Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
This week
Record temperatures
RECORD LEVELS: The Copernicus Climate Change Service has warned that extreme weather across the globe is set to continue, following April marking the 11th month in a row where global average temperatures were at record highs, reported the Financial Times. April was 0.67C above the 1991-2020 average for the month and 1.58C above pre-industrial levels, it added.
SURGING SEA TEMPERATURES: Analysis of the Copernicus data by BBC News found that the world’s oceans have broken temperature records every single day over the past year and, on some days, this has been by a “huge margin”. In February and March 2024, sea surface temperatures reached a new global average daily high of 21.09C, according to the analysis.
Climate scientists speak out
PAST 1.5C: A survey by the Guardian has found that the majority of the world’s leading climate scientists expect global temperature to rise to at least 2.5C above pre-industrial levels by 2100, given the current level of action by countries. The survey of 380 Intergovernmental Panel on Climate Change (IPCC) scientists found that almost half anticipate 3C of warming, while only 6% thought the internationally agreed 1.5C limit will be met.
EXHAUSTED EXPERTS: In an accompanying piece in the Guardian, the experts shared their views. One scientist from Mexico told the newspaper she felt “hopeless and broken” by the pace of rising climate impacts, while another expert said thinking of the future was “infuriating, distressing, overwhelming”. A separate piece spoke to the female scientists surveyed, a fifth of whom have decided not to have children or to have fewer.
AVOIDING DESPAIR: The Guardian published an editorial alongside the above articles, urging readers not to despair. Although the “future can feel overwhelming and unfixable”, it notes, we need to “build collective awareness, a sense that change is possible and momentum for wider systemic progress”. Additionally, an opinion article by former UN climate chief Christiana Figueres similarly argues that “stubborn optimism may be our only hope”.
Around the world
- BRAZIL FLOODS: Record-breaking floods in southern Brazil have killed more than 105 people and affected more than 1.7 million, with more rain expected, reported O Globo.
- EU AND CHINA TALK TRADE: EU commissioner Ursula von der Leyen has restated readiness to launch a trade war with China over imports of clean energy technologies during a meeting with president Xi Jinping, reported the Guardian. Elsewhere, the South China Morning Post reported that the new climate envoys from China and the US have met for the first time.
- SOUTH ASIA HEATWAVES: Governments across south and south-east Asia have issued health warnings as schools shut and crops fail, as extreme heat continues to grip the region, the Guardian reported. In the Himalayan state of Uttarakhand, five people have been killed by forest fires, reported the Hindustan Times.
- AUSTRALIAN GAS: Australia’s government has announced plans to ramp up the extraction and use of gas to “2050 and beyond”, BBC News reported. The prime minister is now facing an internal revolt from his party, the Guardian added.
- KENYA DAY OF MOURNING: Kenya’s president William Ruto has declared a public day of mourning following the deaths of 238 people due to ongoing flooding, which will be marked by tree-planting, reported the Associated Press.
- LONDON MAYOR: Labour’s Sadiq Khan has pledged further “world-leading green action” after winning a historic third term as London Mayor, reported Bloomberg. Khan’s victory came despite speculation his ambitious air pollution and climate measures could turn off voters.
30%
The proportion of global electricity that came from renewables last year – a new record, according to analysis covered by Carbon Brief.
Latest climate research
- Fewer cooler days due to climate change could make existing varieties of lychee “unsuitable for cultivation in production areas in southern Taiwan”, a new study in Climate Services said.
- Tornado-producing tropical storms may increase “substantially” in the US by 2050 as climate change worsens, new research in Weather and Climate Extremes found.
- New research published in Nature Climate Change found that the transport of ocean heat through the Bering Strait has a more substantial influence on Arctic warming than previously recognised.
(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Tuesday, Wednesday, Thursday and Friday.)
Captured
“Residual emissions” are those that remain once a nation has gone as far as it thinks is possible to cut its emissions. These emissions tend to come from sectors that are considered hard to decarbonise, such as livestock farming and heavy industry. The concept is closely tied with net-zero targets. That is, a country must remove CO2 from the atmosphere that is equivalent in volume to its residual emissions, in order to say it has reached net-zero. A new study covered by Carbon Brief explored national strategies for managing residual emissions. Of the 71 countries examined, just 26 have long-term plans to tackle these emissions. These nations could have residual emissions of up to 2.9bn tonnes of CO2 equivalent by 2050, equal to around 5% of total global emissions. Countries include major emitters such as the US, Canada and Australia (as shown in the above chart). The chart shows residual emissions (red) as a share of each nation’s peak emissions (blue) – or its most recent annual emissions, if its emissions have not yet peaked.
Spotlight
The Thames Barrier at 40
Carbon Brief visits London’s Thames Barrier, the second-largest flood defence barrier in the world, as it turns 40-years-old.
With sea levels rising and flood risks increasing, the UK’s Environment Agency (EA) is working to develop the next era of protections for London and the wider Thames Estuary.
On 25 April, Carbon Brief visited the Thames Barrier to discuss its origins and look forward to its next 40 years.
History
In 1953, London and the east coast of England were devastated by the North Sea Flood, which killed more than 300 people and caused an estimated £50m in damage (approximately £5bn in today’s money) in the region.
While, previously, the UK government had broadly taken a reactive approach to floods, progressively raising the walls and banks of the Thames river, this flood made it clear that such an approach was not sustainable.
In response, one of the first ever “rising sector gates” was built across a 520m-long stretch of the River Thames near Woolwich.
The Thames Barrier was designed by Charles Draper of the London-based Rendel, Palmer and Tritton architectural company, who took inspiration from a gas tap on his cooker. He built a working model in 1969, ahead of construction five years later. The barrier started being used in 1982.
On 8 May 1984, the Queen Elizabeth II officially opened the £535m (£2.4bn in today’s money) Thames Barrier, which remains the second-largest flood defence barrier in the world.
Operation
Now, 40 years on, the Thames Barrier continues to protect 1.4 million people and £321bn of property from tidal flooding.
The Thames Barrier includes 10 steel gates positioned across the width of the river that can be rotated to rise out of the water. Once raised, each 3,300-tonne main gate stands as high as a five-story building and is as wide as the opening of London’s iconic Tower Bridge.
Over the past four decades, it has been closed 221 times for flood defence purposes, including a particular spike in 2013-2014 when it was closed 50 times in 13 weeks.
Andy Batchelor, Thames tidal defences operations manager, who started work at the barrier the day the Queen opened it, said in a statement:
“Having witnessed and worked on the Thames Barrier’s opening, I am immensely proud of the protection it has provided London for the past 40 years and will continue to provide for years to come.
“Its reliability and effectiveness demonstrate the sophistication of its design by a very talented group of engineers and the continued maintenance and operation carried out by the barrier team.”
The next 40 years
The Thames Barrier was only designed to last until 2030. However, the EA, which operates and maintains the site, is confident it will continue to run until 2070.
However, sea levels are predicted to rise 1.5m by the end of the century, increasing the potential for a significant tidal flood. Additionally, with England becoming increasingly wet, the barrier is expected to be called on increasingly – about half of the closures to date have been for river flood protection.
If closing the barrier 50 times in a year becomes the norm, it could fail, the EA has warned, as this does not provide the necessary time for workers to maintain it.
As such, the agency is working on preparing for the next era of flood protection.
The agency is planning to work with partners to continuously review the best available options, including building a new barrier or developing more flood storage, and decide on an end-of-century option by 2040.
Meanwhile, from 2021-27, the government is set to invest £5.6bn in creating new flood and coastal defences to protect hundreds of thousands of properties.
Watch, read, listen
THE $9TN QUESTION: A “big read” in the Financial Times explored how governments worldwide are looking to foot the “immense” bill for the green transition.
BIG BRANDS GREEN CLAIMS: BBC Panorama looked at the “green claims” made by the world’s biggest brands, exposing serious flaws and side-effects of their reliance on carbon offsetting.
ASIAN HEATWAVES: On Himal South Asian’s podcast, environmental social scientist and Carbon Brief contributing editor Dr Chandni Singh discussed why the extreme heat facing the subcontinent this summer is unlike the “heat of the past”.
Coming up
- 13 May: Fourth phase of India’s election
- 14 May: International Energy Agency (IEA) conference on clean cooking in Africa, Paris, France
- 15-17 May: UN Environment Programme: Accelerating urban nature-based solutions: A Latin American-European collaboration, Barcelona, Spain
- 15 May-1 June: IEA-COP29 high-level dialogues, Paris, France
Pick of the jobs
- Carbon Brief, journalist internship | Salary: £13.50 per hour and £100 travel expenses. Location: London
- Conservation International, director of African natural climate solutions roadmap | Salary: Unknown. Location: Nairobi, Kenya
- UK Department of Energy Security and Net Zero, environmental manager | Salary: £69,485-£76,525. Location: Aberdeen, Birmingham, Cardiff, Darlington, Edinburgh or Salford
DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.
This is an online version of Carbon Brief’s weekly DeBriefed email newsletter. Subscribe for free here.
The post DeBriefed 10 May 2024: 11 months of record heat; Climate scientists ‘hopeless and broken’; 40 years of the Thames Barrier appeared first on Carbon Brief.
Greenhouse Gases
Analysis: Constituency of Reform’s climate-sceptic Richard Tice gets £55m flood funding
The Lincolnshire constituency held by Richard Tice, the climate-sceptic deputy leader of the hard-right Reform party, has been pledged at least £55m in government funding for flood defences since 2024.
This investment in Boston and Skegness is the second-largest sum for a single constituency from a £1.4bn flood-defence fund for England, Carbon Brief analysis shows.
Flooding is becoming more likely and more extreme in the UK due to climate change.
Yet, for years, governments have failed to spend enough on flood defences to protect people, properties and infrastructure.
The £1.4bn fund is part of the current Labour government’s wider pledge to invest a “record” £7.9bn over a decade on protecting hundreds of thousands of homes and businesses from flooding.
As MP for one of England’s most flood-prone regions, Tice has called for more investment in flood defences, stating that “we cannot afford to ‘surrender the fens’ to the sea”.
He is also one of Reform’s most vocal opponents of climate action and what he calls “net stupid zero”. He denies the scientific consensus on climate change and has claimed, falsely and without evidence, that scientists are “lying”.
Flood defences
Last year, the government said it would invest £2.65bn on flood and coastal erosion risk management (FCERM) schemes in England between April 2024 and March 2026.
This money was intended to protect 66,500 properties from flooding. It is part of a decade-long Labour government plan to spend more than £7.9bn on flood defences.
There has been a consistent shortfall in maintaining England’s flood defences, with the Environment Agency expecting to protect fewer properties by 2027 than it had initially planned.
The Climate Change Committee (CCC) has attributed this to rising costs, backlogs from previous governments and a lack of capacity. It also points to the strain from “more frequent and severe” weather events, such as storms in recent years that have been amplified by climate change.
However, the CCC also said last year that, if the 2024-26 spending programme is delivered, it would be “slightly closer to the track” of the Environment Agency targets out to 2027.
The government has released constituency-level data on which schemes in England it plans to fund, covering £1.4bn of the 2024-26 investment. The other half of the FCERM spending covers additional measures, from repairing existing defences to advising local authorities.
The map below shows the distribution of spending on FCERM schemes in England over the past two years, highlighting the constituency of Richard Tice.
By far the largest sum of money – £85.6m in total – has been committed to a tidal barrier and various other defences in the Somerset constituency of Bridgwater, the seat of Conservative MP Ashley Fox.
Over the first months of 2026, the south-west region has faced significant flooding and Fox has called for more support from the government, citing “climate patterns shifting and rainfall intensifying”.
He has also backed his party’s position that “the 2050 net-zero target is impossible” and called for more fossil-fuel extraction in the North Sea.
Tice’s east-coast constituency of Boston and Skegness, which is highly vulnerable to flooding from both rivers and the sea, is set to receive £55m. Among the supported projects are beach defences from Saltfleet to Gibraltar Point and upgrades to pumping stations.
Overall, Boston and Skegness has the second-largest portion of flood-defence funding, as the chart below shows. Constituencies with Conservative and Liberal Democrat MPs occupied the other top positions.
Overall, despite Labour MPs occupying 347 out of England’s 543 constituencies – nearly two-thirds of the total – more than half of the flood-defence funding was distributed to constituencies with non-Labour MPs. This reflects the flood risk in coastal and rural areas that are not traditional Labour strongholds.
Reform funding
While Reform has just eight MPs, representing 1% of the population, its constituencies have been assigned 4% of the flood-defence funding for England.
Nearly all of this money was for Tice’s constituency, although party leader Nigel Farage’s coastal Clacton seat in Kent received £2m.
Reform UK is committed to “scrapping net-zero” and its leadership has expressed firmly climate-sceptic views.
Much has been made of the disconnect between the party’s climate policies and the threat climate change poses to its voters. Various analyses have shown the flood risk in Reform-dominated areas, particularly Lincolnshire.
Tice has rejected climate science, advocated for fossil-fuel production and criticised Environment Agency flood-defence activities. Yet, he has also called for more investment in flood defences, stating that “we cannot afford to ‘surrender the fens’ to the sea”.
This may reflect Tice’s broader approach to climate change. In a 2024 interview with LBC, he said:
“Where you’ve got concerns about sea level defences and sea level rise, guess what? A bit of steel, a bit of cement, some aggregate…and you build some concrete sea level defences. That’s how you deal with rising sea levels.”
While climate adaptation is viewed as vital in a warming world, there are limits on how much societies can adapt and adaptation costs will continue to increase as emissions rise.
The post Analysis: Constituency of Reform’s climate-sceptic Richard Tice gets £55m flood funding appeared first on Carbon Brief.
Analysis: Constituency of Reform’s climate-sceptic Richard Tice gets £55m flood funding
Greenhouse Gases
Cropped 25 February 2026: Food inflation strikes | El Niño looms | Biodiversity talks stagnate
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.
Subscribe for free here.
Key developments
Food inflation on the rise
DELUGE STRIKES FOOD: Extreme rainfall and flooding across the Mediterranean and north Africa has “battered the winter growing regions that feed Europe…threatening food price rises”, reported the Financial Times. Western France has “endured more than 36 days of continuous rain”, while farmers’ associations in Spain’s Andalusia estimate that “20% of all production has been lost”, it added. Policy expert David Barmes told the paper that the “latest storms were part of a wider pattern of climate shocks feeding into food price inflation”.
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NO BEEF: The UK’s beef farmers, meanwhile, “face a double blow” from climate change as “relentless rain forces them to keep cows indoors”, while last summer’s drought hit hay supplies, said another Financial Times article. At the same time, indoor growers in south England described a 60% increase in electricity standing charges as a “ticking timebomb” that could “force them to raise their prices or stop production, which will further fuel food price inflation”, wrote the Guardian.
‘TINDERBOX’ AND TARIFFS: A study, covered by the Guardian, warned that major extreme weather and other “shocks” could “spark social unrest and even food riots in the UK”. Experts cited “chronic” vulnerabilities, including climate change, low incomes, poor farming policy and “fragile” supply chains that have made the UK’s food system a “tinderbox”. A New York Times explainer noted that while trade could once guard against food supply shocks, barriers such as tariffs and export controls – which are being “increasingly” used by politicians – “can shut off that safety valve”.
El Niño looms
NEW ENSO INDEX: Researchers have developed a new index for calculating El Niño, the large-scale climate pattern that influences global weather and causes “billions in damages by bringing floods to some regions and drought to others”, reported CNN. It added that climate change is making it more difficult for scientists to observe El Niño patterns by warming up the entire ocean. The outlet said that with the new metric, “scientists can now see it earlier and our long-range weather forecasts will be improved for it.”
WARMING WARNING: Meanwhile, the US Climate Prediction Center announced that there is a 60% chance of the current La Niña conditions shifting towards a neutral state over the next few months, with an El Niño likely to follow in late spring, according to Reuters. The Vibes, a Malaysian news outlet, quoted a climate scientist saying: “If the El Niño does materialise, it could possibly push 2026 or 2027 as the warmest year on record, replacing 2024.”
CROP IMPACTS: Reuters noted that neutral conditions lead to “more stable weather and potentially better crop yields”. However, the newswire added, an El Niño state would mean “worsening drought conditions and issues for the next growing season” to Australia. El Niño also “typically brings a poor south-west monsoon to India, including droughts”, reported the Hindu’s Business Line. A 2024 guest post for Carbon Brief explained that El Niño is linked to crop failure in south-eastern Africa and south-east Asia.
News and views
- DAM-AG-ES: Several South Korean farmers filed a lawsuit against the country’s state-owned utility company, “seek[ing] financial compensation for climate-related agricultural damages”, reported United Press International. Meanwhile, a national climate change assessment for the Philippines found that the country “lost up to $219bn in agricultural damages from typhoons, floods and droughts” over 2000-10, according to Eco-Business.
- SCORCHED GRASS: South Africa’s Western Cape province is experiencing “one of the worst droughts in living memory”, which is “scorching grass and killing livestock”, said Reuters. The newswire wrote: “In 2015, a drought almost dried up the taps in the city; farmers say this one has been even more brutal than a decade ago.”
- NOUVELLE VEG: New guidelines published under France’s national food, nutrition and climate strategy “urged” citizens to “limit” their meat consumption, reported Euronews. The delayed strategy comes a month after the US government “upended decades of recommendations by touting consumption of red meat and full-fat dairy”, it noted.
- COURTING DISASTER: India’s top green court accepted the findings of a committee that “found no flaws” in greenlighting the Great Nicobar project that “will lead to the felling of a million trees” and translocating corals, reported Mongabay. The court found “no good ground to interfere”, despite “threats to a globally unique biodiversity hotspot” and Indigenous tribes at risk of displacement by the project, wrote Frontline.
- FISH FALLING: A new study found that fish biomass is “falling by 7.2% from as little as 0.1C of warming per decade”, noted the Guardian. While experts also pointed to the role of overfishing in marine life loss, marine ecologist and study lead author Dr Shahar Chaikin told the outlet: “Our research proves exactly what that biological cost [of warming] looks like underwater.”
- TOO HOT FOR COFFEE: According to new analysis by Climate Central, countries where coffee beans are grown “are becoming too hot to cultivate them”, reported the Guardian. The world’s top five coffee-growing countries faced “57 additional days of coffee-harming heat” annually because of climate change, it added.
Spotlight
Nature talks inch forward
This week, Carbon Brief covers the latest round of negotiations under the UN Convention on Biological Diversity (CBD), which occurred in Rome over 16-19 February.
The penultimate set of biodiversity negotiations before October’s Conference of the Parties ended in Rome last week, leaving plenty of unfinished business.
The CBD’s subsidiary body on implementation (SBI) met in the Italian capital for four days to discuss a range of issues, including biodiversity finance and reviewing progress towards the nature targets agreed under the Kunming-Montreal Global Biodiversity Framework (GBF).
However, many of the major sticking points – particularly around finance – will have to wait until later this summer, leaving some observers worried about the capacity for delegates to get through a packed agenda at COP17.
The SBI, along with the subsidiary body on scientific, technical and technological advice (SBSTTA) will both meet in Nairobi, Kenya, later this summer for a final round of talks before COP17 kicks off in Yerevan, Armenia, on 19 October.
Money talks
Finance for nature has long been a sticking point at negotiations under the CBD.
Discussions on a new fund for biodiversity derailed biodiversity talks in Cali, Colombia, in autumn 2024, requiring resumed talks a few months later.
Despite this, finance was barely on the agenda at the SBI meetings in Rome. Delegates discussed three studies on the relationship between debt sustainability and implementation of nature plans, but the more substantive talks are set to take place at the next SBI meeting in Nairobi.
Several parties “highlighted concerns with the imbalance of work” on finance between these SBI talks and the next ones, reported Earth Negotiations Bulletin (ENB).
Lim Li Ching, senior researcher at Third World Network, noted that tensions around finance permeated every aspect of the talks. She told Carbon Brief:
“If you’re talking about the gender plan of action – if there’s little or no financial resources provided to actually put it into practice and implement it, then it’s [just] paper, right? Same with the reporting requirements and obligations.”
Monitoring and reporting
Closely linked to the issue of finance is the obligations of parties to report on their progress towards the goals and targets of the GBF.
Parties do so through the submission of national reports.
Several parties at the talks pointed to a lack of timely funding for driving delays in their reporting, according to ENB.
A note released by the CBD Secretariat in December said that no parties had submitted their national reports yet; by the time of the SBI meetings, only the EU had. It further noted that just 58 parties had submitted their national biodiversity plans, which were initially meant to be published by COP16, in October 2024.
Linda Krueger, director of biodiversity and infrastructure policy at the environmental not-for-profit Nature Conservancy, told Carbon Brief that despite the sparse submissions, parties are “very focused on the national report preparation”. She added:
“Everybody wants to be able to show that we’re on the path and that there still is a pathway to getting to 2030 that’s positive and largely in the right direction.”
Watch, read, listen
NET LOSS: Nigeria’s marine life is being “threatened” by “ghost gear” – nets and other fishing equipment discarded in the ocean – said Dialogue Earth.
COMEBACK CAUSALITY: A Vox long-read looked at whether Costa Rica’s “payments for ecosystem services” programme helped the country turn a corner on deforestation.
HOMEGROWN GOALS: A Straits Times podcast discussed whether import-dependent Singapore can afford to shelve its goal to produce 30% of its food locally by 2030.
‘RUSTING’ RIVERS: The Financial Times took a closer look at a “strange new force blighting the [Arctic] landscape”: rivers turning rust-orange due to global warming.
New science
- Lakes in the Congo Basin’s peatlands are releasing carbon that is thousands of years old | Nature Geoscience
- Natural non-forest ecosystems – such as grasslands and marshlands – were converted for agriculture at four times the rate of land with tree cover between 2005 and 2020 | Proceedings of the National Academy of Sciences
- Around one-quarter of global tree-cover loss over 2001-22 was driven by cropland expansion, pastures and forest plantations for commodity production | Nature Food
In the diary
- 2-6 March: UN Food and Agriculture Organization regional conference for Latin America and Caribbean | Brasília
- 5 March: Nepal general elections
- 9-20 March: First part of the thirty-first session of the International Seabed Authority (ISA) | Kingston, Jamaica
Cropped is researched and written by Dr Giuliana Viglione, Aruna Chandrasekhar, Daisy Dunne, Orla Dwyer and Yanine Quiroz.
Please send tips and feedback to cropped@carbonbrief.org
The post Cropped 25 February 2026: Food inflation strikes | El Niño looms | Biodiversity talks stagnate appeared first on Carbon Brief.
Cropped 25 February 2026: Food inflation strikes | El Niño looms | Biodiversity talks stagnate
Rising temperatures across France since the mid-1970s is putting Tour de France competitors at “high risk”, according to new research.
The study, published in Scientific Reports, uses 50 years of climate data to calculate the potential heat stress that athletes have been exposed to across a dozen different locations during the world-famous cycling race.
The researchers find that both the severity and frequency of high-heat-stress events have increased across France over recent decades.
But, despite record-setting heatwaves in France, the heat-stress threshold for safe competition has rarely been breached in any particular city on the day the Tour passed through.
(This threshold was set out by cycling’s international governing body in 2024.)
However, the researchers add it is “only a question of time” until this occurs as average temperatures in France continue to rise.
The lead author of the study tells Carbon Brief that, while the race organisers have been fortunate to avoid major heat stress on race days so far, it will be “harder and harder to be lucky” as extreme heat becomes more common.
‘Iconic’
The Tour de France is one of the world’s most storied cycling races and the oldest of Europe’s three major multi-week cycling competitions, or Grand Tours.
Riders cover around 3,500 kilometres (km) of distance and gain up to nearly 55km of altitude over 21 stages, with only two or three rest days throughout the gruelling race.
The researchers selected the Tour de France because it is the “iconic bike race. It is the bike race of bike races,” says Dr Ivana Cvijanovic, a climate scientist at the French National Research Institute for Sustainable Development, who led the new work.
Heat has become a growing problem for the competition in recent years.
In 2022, Alexis Vuillermoz, a French competitor, collapsed at the finish line of the Tour’s ninth stage, leaving in an ambulance and subsequently pulling out of the race entirely.
Two years later, British cyclist Sir Mark Cavendish vomited on his bike during the first stage of the race after struggling with the 36C heat.
The Tour also makes a good case study because it is almost entirely held during the month of July and, while the route itself changes, there are many cities and stages that are repeated from year to year, Cvijanovic adds.
‘Have to be lucky’
The study focuses on the 50-year span between 1974 and 2023.
The researchers select six locations across the country that have commonly hosted the Tour, from the mountain pass of Col du Tourmalet, in the French Pyrenees, to the city of Paris – where the race finishes, along the Champs-Élysées.
These sites represent a broad range of climatic zones: Alpe d’ Huez, Bourdeaux, Col du Tourmalet, Nîmes, Paris and Toulouse.
For each location, they use meteorological reanalysis data from ERA5 and radiant temperature data from ERA5-HEAT to calculate the “wet-bulb globe temperature” (WBGT) for multiple times of day across the month of July each year.
WBGT is a heat-stress index that takes into account temperature, humidity, wind speed and direct sunlight.
Although there is “no exact scientific consensus” on the best heat-stress index to use, WBGT is “one of the rare indicators that has been originally developed based on the actual human response to heat”, Cvijanovic explains.
It is also the one that the International Cycling Union (UCI) – the world governing body for sport cycling – uses to assess risk. A WBGT of 28C or higher is classified as “high risk” by the group.
WBGT is the “gold standard” for assessing heat stress, says Dr Jessica Murfree, director of the ACCESS Research Laboratory and assistant professor at the University of North Carolina at Chapel Hill.
Murfree, who was not involved in the new study, adds that the researchers are “doing the right things by conducting their science in alignment with the business practices that are already happening”.
The researchers find that across the 50-year time period, WBGT has been increasing across the entire country – albeit, at different rates. In the north-west of the country, WBGT has increased at an average rate of 0.1C per decade, while in the southern and eastern parts of the country, it has increased by more than 0.5C per decade.
The maps below show the maximum July WBGT for each decade of the analysis (rows) and for hourly increments of the late afternoon (columns). Lower temperatures are shown in lighter greens and yellows, while higher temperatures are shown in darker reds and purples.
Six Tour de France locations analysed in the study are shown as triangles on the maps (clockwise from top): Paris, Alpe d’ Huez, Nîmes, Toulouse, Col du Tourmalet and Bordeaux.
The maps show that the maximum WBGT temperature in the afternoon has surpassed 28C over almost the entire country in the last decade. The notable exceptions to this are the mountainous regions of the Alps and the Pyrenees.
The researchers also find that most of the country has crossed the 28C WBGT threshold – which they describe as “dangerous heat levels” – on at least one July day over the past decade. However, by looking at the WBGT on the day the Tour passed through any of these six locations, they find that the threshold has rarely been breached during the race itself.
For example, the research notes that, since 1974, Paris has seen a WBGT of 28C five times at 3pm in July – but that these events have “so far” not coincided with the cycling race.
The study states that it is “fortunate” that the Tour has so far avoided the worst of the heat-stress.
Cvijanovic says the organisers and competitors have been “lucky” to date. She adds:
“It has worked really well for them so far. But as the frequency of these [extreme heat] events is increasing, it will be harder and harder to be lucky.”
Dr Madeleine Orr, an assistant professor of sport ecology at the University of Toronto who was not involved in the study, tells Carbon Brief that the paper was “really well done”, noting that its “methods are good [and its] approach was sound”. She adds:
“[The Tour has] had athletes complain about [the heat]. They’ve had athletes collapse – and still those aren’t the worst conditions. I think that that says a lot about what we consider safe. They’ve still been lucky to not see what unsafe looks like, despite [the heat] having already had impacts.”
Heat safety protocols
In 2024, the UCI set out its first-ever high temperature protocol – a set of guidelines for race organisers to assess athletes’ risk of heat stress.
The assessment places the potential risk into one of five categories based on the WBGT, ranging from very low to high risk.
The protocol then sets out suggested actions to take in the event of extreme heat, ranging from having athletes complete their warm-ups using ice vests and cold towels to increasing the number of support vehicles providing water and ice.
If the WBGT climbs above the 28C mark, the protocol suggests that organisers modify the start time of the stage, adapt the course to remove particularly hazardous sections – or even cancel the race entirely.
However, Orr notes that many other parts of the race, such as spectator comfort and equipment functioning, may have lower temperatures thresholds that are not accounted for in the protocol, but should also be considered.
Murfree points out that the study’s findings – and the heat protocol itself – are “really focused on adaptation, rather than mitigation”. While this is “to be expected”, she tells Carbon Brief:
“Moving to earlier start times or adjusting the route specifically to avoid these locations that score higher in heat stress doesn’t stop the heat stress. These aren’t climate preventative measures. That, I think, would be a much more difficult conversation to have in the research because of the Tour de France’s intimate relationship with fossil-fuel companies.”
The post Dangerous heat for Tour de France riders only a ‘question of time’ appeared first on Carbon Brief.
Dangerous heat for Tour de France riders only a ‘question of time’
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Climate Change7 months ago
Guest post: Why China is still building new coal – and when it might stop
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Greenhouse Gases2 years ago嘉宾来稿：满足中国增长的用电需求 光伏加储能“比新建煤电更实惠”
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Climate Change2 years ago
Bill Discounting Climate Change in Florida’s Energy Policy Awaits DeSantis’ Approval
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Climate Change2 years ago
Spanish-language misinformation on renewable energy spreads online, report shows
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Climate Change2 years ago嘉宾来稿：满足中国增长的用电需求 光伏加储能“比新建煤电更实惠”
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Climate Change Videos2 years ago
The toxic gas flares fuelling Nigeria’s climate change – BBC News
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Carbon Footprint2 years agoUS SEC’s Climate Disclosure Rules Spur Renewed Interest in Carbon Credits