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国际能源署(IEA)在一份报告中称,热泵的普及可以加快中国高碳排的建筑和轻工业在用暖过程中的脱碳。

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这份与清华大学合作发布的报告认为,由于使用热泵可以提高电气化程度并改善能效,因此如果把使用热泵作为中国实现2060年碳中和战略的一部分,为建筑供暖而产生的直接碳排放量到2025年将下降75%,降至7000万吨二氧化碳(MtCO2)。

同样,使用热泵也有助于减少为轻工业生产提供热量而产生二氧化碳排放。这可以将直接排放量从目前的1.1亿吨二氧化碳,减少到2050年的1000万吨二氧化碳以下。

2023年,中国是少数几个热泵总销量上升的国家之一。然而,报告指出,热泵的普及和建筑、轻工业向使用更多低碳能源的转型仍需要更多政策支持。

中国在供热方面消耗了多少能源?

2022年,中国的终端能源消费量为107艾焦(EJ)。国际能源署报告称,这其中热力消费量约为50艾焦。中国热力消费量相当于全球热力消费总量的“约三分之一”。

中国约四分之一的热力用于建筑业,其余用于工业。

在建筑领域,过去十年中国的热力消费增长速度超过任何其他国家,在2022年达到12艾焦。这主要是由于空间和水的用热需求不断增长,自2000年以来,直接和间接排放量增加了“近三倍”。

自2010年以来,用于供热的煤炭消费量总体下降了15%。国际能源署的报告将此归功于2010年代中期开始的政策推动。这些政策最初是“为了改善空气质量,后来是为了扩大清洁低碳能源的供暖”。

然而,区域供热——即集中供热机制——是一个例外。它是中国北方城市地区的主要热源。热泵和其他分散式解决方案在中国南方和北方农村地区更为常见。

中国北方的区域供热网络80%以上的热量生产来自煤炭。据国际能源署称,这是全国建筑供热中煤炭消耗的主要驱动因素。

2019年的一项研究发现,中国仅区域供热的碳排放量就超过了英国的二氧化碳排放总量。

该报告的主要作者基亚拉·德尔马斯特罗(Chiara Delmastro)博士和拉斐尔·马丁内斯·戈登(Rafael Martinez Gordon)博士告诉Carbon Brief:“(这)主要是由于中国北方城市(供热)网络扩张的推动,特别是……自2010年以来,区域供热网络的长度增加了250%,其中绝大部分在北方。”

不过,德尔马斯特罗和马丁内斯·戈登也指出,“中国近年来已经采取行动,朝着更清洁、更高效的供暖方向发展”——例如,从使用燃煤锅炉向更高效的热电联产电厂转型。

同时,2022年的工业用热总量为38艾焦。其中部分需求为中低温热力(低于200°C),这通常是轻工业、纸浆和造纸行业,以及一些化工行业工序所需的。

报告称,2022年这些中低温热力的需求量为4.7艾焦,直接碳排放量超过1.1亿吨二氧化碳,它可以通过现有最先进的热泵技术轻松满足。

然而,超过80%的工业供热需求需要200°C以上温度,这样的高温主要用于钢铁制造。其他需要如此高温的行业包括非金属矿物和有色金属,以及化工和石化、纸浆和造纸行业的一些流程。这些行业是工业供热需求的大用户,在2022年的消费量为33艾焦。

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热泵如何帮助中国实现“双碳”目标?

中国建筑业和工业的供热需求主要由煤炭驱动,占中国煤炭消费量和二氧化碳排放量的40%。

不过,国际能源署也指出,煤炭供热量已略有减少,这主要归功于“改善空气质量、减少二氧化碳排放和最大限度提高能效的政策”。

2022年,在中国建筑的直接排放中,空间和水用热产生的碳排放量占绝大多数,约为2.9亿吨二氧化碳,而轻工业用热产生的直接排放总量为1.1亿吨二氧化碳。据国际能源署预计,中国2022年碳排放总量达到121.35亿吨二氧化碳。

该报告提供了在已宣布承诺情景(APS)下中国热泵使用量的估算。在该情景下,政府被假定会按时、全面地实现其所有气候目标。

报告还考察了既定政策情景(STEPS)下的热泵使用量情况,其反映了国际能源署自己对政府政策当前走向的判断。

如果中国坚持其“双碳”承诺、与已宣布承诺情景保持一致,那么国际能源署预计到2050年,建筑业热泵的装机容量将增至1400吉瓦(GW),可满足中国在该行业四分之一的用热需求。

根据已宣布承诺情景,到2050年,中国建筑行业每年将安装100吉瓦的热泵,相当于“美国、中国和欧盟在2022年部署的总容量”。

到2050年,建筑供热的排放量将从2.9亿吨二氧化碳降至8000万吨,减少2.1亿吨,其中热泵的贡献占到了30%。建筑业脱碳的其他驱动力还包括更多地采用电气化、能效措施和行为改变。

在轻工业方面,根据已宣布承诺情景,在2025至2050年间,中国每年将新增热泵装机容量约1.5吉瓦,可以在2050年满足五分之一的用热需求。

这将有助于“大幅”减少碳排放,其总量将从逾1.1亿吨二氧化碳锐减95%至1000万吨。电气化(包括通过采用热泵)将贡献减排量的70%。

Heat pump types and applications

报告还指出,有两个高耗能行业非常适合使用热泵:其一是纸浆和造纸行业,其目前约55%的用热需求可由工业热泵提供;其二是化工行业,该行业约18%的需求可由工业热泵提供。

然而,热泵不太可能满足其他高耗能行业的需求,因为“目前只有少数能满足200摄氏度以上温度的早期原型机,所有这些都远未为大众市场做好准备”。

即使在既定政策情景下,中国建筑行业中的热泵存量也将翻一番,到2050年将超过1100吉瓦,并推动建筑业排放量减少25%以上,煤改气等燃料转换措施也将发挥作用。

对于轻工业而言,在既定政策情景下,由热泵推动的碳减排 “仍然有限”,因为在当前的政策背景下,热泵的“部署可能比较缓慢”。总体而言,到2050年,与热力相关的排放量只会减少15%。

报告称,重要的是,在已宣布承诺情景下,中国和世界其他国家为实现气候目标所需的政策将“极大地调动”某些行业的积极性。采矿和机械等行业需要扩张,提高清洁能源技术产量,以满足国内和全球需求。

虽然与既定政策情景相比,这些新增工业活动将使已宣布承诺情景下中国的用热需求增加5%,但更广泛地应用电气化和清洁供热技术所节省的能源将足以抵消相关排放量。

此外,报告还指出,热泵的部署将使到2050年供热的能源强度(即单位热量的能源需求)比现在下降20%。

报告还补充称,随着更多可再生能源和核能发电并网,到2030年,热泵使用的扩张与电力系统去碳化之间的配合将使供热用电的间接排放量下降40%以上。到2050年,电力在供热中的份额可能超过75%。

例如,国际能源署指出,如果中国的气候目标得以实现,纸浆和造纸行业“到2050年将几乎完全淘汰”煤炭使用。由于电气化和煤改气,该行业已将煤炭在其能源需求中所占比例从2010年的43%减少到2022年的10%。

根据已宣布承诺情景,到2030年,中国用于空间和水供热的直接煤炭使用量将下降75%,到2040年将“几乎完全淘汰”,到2050年,热泵将成为城乡供热的关键技术。

然而,在这种情景下,需要大量投资才能部署足够的热泵来满足需求。

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热泵在中国的应用效果如何?

报告称,在2023年,中国建筑业热泵装机容量超过250吉瓦,该国热泵销量占全球的25%以上,是2023年唯一热泵销量出现增长的主要市场。2022年,热泵占中国建筑业供热设备销售总量的8%。

在华中和华南部分地区,在没有集中区域供暖的情况下,热泵已成为建筑空间供暖和制冷的“常态”。报告补充说,由于当局通过政策支持鼓励农村地区限制煤炭消费,农村地区正在越来越多地采用热泵。

区域供热的情况也是如此,集中供暖管网运营商们正在越来越多地安装热泵。虽然大多数是在相对较低温度下运行的“空气源”热泵,但一些运营商也开始安装大型热泵,以回收钢铁厂、污水处理设施和煤化工工厂的废热。

报告称,这些热泵“为区域供热网络、建筑和工业提供了热力脱碳最有效的选择之一”。

目前中国单个热泵每年的碳排放量——无论是直接排放还是间接排放——都比燃气锅炉低30%以上。报告称:“从化石燃料锅炉转向热泵将减少几乎所有安装场所的二氧化碳排放”。

国际能源机构称,尽管热泵的前期安装成本较高,但它能帮助用户在使用期内节省能源开支。

下图显示了中国不同的气候带。在一些气候寒冷以及夏热冬冷的地区,空气能热泵比燃气锅炉和电加热器更具成本效益。

Map: Future of heat pumps in China
中国气候区图、采暖度日数以及中国人口超过 100 万的选定城市的分布。本文中地图上使用的名称和材料并不代表 Carbon Brief 对任何国家、领土、城市或地区,或其当局的法律地位,或有关其边界的划定。资料来源:国际能源署 (2024)

空气-水热泵比电取暖器更省钱,尽管在电价比天然气更有竞争力的地区,它们只比燃气锅炉便宜。

在高耗能行业中使用热泵的可行性较低,因为目前产生200°C以上高温的技术基本上仍在开发阶段。

但报告指出,对轻工业而言,工业热泵比燃气锅炉和电锅炉“便宜得多”,并且由于高能效,在其使用寿命内成本几乎可以与燃煤锅炉相媲美。

尽管如此,由于前期安装成本高昂以及公众对热泵的有效性缺乏认识,热泵的使用并不普遍。

德尔马斯特罗和马丁内斯·戈登告诉Carbon Brief:“在某些流程中,(热泵)的替代技术可能成本更低且更合适,而且不同的政策决定可能会刺激热泵应用的广泛性。但为了实现中国的碳中和目标,我们估计到2050年,热泵需至少满足轻工业20%的热力需求。”

该报告补充说,最先进的热泵——新发布或即将发布的热泵技术——能够很好地满足建筑领域和轻工业领域的用热需求,理论上可满足约40%的需求。

此外,中国目前浪费的热能资源可以通过热泵进行再利用。报告称,2021年,中国的核电站、其他发电厂、工业活动、数据中心和废水等来源产生了45艾焦的废热资源,几乎相当于建筑和工业用热需求总和。

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政策如何支持热泵的应用?

作为能源转型的一个方面,热泵在中国国家级能源和气候政策中出现的频率“日益增加”。例如,《“十四五”现代能源体系规划》(2021-2025)要求提升终端用能低碳化电气化水平。

然而,德尔马斯特罗和马丁内斯·戈登解释说,国际能源署报告中更有针对性和实用的政策建议“应该(被纳入)一个明确的供热脱碳国家行动计划中,而这正是中国目前所缺乏的”。

该计划将使中国能够为热泵的使用设定量化目标,向市场发出明确信号,并促进对研发、制造和部署的更广泛投资。

与此同时,报告还建议:对新建建筑提出更严格的性能要求、制定更严格的能效基准、在建筑规范中纳入热泵安装要求,以及将国家碳排放权交易体系范围扩大到工业领域,这些都可以推动热泵的应用。

报告补充称,贷款、税收抵免和其他财政支持机制可以解决消费者不愿支付高昂的前期安装费用的问题。

北方城市天津为购买空气源热泵的用户提供了2.5万元(3700美元)的补贴,但这种做法(尤其在城市地区)并不普遍。

报告说,提高人们对工业热泵益处的认识并降低工业用电成本,可加快轻工业对热泵的采用。

电价激励措施已促使农村居民区从煤炭供暖转变为天然气供暖。根据国际能源署的计算,在北京的农村地区,类似的电价激励措施以及对安装热泵的补贴意味着热泵已成为当地家庭最便宜的取暖选择。

报告指出,在全国范围内推广这一政策可以“进一步提高热泵在目前电价明显高于天然气的地区的竞争力”。

​其他可使热泵对消费者更具吸引力的措施包括,将热泵与太阳能电池板或太阳能光热解决方案相结合,以及调整电力系统以提供阶梯电价和分时电力市场措施。

最后,报告称,更多地回收废弃能源并结合热能储存技术,可以“通过将多余电力……转化为热能并储存起来供冬季供暖使用,从而优化供热”。

报告补充说,“以河北北部为例,到2050年,热泵从可再生能源和废热中回收的热力可占到冬季区域供热量的80%”。

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The post 国际能源署:热泵可帮助中国减少75%为建筑供暖而产生的碳排放 appeared first on Carbon Brief.

国际能源署:热泵可帮助中国减少75%为建筑供暖而产生的碳排放

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Greenhouse Gases

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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Greenhouse Gases

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.
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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

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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Greenhouse Gases

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.”

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