Welcome to Carbon Brief’s Cropped.
We handpick and explain the most important stories at the intersection of climate, land, food and nature over the past fortnight.
This is an online version of Carbon Brief’s fortnightly Cropped email newsletter. Subscribe for free here.
Key developments
The road to COP28
PROGRESS ON PLEDGES: Climate Home News examined the progress towards the climate pledges made at COP26 in Glasgow two years ago. Nearly 50 additional countries have signed a pledge to reduce their methane emissions by 30% by 2030, bringing the total to 150 countries. However, these countries only constitute half of global methane emissions and “under current trajectories, total human-made methane emissions could rise by up to 13%” over 2020-30. Another major pledge in Glasgow was the forest pledge to halt and reverse deforestation by 2030, signed by more than 140 countries. Countries “remain off track to reach the goal of the Glasgow pledge”, Climate Home News wrote. In 2022, tree loss was 21% higher than the required level to achieve zero deforestation in seven years, according to an assessment carried out by several non-governmental organisations.
DECARBONISING FOOD: Ahead of COP28, the Global Alliance for the Future of Food and Dalberg Advisors, a global consultancy focused on sustainability, published two reports looking at the links between food systems and fossil fuels. The Alliance called on stakeholders from the food and energy industries to collaborate to break the bond between the food sector and fossil fuels and transform the food sector to a more sustainable one that is in line with the Paris Agreement. One of the reports laid out the relationships between food and energy systems and provided recommendations to decarbonise the food sector. For example, it said, food producers could start reducing their use of fossil-fuel-based agrochemicals and move to agroecological and regenerative systems.
FOOD FOCUS: A group of more than 80 organisations and individuals, including Unilever, WWF and Columbia Climate School, issued a joint open letter addressed to the UN Framework Convention on Climate Change to demand that food systems be at the centre of negotiations at COP28, reported the UK trade publication Food Manufacture. The organisations pointed out that joint action is required to solve climate change, biodiversity loss and food insecurity. The signatories also asked that National Adaptation Plans and Nationally Determined Contributions include food systems. The letter argued that doing so will encourage countries to create national policies to reduce food waste and move to more sustainable and healthy diets.
Hidden costs of food systems
HIDDEN FIGURES: The UN Food and Agriculture Organization (FAO) found that the “hidden costs” of food systems amount to “at least” $10tn per year, or nearly 10% of total global GDP. The latest edition of its annual State of Food and Agriculture report focused on “true-cost accounting” – tallying up the environmental, health and social costs and benefits of the world’s food systems. According to the FAO, unsustainable food systems are contributing to “climate change, natural resource degradation and the unaffordability of healthy diets”. Based on an assessment of more than 150 countries’ food systems, the report found “that low-income countries bear the highest burden of the hidden costs of agrifood systems relative to national income” – up to one-quarter of their GDP, as compared to just 12% for middle-income countries and less than 8% for high-income countries.
ENVIRONMENTAL UNDERESTIMATE: Of the total sum, more than 70% of the hidden costs are “driven by unhealthy diets”, leading to “non-communicable diseases and causing labour productivity losses”, the FAO wrote in a press release, adding that the costs of these health impacts primarily affected higher-income countries. About 20% of the costs are environmental: greenhouse gas emissions, nitrogen emissions, land-use change and water use. The press release noted that the scale of environmental costs “is probably underestimated due to data limitations”. FAO director-general Qu Dongyu said: “The future of our agrifood systems hinges on our willingness to appreciate all food producers, big or small, to acknowledge these true costs and understand how we all contribute to them and what actions we need to take.” Governments should factor in these true costs “to transform agrifood systems”, the FAO added. Next year’s report will also focus on true-cost accounting, the FAO said.
INTERCONNECTED COSTS: Dr David Laborde, head of agrifood economics at the FAO, told Wired: “With this report, we can put a price tag on these problems [facing our agrifood systems].” Wired wrote that “hidden costs can be interconnected”, using the example of cacao – where farmers in low-income countries “are often paid a pittance for their crops”, while over-consumption of chocolate in higher-income countries can lead to negative health outcomes there. Jack Bobo, the director of the Food Systems Institute at the University of Nottingham, told Wired that the cross-border calculations required for true-cost accounting “can get fiendishly complicated”. Bobo said: “If you export your environmental footprint to the most biodiverse countries on the planet, you may not have a more sustainable system…There’s not one perfect system.”
DRC controversy
OIL AND GAS BLOCKS: A company chosen by the Democratic Republic of the Congo for a “technically complex project” to extract gas from Lake Kivu, a large lake located on the DRC-Rwanda border, did not meet the financial criteria in its proposal, an investigation by the Bureau of Investigative Journalism (TBIJ) and Reuters found. Alfajiri Energy, a Canadian start-up, was selected last month to extract methane from Lake Kivu – described as a “killer lake” due to its risk of a toxic, deadly eruption. The DRC’s decision to auction off land for oil and gas exploration, announced last year, has been “plagued with apparent preferential treatment and backroom deals”, TBIJ said.
BIDDING WARS: A 2022 report seen by Reuters and TBIJ said that Alfajiri Energy “lacked vital information, such as a work plan or feasibility study” and scored lowest out of three companies applying for the contract. The same experts involved in this report later made a “remarkable U-turn” in a second report, which “reposition[ed] Alfajiri as the highest-scoring bidder”, TBIJ said. Reuters noted: “The auction, which took place last year, was the first of its kind to be conducted in [the DRC] under a law from 2015 that was designed to promote transparency in the oil and gas sector.”
RESPONSE: Reuters said that the DRC’s hydrocarbons minister, Didier Budimbu, denied any problems with the tender process, adding in a text message: “The process was very transparent and it will remain so. I will make sure of it.” He told TBIJ that he maintains transparent relations with all potential investors in the tendering process, reassuring them that the DRC is “now the destination for those who want to seize the opportunity to do business”. Reuters said the DRC president’s office declined to comment. Alfajiri’s founder and chief executive, Christian Hamuli, called the process “rigorous, transparent and credible”, Reuters said. Hamuli told TBIJ that Alfajiri has “highly qualified and experienced professionals with integrity” who are capable of developing the Lake Kivu project in a secure manner.
THREE BASINS: Elsewhere in Central Africa, tropical forest countries from across three continents agreed to work together to finance and protect their ecosystems, but failed to firm up a unified alliance at a summit in the Republic of the Congo late last month. Carbon Brief reported the key outcomes of the Three Basins Summit, which were described as ”underwhelming” by one observer. The final declaration, agreed between countries located in the tropical forest basins of the Amazon, the Congo and the Borneo-Mekong, “fails to commit to any concrete actions for the protection and restoration of nature”, according to a statement by Greenpeace. But an observer told Carbon Brief it might “inform policies and strategies at COP28”.
News and views
NO OLIVE BRANCH: Some 40,000 olive trees and hundreds of square kilometres of land have been burned in southern Lebanon in “fires caused by Israeli shelling” since last month, Reuters reported. More than 130 fires have been recorded by the agricultural ministry. The olive harvest has not happened yet, meaning that farmers are losing this year’s harvest in addition to the trees themselves. More than 110,000 farmers and growers in Lebanon rely on olive trees for their income, Reuters added. Lebanon’s agricultural minister, Abbas Hajj Hassan, told the newswire: “People are connected to olives spiritually. Our ancestors planted them, and we are losing them today.”
AGREEMENT ON ICE: An international meeting in Tasmania “failed to agree on new conservation areas” for the fragile Antarctic marine environment, the Guardian wrote. The meeting, comprising 26 national governments and the EU, “hear[d] evidence the southern continent is facing a range of crises”, but the Russian delegation “opposed proposals to boost environmental protection”, the newspaper explained. Further debate on the three proposed protected areas has been pushed to next year as a result. The executive director of the Antarctic and Southern Ocean Coalition, Claire Christian, said: “It feels like we are taking one step forward and two steps back on Antarctic marine protection.”
KENYA OFFSETS: Kenya has signed a deal with Blue Carbon, a UAE-based company, that would “concede ‘millions of hectares’ of its territory for the production of carbon credits”, the Middle East Eye reported. This follows a “slew” of similar deals with Liberia, Tanzania, Zambia and Zimbabwe, the news site said. Elsewhere, the Guardian reported on allegations of sexual harassment at a leading carbon-offsetting project in southern Kenya, which is used by companies such as Netflix and Shell. A report from two NGOs alleged “extensive sexual abuse, harassment and exploitation between 2011 and 2023” by senior male employees of Wildlife Works, a California-based firm operating the Kasigau Corridor conservation project. In a statement, Wildlife Works’ president, Mike Korchinsky, said the company suspended three people after it became aware of the allegations in August.
BLOW TO FARMERS: Extreme weather events, such as floods, heavy rainfall and hailstorms, have made Italy fall to second place in worldwide wine production, wrote Fortune, with France now in first place. Overall, European wine production fell 5.5% compared with the average production from the last five years, according to the European farming lobby Copa-Cogeca. Meanwhile, in the UK, farmers have warned that potato and cereal crops might be affected by the recent floods caused by Storm Babet in October, reported the Guardian. The newspaper added that farmers’ crops were rotting due to the floods, driving the National Farmers’ Union to call on the government to implement a water strategy to prevent damages.
LATIN AMERICAN DROUGHT: The state of Pará, in northern Brazil, suffered an “unusually fierce dry season” caused by the combination of large-scale cattle farming, climate change and weather events such as El Niño, the Guardian reported. The publication wrote that palm trees “have started to shrivel up and turn brown”, rivers and aquifers are drying, the odour of smoke permeates the air and land-grabbers “are taking advantage of the tinder-dry conditions”. In the state of the Amazonas, also in Brazil, more than 3,000 forest fires were registered over 1-23 October, which has increased the number of respiratory problems, reported Mongabay. At the same time, it is expected that a “severe drought” will reduce daily ship crossings of the Panama Canal and increase shipping costs, according to MercoPress.
DUBIOUS DECLARATION: A new Unearthed investigation found that large EU agribusiness groups are using a “pro-meat manifesto” to lobby senior EU politicians. The “Dublin Declaration” – signed by more than 1,000 scientists and used by trade groups to oppose green policies – was “written, released and promoted by agribusiness consultants”, freedom of information requests revealed. Prof Erik Mathijs told Unearthed the declaration “is actually fairly uncontroversial” in asking that the “social, historical and cultural value” of animal food products be recognised. New York University’s Dr Matthew Hayek told the outlet the declaration was a “hugely misleading endeavour” that “fosters confusion and doubt when there should be none”. The declaration’s organising committee denied that their ties to private organisations was affecting their scientific objectivity.
Watch, read, listen
BANKING ON SEEDS: Indigenous peoples in Brazil are preserving the country’s biodiversity through a seed bank, Amanda Magnani wrote for Latin America News Dispatch.
‘DAUNTING TASK’: Marine geographer Dr Dawn Wright told NPR’s Short Wave about her experience exploring the seafloor and its importance for human life.
ENERGY VS ENVIRONMENT: In Cambodia, renewable energy projects are sparking debate over their impacts on local biodiversity, Anton Delgado said in the Japan Times.
INSECT REVOLUTION: A podcast from Table addressed the opportunities for expanding insect consumption in Europe and its potential to reduce land and water use.
New science
Adaptation of sea turtles to climate warming: Will phenological responses be sufficient to counteract changes in reproductive output?
Global Change Biology
According to a new study, changes in nesting behaviours will not be sufficient to offset the impacts of changing temperatures on sea turtles at a majority of nesting sites. Researchers modelled sea turtle hatching using both historical and projected air and sea temperatures under a moderate warming scenario, then assessed how nesting earlier or later in the year would improve hatching success and influence the sex ratio of the hatchlings. They found that although some turtles could maintain their current nesting temperatures, success rates and sex ratios by shifting their nesting timing, for half of the sites, no such shift would be able to maintain current temperatures. They conclude: “Turtles may need to use other adaptive responses and/or there is the need to enhance sea turtle resilience to climate warming.”
Climate change exacerbates nutrient disparities from seafood
Nature Climate Change
The availability of nutrients, such as iron and zinc, is expected to decline in seafood by around 30% by the end of the century in low-income countries under 4C of warming, a new study found. The researchers combined fisheries databases and predictive models to analyse nutrients from fisheries and aquaculture in the past and to project future paths under climate change. They found that climate change, for example, has driven changes in species distributions and productivity and modified catch composition, changing the nutrients people consume. The researchers highlighted the importance of seafood for physical and mental development and suggested securing “effective mitigation to support nutritional security of vulnerable nations and global health equity”.
Integrating climate adaptation and transboundary management: Guidelines for designing climate-smart marine protected areas
One Earth
New research found that future climate change, including marine heatwaves, could diminish ecological connectivity – the ability of organisms to move freely – in marine protected areas (MPAs) by 50% and hinder the recovery of vulnerable species to those changes. The researchers mapped and analysed areas of the coastal Pacific Ocean near California that met proposed MPA guidelines, then quantified the connectivity of fish and invertebrate larvae. The authors provided 21 guidelines for designing marine reserve networks, including incorporating connectivity, allowing time for recovery and adapting to climate change. They concluded that expanding marine protected areas coverage – particularly critical areas for connectivity and climate refugia – is crucial to enhancing the climate resilience of the ocean.
In the diary
- 9-10 November: CBD International dialogue with Indigenous peoples and local communities on the implementation of the Kunming-Montreal Global Biodiversity Framework and its Gender Plan of Action | Geneva, Switzerland
- 13-17 November: UNCCD 21st session of the committee for the review of the implementation of the UN Convention to Combat Desertification | Samarkand, Uzbekistan
- 13-17 November: 59th session of the of the International Tropical Timber Council | Pattaya, Thailand
- 13-17 November: UNFCCC Asia-Pacific Climate Week | Jahor, Malaysia
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 8 November 2023: ‘Hidden costs’ of food; Gas auction controversy; Looking towards COP28 appeared first on Carbon Brief.
Cropped 8 November 2023: ‘Hidden costs’ of food; Gas auction controversy; Looking towards COP28
Climate Change
What Is the Economic Impact of Data Centers? It’s a Secret.
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.
Climate Change
GEF raises $3.9bn ahead of funding deadline, $1bn below previous budget
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”.
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
Climate Change
Marine heatwaves ‘nearly double’ the economic damage caused by tropical cyclones
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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