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Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.

This week

COP crunch

FINAL CALL: COP29 has entered its final scheduled day in Baku. Yesterday’s six-hour “Qurultay” meeting witnessed “unanimous” disappointment over the state of draft texts, with developing countries unhappy about the lack of numbers on climate finance and almost all calling for clearer language on climate action. (Carbon Brief’s Simon Evans live-posted highlights from the event.) Around 3pm local time today, the COP29 presidency released a package of new texts, just hours before talks were due to close. At least one further iteration is expected. 

FINANCE FIGHT: The new proposal for a global climate finance goal would involve developed countries “taking the lead” in channelling $250bn a year by 2035 to “help poorer nations” deal with climate change, Reuters reported. It added that the proposal has drawn criticism “from all sides”. Politico noted that it “falls far short of the trillion-plus figure that the poorer countries had sought”. For more on the draft finance deal, see Spotlight below.

STOCKTAKE STUTTERS: Last year’s “global stocktake” at COP28 included the landmark deal to “transition away from fossil fuels”. But the latest draft on the “mitigation work programme” excised all links back to this. Carrying things forward has been left to the “UAE dialogue”, which, in its latest draft, “reaffirms” last year’s language on fossil fuels, renewables and energy efficiency. It also has optional text adding further goals on energy storage and grids, as well as requesting an annual progress report for debate at subsequent COPs.

WILL IT END?: Seasoned COP watchers will know that the talks almost always run past their scheduled finish time. Carbon Brief’s analysis of previous finish times suggests that, if COP29 follows the upward trend, it will end at 3.25am on Sunday morning. Carbon Brief also polled a group of more than 200 delegates to ask when they think COP29 will end, with the mean time selected being 1:34am on Sunday. After talks finally draw to a close, Carbon Brief journalists will hold a free webinar to discuss the key outcomes. Sign up.

Around the COP

  • ARGENTINA STAYS: Argentina confirmed it will not leave the Paris Agreement, squashing rumours ignited after right-wing populist leader Javier Milei decided to withdraw his country’s delegation from the talks last week, El Observador reported.
  • INDONESIAN TRANSITION: Indonesia’s president Prabowo Subianto announced plans to retire all coal and other fossil-fuel power stations within 15 years, while also aiming to bring the nation’s net-zero target forward by a decade, said the Associated Press. It said experts “welcomed” the ambition, but are “sceptical” of its delivery.
  • POWER PLAY: The UK launched a “global clean power alliance” at the G20, with Brazil, Australia, Canada and France among members, according to the Press Association. The leaders of the UK and Brazil wrote joint op-eds touting the pact in the Times and Folha de São Paulo.
  • COP ‘STAND-OFF’: Australia and Turkey are currently in a “stand-off” over who will host COP31 in 2026, with neither party willing to give up their bid, Reuters said.
  • ‘BIZARRE’ RESTRICTIONS: COP29 host Azerbaijan went to “bizarre” lengths to prepare Baku for the summit, Bloomberg reported. This included clearing public areas and roads by moving parliamentary elections, shutting schools and universities and ordering two-thirds of the city to work from home.
  • LOBBYISTS: A Global Witness investigation found that at least 1,700 fossil-fuel executives registered to attend COP29, lower than the record in Dubai, but still larger than most party delegations. The Guardian reported that “hundreds” of industrial farming lobbyists have also been in attendance.

Zero

The number of new countries at COP29 joining a small alliance of nations that have pledged to phase out oil and gas.


Latest climate research

  • Climate lawsuits and negative court decisions can reduce the value of publicly listed companies, a Nature Sustainability study suggested.
  • Early 20th century global ocean surface temperatures were warmer than previously thought, a study in Nature has found, meaning the pace of heating from 1900 to the 1950s was slightly slower than assumed.
  • A Nature Geoscience study found that the weakening of the Atlantic Meridional Overturning Circulation (AMOC) – a major system of ocean currents responsible for transporting heat around the world – could be linked to influxes of freshwater into the subarctic Atlantic.

(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)

Captured

China's contribution to global warming has just overtaken the EU. Chart showing cumulative historical CO2 emissions, 1850-2024, in billion tonnes.

China’s historical emissions within its borders have now caused more global warming than the 27 member states of the EU combined, according to new Carbon Brief analysis. However, China is still far behind the world’s largest historical emitter, the US, the analysis showed. It added that China is unlikely to ever overtake the US, based on current policies, committed plans and technology trends in both countries. Carbon Brief’s analysis is featured in a data-driven article in the New York Times.

Spotlight

Decoding the COP29 finance proposal

Carbon Brief unravels the latest hotly contested climate-finance text from COP29 and explains the main sticking points.

Nations have a deadline at COP29 to agree on a new goal for channelling money into cutting emissions and protecting people from climate change.

This target will replace an existing obligation for “developed” countries – including EU states, the US and Japan – to provide $100bn of climate finance a year to “developing” countries. 

Money has always been one of the most controversial aspects of UN climate talks and COP29 has exposed deep rifts.

A draft text outlining the new goal published earlier today shows that, on the day the talks are meant to finish, these tensions are far from being resolved. Developing countries and climate NGOs described the proposal as “totally unacceptable” and a “joke”.

Parties will now digest this text and at least one new version will be produced by the Azerbaijani presidency as the talks drag into overtime.

Billions

8. In this context, decides to set a goal in extension of the goal referred to in paragraph 53 of decision 1/CP.21, with developed country Parties taking the lead, to USD 250 billion per year by 2035 for developing country Parties for climate action:

The proposed goal has two parts. At its core is $250bn delivered each year to developing countries by 2035.

This is framed as the continuation of the $100bn annual goal, which is provided entirely by developed countries. Yet, in this text, developed countries only “take the lead”, leaving the goal open for others to contribute.

As with the $100bn, this goal would include public money, such as development aid, as well as private finance that is “mobilised” by public spending.

The target matches one floated to Politico by EU sources earlier in the week, which was greeted with derision by global-south leaders. Developing countries had demanded a similar core goal of $440-900bn, but made up entirely of public money and largely as grants.

Crucially, analysts have found that comparable amounts of climate finance could be provided in this timeframe, even if developed countries make no extra effort to contribute more in the coming years, beyond existing commitments.

Trillions

7. Calls on all actors to work together to enable the scaling up of financing to developing country Parties for climate action from all public and private sources to at least USD 1.3 trillion per year by 2034;

From the start of COP29, all developing countries have been united behind a call for $1.3tn in climate finance a year, provided by developed countries. 

There is broad agreement among experts that developing countries need to invest trillions of dollars each year to fulfil their climate goals, with large chunks coming from developed countries.

The new text includes a “call” to raise $1.3tn in climate finance by 2035.

However, it does not line up with developing countries’ proposals and, instead, reflects developed countries’ long-standing vision of a broader goal based on global “investment”. It refers to the $1.3tn coming from “all public and private sources”.

On the other hand, some of the more contentious ideas put forward by developed countries, such as the US, are no longer in the text. For example, it does not reference “domestic spending” in counting towards the goal.

Contributors

9. Invites developing country Parties to make additional contributions, including through South-South cooperation, to or supplementing, the goal set forth in paragraph 8 above;

One of the most disputed topics in climate-finance talks has been expanding the list of contributors beyond developed countries. 

Many nations classed as “developing” in the UN climate system, such as China and Saudi Arabia, are relatively wealthy and major contributors to climate change. This, some argue, means they should be obliged to provide finance.

There is no longer a formal recognition of this in the new text. An attempt by some developed countries to add criteria for new contributors was deleted the previous day.

COP29 has seen some wrangling around this issue. Observers welcomed China referencing the billions of dollars in climate funds it already provides to the global south and the EU expressed its openness to recognising “voluntary” contributions from developing countries.

In the end, the draft text “invites” developing countries to contribute. It also references “voluntary” counting of contributions from multilateral development banks, to which emerging economies provide large sums of money.

The climate-finance text contains many more notable compromises, which are summarised in this thread. All eyes are now on what the final text, agreed by all parties at COP29, will say.

Watch, read, listen

‘TRUMP ATE MY HOMEWORK’: A comment piece by Avantika Goswami in Down to Earth picked apart the “narrative of a prejudged failed COP” in a crucial year for climate finance.

‘GRANTS, NOT LOANS’: The Green Pulse podcast by Singapore’s Straits Times explained what the COP29 finance goal means and why more “loans can’t help” vulnerable communities in developing countries.

ASIAN AGE: Historian and author Adam Tooze discussed climate, trade wars, geopolitics and the “polycrisis” in Asia in his State of Asia 2024 address.

Coming up

Pick of the jobs

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 COP29 DeBriefed 22 November 2024: Countries split on climate finance; Fossil-fuel transition ‘reaffirmed’; Latest texts analysed appeared first on Carbon Brief.

COP29 DeBriefed 22 November 2024: Countries split on climate finance; Fossil-fuel transition ‘reaffirmed’; Latest texts analysed

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Analysis: Constituency of Reform’s climate-sceptic Richard Tice gets £55m flood funding

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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.

Map of England showing that Richard Tice's Boston and Skegness constituency is set to receive at least £55m for flood defences between 2024 and 2026
Flood-defence spending on new and replacement schemes in England in 2024-25 and 2025-26. The government notes that, as Environment Agency accounts have not been finalised and approved, the investment data is “provisional and subject to change”. Some schemes cover multiple constituencies and are not included on the map. Source: Environment Agency FCERM data.

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.

Chart showing that Conservative, Reform and Liberal Democrat constituencies are the top recipients of flood defence spending
Top 10 English constituencies by FCERM funding in 2024-25 and 2025-26. Source: Environment Agency FCERM data.

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

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Cropped 25 February 2026: Food inflation strikes | El Niño looms | Biodiversity talks stagnate

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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.
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”.

Subscribe: Cropped
  • Sign up to Carbon Brief’s free “Cropped” email newsletter. A fortnightly digest of food, land and nature news and views. Sent to your inbox every other Wednesday.

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

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

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Dangerous heat for Tour de France riders only a ‘question of time’

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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.

Maximum WBGT across France for the month of July from 1974-2023. Rows show the values for each decade and columns show the hourly values for 3:00pm, 4:00pm, 5:00pm and 6:00pm. Lower temperatures are shown in lighter greens and yellows, while higher temperatures are shown in darker reds and purples. Triangles indicate the six Tour de France locations analysed in the study. Source: Cvijanovic et al. (2026)

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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