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We handpick and explain the most important stories at the intersection of climate, land, food and nature over the past fortnight.

This is an online version of Carbon Brief’s fortnightly Cropped email newsletter.
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Key developments

Global drought and heat

DRY THEN WET: A recent heatwave and months of low rainfall has led to a prolonged drought for Uganda, resulting in at least 16 deaths from hunger and significant crop losses, reported BBC News. Bastille Post Global suggested that “a developing El Niño later this year could bring heavier rainfall to parts of the region, raising the risk of flooding in areas now struggling with drought”.

FUNDING FOOD: The UN Food and Agriculture Organization (FAO) and the World Food Programme (WFP) have appealed for $200m in funding to help African nations deal with the impact of El Niño, stated Deutsche Welle. This would target 22 high-risk countries with measures, including “cash transfers, climate-resilient seeds, livestock protection and flood control.” The Guardian explained how El Niño could still “cause a severe shock to global food prices lasting into 2028”.

FARMING FEARS: Extreme weather has devastated agriculture across the world. India saw its driest June in 12 years, reported BBC News, and France has had a “double-digit production” decline, according to Le Monde. The Financial Times reported that farmers in the UK are mitigating the impacts of extreme heat by eliminating “chemicals and intensive ploughing to improve soil quality so it retains water”.

EURO FIRES: Wildfires have spread across Europe, with Spain reporting at least 12 deaths so far, according to the Guardian, and France experiencing road closures, said Reuters. Wildfire Today reported that the most extreme conditions are “across France, Spain and northern Portugal, the Alpine arc extending into northern Italy, the south of the UK and south-east Ireland”. CNN explained how “the climate crisis is driving hotter, drier weather, which is setting the stage for fiercer fire seasons”.

Endangering species

REDEFINING HARM: The Trump administration “reversed decades of longstanding environmental law protecting endangered species…opening up sensitive habitats…to drilling, mining, farming and real estate development”, reported CNN. According to the story, the change “redefines what constitutes ‘harm’” to endangered species, which historically prohibited habitat modification or degradation. Agence France-Presse reported that US environmental groups sued the Trump government over the move, arguing that it had violated “common sense, biological science and federal law”.

OPEN SEASON: Reuters reported that the change “limits the reach of the 50-year-old Endangered Species Act” (ESA), which is a “key regulatory consideration” when granting permits for “oil and gas, mining, electric transmission and ​other operations on federal lands and water”. Legal scholars told the New York Times the US government “was acting without conducting scientific research into the impact” of the change, while the National Mining Association “applauded the announcement”.

News and views

  • INTERNATIONAL WATERS: After a significant delay, the UK ratified the Biodiversity Beyond National Jurisdiction Agreement (BBNJ), also known as the High Seas Treaty. Oceanographic detailed how this will allow for “marine protected areas across international waters for the first time”, but also stressed that the “hard part” starts now. 
  • SCOPE-FREE: The world’s largest meat supplier JBS “scrapped a key climate goal” in its net-zero plan that accounts for its suppliers’ emissions, “which make up the vast bulk of the company’s environmental footprint”, reported the Financial Times. The company told the paper it was difficult to control these “indirect” emissions.
  • DEEP TROUBLE: Pacific gray whales are facing a “catastrophic die-off” as sea-ice loss threatens their food sources, said the Guardian. Separately, conservationists warned that more than half of all molluscs that “cluster around underwater vents” could face extinction from deep-sea mining, reported Reuters.
  • ETHANOL PUSHBACK: India’s new rules to promote 100% ethanol fuel and make ethanol-blended fuel mandatory at pumps “triggered a political row”, reported the Times of India. While the Indian government defended the push to automobile owners, a Hindu editorial and an Indian Express comment warned against incentivising fuels made from “water-intensive” sugarcane and rice. 
  • AMAZON ACTION: Deforestation in the Brazilian Amazon fell to its lowest level in a decade, but president Lula’s plans to “end illegal deforestation by 2030” could be hampered if he is not re-elected, reported Al Jazeera. Meanwhile, Colombia’s outgoing environment minister warned of greater environmental and climate risk under the incoming government, said the Associated Press
  • WAR WORRIES: The International Energy Agency (IEA) warned of the impact of the Iran war on Africa’s clean cooking efforts as disruption in the strait of Hormuz has stunted supplies and increased prices of liquefied petroleum gas (LPG), explained Climate Home News

Spotlight

UK ‘discards’ Congo rainforest funding

Amid worldwide cuts to aid spending, Carbon Brief explores how the UK is backtracking on funding for the Congo basin – the world’s second-largest rainforest.

The UK has abandoned projects worth tens of millions of pounds that were meant to help protect Congo rainforests and support local people.

Together, these initiatives would have made up half of the £200m that the UK pledged to support forest conservation in the Congo basin.

When it hosted COP26 in Glasgow, the UK led a new initiative to end forest loss, which included a collective pledge of “at least” $1.5bn (£1.1bn) for Congo rainforest nations by 2025.

Development minister Jenny Chapman revealed last week that, as of 2024, the UK had only provided £39.8m towards this goal.

COP pledge

At COP26, the UK – led by then prime minister Boris Johnson – launched the “Glasgow leaders’ declaration”, with a goal to “halt and reverse forest loss” by 2030.

The UK also made various regional funding pledges, including £200m for the Congo basin, £350m for tropical forests in Indonesia and “up to £300m” for the Amazon.

All of these rainforests face major forest loss. The Congo basin is the planet’s largest forested carbon sink, but its six host nations are among the poorest in the world and face significant funding barriers.

This has global ramifications. An official UK assessment warned that “degradation or collapse” of the Amazon or Congo rainforests “threaten UK national security and prosperity”.

African elephant pictured in Congo.
African elephant pictured in Congo. Credit: BIOSPHOTO / Alamy Stock Photo

Forest cuts

Following successive aid cuts introduced by both Conservative and Labour governments – tracking a global trend – the UK’s Congo funding is under threat.

The Congo basin forest action programme (CBFA) was explicitly set up to provide “roughly half” of the UK’s £200m Congo pledge.

Now, after reporting delays, the UK has slashed the CBFA as part of the Labour government’s aid cuts. Its £90m budget has been “quietly reduced by 79% to £18.8m”, according to the Times.

This is not the only Congo project that has been dropped due to aid cuts. The Congo part of the biodiverse landscapes fund – worth at least £12.3m – has closed five years early.

Official documents reveal more Congo forest funding is at risk, including the UK’s two largest remaining projects in the region. One initiative, intended to “incubate forest-friendly enterprises” in DRC, faces “reduc[ed] budgets”.

Documents also show the difficulties operating in the Congo, including “complex political economies and, in Gabon, a military coup – which “complicated matters”.

‘Breaking promises’

Damian Fleming, a senior forests director at WWF International told Carbon Brief:

“Tropical forest countries are making long-term policy and development choices in expectation that international partners will honour their commitments.”

In a parliamentary response, Chapman said that the UK had spent £39.8m towards its £200m Congo target, as of 2024.

Despite being described as the UK’s contribution to the £1.1bn-by-2025 global goal agreed at COP26, the £200m target has a deadline of 2029. Therefore, while the collective goal has been met, the UK’s contribution was relatively small.

Zac Goldsmith, a former Conservative minister who oversaw the forest targets at COP26, told Carbon Brief that, in his view, the UK has “discarded” its regional pledges:

“We have gone from being perhaps the leader on protecting nature internationally to breaking promises to countries around the world.”

The Labour government says it has met its overarching “climate finance” goals and still intends to “prioritise” the Congo rainforest.

However, civil society groups and MPs are concerned about the lack of “ring-fenced” forest funding in the UK’s new aid strategy.

Watch, read, listen

TOXIC TROUBLES: DeSmog unpacked a new report that said Northern Ireland is being turned into a “toxic” pig and poultry farming “sacrifice zone” to satiate the UK’s meat appetite.

NEED TO NOAA: Laid-off scientists from the US’s National Oceanic and Atmospheric Administration (NOAA) launched Climate.Us – an independent, public-backed version of the climate information website shut down by Trump last year.

DRY FRUIT: A Dialogue Earth long read looked at how climate change is impacting apricot harvests in the “stark, high-altitude desert” region of Ladakh, India.

READING ALOUD: A London Review of Books podcast discussed Robin Wall Kimmerer’s influential book “Braiding Sweetgrass”, weighing its compelling themes and where it veers into “scientific overreach”.

New science

  • Climate change could cause Indigenous peoples in the Amazon to lose 28-34% of their plant species and 18-23% of their associated services | Nature
  • Biodiversity in forests can act as a “buffer” against compound extreme weather events | Nature Communications
  • Zero-deforestation commitments in Indonesia’s palm oil sector have had “no additional impacts” on reducing forest loss | Proceedings of the National Academy of Sciences

In the diary

This edition of Cropped was written by Jess Milligan, Josh Gabbatiss and Aruna Chandrasekhar. Cropped is edited by Dr Giuliana Viglione. This edition was edited by Daisy Dunne. Please send tips and feedback to cropped@carbonbrief.org.

The post Cropped 15 July 2026: Uganda starves | Trump opens endangered habitats | UK cuts rainforest aid appeared first on Carbon Brief.

Cropped 15 July 2026: Uganda starves | Trump opens endangered habitats | UK cuts rainforest aid

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Climate Change

Is FOMO undermining climate diplomacy?

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Benito Müller, Anju Sharma, Jen Allan, Matthias Roesti and Luis Gomez-Echeverri.

Every November, tens of thousands of people descend on the world’s annual UN climate conference. Presidents and prime ministers, negotiators, business executives, campaigners, journalists, celebrities and lobbyists converge on one city for two frenetic weeks, all convinced they need to be there.

Everyone with a stake in climate action feels they must be present. Any suggestion of a smaller, more focused conference is quickly met with concerns about exclusion. But it is time to ask an uncomfortable question: has the fear of missing out (FOMO) become one of the biggest obstacles to effective international climate cooperation?

The story in numbers

When governments first met under the UN Framework Convention on Climate Change (UNFCCC) in the 1990s, the annual Conferences of the Parties (COPs) attracted only a few thousand participants. Even the Kyoto conference, which produced the first legally binding emissions agreement, hosted fewer than 10,000 people.

Since then, analysis by ecbi reveals a striking trend: after each major treaty COP, the participation at the next COP approximately doubled (see chart below).

Why?

Part of the answer is success. As climate change has risen up the political and economic agenda, more actors quite rightly want to engage. But our analysis reveals that a less acknowledged force is also driving the spikes in participation: FOMO.

As more heads of state attended, ministers concluded they had to be there too. As ministers arrived in greater numbers, government delegations expanded. Businesses, investors, researchers, campaigners, journalists, city leaders and philanthropies reached the same conclusion: if everyone important is going to COP, we cannot afford to stay away.

The result is a self-reinforcing cycle. The larger COP becomes, the more indispensable attendance appears, because presence signals relevance.



The negotiating community has barely grown

The headline attendance figures tell only part of the story. At COP28, more than 42,000 Party badges were issued to official national delegations. However, only 1,581 delegates had also attended the technical negotiating session in Bonn just five months earlier. Fewer than 4% of Party delegates formed the core negotiating community.

Comment: The UN climate process was built for negotiation – now it must support implementation

This core negotiating community has remained remarkably stable: across the five COPs since Paris, between roughly 1,300 and 1,600 delegates consistently attended both the June negotiating session and the annual COP.

The negotiating community has not become twenty times larger, but the COP has.

One COP, three different events

Today’s COP has, in fact, evolved into three very different events rolled into one.

The first is the formal negotiating session, where governments agree rules, guidance and decisions under the Convention and the Paris Agreement.

The second is a global political summit, where leaders announce initiatives and demonstrate political commitment.

The third is a vast climate expo, where businesses, cities, researchers, financial institutions and civil society showcase solutions, build partnerships and engage the public.

Each of them serves a valuable purpose, but the problem is that they have become bundled together by historical accident rather than institutional design.

Bigger is not always better

The consequences of “mega-COPs” are becoming increasingly difficult to ignore.

The countries most vulnerable to climate change are increasingly less able to host COPs and thus lose the ability to have their voices properly heard. Hosting a modern COP now requires enormous financial resources, extensive security operations and accommodation capacity that many countries simply do not possess. Even wealthier nations have become more reluctant to take on the burden.

Inside the venue, size creates its own inefficiencies. Climate negotiations often advance through informal conversations: a chance meeting in a corridor, a discussion over coffee, an impromptu conversation between delegates who discover common ground. Those opportunities become rarer when participants spend hours navigating enormous venues and crowded security checkpoints.

Comment: COP presidencies should focus less on climate policy, more on global politics

Observer access is constrained by overcrowding. National delegations increasingly include large numbers of non-government participants, sometimes outnumbering officials from government ministries. Meanwhile, businesses, campaigners and journalists compete with negotiators for the same space and attention.

The very scale of the event also creates a reputational problem. A gathering of 60,000 or more people inevitably creates expectations of dramatic political breakthroughs every year. Yet much of today’s climate diplomacy involves steady, technical progress. When those quieter achievements are judged against the expectations generated by a mega-event, disappointment in the UN climate change process becomes almost inevitable.

Time to unbundle

Not everything must happen in the same place at the same time. Negotiations, political leadership and implementation partnerships each deserve their own space. They should become separate events.

Routine governing body sessions, involving the roughly 5,000 participants directly engaged in the formal process, could be held in Bonn, where the UN climate secretariat is based. Political summits could be convened separately when leaders’ intervention is genuinely needed. Climate expos could continue to rotate with the COP Presidency, providing dedicated opportunities for businesses, investors, cities, researchers and civil society to showcase solutions and forge partnerships.

Such an approach would strengthen, not weaken, participation. Negotiators would benefit from a more focused and effective working environment. Host countries would face a far more manageable logistical and financial challenge. Climate-vulnerable countries would once again have a realistic opportunity to host key meetings and shape the global agenda. Businesses, investors, cities and civil society would gain greater visibility by engaging in forums designed for partnership, innovation and implementation, rather than competing with formal negotiations for space and attention.

Comment: Not another COP-out: We must rewrite the rules of the UN climate talks

Today’s mega-COPs evolved incrementally, one seemingly sensible decision at a time, until their sheer scale began to undermine many of the objectives they were intended to serve. The fear of missing out now risks becoming one of the biggest barriers to the reforms needed to make the process more effective.

The greatest fear now is not missing out on the next COP, but missing the opportunity to redesign the process so it can deliver on its ultimate purpose: tackling the climate crisis.

Benito Müller is managing director of Oxford Climate Policy and director of the European Capacity Building Initiative (ecbi).

Anju Sharma is a climate policy specialist with Oxford Climate Policy.

Jen Allan is a senior Lecturer at Cardiff University and strategic advisor at the International Institute for Sustainable Development.

Matthias Roesti is a postdoctoral researcher studying the political economy of climate change at the University of Pennsylvania’s Environmental Politics Lab.

Luis Gomez-Echeverri is a former senior staff member with UNDP and UNFCCC and currently an emeritus research scholar at the International Institute for Applied Systems Analysis, working at the intersection of climate and development.

The post Is FOMO undermining climate diplomacy? appeared first on Climate Home News.

Is FOMO undermining climate diplomacy?

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Climate Change

Factcheck: How nuclear, gas, wind and solar power are affected during heatwaves

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Heatwaves are becoming more likely and more intense due to climate change, impacting sources of power generation around the world as they work to meet increased demand.

When temperatures soared past 40C in parts of Europe in June and July 2026, nuclear reactors shuttered, gas plants’ efficiency fell, wind speeds dropped and electricity networks sagged.

Yet, while all types of electricity generation are affected variously by extreme heat, some commentators are quick to point the finger at “intermittentwind and solar, while downplaying the impact on sources such as gas or nuclear power.

Extreme heat also drives up electricity demand, as people turn on air conditioning and fridges work harder.

For example, in France, daily electricity demand rose by almost 20% during a two-week heatwave in June 2026.

This often leads to an increase in power prices, as generation strains and demand rises, putting a premium on electricity.

Below, Carbon Brief – amid a slew of misleading claims – explains how key power sources cope with extreme heat.

Nuclear

The impact of heatwaves on nuclear power generation is well documented, with a plethora of headlines often accompanying record temperatures in nations that rely on the technology.

For example, around 70% of electricity is generated by nuclear power in France, leaving it vulnerable to the impacts of heatwaves.

During the July 2026 heatwave, three of France’s 57 nuclear reactors had to shut down. Generation was reduced at another seven, causing an almost 9% dip in power production.

(This is a well-known phenomenon – France has seen reductions in nuclear generation due to heatwaves in 2003, 2006, 2015, 2018, 2019, 2022 and 2025.)

A similar story is true across various countries in Europe. Low river levels on the Danube have hit nuclear reactors in Romania, Hungary and Serbia this summer, while a Swiss nuclear reactor shuttered due to high river temperatures.

It is nuclear plants using river water to cool their reactors that are most significantly affected by heatwaves and droughts. These make up 14% of the global fleet. Around 60 of the world’s 440 river-cooled reactors are located in France, with a further seven across Europe.

Nuclear power plants use fission to generate heat, which is used to create steam. This steam spins the blades of a turbine that is connected to a generator to create electricity.

Following this process, the water is cooled to allow it to be recycled back through the system as steam again. Nuclear power plants generally use water from rivers or the sea to help cool and condense this steam.

As such, when water temperatures rise due to a heatwave, their cooling capacity is reduced and the overall efficiency of the nuclear power station is affected. Similarly, if there is less water available due to drought, they cannot be cooled as effectively.

Michael Tadrous, a researcher at McMaster University’s DeGroote School of Business in Canada, tells Carbon Brief that the “impact [of heatwaves] is real, but it is far smaller than many headlines suggest” and that the “effect [of heat] is gradual”. He adds:

“Warmer intake water makes a reactor slightly less efficient. [But] even an extreme 15C rise in cooling-water temperature would cost a large reactor only about 6% of its output.

“The real pressure point during a heatwave is usually legal rather than technical. Plants return their cooling water to the river a few degrees warmer than they drew it and the law limits how warm that water may be in order to protect aquatic life.”

Henry Preston, a spokesperson for the industry body the World Nuclear Association, adds that reactor shutdowns due to high river temperatures are “typically an automatic response to comply with regulations to protect local ecosystems, rather than a technological fault”.

He notes that in some extreme heatwaves, these regulations are waived given the “essential need for electricity and taking a proportional approach to climate risks”.

While nuclear power plants can generally return to standard operation quickly if they have been affected by high water temperatures, drought can cause a more significant impact.

Preston tells Carbon Brief:

“In contrast to high river temperatures, which can quickly return to acceptable levels once a heatwave passes, low river levels can persist for much longer, if drought conditions continue. As a result, low water levels may have a more prolonged impact on plant operations than elevated water temperatures.”

This is set to be the case in the current European drought, where multiple reactors in Hungary and Romania have shut down or reduced their output due to low water levels.

Simon Evans on Bluesky: Hungary's Paks nuclear plant is close to complete shutdown due to low water levels on the Danube

The Danube is not expected to return to normal water levels for “days or even weeks as no significant rainfall is forecast”, reported the Associated Press on 3 August 2026. It said this was “push[ing] some countries in eastern Europe to the brink of energy emergency”.

While heatwaves and drought can produce significant short-term effects, their impact on the availability of nuclear power across a full year is generally minimal.

On average, heatwaves cut annual nuclear generation by 0.6% between 2003 and 2022, according to a recent study that Tadrous co-authored.

He adds that, across the whole period studied, the only time a national nuclear fleet lost more than 1% of its nuclear power over a year to heat- and drought-related curtailments was France in 2003, which lost 1.3%.

According to an article in Forbes, for every additional degree Celsius in temperature, a nuclear power plant loses around 0.6-1% in cycle efficiency.

To minimise the impact on both energy security and costs, governments and nuclear companies are looking at a range of solutions to adapt to heatwaves.

For example, French nuclear-plant operator EDF is looking at additional cooling towers for its sites that are the most exposed to the impacts of a warming climate, reported Bloomberg recently.

Tadrous says the nuclear power industry is already adapting to heatwaves that are “more frequent and more intense”, adding:

“France’s river-cooled fleet lost 5.5 terawatt hours (TWh) of output to the 2003 heatwave. By 2022, one of the most severe heat-and-drought summers on record, losses had fallen to 0.5TWh, a reduction of roughly 90%, as utilities upgraded cooling systems, refined operating practices and scheduled maintenance around periods of extreme heat.”

There remain challenges for adapting nuclear power – and the wider electricity systems in which it sits – to heatwaves. However, Tadrous notes that this is less about “technical feasibility than of economic prioritisation and timely implementation”.

Gas

Gas power plants have a reputation for being reliable and able to switch on at any moment, sometimes referred to as “firm, dispatchable” capacity.

Yet, as a type of thermal generation, they are subject to many of the same stresses during heatwaves as nuclear power.

An article by the science advocacy organisation Union of Concerned Scientists (UCS) notes that the “purported ability of gas plants to be available at all times to generate electricity, particularly when the grid needs it most, is increasingly under scrutiny” due to heatwaves.

As a matter of physics, the efficiency of gas power plants drops as temperatures rise. At 40C, a gas-fired power station can expect its capacity to be reduced by 13% and its efficiency by 7% compared to when running at 20C, according to Electric Insights.

Dr Iain Staffell, associate professor in sustainable energy at Imperial College London, tells Carbon Brief:

“Simple gas turbines (the kind which turn on rapidly to meet peak demand) are hit harder [than solar, for example], with their power output falling by about 10% per 10C.”

(He adds that the transmission system struggles more than electricity generation during high temperature. Power line capacity can fall by up to 16% for a 10C rise in temperature, according to a report for the UK government.)

Several types of gas power plants require cooling as part of their process, including gas steam and combined cycle turbines (CCGTs). They usually rely on nearby bodies of water for this.

Additionally, as the UCS article notes, hot air has a lower density than cool air. As gas CCGTs rely on burning a mix of gas and air, this lower density means air takes up more space, leaving less room for gas.

Ultimately, this means that when the air is hot, gas power plants cannot generate as much electricity as normal.

These effects are not just theoretical. For example, across two nights in August 2020, there were rolling blackouts in California, US, as demand exceeded supply amid a heatwave.

While a number of factors contributed to the blackouts, gas plants made up around 79% of the capacity that dropped off the system on 14 August and a similar share the following day.

Amid record-breaking heat in summer 2026, gas power plants have also seen their capacity cut in the UK, France and other countries.

Simon Evans on Bluesky says: HEATWAVE HITS GAS POWER? Amid tight GB supplies, looks like gas plants cutting output due to heat?

Dr Staffell adds that gas power stations are thought of as “reliable, because of the way we use them” in the UK.

Whereas wind and solar are usually used to the maximum extent possible, he says that on average, only around 40% of the gas fleet is in use at any one time. As such, even if the efficiency of one gas power plant is affected by high temperatures, “we have a lot of slack to call on more of them to run”. He adds:

“The issue is less that they can’t deliver, but we have to pay through the nose to persuade more to turn on at critical times, adding to sky-high energy bills.”

Wind

The impact of heatwaves on wind generation is less direct than for other technologies.

However, wind speeds often drop during heatwaves, which tend to build during periods of sustained high pressure into extreme events such as “heat domes”.

Dr Staffell, explains to Carbon Brief:

“The very hottest days tend to create heat domes with very low wind speeds, which directly reduces the output that windfarms can produce. Air is also less dense the hotter it is, so it carries less energy within it, so there is a double impact on wind turbines.”

High temperatures are linked to low wind speeds across three-quarters of the globe, according to one recent study, looking at data from 1980 to 2023.

The study found that, as a result, across Australia, northern Asia and Europe, wind power decreased by an average of 30-50% during heatwaves.

This is inconsistent globally, however, with the Amazon, the Great Plains in North America and central Africa actually seeing a slight increase in wind during high temperatures.

As such, while the effect of heatwaves on wind generation is less direct than other generation technologies, it can have a significant impact.

In the UK in June 2026, wind generation fell to around 15% of the electricity mix due to low wind speeds, from an average for the month of about 30%, according to Octopus.

Low wind generation during this period was a key feature of the strain on the grid experienced during this time – in particular, as demand rose amid record-high temperatures.

On Wednesday 24 June, for example, the National Electricity System Operator (Neso) had to pay high prices to balance supply and demand. This included paying as much as £1,400 a megawatt-hour to secure around 1.7 gigawatts (GW) of imported power, nearly 20 times the average price for electricity in June 2025.

A Neso spokesperson said in a statement: “This is due to the impact of extremely high temperatures affecting Great Britain and the continent, and low wind.”

While reduced wind generation is common during a heatwave, it is not generally viewed as a concern for energy system operators. This is due to wind following well-established seasonal patterns – it generates less power in summer than in winter – as well as being complementary to other renewable technologies, such as solar.

Dr Chris Rosslowe, senior energy analyst for Europe at Ember, tells Carbon Brief:

“Power systems are less reliant on wind power in the summer months and its lower-than-average output is already expected and planned for. Heatwaves often bring still, but clear conditions, highlighting the benefit of wind and solar as a duo – poor conditions for one often mean good conditions for the other.”

As such, wind power remains one of very few technologies considered “resilient” to heatwaves by the UK government.

However, this did not stop the anti-renewables Daily Mail from attempting to blame the technology for strain on the UK grid on 24 June 2026, despite its own article acknowledging that gas plants had also been forced to cut their output by 2.5GW on the day.

Solar

Another common claim seen in the media is that solar “struggles” during heatwaves, with high temperatures pushing down the technology’s efficiency.

Yet heatwaves tend to coincide with long, cloudless days, when solar generation is reliably above average – despite the impact of high temperatures.

While hot weather does reduce the efficiency of solar cells, the effect is relatively modest – and widely understood. Each 1C of temperature rise reduces output by around 0.4-0.5%, according to a recent study.

This is in line with an evidence review for the UK government, which suggests the performance of solar panels falls by 0.2-0.5% for every degree of heat above 25C.

Generally, however, this effect is easily outweighed by high sunlight hours during hot spells. For example, across a four-day heatwave in the UK in June 2026, solar generated 484 gigawatt-hours (GWh) of electricity – a 46% increase over the same period a week earlier.

Similar generation highs were seen across Europe, amid record temperatures and dangerous heat that was pushing people towards the use of air conditioning.

Solar generated a record 52TWh across the EU in June 2026, beating the high set just the month before of 47TWh.

In fact, solar – especially when combined with battery storage – is a complementary technology to air conditioning, given their similar seasonal patterns. Over the course of the day, demand from air conditioning and generation from solar also marry up well.

Dr Rosslowe says:

“Solar, battery storage and air conditioning are a highly complementary trio of technologies during heatwaves. There’s a high overlap between solar output and demand from AC.”

For example, on the hottest day of the year so far in Great Britain (the island grid serving England, Wales and Scotland), on 26 June 2026, solar surged to 13.9GW in the middle of the afternoon, as demand also hit its highest point, as shown in the chart below.

Solar power tends to match high electricity demand during heatwaves. Half-hourly electricity demand and generation by source, gigawatt (GW). Area chart shows demand peaking around 40GW between 12pm and 2pm on 26 June 2026, with solar power supplying a major share of electricity during these peak daytime hours. Source: Neso. - (alt text generated by Google Gemini)
Generation on the 26 June in Great Britain, highlighting the match between solar power (yellow) and the demand profile for electricity (blue line). Source: Neso.

Across June 2026, homes with solar panels generated the equivalent of five hours of “free” self-supplied air conditioning, according to recent analysis.

Despite the impact of heat on solar efficiency, the technology is, therefore, well placed to bolster energy systems during heatwaves.

Indeed, as Dr Rosslowe tells Carbon Brief, solar suppresses power prices during daylight hours. But, even though it is predictable, there are still challenges around managing the dip in solar generation as the evening sets in. This is often compounded because it coincides with the usual evening increase in demand.

Dr Rosslowe explains:

“Problems arise when the sun goes down, but demand for cooling remains high. In the early evening hours, when gas power typically ramps up to replace solar, we have seen prices spike to extreme levels, made worse by high international gas prices.”

Storage

Energy storage systems are increasingly key to managing the impact of heatwaves on electricity systems.

The category of technologies is dominated by batteries, with more than 108GW of battery storage added in 2025 alone, according to the International Energy Agency.

Already, batteries have been used to take advantage of surges in solar generation during the daytime, amid high summer temperatures.

This is particularly useful to meet evening peaks in electricity demand, as well as the need for air conditioning overnight when temperatures do not fall.

In a statement, Pawel Czyzak , Europe programme director at Ember, said:

“Heatwaves will not go away – they will only get more severe in the future. Solutions that can help mitigate their impacts, such as battery storage, interconnection, demand flexibility and dynamic tariffs, should become a key part of grid planning and power market design.”

However, batteries are not without their challenges during heatwaves. Battery performance also decreases as temperatures exceed their optimal level.

Additionally, high temperatures can accelerate the degradation of components in lithium-ion batteries, which dominate the sector.

Analysis for the UK government found that prolonged operation at very high temperatures could – at least in theory – “overwhelm” the cooling systems built into batteries, “posing risks such as thermal runaway and explosions”. However, it noted that in practice, these cooling systems are “routinely” designed to handle temperatures of up to 45C.

(The analysis added that “developers and manufacturers have a strong understanding of risk to [battery storage systems] from high temperature and mitigate risks through regular maintenance, design improvements, and passive cooling strategies”.)

Other storage technologies also face challenges during heatwaves. For example, pumped hydro storage can be significantly impacted by drought.

Australia – which now has 4.3GW of large-scale battery storage capacity – saw its fleet of batteries and pumped hydro storage tested at the beginning of 2026, amid the most severe heatwave in years.

Temperatures above 40C posed “challenges” to storage technologies, reported Energy Storage News, which explained that their output and operating times were reduced by the increased need for their cooling systems to operate.

Despite these challenges, the use of battery storage is helping to spread the ability of renewables to meet electricity demand during heatwaves. For example, a combination of solar and battery energy storage “kept the lights on” in California amid a heatwave in 2024.

By storing abundant power during the day, it can be discharged during evening peaks, helping to minimise generation constraints and thereby keep power prices down.

Dr Rosslowe says:

“The extreme price spikes that we witness during heatwaves are a blaring signal for more power system flexibility. That could come from battery storage, demand response, or increased interconnection between countries or regions.”

The post Factcheck: How nuclear, gas, wind and solar power are affected during heatwaves appeared first on Carbon Brief.

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Governments weigh response to US going alone on deep-sea mining

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As governments at the UN seek ways to prevent the US from unilaterally mining the deep ocean floor for critical minerals, the latest UN seabed talks launched “long” processes that would seek to challenge Washington’s approach.

The International Seabed Authority (ISA), the UN body regulating the deep ocean floor, held annual three-week talks ending on Friday. The discussions come as the US – which is not a member country – moved forward in its unilateral deep-sea mining push, and as mining companies applying for American permits fought back a UN inquiry into their behaviour.

The Trump administration and mining frontrunners, among them Canadian firm The Metals Company (TMC), want to mine a huge area of the Pacific Ocean known as the Clarion-Clipperton Zone. Although it holds deposits of mangenese, nickel and rare earths – key for military use and clean energy components – it is also an unexplored ecosystem with thousands of unnamed species.

The meeting, held at ISA headquarters in Jamaica’s capital Kingston, ended with no immediate breakthroughs. Instead, it started long processes that seeks to hold mining firms and the US accountable, according to ocean governance expert Pradeep Singh, from the Oceano Azul Foundation.

“It shows some level of maturity as well as understanding from member states that this is a long process that requires policy discussions that might not be resolved by acting right away without considerate thought” he said.

    Countries have begun consultations on whether to request an advisory opinion from the International Tribunal for the Law of the Sea (ITLOS), which would seek to clarify the legality of the US-issued permits in the Clarion-Clipperton Zone and whether other states should recognise them.

    The ISA will also move forward with an inquiry into its contractors, including The Metals Company (TMC). The company tried to prevent this inquiry by suing the ISA at the ITLOS for allegedly acting in bad faith, an argument that the world’s top maritime court rejected.

    ISA secretary-general Letícia Carvalho said in her closing remarks that the past year “presented both significant challenges and noteworthy achievements”. Earlier in the talks, she said the agency’s role is “more important than ever” and that resources in the deep seabed are “the common heritage of humankind”.

    Advisory opinion on legality of US mining push

    Towards the end of the ISA assembly, Carvalho submitted a draft text to countries proposing they request an advisory opinion from the ITLOS, clarifying the legality of the US deep-sea mining push.

    Brazilian oceanographer Letícia Carvalho is secretary-general of the ISA (Photo: IISD ENB/Andrés Felipe Carvajal Gómez)

    The initiative proposed questions to the court, including whether international law backs the principle that the deep seafloor cannot be appropriated by any single country, and whether other governments should avoid recognising any similar effort.

    Several nations including the African group, New Zealand, Norway, France, Singapore, Jamaica and Canada argued that while they could back such a proposal, it required careful legal consideration. Some regretted that the note was not sent earlier in the talks.

    Russia and China backed the request for an advisory opinion. The Chinese delegation suggested asking whether unilateral actions by non-member states – such as the US – would break international law, and what the consequences of such actions would be.

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    By the end of the talks there was no consensus on this proposal. The assembly decided instead to hold consultations led by Malta, and decide on whether to request an advisory opinion by next year’s meeting.

    “They are not rushing into this,” Singh explained. “It also seems that they are not feeling immediately threatened at this stage, and that there are still some things that could be done to find a way forward and perhaps persuading the US from acting unilaterally.”

    Growing call for deep-sea mining moratorium

    Activists were also critical of the ISA deciding to renew one of TMC’s exploration licenses in the Clarion-Clipperton Zone, which expired last month. Haldis Helle, ocean campaigner at Greenpeace, said this was a “reward” for TMC despite “their clear disregard for international law”.

    But Singh argued that the renewal was “not an endorsement to act unilaterally” but an effort from countries to make the “whole decision-making including the inquiry process robust”, without showing signs of any bias.

    Instead, campaigners highlighted a growing call for a moratorium on deep-sea mining, which seeks to halt all activity until enough scientific evidence can show that it is not harmful for marine wildlife. The initiative is now backed by 46 governments, with Mauritius, Mozamboque and the Republic of Congo becoming the latest supporters.

    “The lesson from the past three weeks is clear: only a pause on exploitation, now backed by over a quarter of ISA member states, can deliver the legal certainty this moment demands and rein in a situation being driven out of control by a handful of reckless companies“, said Sofia Tsenikli, global campaign director at the Deep-Sea Conservation Coalition (DSCC).

    The post Governments weigh response to US going alone on deep-sea mining appeared first on Climate Home News.

    Governments weigh response to US going alone on deep-sea mining

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