Twice as many animals died due to heat stress en route to slaughterhouses during the UK’s record-hot summer in 2025 compared to 2024, according to new Carbon Brief analysis.
Government figures showed that nearly 6,600 animals – mostly chickens – died in transport as a result of the sweltering summer heat in England and Wales from June to August 2025.
This compared to 3,100 in summer 2024 and no official cases in summer 2023.
These figures were still below the more than 18,500 deaths recorded in the summer of 2022 when UK temperatures hit 40C for the first time, as previously reported by Carbon Brief.
The deaths are a “horrifying reminder of what happens when animals are treated as cargo”, said an animal-rights group spokesperson.
Detailed descriptions included in the data on the deaths highlighted thousands of animals dying amid heat stress, high humidity levels and long journeys.
Thousands of animals also died due to cold, wintry conditions, with more than 13,000 deaths recorded between December 2024 and February 2025 – almost double the previous winter.
Heat deaths
Carbon Brief has analysed recent years of “dead on arrival” data focused on livestock that died due to heat or cold stress en route to slaughterhouses.
The data was obtained through the UK Freedom of Information (FOI) Act from the Food Standards Agency (FSA), which is responsible for the compliance of slaughterhouses in England and Wales.
At least 1m chickens die in the UK each year while being transported to slaughterhouses due to suffocation, poor transport procedures and other issues, reported the Bureau of Investigative Journalism in 2018 .
Pigs, cows, sheep and other animals also die in this way in smaller numbers.
The new data showed that 6,595 animals died due to heat stress en route to abattoirs between June and August 2025, which was the warmest summer on record in the UK.
According to the Met Office, human-caused climate change made this summer heat 70 times more likely to occur.
Carbon Brief requested non-publicly accessible details of “dead on arrival cases” that were categorised as “suspected heat/cold stress”.
Each incident contained a detailed description written by a vet with supporting evidence about the condition of the animals, the transport conditions and the suspected cause of death. These are filed to the FSA.
The information showed that certain individual days had particularly high death tolls. Almost 1,000 chickens died in a number of incidents during a heatwave on 11 July 2025. Some chickens showed visible signs of heat stress, such as panting and immobility, the reports said.
On 12 August, amid more high temperatures, 2,154 chickens died in heat-stress incidents.
Body temperatures of some of the chickens that died on this day were as high as 46C.
A chicken will die if its body temperature exceeds 45C and it should ideally stay as close to 41C as possible, according to a 2005 document from the Department for Environment, Food & Rural Affairs (Defra).
The table below shows the total number of heat- and cold-related deaths of livestock in recent years, based on the data obtained through FOI.
The “dead on arrival” information covered every summer and winter since 2023, alongside the summer of 2022.
The figures were likely an underestimate of the total number of livestock deaths due to high or low temperatures, as they only included deaths with “suspected cold/heat stress” as a listed category.
However, the incident descriptions in many other deaths mentioned high and low temperatures as contributing factors, despite the ultimate cause of death not being labelled as such. These were not included in Carbon Brief’s tally.
The figures covered deaths in England and Wales. Scotland and Northern Ireland do not record the cause of deaths en route to slaughterhouses, so it is not possible to single out the cases linked to high or low temperatures.
Preventing deaths
These livestock deaths are a “horrifying reminder of what happens when animals are treated as cargo”, says Alex Harman, campaigns manager at animal rights group Animal Aid. He tells Carbon Brief:
“These 6,600 individuals [in summer 2025] did not just die, they suffered prolonged, agonising heat exhaustion inside metal containers – anyone experiencing the UK’s heatwave this week will be able to empathise.”
Climate change is “simply amplifying the violence already built into animal farming”, he says, adding that the only “compassionate, logical” solution is to “stop viewing animals as products and urgently transition to a plant-based food system”.
Pigs and chickens cannot sweat and face difficulties cooling down on very hot days.
Cramped or long journeys can exacerbate this, combined with high humidity levels, sometimes upwards of 80%, the livestock data showed.
Abigail Penny, the executive director of Animal Equality UK, tells Carbon Brief that “these same scenes of extreme animal suffering play out every summer and, if nothing is done, it’s only going to get worse”.
Workers transporting animals during extreme weather conditions are expected to put in place measures to protect them, according to UK government guidance.
These measures can include ensuring water and ventilation systems function properly on vehicles, avoiding travel during the hottest or coldest parts of the day and recognising signs of heat and cold stress in animals.
The FSA said that the number of “dead on arrival” incidents caused by cold and heat stress increased by more than 50% between April 2024 and March 2025 compared to the same period the year prior.
The FSA and Defra declined Carbon Brief’s request to comment on the new figures.
Cold deaths
Thousands of animals also die due to cold stress while travelling to slaughterhouses each year. Carbon Brief assessed data for these deaths in the winters of 2023-24 and 2024-25.
At least 13,057 livestock animals died due to cold weather conditions between December 2024 and February 2025. This is more than double the number – 6,981 – that died the previous winter.
On 6 February 2025 alone, 4,056 poultry deaths were reported due to cold weather impacts.
Some livestock also died due to cold conditions in the summer months.
For example, 326 animals died amid cold weather in the summer of 2023. No official heat-related deaths were recorded in that period, but a number of incidents referred to hot-weather conditions or heat stress as contributing factors.
Overall, 2023 was a very warm year in the UK, with soaring temperatures in June and September. At least 3,103 animals died from heat stress in September, the figures also showed.
Conditions were cooler and wetter in July and August, which may have contributed to the absence of heat-stress deaths.
Most cold deaths during warmer months occurred in the early hours of the morning or overnight when temperatures dropped, the FOI data shows.
On 28 August 2025, for example, 134 chickens died due to cold stress. The incident description outlined that the animals were “very wet”, dirty and had few feathers, which can reduce a chicken’s ability to hold warmth.
The animals were transported overnight to a slaughterhouse and “suffered distress and pain” because of the weather and other factors, the description noted.
The post Livestock heat deaths in transit doubled in UK record-hot summer of 2025 appeared first on Carbon Brief.
Livestock heat deaths in transit doubled in UK record-hot summer of 2025
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Prepared by a coalition of nine Western Australian union, industry, conservation, and community organisations—including UnionsWA, the Conservation Council WA, and the Smart Energy Council—the WA Clean Energy, Jobs & Industry Plan provides a practical roadmap to transform Western Australia into a clean energy powerhouse while creating thousands of secure local jobs.
Western Australia stands at a pivotal crossroads: lead the global clean energy economy or watch investment, future industries, and secure jobs go elsewhere. The WA Clean Energy, Jobs & Industry Plan outlines a transformative blueprint to harness the state’s world-class solar and wind resources. Discover how legislated renewable targets, green iron manufacturing, and a dedicated regional training strategy can generate tens of thousands of local jobs, lower household bills, and build a resilient, net-zero future for all Western Australians.
WA needs a clear and forward-thinking plan if it is going to become a competitive renewable energy powerhouse and maintain its economic strength through the energy transition.
“Western Australians know a faster renewable energy transition will lower their household expenses and prevent harmful climate pollution. But the community also needs clear direction to ensure this transition will create jobs, lower costs and not cause undue environmental harm.
“Here, sectors representing a broad range of interests have laid the groundwork for those outcomes, clearly outlining what is needed to create a future for WA that is good for the environment, for the climate, for workers and for the economy.
Summary
The WA Clean Energy, Jobs & Industry Plan sets out a strategic roadmap to position Western Australia as a global clean energy superpower while creating thousands of secure local jobs.
The report establishes three overarching goals:
- Creating local employment.
- Maintaining industrial competitiveness.
- Lowering household energy costs
To realize this vision, the framework details actionable measures to follow on from the recent WA Government announcement of a 75% Renewable Energy Target by 2031 for the South West Interconnected System. This includes developing a statewide Renewable Energy Target, coordinating statewide workforce and training pipelines, strategically planning regional infrastructure to safeguard high-value biodiversity and cultural heritage, and ensuring equitable benefit-sharing through household electrification incentives and First Nations equity partnerships. Ultimately, the plan highlights that establishing clear policy and regulatory certainty will unlock lower energy bills, boost power reliability, and secure the state’s global competitiveness in emerging green commodity export markets.
Key Findings
- Statewide Renewable Energy Target and Emissions Reduction Targets: The report calls for a statewide RET and 1.5°C aligned emission reduction targets to remove policy risk, lower capital costs, and attract clean energy investment.
- Transformative Job Creation: Accelerating the transition offers massive employment prospects, including up to 8,800 solar and battery jobs by 2050, as well as 24,000 ongoing and 11,000 construction jobs in a commercial green iron industry.
- Industrial Electrification & Competitiveness: Requiring large gas users to adopt binding electrification timetables and providing concessional financing will protect existing energy-intensive manufacturers from rising energy costs and impending domestic gas shortfalls.
- Green Commodity Export Leadership: Western Australia can build new export markets in green iron, green ammonia, and offshore oil/gas decommissioning by constructing shared common-user infrastructure and setting dedicated Green Commodity Export Targets.
- Coordinated Workforce & Training Pipeline: To address critical skill shortages the plan recommends establishing a WA Clean Energy Jobs Plan 2050, three regional training hubs, and dedicated pathways for female and under-represented apprentices.
- Environmental Safeguards & Community Benefits: Fast-tracked development must be paired with State Planning Policies that avoid high-biodiversity and cultural heritage lands, mandate new data centres to run on additional renewable power, and deliver household electrification rebates and First Nations equity partnerships.
What you can do
WA has an opportunity to lead on sustainable, clean energy and associated industries. You can help by:
- Sending an email to Environment Minister Murray Watt and Prime Minister Anthony Albanese, calling on them to reject Browse.
- Sharing this story to help more Australians understand what’s at stake.
- Encouraging your friends and family to take action.