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The Academy of Macroeconomic Research (AMR) is a research institution under the direct supervision of China’s National Development and Reform Commission (NDRC), the ministry in charge of economic development and planning.

As a “national high-end thinktank”, the AMR’s Energy Research Institute is a well-respected body conducting energy transition research and providing vital suggestions on the energy transition to Beijing. 

At this year’s COP29 in Baku, it launched the executive summary of 2024 China Energy Transformation Outlook (CETO), a key report describing China’s pathways to net-zero.

The launch was attended by a number of high-level officials, including climate envoy Liu Zhenmin and the head of the International Energy Agency, Dr Fatih Birol.

Carbon Brief’s Wanyuan Song was granted a rare – and lengthy – joint interview with its director general, Prof Lyu Wenbin, and director, Prof Bai Quan, who is also the lead author of the report, to hear their views about China’s energy transition.

  • On China’s commitment to climate action: “Climate change doesn’t just affect China, it affects every country in the world…Climate change is not fake. It is happening and we are all on the same boat.”
  • On international collaboration: “The joint work [on energy transition pathways] was meant to allow for a deeper grasp of the problems, making the research findings more scientific and [suggestions] more reasonable.”
  • On an early emissions peak: “[W]e would love to try our best…but we can’t rule out all possibilities to peak even earlier than planned.”
  • On updates in this year’s outlook: [This year w]e have also placed more emphasis on international cooperation.”
  • On the need for global cooperation: “To achieve the best scenario, China shouldn’t be the only country that puts efforts into energy transition.”
  • On stimulus and carbon reduction: “China’s ‘two new’ (“两新”) policy – large-scale equipment renewals and trade-ins of consumer goods – is one of [the policies]. The first three aspects [of ‘two new’] directly promote carbon reduction.”
  • On managing electricity grids and markets: “China has never faced this kind of challenge before. The demand for electricity is huge, and soaring.”
  • On China’s coal use: “With renewable energy becoming more powerful and energy storage becoming cheaper and more flexible, coal plants can play the role of ‘firefighters’ in the system – used in an electricity crisis whenever it is needed.”
  • On the role of “green hydrogen”: “[I]t is very expensive at the moment…Commercial and technology innovation are needed to reduce costs.”
  • On calls for greater ambition from China: “It can’t be the case that developing countries need to cut more emissions than developed countries – that would break the UN’s principle of ‘common but differentiated responsibilities’.”

CB: Why is China so determined to achieve its energy transition and combat climate change?

Bai Quan: Climate change doesn’t just affect China, it affects every country in the world. No one is excluded from it. China is one of the victims of extreme weather. The horrifying typhoon in Shanghai in recent months has blown windows off of skyscrapers – Shanghai didn’t have that many typhoons in the past. Autumn in Qinghai province [in west China] used to be cool and dry, but now it has become rainy. The weather forecast [once] said there was light rain in Beijing, but the heavy rain in the neighbouring province Hebei drowned people. Summer is getting hotter and winter is getting colder – this is climate change, and no one can survive alone. If Shanghai was drowned, would London be spared, would New York be OK? Climate change is not fake. It is happening and we are all on the same boat. 

Combating climate change is a must, it is one of our core needs, and the primary thing we need to do to secure life and production. Low-carbon issues have been part of China’s policy  for a long time but it wasn’t as big of a focus until President Xi vouched for climate action with the “dual-carbon” goal. The [“dual-carbon” goal] promise to the world is serious and, after President Xi announced it in 2020, it has become a hot topic [in media and among ordinary people]. The energy transition, as a sustainable solution, helps the “dual-carbon” goal to be realised. 

CB: Your institute is working with national and international partners to produce an annual “China energy transformation outlook”. Can you tell me how that collaboration came about and what the aims of the project are?

Lyu Wenbin: The Chinese government has proposed the “dual-carbon” goal, and the energy transition is an important part of this process. Now that a goal has been clearly set, what we should do to deliver it is to choose the best pathway. Our research was conducted along with the Danish Energy Agency and Columbia University. The joint work was meant to allow for a deeper grasp of the problems, making the research findings more scientific and [suggestions] more reasonable. 

CB: We covered your CETO 2023 report, in which you listed three stages of transformation. The first of these phases is the peaking phase, which lasts until 2030. With China rapidly expanding renewable energy this year and hitting its wind and solar capacity targets six years early, do you think China could peak even earlier than planned – “before 2030”?

BQ: There are many uncertainties and changes in the world economy, geopolitics and even military actions at the moment. Uncertainty also exists in climate change. China’s electricity consumption grew faster than expected and we would love to try our best to overcome all the difficulties to meet China’s carbon peaking goal before 2030, but we can’t rule out all possibilities to peak even earlier than planned.

CB: What differences are there in your outlook for China’s energy transition this year, compared to 2023?

BQ: The scenarios are different, although they are basically aligned. We have also placed more emphasis on international cooperation. The report itself has absorbed experiences from different places, such as Denmark’s experience in heating, for modelling, pathway design and other suggestions in the report. We would be very interested in discussing more new ideas and sharing our experience with everyone else.

CB: What would be needed for China to realise the most ambitious energy transition scenario featured in your report?

BQ: To achieve the best scenario, China shouldn’t be the only country that puts efforts into energy transition. China, as a developing country, at the government level and at the individual level, has already done a lot. The energy transition needs global cooperation. More people will realise the urgent need to combat climate change if we all join hands together. Solving some problems, such as commercialising hydrogen, also needs more joint research.

CB: You have previously said China’s energy transition relies on comprehensive policy support for green industry, “effective” investment in the green and low-carbon sector as well as promoting green consumption. Do you see signs of this in government plans for economic stimulus? 

BQ: Yes, many! China’s “two new” (“两新”) policy – large-scale equipment renewals and trade-ins of consumer goods – is one of them. In the document issued by the State Council [China’s central government], there are four aspects: “implementing equipment updates, trade-in of consumer goods, recycling, and improving standards”. 

The first three aspects directly promote carbon reduction. The first one is to service industrial sectors, the second one is to serve the general public, and the third one is for China’s “circular economy”. The last aspect indirectly serves energy saving and carbon reduction goals, by setting standards [for energy usage, emissions and recycling] to prevent people from re-purchasing outdated equipment with low energy efficiency.

In the past, it was difficult to recycle old production equipment, such as large motors. One obstacle is the challenge of acquiring a “first receipt” to be eligible for tax deductions. [Scrapped product sellers often cannot provide the purchase receipt – the “first receipt” – to the resource recycling companies for value-added tax deductions.] The new policy allows an ordinary invoice to be used for pre-tax deduction, solving the problem. This is a very important incentive to meet the 2027 goals [of the “two new” policy]. 

For the ordinary people, the “two new” policy also benefits their daily life. For example, they can receive subsidies for about 10-20% of a new purchase, with up to 2,000 yuan ($276) to trade-in a new fridge. [Trade-in subsidies for home appliances cover fridges, washing machines, televisions, air conditioners and computers.] They can get new energy saving electronics appliances at a very low price.

The “two new” policy documents clearly state the delineation of responsibilities of both the central and local governments, including funding they should provide. [The central government accounts for about 90% of funding and has issued a 300bn yuan ($41bn) bond to support this effort.] China holds regular press conferences stating progress on the “two new” policy, including on the renewal of outdated solar and wind equipment.

Another vital policy is the “guidelines to ramp up green transition of economic, social development” issued by the Central Committee of the Communist Party of China and the State Council. [See Carbon Brief’s China Briefing for more.] That is to say, it’s not just the [state-affiliated] State Council that promotes the “green transformation”, the Central Committee [the leading body of the Communist party] also really values it. There was a green transition policy before, but this new policy is a top-level design of “full green transition” [across every aspect of society]. It is a blueprint of China’s transition in industry, building [construction], transportation, energy and many other areas. Together with the “two new”, which is an implementation document for this top-level design, we now have both a direction and a manual for the energy transition. 

CB: China is attempting to upgrade its electricity grids and markets to manage the variability of wind and solar power. What are the biggest challenges it faces in this area?

BQ: China has never faced this kind of challenge before. The demand for electricity is huge, and soaring. Reforms in the electricity pricing system and grid management are underway, and so are many other reforms. These reforms need to be economical, fair and feasible. Reforms, in general, have less impact on the rich than the poor. In the end, we can’t just ignore energy safety and cut electricity supply, nor ignore the poor being unable to afford it. This is a big challenge for the government to achieve in such a short time, especially if we are to peak carbon before 2030. Current price reform, in terms of whole reform effort, is happening very quickly, with the medium-to-long term contract reforms, as well as the spot market and the ancillary market reforms. However, it is a complicated matter, with each province facing different situations. Industrial usage and civilian usage are also different – we need to protect ordinary people’s needs.

CB: There has been significant international criticism of China’s decision to use coal-fired power plants as “flexibility providers” in its energy transition. Will coal continue to be necessary for China’s energy mix as it approaches carbon neutrality in 2060 and beyond, and how effective are China’s current efforts to develop low-carbon coal-fired power?

BQ: China’s principle is “construction new before destruct old” (先立后破), which is also translated as “build before breaking”. [See Carbon Brief’s articles from 2021 and 2022 for background.] The challenge China faces is different [from other countries], our electricity consumption is growing too fast. Energy security for us is most important, and cutting coal out completely does not match the basic principle of energy supply. What we can do is to increase the share of green electricity when improving the overall quantity and quality of electricity supply. Power grids also need to improve capacity for electricity generated from renewable sources, to counter their variable nature. Energy storage is an ideal solution for us, but it is too expensive at the moment. 

The only pragmatic solution at the moment is asking coal plants to “tiao feng” (调峰, part-load operation, which means run below full-capacity). The old design of a coal-fired power plant was to operate for 5,500 hours annually, but they are at about 4,000 hours now. With renewable energy becoming more powerful and energy storage becoming cheaper and more flexible, coal plants can play the role of “firefighters” in the system – used in an electricity crisis whenever it is needed. 

Overall, electricity is the core of future development. Reforms in electricity generation, power grids, electricity usage and electricity demand are all needed. Developing countries in particular face harder challenges. It is not only China – Vietnam and India also are exploring solutions to their power problems. Therefore, we emphasise global cooperation, which is vital for finding a solution for us all.

CB: Will “green hydrogen” play a significant role in China’s future energy mix and, if so, when do you think it will be deployed at scale?

BQ: Yes. Green hydrogen is a great alternative for fossil fuels in the chemical industry and the transportation sector. We were excited about it when it was first discovered, but it is very expensive at the moment. To deploy green hydrogen, commercial and technology innovation are needed, to reduce costs.

China’s carbon pricing has not reached the chemical industry yet, but it might change with changes in the market. The commercialisation of hydrogen is very important, a hydrogen fuel-cell vehicle needs to be affordable. We face the same problem that the EU faces and we would love to learn from them. 

CB: Recent research has suggested that China should reduce emissions to at least 30% below 2023 levels by 2035, to align with the Paris Agreement goal of limiting warming to 1.5C. Some Chinese scientists have called this 30% figure “too ambitious”. Do you think a 30% reduction would be achievable? 

BQ: I haven’t read the paper so can’t comment on it. I am not sure if there are suggestions for other countries in this research paper. [International expectations for China’s climate goals] need to be fair for China, as a developing country. [They] need to consider the shared responsibilities of the developed countries, including the US and EU. It can’t be the case that developing countries need to cut more emissions than developed countries – that would break the UN’s principle of “common but differentiated responsibilities”. China has not yet reached carbon peak, it still has some ways to go.

The post The Carbon Brief Interview: Prof Lyu Wenbin and Prof Bai Quan appeared first on Carbon Brief.

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What Is the Economic Impact of Data Centers? It’s a Secret.

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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.

What Is the Economic Impact of Data Centers? It’s a Secret.

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GEF raises $3.9bn ahead of funding deadline, $1bn below previous budget

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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.

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    Marine heatwaves ‘nearly double’ the economic damage caused by tropical cyclones

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    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).

    Average maximum sustained wind speed (top) and rate of rainfall (bottom) for tropical cyclones in the period leading up to and following landfall. Storms are categorised as: rapidly intensifying with marine heatwaves (red); rapidly intensifying without marine heatwaves (purple); not rapidly intensifying with marine heatwaves (orange); and not rapidly intensifying, without marine heatwaves (blue). Source: Radfar et al. (2026)
    Average maximum sustained wind speed (top) and rate of rainfall (bottom) for tropical cyclones in the period leading up to and following landfall. Storms are categorised as: rapidly intensifying with marine heatwaves (red); rapidly intensifying without marine heatwaves (purple); not rapidly intensifying with marine heatwaves (orange); and not rapidly intensifying, without marine heatwaves (blue). Source: Radfar et al. (2026)

    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.

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