to the agreement by COP1, so that they can be at the decision-making table.”

    Container ship in the Indian Ocean. Image ID:
    Container ship in the Indian Ocean. Credit: imageBROKER.com / Alamy Stock Photo

    One of the key provisions of the High Seas Treaty is that it creates a mechanism for countries to establish MPAs in international waters. This will be key to achieving the “30 by 30” target of protecting 30% of the world’s land and oceans by 2030, Hubbard told Carbon Brief.

    However, establishing a high-seas MPA under the agreement requires a thorough process, including a review by a scientific and technical subsidiary body, a consultation with parties and a vote by the COP. Thus, in order to achieve the “30 by 30” target, parties will need to act swiftly to begin the process of establishing high-seas MPAs, according to Hubbard. She said:

    “It will be very, very tight. It’s definitely possible, but it requires really strong government leadership and prioritisation.”

    She added that it is “essential” that governments begin forming proposals for high-seas MPAs before the COP meets in January, noting that some countries are already doing so.

    At a side event on 16 June, representatives from South Africa and the EU detailed plans to propose a high-seas MPA that would link two existing protected areas in the sub-Antarctic – one South African and one French. Hubbard told Carbon Brief:

    “That’s a really great example of what we can do with the High Seas Treaty – having developed and developing countries working together, sharing knowledge [and] developing scientific approaches together. I think that’s the hopeful future, collaboration [and] cooperation, that the High Seas Treaty really provides.”

    Also at the summit, Senegal, Mauritania, the Gambia and Guinea-Bissau committed to creating “at least two” transboundary west African MPAs.

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    Deep-sea mining

    Although deep-sea mining was not a major focus of the Mombasa talks, it did feature at several side events.

    At a reception held by the Deep Sea Conservation Coalition (DSCC), Prof Rashid Sumaila of the University of British Columbia said the “wrong question is being asked” about deep-sea mining. He continued:

    “It’s not whether they have the minerals, it’s whether extracting them gives a net-positive impact.”

    Sumaila added that evaluating the risk of deep-sea mining will require a cost-benefit analysis that is as “broad and inclusive as possible”.

    At the same reception, the foreign-affairs minister of Malawi, Dr George Chaponda, announced the country’s support of a “precautionary pause” on seabed mining in international waters. This would prohibit mineral exploration in such areas until there is robust scientific evidence showing limited environmental harm.

    In doing so, Malawi became the first African country to support such a pause – and the 41st country overall to support a precautionary pause or moratorium on the activity.

    Chaponda told the assembled guests that Malawi’s existence as a landlocked country did not preclude its involvement in the deep-sea debates, urging:

    “To my fellow landlocked states: geography does not diminish our stake in the ocean.”

    Later in the week, Kenya and Madagascar also announced their support for such a pause.

    In a statement, David Willima, the Africa lead at DSCC, said:

    “The leadership shown by Malawi, Kenya and Madagascar sends a vital signal that African nations are stepping forward to defend the deep ocean and are unwilling to accept the risks of deep-sea mining.”

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    Coral reefs

    At the third UN Ocean Conference (UNOC), held in Nice, France, in June 2025, 11 countries and several partner organisations launched the high-level commitment to protect “climate-resilient” coral reefs.

    These are reefs that, according to scientists, have the “best chance of long-term survival in the face of climate change”.

    (UNOC occurs every three years and is specifically focused on achieving the UN Sustainable Development Goal on sustainable ocean use. Unlike the OOC, UNOC results in a negotiated political declaration.)

    A further four countries signed the commitment in Mombasa: Comoros, the Dominican Republic, Kenya and the UK. According to a representative at the launch event, the goal is to reach 31 signatories – representing 80% of the world’s coral cover – by COP31 in Turkey in November this year.

    Signatory governments pledged their commitment to:

    • Identifying climate-resilient reefs and prioritising their protection.
    • Integrating coral-reef protection into national strategies and plans.
    • Enacting policies to reduce the local pressures facing coral reefs, such as overfishing, pollution and overdevelopment.
    • Implementing national reef monitoring programmes and action plans.
    • Ensuring equity and working with local communities in protecting reefs.

    The Mombasa conference also coincided with the presentation of a new study on climate-resilient reefs, covered in the 17 June edition of Carbon Brief’s Cropped newsletter. (The study is currently in the final stages of peer review.)

    Coral reef in Raja Ampat, Indonesia. Credit: Noemi Merz / Ocean Image Bank
    Coral reef in Raja Ampat, Indonesia. Credit: Noemi Merz / Ocean Image Bank

    Building on a 2018 project that identified the 50 coral reefs that “form an optimal portfolio of reefs that are most likely to survive climate change”, the new work mapped more than 165,000km2 of coral reefs across 70 countries. These were found to have the best chances of persisting in the face of climate change and a warming, acidifying ocean.

    Dr Emily Darling, director of coral-reef conservation at the Wildlife Conservation Society and a co-author of the study, told Carbon Brief that “one of the key things countries can do that have these important reefs is elevate them into national policy” across multiple government sectors.

    She added that learning from these reefs will become vital over the coming months as El Niño warms the world’s oceans even further.

    Darling told Carbon Brief:

    “Climate change is not a single blanket on the world’s oceans. There are a lot of pockets of resilience, there are pockets of revolution for corals, and it’s all about finding those places, and how do we support them through the other local pressures that they experience that we know we can manage.”

    Although few monetary coral-related commitments were made at the summit, Norway pledged to allocate NOK 20m ($2m) to the Global Fund for Coral Reefs.

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    Fisheries

    One of the major achievements of the summit was the adoption of the Mombasa Declaration to advance fisheries transparency and combat illegal fishing.

    The declaration “recognise[s]” that illegal, unreported and unregulated (IUU) fishing is a major factor driving the unsustainable use of ocean resources and the degradation of marine ecosystems.

    We celebrate growing global momentum toward achieving sustainable ocean management by 2030. Yet we remain deeply concerned about the threats of overfishing, ecosystem degradation, declining biodiversity, and maritime insecurity. We recognize that these issues are enabled by Illegal, Unreported and Unregulated (IUU) fishing and associated human rights abuses. We highlight that opacity in parts of the global seafood sector undermines efforts to combat IUU fishing and associated abuses, and therefore regard increased fisheries transparency as a critical response. Transparency in ownership structures is especially important to ensure that the ultimate beneficial owners responsible for IUU fishing activities are identified and held accountable.
    Excerpt from the preamble to the Mombasa Declaration. Source: The Mombasa Declaration (2026)

    The declaration, which was signed by 16 national governments – eight of them from Africa – commits parties to follow a set of principles laid out in the Global Charter for Fisheries Transparency. This was developed and promoted by a group of civil society organisations known as the Coalition for Fisheries Transparency.

    The commitments in the Mombasa Declaration fall within four broad categories:

    • Supporting transparency and accountability in the fishing industry.
    • Strengthening monitoring of fishing activities and cooperating with enforcement actions.
    • Building capacity and supporting implementation of transparency reforms.
    • Strengthening ocean-observing systems and promoting the use of open-access data.

    The declaration notes that these principles should “apply to and benefit both small-scale and industrial fisheries” and support “broader ocean-management efforts”.

    At a press conference announcing the launch of the declaration, Ghanaian fisheries and aquaculture minister Emelia Arthur called it a “global testament of our collective commitment to transparent fisheries”. She emphasised the importance of the sector to all aspects of life, saying:

    “Fisheries is nutrition. Fisheries is food security. Fisheries is livelihoods. Fisheries is national security.”

    Fishing boat and gannets, Cornwall, UK.
    Fishing boat and gannets, Cornwall, UK. Credit: David Chapman / Alamy Stock Photo

    Several civil society organisations, philanthropies, community groups and governments also made separate fisheries-related commitments at the summit.

    The EU committed €46m ($52m) through its Horizon Europe research programme to fisheries work, including €32m ($36m) for “adaptive co-management strategies” and €14m ($16m) for research on conservation and sustainable management of migratory fishes.

    The EU and Italy both also announced contributions to the European Maritime, Fisheries and Aquaculture Fund.

    The government of Kenya made nine fisheries-related pledges at the summit, including committing to train compliance officers dedicated to combatting IUU fishing, developing management plans for all of its commercial fisheries and establishing bycatch mitigation measures.

    At the summit, the UN Food and Agriculture Organization launched its biannual “state of world fisheries and aquaculture” report.

    According to the report, the world set a new record for fisheries and aquaculture in 2024 – producing a total of 235m tonnes of fish and algae. This total consisted of nearly 92m tonnes of fish from capture fisheries, 103m tonnes of farmed fish and 40m tonnes of algae production.

    Aerial view of a fish farm.
    Aerial view of a fish farm. Credit: Scharfsinn / Alamy Stock Photo

    The amount of fish produced by capture fisheries has remained largely stable since 2000, while aquaculture production has increased by an average annual percentage rate of just under 5%, according to the report.

    While the largest growth has occurred in Africa, Latin America and the Caribbean, the vast majority of aquaculture production – 89% – occurs in Asia.

    The report also says that more than one-third of the world’s marine fish stocks are overfished, with significant variation based on region and species. It adds that climate change may play an increasing role in driving the unsustainability of fisheries in the future:

    “Despite the uncertainty of climate risks in the short, medium and long term, studies on the impacts of climate change on aquatic food systems around the world increasingly document the relevance and potential success of adaptation measures, urging decision-makers to integrate climate change considerations into fisheries and aquaculture planning and management.”

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    The post Mombasa: Key outcomes from the Our Ocean Conference in Kenya appeared first on Carbon Brief.

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    Climate Change

    Did Colombia’s energy transition just come to a halt?

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    Christopher Wright is the principal analyst at CarbonBridge, a decarbonisation consulting firm.

    Less than two months ago, Colombia hosted the world’s first international conference on Transitioning Away from Fossil Fuels. This weekend, however, it appears that Colombia’s first ever leftist presidency has ended. Far-right candidate Abelardo de la Espriella, who was last week strongly endorsed by Donald Trump, will not only take the reins of government but also steer the future of Colombia’s energy transition.

    As the world’s sixth-largest coal exporter, and fourth largest oil exporter in Latin America, Colombia plays a critical role in the world’s energy markets. However, this role had shrunk under President Gustavo Petro’s administration, as it sought to proactively shift the country away from its fossil-fuel based economy, ahead of a potential oil and gas production shortage over the next decade.

    That could all change as De la Espriella’s takes power. Calling himself the Tiger (“El Tigre”), he has promised to focus on deregulation, exploit oil extraction “to the maximum” and leverage the energy sector as a key “engine of growth”.

    Colombia’s world-leading energy transition

    Over the last four years, Colombia has embarked on one of the most rapid and holistic energy transitions anywhere in the world. Shortly after coming to power in 2022, the government of Gustavo Petro halted new oil and gas exploration contracts, suspended all hydraulic fracking pilots, and pledged to end the development of new unabated coal power plants.

    While many of these moves faced domestic and legislative challenges, they were widely praised in climate circles around the world.

    Colombia soon became a pivotal member of the Powering Past Coal Alliance, the Beyond Oil and Gas Alliance and the Fossil Fuel Non-Proliferation Alliance. It then went on to host the biodiversity COP in 2024, launch a $40-billion climate transition investment portfolio, and famously, host the Santa Marta conference earlier this year.

    While fossil fuels still comprise around 7% of Colombia’s GDP and 56% of its total exports, there were already signs that the transition policies had begun to have an effect.

    Coal production last year fell to its lowest level in the last 22 years. According to the Colombian national association of coal producers, coal export volumes declined by 23% in 2025. While the oil sector has not seen an equivalent precipitous drop, production levels have remained historically low since COVID.

    What about its domestic electricity sector?

    Since the 1970s Colombia’s electricity sector has been dominated by large hydro-electric dams, endowing it with some of the lowest carbon electrons anywhere in the world. Today, close to 70% of its electricity supply comes from these large dams.

    However, electricity demand rose by close to 10% under the Petro government. To meet this demand, total installed electricity capacity has expanded by a similar figure, and solar power has made up over 70% of new electricity capacity since.

    As a result, by the end of 2025, gas power generation in the electricity sector had hit its lowest point since 2018. Wind power had doubled, and solar power generation had risen by over 630%. Colombia’s renewable energy association predicts that, by the end of 2026, the country may be home to more than 4.2 GW of installed variable renewable energy capacity.

    Far-right jumps on energy challenges

    Despite the progress, the last three years have been an incredibly challenging period for Colombia’s energy sector.

    During Petro’s first two years in office, inflation remained above 10%, and interest rates stayed above 13% for most of 2023. This put a pause on new energy investments, as foreign direct investment fell by a third since 2022.

    On top of this, Colombia suffered through an El Niño-fuelled drought in 2023-24, crippling its hydro-electric power supply. This forced the country to turn to expensive gas and coal power, just as both sectors had effectively begun to pull back. This sent electricity prices through the roof, increasing nearly 40% in a single year, and led the Petro government to intervene with price controls, aiming to protect everyday Colombians.

      Unsurprisingly, this made energy investors even more cautious. By the end of 2023, GDP growth had plummeted and renewable energy investments fell by 70%. Since then, all the major credit agencies have downgraded the country’s credit rating, making it even shakier to invest.

      As a result, even with the new solar coming online, and 1.2 GW of additional hydro-power from the Ituango dam expected by 2028, the country could still face a major energy deficit by 2027, with permitting delays halting project developments, and 5.1 GW of approved projects unable to reach financial close.

      Challenging domestic debate

      This has led to a challenging domestic debate on energy policy. While 96% of Colombians want to see solar expand further, they have been understandably frustrated by high electricity bills and limited economic growth.

      As a result, De la Espriella’s campaign, which has largely focused on taking a hardline stance to combat growing concerns around security and crime, was relatively open to solar power, but sought to blame Colombia’s current energy crisis on the speed of its current energy transition.

      Branding himself as neither a climate denialist nor “dogmatic environmentalist” the incoming president who will take office in August, will likely seek to revoke the ban on new hydrocarbon exploration contracts, legalise fracking and restructure the national oil company, Ecopetrol.

      While he is unlikely to cancel market-driven projects and may reduce regulatory hold-ups, it is also likely that he will shift away from the government’s recent overwhelming support for long-renewable energy and battery storage projects, which have driven much of the recent uptake in solar power.

      Future of energy transition in doubt

      In a country of close to 54 million people, the final election count was only decided by about 250,000 votes. However, this weekend’s margin belies the magnitude of the shift that will likely now take place.

      With the country facing a potential domestic energy shortage 2027, President-elect De la Espriella has promised to revitalise the hydrocarbon economy, shifting Colombia’s recent energy transition on an entirely new course.

      While this may unlock some regulatory challenges hindering renewables roll-out, broader support mechanisms for solar projects will likely be dismantled, and the broader economic transition abandoned, along with its recent flurry of international climate alliances.

      He will also take his place among a wave of right-leaning Presidents that have swept to power across the continent in the last 18 months. This has seen right-wing electoral victories across Ecuador, Bolivia, Chile, Costa Rica, Argentina and now Colombia, with Peru’s Keiko Fujimori potentially joining the club soon – pending a final vote count.

      With the Brazilian elections scheduled for October, and run-off scenarios between Lula and Flávio Bolsonaro still far too close to call, 2026 will undoubtedly be a pivotal year for Latin America’s energy future.

      The post Did Colombia’s energy transition just come to a halt? appeared first on Climate Home News.

      Did Colombia’s energy transition just come to a halt?

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