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Key developments
First ministerial China-UK ‘climate dialogue’
UK-CHINA CATCH UP: On 16 June, Huang Runqiu, head of China’s Ministry of Economy and Environment (MEE), met Ed Miliband, the UK’s secretary of state for energy and climate change, as well as Rachel Kyte, UK’s special representative for climate, in London, reported Chinese media outlet Jiemian News. The meeting was the first of a “new annual UK-China climate dialogue” announced during Miliband’s trip to China in March. The meeting has not been widely reported by major Chinese state media or English-language outlets. A short report from the MEE said the ministers discussed multilateral climate governance and “next steps” for climate cooperation. The MEE also said they had agreed to cooperate in areas such as adaptation, carbon markets, climate “investment and [private] financing” (气候投融资) and methane emissions controls.
‘NEW CLIMATE AGREEMENT’: While there was no public announcement on the event from the UK side, a government spokesperson told Carbon Brief via email: “There is no route to energy security for today’s generation without our clean energy mission, and there is no climate security and no route to keeping future generations safe without engaging global climate action. It is negligent not to engage with China on their important role in reducing global emissions.” The government email said that at the meeting, the UK had “secured a new climate agreement with China”, explaining that the two ministers “signed a new climate memorandum of understanding [MoU], setting out where both countries can work together to reduce global emissions, such as climate change mitigation and emissions reduction targets”.
‘FRANK CONVERSATIONS’: According to the UK government email, Miliband had “frank conversations” with his counterpart. It added that the new MoU offered a “forum to encourage greater action from China”, including “more ambitious targets”. It also “allows the UK and China to collaborate on…measuring and controlling methane emissions…[and] climate finance”. The inclusion of methane in the MoU “suggests the UK is looking to work with China in areas that the US previously did”, according to an individual who participated in the talks.
CHINA-EU: A few days earlier on 13 June, Huang had attended the 10th China-EU ministerial dialogue in Belgium, meeting Jessika Roswall, EU commissioner for environment, water resilience and a competitive circular economy, reported China Environment News. Huang said facing “multiple challenges in environmental and climate governance”, there is a “greater need” to strengthen cooperation between EU and China, added the outlet. The Chinese state news agency Xinhua published two articles praising the EU and China’s “green-energy” partnership as well as “green cooperation”. Meanwhile, European Commission president Ursula von der Leyen “accused Beijing of deliberately creating a near-monopoly” in the global rare-earth supply at the G7 summit in Canada on 16 June, adding that “no single country” should control 80-90% of the “raw materials and downstream products like magnets”, reported the Hong Kong-based South China Morning Post.
China’s oil demand to ‘peak in 2027’
PEAK IN 2027: Following the ongoing debate on whether China’s oil demand has already peaked, the International Energy Agency (IEA) said that it would “top out in 2027” – two years earlier than previously forecasted – “reinforcing the outlook for a global peak and prolonged supply surplus this decade”, reported Bloomberg. Japanese media outlet Nikkei Asia said “slowing demand” in China, which had accounted for 60% of oil demand growth in the world in the past decade, marked what the IEA called a “fundamental transformation” of the global energy market. However, according to Reuters, the IEA “stuck to its prediction that global [oil] demand will peak by 2029”, despite China’s more rapid transition. The news agency added that the IEA’s view “sharply contrasts with that of producer group OPEC, which says [global oil] consumption will keep growing for much longer”. In its coverage of the IEA report, the Times said China’s early peak was due to the “unexpectedly ‘breakneck’ switch to electric vehicle[s] (EVs)”. The sale of EVs surpassed more than one million in May, up 24% from a year ago, reported Reuters. China’s “trade-in” subsidies that boosted sales of EVs, however, were suspended in some cities as “funds run short and officials scrutinise the prevalence of zero-mileage used cars”, according to Bloomberg.
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ENERGY TRENDS: China’s demand for imported liquified natural gas (LNG) is expected to fall by 6-11% this year, said Reuters. This “unusual downturn” would be the first fall in three years due to “weak industrial demand and strong domestic and piped gas supply”, added the newswire. Separately, China’s thermal power output – mostly coal – grew 1.2% from a year earlier in May – the first rise since November – reported Bloomberg, attributing the rise to heatwave-induced demand and weak hydro output. Covering heavy rain that also caused floods (see below), Bloomberg reported that the “filling up” of rivers and reservoirs in central and southern China that “feed the country’s mighty dams” posed a “threat to the coal market that competes with hydropower in electricity generation”. Meanwhile, the Chinese government said that China’s overall energy intensity decreased by a cumulative 11.6% over 2021-24, reported state broadcaster CCTV. The outlet added: “This is equivalent to saving 1.4bn tonnes of standard coal and reducing carbon dioxide emissions by about 3bn tonnes.”
‘Worst flood’ and record-breaking rain
FLOODS AND HEATWAVES: The government issued its most severe “red” flood alerts for the first time this year after heavy rains in central and southern China, reported Reuters. State broadcaster CCTV said that floods “exceeding the warning level” occurred in 27 rivers across the country. Huaiji, a county in southern Guangdong province, was “hit with [the] worst flood in a century”, said state broadcaster China Global Television Network (CGTN). Record-breaking rain also fell in Hunan province in central China, affecting more than 400,000 people, reported Xinhua. About 400 ninth-grade students and 30 teachers were evacuated in Guangxi, in the south, the day before the senior high school entrance examination, said Xinhua. Meanwhile, ahead of the arrival of the first typhoon of the year, named Wutip, more than 16,000 people were transferred to safer places from “construction sites, low-lying flood-prone areas and regions at risk of flash floods” in Hainan province in south China, said Xinhua. At the same time, parts of China were hit by a “brutal heatwave”, with Xinjiang province in the northwest experiencing temperatures of up to 46.8C, according to the Guardian.
FLOOD RELIEF: About 60m yuan ($8m) were issued “to bolster flood relief efforts in Guangdong Province”, said Xinhua. In addition, the National Development and Reform Commission (NDRC), “urgently” allocated 100m yuan ($14m) to support “disaster relief work” in Guizhou, with an additional 100m yuan to Guangdong and Hunan, according to China News.
China ‘will cap’ carbon market emissions by 2030
WIDER COVERAGE: China is planning to expand the coverage of its national emissions trading scheme (ETS) to “ALL industry sectors and aviation by 2027”, according to a LinkedIn post by Yan Qin, principal analyst at consultancy firm Clearblue Markets, citing a new “high-level policy (Opinions)” document dated 24 May. The document – not seen by Carbon Brief – has been named publicly and, while its contents have not been put into the public domain, they have been “confirmed…by analysts with access to the draft”, reported Table.Briefings. In his own LinkedIn post, Lauri Myllyvirta, co-founder of the Centre for Research on Energy and Clean Air (CREA) said it was not yet clear if the expansion would only cover “main emitting sectors” – likely including the chemicals industry at a minimum, said Myllyvirta – or all industry and aviation, as Qin suggested.
CARBON CAP: According to Qin’s post, the plan would also “introduce absolute [emissions] allowance caps for sectors with stabilised emissions, starting in 2027, and [an] absolute cap for the ETS by 2030”. To date, the ETS has only covered the power sector and has lacked an absolute cap on emissions. New sectoral caps would be conditional, according to Table.Briefings, which described this flexibility as an “escape hatch”. In his post, Myllyvirta said: “The introduction of a national [ETS] cap by 2030 is in line with expectations – that’s when China’s emissions are supposed to have peaked, at the latest, and when the focus shifts from reducing carbon intensity to absolute emission cuts, in the current policy roadmap.” He added that while past slippage on ETS implementation gave “reason to be skeptical about any new timelines”, the document did “imply to me that there is a push from the top to make the ETS…relevant in China’s decarbonisation effort”.
1,084,450,000
The capacity of China’s solar-power installations – some 1.08 terawatts (TW), up 57% year-on-year – as of May 2025, according to China’s National Energy Administration (NEA) and reported by PV magazine. China added 198 gigawatts (GW) of new solar capacity in the first five months of the year, reported the Guardian, including 93GW in May alone.
Spotlight
China and the world’s climate cooperation in dilemma
A group of prominent experts of climate policy from academia, thinktanks and civil society shared their thoughts about China and climate change at the 2025 Bath Conference on China & Global Sustainability Transition earlier this week, organised by the SGAIN project at the University of Bath.
A wide range of topics – including the potential for China to show climate leadership – were discussed under the Chatham House rule. Carbon Brief outlines some of the key messages from the conference.
In an on-the-record opening keynote, Erik Solheim, former minister of climate and the environment of Norway and former executive director of the UN environment programme, said that, while European leaders currently appear to have “no time for long-term environmental problems”, China’s president Xi Jinping has been speaking a “lot more about the environment”.
Xi’s attitude was illustrated by his “two mountains” theory, said Solheim. He added that this theory – showing that “going green is not just for the environment, going green is also good for the economy” – was the “primary driver” of China’s “green transition”.
In a second on-the-record keynote, Kate Logan, director of the China climate hub and climate diplomacy at the Asia Society, said that other than the “new three” – solar panels, EVs and batteries – being a new engine of China’s economic growth, its exports of clean-energy technology have also surpassed that of “traditional energy”.
China has made major overseas climate-related investments, said Max Schmidt, a researcher from the Perspectives Climate Group, who agreed to be named despite the Chatham House rule.
Other speakers said that China’s overseas investments – both from the state and private capital – have largely shifted from infrastructure to renewable energy projects, while largely phasing out money going towards foreign coal plants.
Asked by Carbon Brief about ongoing Chinese investments in overseas coal-fired power, despite its pledge to end such activity, another speaker said that this commitment had been “by [and] large…diplomatic”. They added: “As we understood, it does not apply to what has already been in the pipeline.”
China’s role in the new international climate-finance goal agreed at COP29 in Baku, Azerbaijan last year. One speaker said:
“Strategically, we promote cooperation…[and] multilateralism…[But] if [the developed countries] say China needs to provide public [climate] funds, fill[ing] the gap left by the US, these prominent [Chinese climate] negotiators will definitely say no.”
Another speaker said that talks on climate finance between the UK and China have not been “very productive”.
The person said China urged developed countries, including the UK, to increase their climate finance, while the UK urged China to “count their south-south climate support towards the [international] climate finance goal”.
“Neither side wants to budge, so there has been little progress and it is unclear how the gap left by the US will be filled,” added the person.
In answering Carbon Brief’s question on how to move things forward, one speaker said:
“Stop trying to set any formal obligations for China…Instead, set an open-ended opportunity…Keep China happy and you will see…a lot of donations…That’s my understanding of dealing with the government for so many years.”
Addressing recent security concerns over China’s clean-energy exports, a speaker suggested that in an ideal world, the UK would have a “list” of products that it “welcomes” from China.
However, complex clean-energy products containing many components, such as EVs, present “huge grey areas”, which are “in the middle” and are likely to have to be decided on a “case-by-case basis” due to the uncertainty involved, added the speaker.
In the US, meanwhile, “climate conversations” were being “disrupted” by another factor – the supply of critical minerals amid geopolitical concerns – according to a different speaker, who said this was intensified by China “leapfrogg[ing]” in the EV industry.
Another speaker said that critical minerals were being “politicalised”, in part because of the different ways they are used in each country.
The speaker said that critical minerals had a wide range of uses. For the US they were mainly used in semiconductors, petrochemicals and defence, whereas China also used them in EVs and wind turbines, they explained.
Speaking to Carbon Brief on the sidelines of the event, Dr Yixian Sun, who leads the SGAIN project, said that the rest of the world could take “useful lessons” from China’s efforts towards sustainable development. He added:
“To keep the 1.5C goal alive, stronger international cooperation is urgently needed – to help China deepen its own transition and [to] develop inclusive partnerships with the rest of the world.”
Watch, read, listen
EMISSIONS PEAKED?: Bloomberg’s “Zero” podcast interviewed CREA’s Myllyvirta, about whether China’s emissions have “finally peaked”, citing his analysis for Carbon Brief.
‘GREEN DEVELOPMENT’: Prof Bai Quan, from the Academy of Macroeconomic Research (AMR) under China’s National Development and Reform Commission (NDRC), who Carbon Brief interviewed last year, published an article about “green development” at state-run media outlet Economic Daily.
INDUSTRY MITIGATION: Prof He Kebin, dean of the Institute for Carbon Neutrality at Tsinghua University, gave a talk about “industrial decarbonisation”, reported China Energy Net.
‘NATIONAL LOW-CARBON DAY’: A short video promoting combating climate change for China’s “national low-carbon day” (25 June) was produced and published by the MEE.
New science
Persistent emissions of ozone-depleting carbon tetrachloride from China during 2011–2021
Nature Geoscience
China was responsible for half of the world’s emissions of the ozone-depleting greenhouse gas carbon tetrachloride over 2011-20, according to new research. The paper used both long-term atmospheric observations from a network of sites from across China and a “top-down approach” to estimate the country’s carbon tetrachloride emissions. The authors noted that “substantial” carbon tetrachloride emissions are permitted for feedstock use in China, but still found thousands of tonnes of “unexplained” carbon tetrachloride emissions from the country per year.
Agricultural and Forest Meteorology
The extreme heatwave and drought in North China in 2022-23 caused more than 80,000 hectares of forest canopy dieback, a new study found. The researchers used remote sensing forest monitoring algorithms and drone-captured images to identify forest canopy dieback during this period. The most severe dieback occurred in May 2023, they found. Areas with high forest cover were hardest hit in the early stages of the extreme weather, which suggests that “afforestation efforts may have inadvertently increased forest vulnerability”, the study authors wrote. They added that this extreme weather event was “highly severe, widespread, and prolonged, causing historically low anomalies in regional greenness and productivity”.
China Briefing is compiled by Wanyuan Song and Anika Patel. It is edited by Wanyuan Song and Dr Simon Evans. Please send tips and feedback to china@carbonbrief.org
The post China Briefing 26 June 2025: First UK-China climate dialogue; China-climate conference summary; Oil peak ‘in 2027’ appeared first on Carbon Brief.
N.C. Gov. Josh Stein wants state lawmakers to rethink tax breaks for data centers. The industry’s opacity makes it difficult to evaluate costs and benefits.
Tax breaks for data centers in North Carolina keep as much as $57 million each year into from state and local government coffers, state figures show, an amount that could balloon to billions of dollars if all the proposed projects are built.
The Global Environment Facility (GEF), a multilateral fund that provides climate and nature finance to developing countries, has raised $3.9 billion from donor governments in its last pledging session ahead of a key fundraising deadline at the end of May.
The amount, which is meant to cover the fund’s activities for the next four years (July 2026-June 2030), falls significantly short of the previous four-year cycle for which the GEF managed to raise $5.3bn from governments. Since then, military and other political priorities have squeezed rich nations’ budgets for climate and development aid.
The facility said in a statement that it expects more pledges ahead of the final replenishment package, which is set for approval at the next GEF Council meeting from May 31 to June 3.
Claude Gascon, interim CEO of the GEF, said that “donor countries have risen to the challenge and made bold commitments towards a more positive future for the planet”. He added that the pledges send a message that “the world is not giving up on nature even in a time of competing priorities”.
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UK imports of “green” jet fuel linked to Amazon deforestation
A Texas refinery shipping sustainable aviation fuel to Europe has sourced beef tallow with links to a meatpacking firm fined over illegal cattle purchases -
Italy pushes coal exit back after gas prices rise
Analysts say the move sends a negative signal, but its impact will be limited given coal’s marginal role in Italy’s energy mix
Donors under pressure
But Brian O’Donnell, director of the environmental non-profit Campaign for Nature, said the announcement shows “an alarming trend” of donor governments cutting public finance for climate and nature.
“Wealthy nations pledged to increase international nature finance, and yet we are seeing cuts and lower contributions. Investing in nature prevents extinctions and supports livelihoods, security, health, food, clean water and climate,” he said. “Failing to safeguard nature now will result in much larger costs later.”
At COP29 in Baku, developed countries pledged to mobilise $300bn a year in public climate finance by 2035, while at UN biodiversity talks they have also pledged to raise $30bn per year by 2030. Yet several wealthy governments have announced cuts to green finance to increase defense spending, among them most recently the UK.
As for the US, despite Trump’s cuts to international climate finance, Congress approved a $150 million increase in its contribution to the GEF after what was described as the organisation’s “refocus on non-climate priorities like biodiversity, plastics and ocean ecosystems, per US Treasury guidance”.
The facility will only reveal how much each country has pledged when its assembly of 186 member countries meets in early June. The last period’s largest donors were Germany ($575 million), Japan ($451 million), and the US ($425 million).
The GEF has also gone through a change in leadership halfway through its fundraising cycle. Last December, the GEF Council asked former CEO Carlos Manuel Rodriguez to step down effective immediately and appointed Gascon as interim CEO.
Santa Marta conference: fossil fuel transition in an unstable world
New guidelines
As part of the upcoming funding cycle, the GEF has approved a set of guidelines for spending the $3.9bn raised so far, which include allocating 35% of resources for least developed countries and small island states, as well as 20% of the money going to Indigenous people and communities.
Its programs will help countries shift five key systems – nature, food, urban, energy and health – from models that drive degradation to alternatives that protect the planet and support human well-being by integrating the value of nature into production and consumption systems.
The new priorities also include a target to allocate 25% of the GEF’s budget for mobilising private funds through blended finance. This aligns with efforts by wealthy countries to increase contributions from the private sector to international climate finance.
Niels Annen, Germany’s State Secretary for Economic Cooperation and Development, said in a statement that the country’s priorities are “very well reflected” in the GEF’s new spending guidelines, including on “innovative finance for nature and people, better cooperation with the private sector, and stable resources for the most vulnerable countries”.
Aliou Mustafa, of the GEF Indigenous Peoples Advisory Group (IPAG), also welcomed the announcement, adding that “the GEF is strengthening trust and meaningful partnerships with Indigenous Peoples and local communities” by placing them at the “centre of decision-making”.
The post GEF raises $3.9bn ahead of funding deadline, $1bn below previous budget appeared first on Climate Home News.
GEF raises $3.9bn ahead of funding deadline, $1bn below previous budget
Tropical cyclones that rapidly intensify when passing over marine heatwaves can become “supercharged”, increasing the likelihood of high economic losses, a new study finds.
Such storms also have higher rates of rainfall and higher maximum windspeeds, according to the research.
The study, published in Science Advances, looks at the economic damages caused by nearly 800 tropical cyclones that occurred around the world between 1981 and 2023.
It finds that rapidly intensifying tropical cyclones that pass near abnormally warm parts of the ocean produce nearly double – 93% – the economic damages as storms that do not, even when levels of coastal development are taken into account.
One researcher, who was not involved in the study, tells Carbon Brief that the new analysis is a “step forward in understanding how we can better refine our predictions of what might happen in the future” in an increasingly warm world.
As marine heatwaves are projected to become more frequent under future climate change, the authors say that the interactions between storms and these heatwaves “should be given greater consideration in future strategies for climate adaptation and climate preparedness”.
‘Rapid intensification’
Tropical cyclones are rapidly rotating storm systems that form over warm ocean waters, characterised by low pressure at their cores and sustained winds that can reach more than 120 kilometres per hour.
The term “tropical cyclones” encompasses hurricanes, cyclones and typhoons, which are named as such depending on which ocean basin they occur in.
When they make landfall, these storms can cause major damage. They accounted for six of the top 10 disasters between 1900 and 2024 in terms of economic loss, according to the insurance company Aon’s 2025 climate catastrophe insight report.
These economic losses are largely caused by high wind speeds, large amounts of rainfall and damaging storm surges.
Storms can become particularly dangerous through a process called “rapid intensification”.
Rapid intensification is when a storm strengthens considerably in a short period of time. It is defined as an increase in sustained wind speed of at least 30 knots (around 55 kilometres per hour) in a 24-hour period.
There are several factors that can lead to rapid intensification, including warm ocean temperatures, high humidity and low vertical “wind shear” – meaning that the wind speeds higher up in the atmosphere are very similar to the wind speeds near the surface.
Rapid intensification has become more common since the 1980s and is projected to become even more frequent in the future with continued warming. (Although there is uncertainty as to how climate change will impact the frequency of tropical cyclones, the increase in strength and intensification is more clear.)
Marine heatwaves are another type of extreme event that are becoming more frequent due to recent warming. Like their atmospheric counterparts, marine heatwaves are periods of abnormally high ocean temperatures.
Previous research has shown that these marine heatwaves can contribute to a cyclone undergoing rapid intensification. This is because the warm ocean water acts as a “fuel” for a storm, says Dr Hamed Moftakhari, an associate professor of civil engineering at the University of Alabama who was one of the authors of the new study. He explains:
“The entire strength of the tropical cyclone [depends on] how hot the [ocean] surface is. Marine heatwave means we have an abundance of hot water that is like a gas [petrol] station. As you move over that, it’s going to supercharge you.”
However, the authors say, there is no global assessment of how rapid intensification and marine heatwaves interact – or how they contribute to economic damages.
Using the International Best Track Archive for Climate Stewardship (IBTrACS) – a database of tropical cyclone paths and intensities – the researchers identify 1,600 storms that made landfall during the 1981-2023 period, out of a total of 3,464 events.
Of these 1,600 storms, they were able to match 789 individual, land-falling cyclones with economic loss data from the Emergency Events Database (EM-DAT) and other official sources.
Then, using the IBTrACS storm data and ocean-temperature data from the European Centre for Medium-Range Weather Forecasts, the researchers classify each cyclone by whether or not it underwent rapid intensification and if it passed near a recent marine heatwave event before making landfall.
The researchers find that there is a “modest” rise in the number of marine heatwave-influenced tropical cyclones globally since 1981, but with significant regional variations. In particular, they say, there are “clear” upward trends in the north Atlantic Ocean, the north Indian Ocean and the northern hemisphere basin of the eastern Pacific Ocean.
‘Storm characteristics’
The researchers find substantial differences in the characteristics of tropical cyclones that experience rapid intensification and those that do not, as well as between rapidly intensifying storms that occur with marine heatwaves and those that occur without them.
For example, tropical cyclones that do not experience rapid intensification have, on average, maximum wind speeds of around 40 knots (74km/hr), whereas storms that rapidly intensify have an average maximum wind speed of nearly 80 knots (148km/hr).
Of the rapidly intensifying storms, those that are influenced by marine heatwaves maintain higher wind speeds during the days leading up to landfall.
Although the wind speeds are very similar between the two groups once the storms make landfall, the pre-landfall difference still has an impact on a storm’s destructiveness, says Dr Soheil Radfar, a hurricane-hazard modeller at Princeton University. Radfar, who is the lead author of the new study, tells Carbon Brief:
“Hurricane damage starts days before the landfall…Four or five days before a hurricane making landfall, we expect to have high wind speeds and, because of that high wind speed, we expect to have storm surges that impact coastal communities.”
They also find that rapidly intensifying storms have higher peak rainfall than non-rapidly intensifying storms, with marine heatwave-influenced, rapidly intensifying storms exhibiting the highest average rainfall at landfall.
The charts below show the mean sustained wind speed in knots (top) and the mean rainfall in millimetres per hour (bottom) for the tropical cyclones analysed in the study in the five days leading up to and two days following a storm making landfall.
The four lines show storms that: rapidly intensified with the influence of marine heatwaves (red); those that rapidly intensified without marine heatwaves (purple); those that experienced marine heatwaves, but did not rapidly intensify (orange); and those that neither rapidly intensified nor experienced a marine heatwave (blue).
Dr Daneeja Mawren, an ocean and climate consultant at the Mauritius-based Mascarene Environmental Consulting who was not involved in the study, tells Carbon Brief that the new study “helps clarify how marine heatwaves amplify storm characteristics”, such as stronger winds and heavier rainfall. She notes that this “has not been done on a global scale before”.
However, Mawren adds that other factors not considered in the analysis can “make a huge difference” in the rapid intensification of tropical cyclones, including subsurface marine heatwaves and eddies – circular, spinning ocean currents that can trap warm water.
Dr Jonathan Lin, an atmospheric scientist at Cornell University who was also not involved in the study, tells Carbon Brief that, while the intensification found by the study “makes physical sense”, it is inherently limited by the relatively small number of storms that occur. He adds:
“There’s not that many storms, to tease out the physical mechanisms and observational data. So being able to reproduce this kind of work in a physical model would be really important.”
Economic costs
Storm intensity is not the only factor that determines how destructive a given cyclone can be – the economic damages also depend strongly on the population density and the amount of infrastructure development where a storm hits. The study explains:
“A high storm surge in a sparsely populated area may cause less economic damage than a smaller surge in a densely populated, economically important region.”
To account for the differences in development, the researchers use a type of data called “built-up volume”, from the Global Human Settlement Layer. Built-up volume is a quantity derived from satellite data and other high-resolution imagery that combines measurements of building area and average building height in a given area. This can be used as a proxy for the level of development, the authors explain.
By comparing different cyclones that impacted areas with similar built-up volumes, the researchers can analyse how rapid intensification and marine heatwaves contribute to the overall economic damages of a storm.
They find that, even when controlling for levels of coastal development, storms that pass through a marine heatwave during their rapid intensification cause 93% higher economic damages than storms that do not.
They identify 71 marine heatwave-influenced storms that cause more than $1bn (inflation-adjusted across the dataset) in damages, compared to 45 storms that cause those levels of damage without the influence of marine heatwaves.
This quantification of the cyclones’ economic impact is one of the study’s most “important contributions”, says Mawren.
The authors also note that the continued development in coastal regions may increase the likelihood of tropical cyclone damages over time.
Towards forecasting
The study notes that the increased damages caused by marine heatwave-influenced tropical cyclones, along with the projected increases in marine heatwaves, means such storms “should be given greater consideration” in planning for future climate change.
For Radfar and Moftakhari, the new study emphasises the importance of understanding the interactions between extreme events, such as tropical cyclones and marine heatwaves.
Moftakhari notes that extreme events in the future are expected to become both more intense and more complex. This becomes a problem for climate resilience because “we basically design in the future based on what we’ve observed in the past”, he says. This may lead to underestimating potential hazards, he adds.
Mawren agrees, telling Carbon Brief that, in order to “fully capture the intensification potential”, future forecasts and risk assessments must account for marine heatwaves and other ocean phenomena, such as subsurface heat.
Lin adds that the actions needed to reduce storm damages “take on the order of decades to do right”. He tells Carbon Brief:
“All these [planning] decisions have to come by understanding the future uncertainty and so this research is a step forward in understanding how we can better refine our predictions of what might happen in the future.”
The post Marine heatwaves ‘nearly double’ the economic damage caused by tropical cyclones appeared first on Carbon Brief.
Marine heatwaves ‘nearly double’ the economic damage caused by tropical cyclones
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