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China Briefing handpicks and explains the most important climate and energy stories from China over the past fortnight. Subscribe for free here.
Key developments
Tariffs and trade restrictions
US BAN: China has placed an export ban on shipments to the US of gallium, germanium and antimony, plus further restricted exports of certain types of graphite to the country, in a “rapid retaliation by Beijing against new export controls from Washington”, the Financial Times said. It added that “the immediate impact of the measures was unclear, given that the US had been diversifying its supply chains”. Analysis by Carbon Brief found that previous country-agnostic export controls on the minerals, all of which are used in low-carbon technologies, had a limited impact on supply chains, with Chinese exports either resuming after a short dip or remaining stable. Analysis by consultancy Trivium China stated that one of China’s motives with the ban could be to “warn the incoming Trump administration” against “ramping up economic and trade pressure”.
SOLAR TARIFFS: Meanwhile, the US has also imposed a “new round of tariffs on solar panel imports” from Malaysia, Cambodia, Vietnam and Thailand, following accusations by a US industry lobby of Chinese-owned factories in the four nations “dumping products into the [global] market”, Reuters reported. In response, China’s commerce ministry expressed its “concern over the US’ intention to politicise and weaponise trade investigations”, the state-run newspaper China Daily said. It cited a commerce ministry spokesperson saying that Chinese solar companies in southeast Asia have made “positive contributions to the local economic and social development”. Another Reuters article noted that Malaysia has “urged” Chinese companies not to use it “as a base to rebadge products to avoid US tariffs”.
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CHINA ‘HAWK’: On 6 December, president-elect Donald Trump nominated China “hawk” senator David Perdue for US ambassador to China, BBC News reported. Perdue wrote in the Washington Examiner in September 2024: “China continues to laugh at US attempts to partner with it on climate change…We should withdraw from the Paris climate agreement, as it commits the US to fund it primarily while giving China a free pass.”
CONTENT REQUIREMENTS: Meanwhile, according to Nikkei Asia, the EU is “adding restrictions to its [European Hydrogen Bank] subsidy program for ‘green’ hydrogen production that effectively lock out Chinese-made equipment” by stating that projects “will not be eligible if electrolyser stacks…sourced from China account for more than 25% of output capacity”. The Financial Times reported that the EU’s new €4.6bn tender for “technologies for decarbonisation” will only be accessible to Chinese companies that “agree to transfer intellectual property rights to the EU”, according to Teresa Ribera, the EU’s new executive vice president for a “clean, just and competitive transition”.
Carbon concentrations reporting
CLIMBING CO2: The amount of carbon dioxide (CO2) in the atmosphere above China’s land area rose in 2023, reaching approximately 421 parts per million (ppm), according to the country’s newly released greenhouse gas bulletin for 2023, reported the Communist party-affiliated newspaper People’s Daily. This rise of 2.3ppm was “slightly lower” than the average annual growth in concentrations of 2.4ppm over the past decade, the newspaper added. The 21st Century Herald, a business newspaper, also covered the bulletin’s launch, noting that the average concentrations of methane and nitrous oxide in 2023 rose year-on-year at a rate “lower than the global [average]”.
EXPERT WARNING: Separately, a new report found that, “while the civil sector has achieved significant synergistic emission reductions of CO2 and air pollutants”, the power and heating sectors are seeing “dual-growth” of carbon emissions and air pollution, while the emissions reductions of industry and transport “need to be further unleashed”, finance newspaper the Economic Daily reported. The study, released by the China Clean Air Policy Partnership – a consortium of leading universities, government-linked research institutes, industry associations and other stakeholders – assesses the “challenges China faces on the road to carbon neutrality and clean air synergy and proposes solutions”, current affairs news outlet China News said. It quoted professor He Kebin, dean of the Tsinghua University Institute for Carbon Neutrality, saying at the launch event that the upcoming shift from “dual-control of energy” to “dual-control of carbon” marks a “critical period” in China’s “green transformation”.
WEATHER IMPACT: Meanwhile, China “reported its warmest autumn this year since records began”, with average temperatures standing at “1.5C higher than the average year”, Agence-France Presse said. Scientists in China are searching for ways to develop climate-resilient potatoes – given the plants are “particularly vulnerable to heat” – in order to “protect [the country’s] food supplies”, Reuters reported. Also, “continued rains followed by extreme high temperatures” have severely damaged China’s kiwi harvest, according to Bloomberg.
Grid reform efforts continue
UNIFIED GRID: The China Electricity Council (CEC) launched a “blue book” – the term used for research reports or policy proposals issued by government departments or government-affiliated organisations – outlining a “strategic roadmap for future development” of a national unified power market, industry news outlet International Energy Net reported. It quoted a deputy director of the National Energy Administration (NEA) saying a unified power market is crucial for “deepening power sector reforms” and promoting the energy transition. Energy news outlet BJX News also covered the document’s release, which outlined a timetable for the plan: namely, that “preliminary construction [of a unified market] will be completed in 2025, full construction will be completed in 2029, and improvements and upgrading will be completed in 2035”. It added that key elements of the plan include “convergence” of provincial mechanisms, “participation” of large-scale renewable energy bases and “market adaptation” to the energy transition.
GREEN GRID: Separately, the CEC also reported that China’s electrification rate – the share of energy demand met by electricity – was “expected to reach 34% by 2030”, financial news outlet Yicai reported. Separately, China will “set another record” for solar capacity growth this year, with new installations expected to climb from last year’s 217 gigawatts (GW) to reach 230-260GW in 2024, according to an announcement by the China Photovoltaic Industry Association covered by Bloomberg. In addition, China’s installed wind capacity has exceeded 500 gigawatts (GW) and now accounts for 50% of the global total, state broadcaster CCTV reported.
STABLE GRID: The NEA released guiding opinions that aim to “clarify the scope of new businesses” in the energy sector and “facilitate [their] connection to the grid and operation”, following the rapid expansion of China’s renewable energy sector, an NEA official told International Energy Net. Finance newspaper Securities Times quoted Lin Boqiang, dean of the China Energy Policy Research Institute at Xiamen University, saying the new rules “aim to lessen pressure on the grid and ensure safe and stable operation of the power system”.
‘Green growth’ at the fore of key economic meeting
XI’S ‘KEY TASKS’: President Xi Jinping told policymakers that “synergistically promoting carbon reduction, pollution reduction and green growth” was one of nine “key tasks” for 2025 at the central economic work conference (CEWC), an annual high-level economic policy meeting that ended on 12 December, Xinhua reported. The state news agency added that Xi’s speech underscored the need to “step up the overall green transformation of economic and social development” and “deepen reform of the ecological civilisation system”, in part by creating a “healthy ecosystem” for low-carbon industries and “cultivating new growth points, such as green buildings”. It said the speech also mentioned that China will “establish a number of zero-carbon parks, promote the construction of a national carbon market, and establish a product carbon footprint management system and a carbon labelling certification system”. These themes had been raised in a meeting of the Politburo, the decision-making body of the Chinese communist party, a few days prior, according to China Daily.
GROWING PAINS: The CEWC meeting included “pledges to take a more proactive approach” in stimulating economic growth, “but gave no details on new stimulus measures”, the Associated Press reported, adding that China would “raise its fiscal deficit”, “stabilise the property market” and “boost consumer spending”. The International Energy Agency “lifted next year’s oil-demand estimates” in response to the anticipated “impact of China’s stimulus measures”, although it added “the pace of growth is expected to remain subdued”, the Wall Street Journal said. Reuters reported that “Chinese leaders signalled…they are ready to deploy whatever stimulus is needed to counter the impact of expected US trade tariffs on next year’s economic growth”, adding that the exact size of the stimulus will “depend on” the Trump administration’s tariffs and other policy measures against China.
HIGH-QUALITY GROWTH: China is “planning a fresh set of policies to propel growth in the equipment manufacturing sector, focusing on nurturing new growth engines such as new energy vehicles”, China Daily said, in tandem with calls from the CEWC and Politburo meetings to “nurture technological innovation”. A China Daily editorial argued that “Chinese policymakers are exercising tremendous prudence” to minimise risks and uncertainties while pursuing “new quality productive forces and innovation”.
Spotlight
How China’s renewables rollout boosts its ‘war on sand’
At the ongoing COP16 UN summit on desertification in Riyadh, Saudi Arabia, Carbon Brief hears from experts on the links between China’s rapidly expanding desert solar farms and Beijing’s decades-long efforts to keep sand in check.
China’s effort to build large solar power “bases” in and around the desert is a major part of its current renewable plan.
The initiative, which has expanded rapidly in the country’s arid north and northwest, is also part of its campaign to combat desertification, an issue increasingly exacerbated by climate change.
For more than four decades, Beijing has been trying to prevent sand from degrading its land with an afforestation programme called the “Three-North Shelterbelt” (三北防护林).
Over the past two years, the programme – described as China’s “war on sand” by the media – has been boosted by the development of large-scale solar bases in far-flung regions, such as Xinjiang and Inner Mongolia.
Installing solar panels in the desert can not only generate power, but also help prevent sand dunes from moving, according to Dr He Jijiang, executive deputy director of the Research Center for Energy Transition and Social Development at Tsinghua University, Beijing.
Energy companies’ investments also provide financial support to many regions’ sand-control campaigns – an apparent obstacle in the past – Dr He told Carbon Brief at a side event in the China pavilion at the ongoing COP16 talks.
Taming of the sand
China is one of the worst-hit countries by desertification, which essentially means land degradation in dry lands.
Nearly 18% of China’s landmass – roughly seven times the size of the UK – is affected by the issue, according to statistics reported by Guan Zhi’ou, director of China’s National Forestry and Grassland Administration and the head of the Chinese delegation to COP16, in November.
China’s effort to combat desertification has a strong link with its – and the world’s – climate actions.
Soil is the second largest natural carbon sink on Earth after oceans and stores a large amount of carbon. When land degrades, not only does it lose the ability to store as much carbon, it can also release carbon into the atmosphere, driving further climate change.
On the other hand, climate change accelerates land degradation and China is on the front line. The country has seen the largest total area shift from non-dryland into drylands over the past three decades, according to a major scientific report published by the UNCCD at COP16.
Since the introduction of the Three-North Shelterbelt programme in 1978, China has adopted a series of measures to fight desertification, from planting sand-blocking vegetation to laying straw on the ground in the shape of checkerboards to prevent its vast deserts from expanding.
Solar solution
China’s plan for renewable energy from 2021 to 2025 calls for the “large-scale development” of its sand-plus-solar anti-desertification method.
The concept centres around managing arid areas via building and maintaining solar farms. It stems from years of experience accumulated by Chinese solar developers, which have built solar farms in the desert for more than a decade – with varying degrees of success.
“Building solar farms needs a lot of space. China has vast deserts, so [companies] wanted to take advantage of it,” Dr He explained.
But to operate solar farms in such harsh conditions, these companies must first take various protective measures – and these measures helped combat desertification, too.
For example, companies need to put up fences around their solar farms to stop animals from entering, install anti-dust nets to prevent sand from gathering on equipment and make straw checkerboards around their bases to prevent nearby sand dunes from shifting, Dr He said.
Solar panels also bring benefits to the ground underneath. For example, they can reduce water evaporation by blocking out direct sunshine, according to Dr Chen Siyu, a professor at the college of atmospheric sciences at Lanzhou University in Lanzhou, a city situated on the edge of the Gobi desert in China.
Solar panels can “significantly increase” the soil moisture of dry regions and, therefore, help plants to grow, Dr Chen told Carbon Brief. A 2021 study conducted in northwest China projected that the soil moisture would increase by up to 113.6% when it is sheltered.
“Solar panels can also form a natural barrier, helping to shed wind speed and prevent dust storms from occurring and spreading,” she said.
Ramping up transition
The construction of solar farms also injects financial support to many regions’ sand-control campaigns, providing incentives for them to carry on, Dr He noted.
“In the past, planting trees only brought ecological benefits, not economic returns,” he said. “Now, if a company wants to build a solar power station, it needs to cover all related costs, from hiring equipment to growing plants.”
Ramping up the solar-plus-sand method can scale up China’s renewable deployment, as well as improving soil conditions by bringing greenery, vegetable plots and livestock to the desert and barren land. Because of this, dryland has become “a type of resource”, Dr He said.
This Spotlight is by freelance climate journalist Xiaoying You for Carbon Brief. A full-length version of the article is available on the Carbon Brief website.
Watch, read, listen
LOW-BALLING: Chinese climate envoy Liu Zhenmin, in a lengthy interview with China Newsweek, reflected on the “disappoint[ing]” $300bn finance goal and pushed back against questions of China “playing a stronger leadership role” in climate negotiations.
LOOKING AHEAD: The Asia Society Policy Institute wrote that, against the backdrop of an economic slowdown, China’s international climate pledge next year, coal trajectory and renewables buildout are “key things to watch” in a forecast for 2025.
PUTIN’S PIPELINE: State news agency Xinhua visited a hub of the recently completed China-Russia east-route gas pipeline to explore how it supplies Shanghai and other eastern provinces.
TRUMP EFFECT: A podcast by the Oxford Institute for Energy Studies discussed how the next Trump administration’s China policy could affect China’s own energy activities and climate action.
17%
The share of China’s greenhouse gas emissions produced by the steel industry, according to Reuters. The newswire added that China has published draft rules for comment on greenhouse gas emissions reporting for steel-makers, in preparation for the industry’s entry into the national emissions trading scheme.
New science
Global and Planetary Change
Compound drought and hot extremes (CDHEs) will increase across many regions of China over the coming century, especially in the eastern and central Songnen Plain and northern Sichuan Basin, a new study found. The authors evaluated changes in CDHEs across multiple croplands in China between 1961-2010 and 2031-80, using a large ensemble model, rainfall data and temperature data. “These results underscore the high risk of the spatial compounding of extremes at multiple croplands in China in the future,” the study said.
Impact of computing infrastructure on carbon emissions in China
Scientific Reports
A new paper found an upside-down “U” shaped relationship between carbon emission intensity – the emissions per unit of economic output – and computing infrastructure in Chinese cities, with emissions intensity initially increasing with a rise in computing infrastructure, before plateauing and then decreasing. The authors used data from 279 prefecture-level cities collected between 2008 to 2021. The findings are “particularly pronounced in central regions, hub cities and moderately digitally developed cities”, they said.
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 12 December 2024: Export controls; Carbon concentration figures; ‘War on sand’ appeared first on Carbon Brief.
China Briefing 12 December 2024: Export controls; Carbon concentration figures; ‘War on sand’
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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