The “dangerous humid heat” that engulfed western Africa in mid-February was made 10 times more likely by human-caused climate change, a new rapid attribution study finds.
Throughout February, western Africa was hit by unusually intense heat. Temperatures exceeded 40C in some regions, prompting the Ghanaian and Nigerian meteorological services to issue heat warnings.
The World Weather Attribution (WWA) service have analysed the region’s “heat index” – a measure that incorporates both temperature and humidity, to reflect the physiological impacts of the extreme conditions.
While the average air temperatures in west Africa reached 36C over 11-15 February, the heat index for the same period was about 50C, according to the study.
The study authors find that climate change made the heatwave 10 times more likely and 4C hotter. They warn that if global warming reaches 2C above pre-industrial temperatures, “similar events will occur about once every two years and will become a further 1.2-3.4C hotter”.
There was “very limited” data available on the impacts of this heatwave across west Africa, the study notes. However, the authors told a press briefing that heat is a “silent killer” and that lack of reported impacts does not mean the heatwave was not dangerous.
The report says that “to reduce heat-related morbidity and mortality in southern west Africa, there is an urgent need for improved monitoring and research on the impacts and risks associated with heat waves”.
Early heatwave
Countries across west Africa have been sweltering under unseasonably hot temperatures for weeks.
Wasiu Adeniyi Ibrahim is a meteorologist from the Nigerian Meteorological Agency and a co-author on the study. He told a press briefing that in west Africa, the most severe hot and humid weather of the year is usually recorded during March and April.
However, by February this year, the region was already reporting record-breaking temperatures. This intense heat was driven by an “anomalous high-pressure system over the Sahara region” which “carried hot air towards the coast”, Ibrahim explained.
On 7 February, the Ghanaian capital city of Accra recorded its hottest day in history when temperatures reached 38C.
The finals of the Africa Cup of Nations football tournament were played in Ivory Coast on 11 February. This year, for the first time, the Confederation of African Football included two-minute cooling breaks at the 30th and 75th minutes, with provisions for additional breaks under extreme heat.
The Nigerian Meteorological Agency issued a warning on 13 February after air temperatures hit 41C in the north of the country, stating that the heat could cause conditions including fainting, heat rash, “weakness of the body” and respiratory issues. The agency advised people to stay hydrated, seek shade and stay indoors as much as possible between midday and 4pm.
“Experts warn that the extreme temperatures, amid the epileptic power supply, could trigger diseases, threaten livestock, and lead to death,” the Nigerian newspaper Punch said, reporting on the heat warning.
The WWA adds that, across Nigeria, “doctors reported an increase in patients presenting for heat-related illness” and “people complained of poor sleep due to hot nights”.
The Ghanaian Meteorological Agency released an “urgent public service announcement” on 20 February, advising precautionary measures such as staying hydrated and avoiding direct sun exposure.
As the month progressed, hundreds of regional and national temperature records across the region were broken, including hottest February nights in Ghana, Benin and Togo.
‘Dangerous humid heat’
Extreme heat is particularly dangerous when combined with high humidity. When it is hot, the human body produces sweat to cool itself down. However, as humidity increases, sweating becomes less effective.
To assess the severity of the hot and humid conditions, the study authors analysed the “heat index”. This measure “combines temperature and humidity to reflect how it feels to the human body”, Dr Izidine Pinto – a researcher at the Royal Netherlands Meteorological Institute and co-author on the study – explained to a press briefing.
The study says:
“While the average air temperature in west Africa was above 36C, the heat index for the same period was about 50C, reflecting how a combination of humidity and high temperatures caused dangerous conditions.”
The authors focus on a region of southern west Africa where the heat was the most extreme, including Nigeria, Benin, Togo, Ghana, Ivory Coast, Liberia, Sierra Leone, and small parts of Guinea and Cameroon.
The maps below show the five-day heat index over this region averaged over 11-15 February (left), where purple indicates hotter temperatures, and the difference compared to the 1991-2020 average (right), where red indicates hotter temperatures. The blue boxes in both maps indicate the study region.
Pinto told the press briefing that as there was no meteorological station data available for many of the countries in the study region, the researchers had to “wait for the gridded datasets to be updated and validated for the region” before conducting their analysis. This delayed the release of the study findings, he said.
To put the heatwave into its historical context and determine how unlikely it was, the authors analyse a timeseries of annual maximum five-day heat index over the study region, shown below. Higher bars with darker colours indicate a higher heat index.
The authors find that in today’s climate, this heatwave was a one-in-10 year event.
Attribution
Attribution is a fast-growing field of climate science that aims to identify the “fingerprint” of climate change on extreme-weather events, such as heatwaves and droughts. To conduct attribution studies, scientists use models to compare the world as it is today to a “counterfactual” world without human-caused climate change.
They can also use these models to assess how much more intense or frequent the event would be in an even warmer world.
In this study, the authors investigate the impact of climate change on the maximum five-day heat index in southern west Africa.
They find that global warming made the west African heatwave 4C hotter. They add that if global warming reaches 2C above pre-industrial temperatures, similar events could become a further 1.3-3.4C hotter.
The authors also calculate that climate change made the heatwave 10 times more likely to occur, adding that similar events could occur every other year in a 2C world.
The graphic below illustrates these results. a pink dot indicates the number of years in every 100 that an event like the February heatwave over southern West Africa would be seen at different warming levels.
The square on the left shows a world without climate change, in which such a heatwave would happen less than once every 100 years. The middle square shows that in today’s climate, the heatwave is a one-in-10 year event. And the square on the right shows that in a 2C world, a heatwave of this severity could be expected every other year.
(These findings are yet to be published in a peer-reviewed journal. However, the methods used in the analysis have been published in previous attribution studies.)
Under-reported
West Africa was not the only region to experience record-breaking heat in February 2024.
February 2024 was the world’s hottest February on record, and countries across southern Africa – including Botswana, Namibia, Mozambique, South Africa, Zambia and Zimbabwe – saw temperatures of 4-5C above the February average.
Africa’s record-breaking heat continued into March.
In Johannesburg, South Africa’s largest city, many residents faced several weeks without water. “Authorities in Johannesburg, South Africa’s commercial hub, have blamed the ongoing heatwave for the lack of water in some parts of the city for several weeks,” Daily News reported on 13 March.
On 18 March, the health and education ministries of South Sudan closed its schools, after weather services projected an extreme two-week heatwave with temperatures of up to 45C. Parents were advised to keep all children indoors, and ministries warned that any school found open during the warning period would have its registration withdrawn.
BBC News added:
“Muslims, who make up around 6.2% of the country’s population, have been hit especially hard as many are observing Ramadan – a month of fasting. They are therefore not permitted to drink water or any other liquids to stay hydrated during the day.”
Between March 18-19, at least five countries in Africa, including South Africa and South Sudan, reported record-breaking temperatures.
However, the WWA study says that while the heatwave “potentially affected millions”, there is “very limited” data available about its impacts. As such, it says that very few heat-related impacts were reported by the media and government organisations.
“This, of course, does not mean there are no impacts”, said Maja Vahlberg from the Red Cross Red Crescent Climate Centre, who is a co-author on the study.
In fact, Vahlberg told a press briefing that early-season heatwaves are generally “more impactful than heat waves in the hot season” because “the human body has to very rapidly adjust to extreme temperatures”.
Heatwaves are a “silent killer”, Pinto told the press briefing, warning that “you only see the impacts later”.
The lack of reporting on the impacts of the heatwave “reflects the need to improve awareness of dangerous heat and detection of heat impacts”, the study says.
The post Climate change made west Africa’s ‘dangerous humid heatwave’ 10 times more likely appeared first on Carbon Brief.
Climate change made west Africa’s ‘dangerous humid heatwave’ 10 times more likely
Governments are holding “critical” talks this week on a global treaty to curb plastic pollution, as some countries and activists warn that key issues – including measures to rein in soaring plastic production – are being sidelined.
Diplomats are meeting in person in Nairobi for the first time since negotiations were suspended in chaos nearly a year ago, stymied by a long-running deadlock that pits petrostates against more ambitious nations over the reach of the UN pact.
Because nearly all plastic is made from planet-heating oil, gas and coal, the sector’s trajectory will have a major influence on global efforts to cut greenhouse gas emissions.
The four-day informal gathering, which begins on Tuesday, has been billed by the chair of the talks, Chilean ambassador Julio Cordano, as a “brainstorming” session in which countries are invited to put forward possible solutions to some of the treaty negotiations’ most divisive elements.
Cordano is expected to distill those views in a new document intended to serve as the basis for a new draft text of the future treaty, which governments would take up at the next official round of negotiations, scheduled for March 13-24, 2027.
Two earlier rounds, each billed as the final one, ended without agreement, derailed largely by a standoff over how the treaty should address plastic production, which the UN says is set to triple by 2060 without intervention.
Production curbs in the spotlight
Large fossil fuel and petrochemical producers, led by Saudi Arabia, the United States, Russia and India, have repeatedly argued that the treaty should focus only on managing plastic waste. A US State Department spokesperson told Climate Home News that Washington supports “practical, cost-effective solutions” to plastic pollution, while opposing “global plastic bans”.
A majority of countries – including most European, Latin American, African and Pacific island nations -want to limit the manufacturing of plastic to “sustainable levels”, but have not pushed for any wide-ranging ban.
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Roadmap launched to restart deadlocked UN plastics treaty talks
The chair of the negotiations proposes informal meetings through 2026 to bridge deep divisions among countries, following the collapse of talks in Geneva last year
Ahead of what it described as “critical” talks in Nairobi, the French government said last week it had already shown flexibility and “significantly scaled back” its initial ambitions. But a French official told a meeting of EU environment ministers that without an explicit reference to the “unsustainable nature” of plastic production, the treaty would be “fundamentally unbalanced, ineffective and, worse still, could set us on the wrong path for decades to come”.
In a separate written communication, the French government lamented that informal meetings held in recent months have given “disproportionate visibility to the positions of the least ambitious states”, fuelling a “risk that partial agreements may be reached only on the issues with the broadest consensus”.
Dennis Clare, a negotiator for the Pacific island nation of Micronesia, told Climate Home News that “if we fail to address any key elements”, including overproduction, the impacts of the plastic crisis on the climate, human health and ecosystems will only grow more severe.
Fears over “political calculations”
Despite such concerns, plastics production is not mentioned in the wide-ranging list of topics Cordano has drafted for the meeting – an omission that has alarmed observers.
Christina Dixon, a campaigner at the Environmental Investigation Agency (EIA), said there appeared to be an attempt to write off this crucial element of the treaty as “too complicated and politically unviable”.
David Azoulay, environmental health programme director at the Center for International Environmental Law (CIEL), said the meeting’s proposed structure was “highly concerning”. He accused the chair of “making political calculations in favour of potential short-term wins” and aiming to deliver a treaty “based on the lowest common denominator”.
Speaking to journalists last week, Cordano pushed back, insisting that “no topic is off the table” and inviting countries to bring whatever proposals they judged necessary for a successful outcome.
He added that the treaty could not be allowed to settle for just any level of ambition, and that he would not be happy with an outcome at all costs.
“This is what makes it so difficult and complex,” said Cordano, who was elected in February after his predecessor’s resignation. Countries “are trying to be creative” in finding solutions, he explained, because “the road to the objective of our work might not be so obvious”.
The post UN plastics pact talks restart amid fears production curbs will be left out appeared first on Climate Home News.
UN plastics pact talks restart amid fears production curbs will be left out
A new report from Greenpeace Australia Pacific sets out the pathway forward for Australia to be a global leader on ocean protection. With the Treaty now in force, Australia and nations around the world, have an important opportunity to drive the creation of ocean sanctuaries on the high seas, by leading with ambition, science and collaboration to ensure this landmark agreement delivers lasting protections.
The report was launched on Tuesday 23rd June at Parliament House at an event to celebrate Australia’s recent ratification and look ahead to implementation. The event was attended by Parliamentarians, Ambassadors, Departmental leaders and civil society. Thank you to everyone for celebrating with us. To ensure the Treaty is strong, fit for purpose and delivers its role of creating ocean sanctuaries on the high seas across the global ocean – multilateralism and collaboration is essential. The event hosted by Greenpeace Australia Pacific and WWF was a strong step forwards on the implementation pathway.
The Global Ocean Treaty is one of the most significant international nature agreements in history and the first focused on protecting biodiversity in the high seas. These waters cover 64% of the ocean, are home to extraordinary biodiversity, and until now, less than 1% have been fully or highly protected.
Clean power added more to global energy supplies than any other source in 2025, according to the latest Energy Institute statistical review of world energy.
Outside the Covid pandemic, it was also the first year ever in which wind and solar, when combined, contributed more new energy than any of the individual fossil fuels.
The findings illustrate the “growing prominence” of electricity in the global energy system, according to the Energy Institute, a professional membership body that took over the production of the annual statistical review from oil firm BP in 2023.
It notes that electricity demand is rising much faster, at 3% in 2025, than energy use overall at 1.7% – and that all of the new power supply came from low-carbon sources.
While it includes data on data-centre demand for the first time, the review shows that these only make up 2% of all electricity use and 15% of the increase in 2025.
(The review does not explore other sources of demand, but separate data shows electrification of industry, heat and transport is a far larger driver of growth than data centres.)
At the same time, every source of energy – including coal, oil, gas, nuclear and hydro – also reached global all-time highs in 2025, the statistical review shows.
While the 86% of “primary energy” that came from fossil fuels is a record low, their real contribution to the economy is far lower, because roughly two-thirds of their energy is lost during combustion.
Below, Carbon Brief highlights the key findings of the review in six charts.
- Global energy supplies increase 1.7% in 2025
- Fossil fuels met a record-low 86.2% of global energy supply
- The ‘primary energy fallacy’ ‘inflates fossil fuels’
- Wind and solar were biggest source of new energy in 2025
- Clean energy met all of global electricity growth in 2025
- China generates more power than the US, EU and India combined
Global energy supplies increase 1.7% in 2025
The review shows that global energy supply reached a record high in 2025, climbing 10 exajoules (EJ, 1.7%) to more than 600EJ for the first time ever.
Within this total, there were new all-time highs for every energy source: oil; coal; gas; nuclear; wind and solar; as well as hydro and other renewables. This is shown in the figure below.
Notably, coal hit a new record of 166EJ in 2025, up 0.7% from a year earlier and 2.8% above the level reached in 2014, which had been seen as a potential peak for the fuel.
Wind and solar saw the fastest growth, up by 18.3% year-on-year, as well as adding more to global supplies – in combination – than any single fuel source.
Fossil fuels met a record-low 86.2% of global energy supply
Nevertheless, on the basis of these primary energy figures, the contribution of low-carbon sources to the global energy system still looks relatively small.
The latest data shows that fossil fuels made up 86.2% of global primary energy supplies, as shown in the figure below.
The rise of nuclear power had pushed the fossil-fuel share of global energy down to 91% as long ago as 1986, before the Chernobyl disaster pulled the plug on further growth.
It is only in the past decade that clean-energy sources have started to gain more ground, as a result of the rapid expansion of wind and solar.
The ‘primary energy fallacy’ ‘inflates fossil fuels’
Crucially, however, the statistical review is based on “total energy supply” (TES), a measure of primary energy. This counts the energy stored in coal, oil, gas and nuclear fuel going into the energy system, whereas for renewables it measures the amount of electricity coming out.
Yet, most of the energy in fossil fuels is lost as waste heat during combustion.
In fact, some two-thirds of all primary energy is lost before it can be turned into useful energy that moves a car, warms a home or keeps the lights on.
This gives rise to the “primary energy fallacy”, which tends to “inflate…the perceived contribution of fossil fuels” and the difficulty of replacing them with low-carbon energy sources.
For example, the figure in the post shows that 105 units of energy went into the global transport sector – almost all of it oil – but this only generated 20 units of transport “energy services”.
In other words, less than 20% of the primary energy being used for transport actually ends up moving people or goods, while the remaining 80% was lost as waste heat.
Until 2024, the statistical review sought to address this issue by using the “substitution method” for clean-energy sources. This listed the primary energy supplied by wind and solar, for example, as the amount of fossil fuels that would have been needed to generate the same amount of electricity.
It stopped using this approach in 2025, explaining that this would reveal the higher efficiency of a clean-energy system that loses less energy during fossil-fuel combustion. It explained:
“Put simply, in future we will need to supply less energy in the form of clean electricity to undertake the same amount of work as the equivalent energy supplies from fossil fuels. Primary energy demand will decrease as the energy system increasingly electrifies and renewable electricity continues to increase its share of generation..”
Wind and solar were biggest source of new energy in 2025
With this in mind, it is all the more notable that wind and solar, in combination, were the world’s biggest source of new energy in 2025, as shown in the figure below.
Again, perhaps two-thirds of the new primary energy added by fossil fuels last year will never actually contribute useful work to the economy, because it will be lost as waste heat.
In contrast, the new energy added by wind and solar is in the form of electricity and almost all of it can be used directly to power factories, homes, appliances and electric vehicles.
Moreover, wind and solar saw the fastest growth by far, up 18% in 2025 alone. Over the past decade, they expanded fivefold, while coal, oil and gas grew by 6%, 9% and 21%, respectively.
Clean energy met all of global electricity growth in 2025
The impact of renewables is clearest in the power sector, where combined with a new record for nuclear power, they met all of the growth in global electricity demand in 2025.
This is shown in the figure below, which illustrates how fossil generation was flat last year and how wind and solar now generate more electricity than hydro or nuclear power.
The review says that wind and solar power, when combined, grew by 18% in 2025, whereas there was a small decline in coal generation balanced by a small rise for gas.
Overall, it says that global electricity generation increased by some 940 terawatt hours (TWh, 3%), roughly three times the annual demand of the UK.
Separate figures, included in the review for the first time, show that data centres used 788TWh of electricity in 2025, up 130TWh on a year earlier.
This means that data centres accounted for 2% of global electricity demand.
China generates more power than the US, EU and India combined
The Energy Institute report says that the power sector is set to play an increasingly important role, because it is growing more quickly than other parts of the global energy system.
There is also increasing political attention on the idea of using expanded clean-power supplies to rapidly electrify other parts of the economy, particularly heat and transport.
The COP31 presidency has called for countries to back a global goal for 35% of “final” energy to come from electricity by 2035, against a global average today of around 22%.
China is well ahead of the global average, with electricity making up 30% of its final energy supplies in 2025. It recently adopted a 35% by 2030 target for electrification.
One reason it has been able to do this is the huge scale of its electricity system. Indeed, China now generates more electricity than the US, EU and India combined, as shown in the figure below.
While much of the rise in China’s electricity has historically come from coal-fired generation, there was enough growth of clean-power sources to push coal down last year.
The post Six charts show how clean power was world’s largest source of new energy in 2025 appeared first on Carbon Brief.
Six charts show how clean power was world’s largest source of new energy in 2025
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