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Record-breaking sea temperatures across the Gulf of Mexico have been a key ingredient behind some of the intense hurricanes devastating the region this year.

Last month, Hurricane Helene made landfall on Florida’s “Big Bend” and then stalled over several states to the north dumping “enormous rainfall totals”, resulting in epic flooding which killed at least 220 people.

Just a couple of weeks later, Milton – the ninth hurricane to form in the Atlantic this year and one of the most rapidly intensifying hurricanes on record – has swept this week towards Florida’s Tampa Bay region, threatening communities that are still recovering from Helene’s impact.

A rapid attribution study recently concluded that record-breaking ocean temperatures in the Gulf of Mexico, which helped Hurricane Helene to “spin up”, were made 200-500 times more likely because of human-caused climate change.

Scientists tell Carbon Brief that the same intense ocean heat likely helped to fuel Milton’s behaviour and explains how hurricanes can become more intense in a fast warming world.

How do hot oceans fuel hurricanes?

A hurricane is the name for a tropical cyclone that forms in the Atlantic Ocean or northeastern Pacific Ocean.

Atlantic hurricanes typically first form over the tropical waters of the north Atlantic off the African continent. As the systems travel westwards across the Atlantic, they draw up the warm, moist air that rises from the surface of the ocean, using it to fuel themselves and grow stronger.

As the low-pressure system picks up energy, winds can begin to spin, forming a storm. The warmer the ocean water is, the more energy the storm accumulates and the more quickly it can intensify. Sea surface temperatures of more than 26.5C down to a depth of 50 metres can drive the storm to intensify into a hurricane, once wind speeds exceed 74 miles per hour.

The 2024 Atlantic season runs from the start of June to the end of November and has already seen multiple intense storms, including the powerful Helene and Milton hurricanes, which have struck Florida within just two weeks of each other.

Both hurricanes picked up energy as they travelled over the Gulf of Mexico, which is currently experiencing a marine heatwave.

The graph below shows the extra ocean heat content – a metric that captures the amount of thermal energy stored in the water – for the Gulf of Mexico. For each month, it shows the extra ocean heat, compared with the average amount for that month during 2013-23.

Ocean heat content (kilojoules/cm2) in the Gulf of Mexico, compared to the 2013-23 monthly average. Data source: Brian McNoldy; University of Miami Upper Ocean Dynamics Lab
Ocean heat content (kilojoules/cm2) in the Gulf of Mexico, compared to the 2013-23 monthly average. Data source: Brian McNoldy; University of Miami Upper Ocean Dynamics Lab

A tropical storm is said to undergo “rapid intensification” if its wind speed increases by at least 35mph over a 24-hour period. Hurricane Milton’s wind speed accelerated faster than all but two previously recorded storms, with more than a 90mph increase in speeds in just 24 hours, ranking it as one of the “strongest” Atlantic storms ever recorded.

A study published in August in the Nature journal Communications Earth & Environment examined hurricanes that form over the Gulf of Mexico. It found that “rapid intensification” is 50% more likely to occur during marine heatwaves.

A rapid attribution study by Climate Central indicates that, over the past two weeks, the record-breaking temperatures in the Gulf of Mexico were made 400-800 times more likely by climate change.

Dr Kevin Reed – a researcher from Stony Brook University in New York – tells Carbon Brief that “Hurricane Milton’s rapid intensification this week is a telltale sign of climate change, which is responsible – in part – for the near-record temperatures in the Gulf of Mexico currently”. He adds:

“Warmer ocean temperatures are leading to more storms that undergo rapid intensification leading to an increase in the proportion of storms that reach major hurricane strength.”

A rapid attribution study from the World Weather Attribution (WWA) service examining Hurricane Helene used a model to investigate its strong winds by analysing storms making landfall within two degrees (120 nautical miles) of Helene. It said:

“By statistically modelling storms in a 1.3C cooler climate, this model showed that climate change was responsible for an increase of about 150% in the number of such storms (now once every 53 years on average, up from every 130 years) and, equivalently, that the maximum wind speeds of similar storms are now about 6.1 m/s (around 11%) more intense.” 

The same team is now conducting a rapid analysis on the influence of climate change on Hurricane Milton, which will be released on Friday.

“This is in line with other scientific findings that Atlantic tropical cyclones are becoming wetter under climate change and undergoing more rapid intensification,” the WWA study on Helene finds.

Dr Kerry Emanuel, a professor of meteorology at the Massachusetts Institute of Technology, tells Carbon Brief that “Milton’s behaviour is consistent with predictions that hurricane scientists have made going back at least three decades”.

New normal?

Since 1878, around six to seven hurricanes, on average, have formed in the North Atlantic every year, with only a couple typically making landfall in the US.

The number of Atlantic hurricanes on record has increased over the period 1851-2019. However, some research suggests that more consistent monitoring, rather than a true increase in hurricane numbers, is behind this trend.

There is a clearer trend of increasing hurricane intensity. Research shows that the proportion of tropical cyclones reaching at least category 3 intensity has also risen over the past four decades. Although the study does not confidently link this increase to climate change, it notes that higher sea surface temperatures are likely to contribute. 

As Prof Andrew Dessler summarises on his Climate Brink blog, the impact of climate change on the intensity and frequency of tropical cyclones is still not certain. However, he says that “we can have high confidence that climate change will drive more intense hurricanes”. 

Meanwhile, studies have shown that the record-breaking 2020 Atlantic hurricane season, when 14 hurricanes were recorded, was partly due to increased sea surface temperatures. 

A study published by Nature Communications in 2022 found that human-caused climate change increased sea surface temperatures in the North Atlantic basin by 0.4-0.9C. The authors estimated that this increased “extreme three-hourly storm rainfall rates” and “extreme three-day accumulated rainfall amounts” for Atlantic storms by 11% and 8%, respectively.

Another 2022 study published in Nature Communications found that over the period 1982-2020, climate change-induced increases in sea surface temperatures doubled the probability of “extremely active tropical cyclone seasons”. The 2020 season might have been made twice as likely by ocean surface warming, the authors found.

The post Explainer: How hotter oceans can fuel more intense Atlantic hurricanes appeared first on Carbon Brief.

Explainer: How hotter oceans can fuel more intense Atlantic hurricanes

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A New Tool Could Help Track Deep-Sea Mining Activity

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Countries are still debating whether to mine the seafloor for minerals, but exploratory efforts have already begun.

As demand for critical minerals surges around the world, countries are debating whether to mine the untapped deep-sea reserves of cobalt, copper and manganese, miles below the surface. But a growing body of research shows that these activities could have profound consequences for ocean ecosystems, and the industries and communities that rely on them.

A New Tool Could Help Track Deep-Sea Mining Activity

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IEA: Slow transition away from fossil fuels would cost over a million energy sector jobs

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A slower shift to clean energy could leave the world with 1.3 million fewer energy sector jobs by 2035 compared with a scenario in which governments fully implement their green policies, the International Energy Agency (IEA) has found.

In its annual World Energy Employment report, the Paris-based watchdog said on Friday that the Current Policies Scenario (CPS), which it reintroduced under pressure from the Trump administration, has “more muted” employment growth than the Stated Policies Scenario.

The CPS sees oil and gas demand continuing to rise until at least 2050 – a scenario that the IEA described as “cautious” and “anchored in enacted laws and measures” and was widely criticised by clean energy experts.

A fast energy transition would spur investment in construction, creating more jobs across the sector. New roles for electricians, building insulators, solar panel and energy-efficient lightbulb installers, and transition mineral miners would more than offset job losses in coal mines, power plants and oil and gas fields, the report found.

    Anabella Rosemberg, Just Transition lead at Climate Action Network International, lamented that the clean energy sector is “being undermined at a time when employment creation is of utmost priority”.

    “Climate ambition and decent job creation must go hand in hand – but as the recent conversations at COP30 showed, there is a need for both the right targets and just transition strategies to make it happen,” she added.

    A more ambitious Net Zero Emissions scenario, aligned with the Paris Agreement goal of limiting global warming to 1.5C, would see roughly ten million more energy jobs created than under the CPS, report author Daniel Wetzel told Climate Home News at a press conference.

    Bottleneck warnings

    The IEA warned that governments must act to train workers for these roles or risk facing shortages of electricians, welders, and grid specialists – a gap that could slow the energy transition and drive up wages and energy costs.

    IEA head Fatih Birol highlighted a particular shortage of qualified workers in the nuclear industry, warning that the problem could worsen as the sector’s workforce continues to age. “I hear nuclear is making a comeback, but the interest in the nuclear sector for the jobs is rather weak,” he said.

    Laura Cozzi, IEA’s Director of Sustainability, Technology and Outlooks, warned of a shortage of skilled workers in electricity grids. “That is one of the key ingredients why we are not seeing grids ramp up as [they] should,” she said. Over 60 governments pledged at COP29 to improve and expand their grids to enable clean electricity to flow to where it is needed.

      Bert De Wel, Global Coordinator for Climate Policy at the International Trade Union Confederation, celebrated that the energy transition is creating jobs but added that they should be good jobs with decent pay, conditions and union rights. Decent work would attract skilled workers, he added.

      The report found that wages in the oil and gas industry have generally risen faster over the past year than in the solar – and especially the wind – sectors. It noted that the oil and gas industry has a “historical tendency to offer highly competitive wages to attract and retain top talent”.

      At the COP30 climate summit, governments agreed to set up the Belém Action Mechanism to try and make the energy transition fairer to groups such as workers in the energy industry. It will give trade unions a formal role in shaping just transition policies, for what the ITUC says is the first time.

      ITUC General Secretary Luc Triangle called it a “decisive win for the union movement and working people across the world, in all sectors but especially those in transition industries.”

      The post IEA: Slow transition away from fossil fuels would cost over a million energy sector jobs appeared first on Climate Home News.

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      DeBriefed 5 December: Deadly Asia floods; Adaptation finance target examined; Global south IPCC scientists speak out

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      Welcome to Carbon Brief’s DeBriefed.
      An essential guide to the week’s key developments relating to climate change.

      This week

      Deadly floods in Asia

      MOUNTING DEVASTATION: The Associated Press reported that the death toll from catastrophic floods in south-east Asia had reached 1,500, with Indonesia, Sri Lanka and Thailand most affected and hundreds still missing. The newswire said “thousands” more face “severe” food and clean-water shortages. Heavy rains and thunderstorms are expected this weekend, it added, with “saturated soil and swollen rivers leaving communities on edge”. Earlier in the week, Bloomberg said the floods had caused “at least $20bn in losses”.

      CLIMATE CHANGE LINKS: A number of outlets have investigated the links between the floods and human-caused climate change. Agence France-Presse explained that climate change was “producing more intense rain events because a warmer atmosphere holds more moisture and warmer oceans can turbocharge storms”. Meanwhile, environmental groups told the Associated Press the situation had been exacerbated by “decades of deforestation”, which had “stripped away natural defenses that once absorbed rainfall and stabilised soil”.

      ‘NEW NORMAL’: The Associated Press quoted Malaysian researcher Dr Jemilah Mahmood saying: “South-east Asia should brace for a likely continuation and potential worsening of extreme weather in 2026 and for many years.” Al Jazeera reported that the International Federation of Red Cross and Red Crescent Societies had called for “stronger legal and policy frameworks to protect people in disasters”. The organisation’s Asia-Pacific director said the floods were a “stark reminder that climate-driven disasters are becoming the new normal”, the outlet said.

      Around the world

      • REVOKED: The UK and Netherlands withdrew $2.2bn of financial backing from a controversial liquified natural gas (LNG) project in Mozambique, Reuters reported. The Guardian noted that TotalEnergies’ “giant” project stood accused of “fuelling the climate crisis and deadly terror attacks”.
      • REVERSED: US president Donald Trump announced plans to “significantly weaken” Biden-era fuel efficiency requirements for cars, the New York Times said.
      • RESTRICTED: EU leaders agreed to ban the import of Russian gas from autumn 2027, the Financial Times reported. Meanwhile, Reuters said it is “likely” the European Commission will delay announcing a plan on auto sector climate targets next week, following pressure to “weaken” a 2035 cut-off for combustion engines.
      • RETRACTED: An influential Nature study that looked at the economic consequences of climate change has been withdrawn after “criticism from peers”, according to Bloomberg. [The research came second in Carbon Brief’s ranking of the climate papers most covered by the media in 2024.]
      • REBUKED: The federal government of Canada faced a backlash over an oil pipeline deal struck last week with the province of Alberta. CBC News noted that ​​First Nations chiefs voted “unanimously” to demand the withdrawal of the deal and Canada’s National Observer quoted author Naomi Klein as saying that the prime minister was “completely trashing Canada’s climate commitments”.
      • RESCHEDULED: The Indonesian government has cancelled plans to close a coal plant seven years early, Bloomberg reported. Meanwhile, Bloomberg separately reported that India is mulling an “unprecedented increase” in coal-power capacity that could see plants built “until at least 2047”.

      $518 billion a year

      The projected coastal flood damages for the Asia-Pacific region by 2100 if current policies continue, according to a Scientific Reports study covered this week by Carbon Brief.


      Latest climate research

      • More than 100 “climate-sensitive rivers” worldwide are experiencing “large and severe changes in streamflow volume and timing” | Environmental Research Letters
      • Africa’s forests have switched from a carbon sink into a source | Scientific Reports
      • Increasing urbanisation can “substantially intensify warming”, contributing up to 0.44C of additional temperature rise per year through 2060 | Communications Earth & Environment

      (For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)

      Captured

      A new target for developed nations to triple adaptation finance by 2035, agreed at the COP30 climate summit, would not cover more than a third of developing countries’ estimated needs, Carbon Brief analysis showed. The chart above compares a straight line to meeting the adaptation finance target (blue), alongside an estimate of countries’ adaptation needs (grey), which was calculated using figures from the latest UN Environmental Programme adaptation gap report, based on countries’ UN climate plans (called “nationally determined contributions” or NDCs) and national adaptation plans (NAPs).

      Spotlight

      Inclusivity at the IPCC

      This week, Carbon Brief speaks to an IPCC lead author researching ways to improve the experience of global south scientists taking part in producing the UN climate body’s assessments.

      Hundreds of climate scientists from around the world met in Paris this week to start work on the Intergovernmental Panel on Climate Change’s (IPCC’s) newest set of climate reports.

      The IPCC is the UN body responsible for producing the world’s most authoritative climate science reports. Hundreds of scientists from across the globe contribute to each “assessment cycle”, which sees researchers aim to condense all published climate science over several years into three “working group” reports.

      The reports inform the decisions of governments – including at UN climate talks – as well as the public understanding of climate change.

      The experts gathering in Paris are the most diverse group ever convened by the IPCC.

      Earlier this year, Carbon Brief analysis found that – for the first time in an IPCC cycle – citizens of the global south make up 50% of authors of the three working group reports. The IPCC has celebrated this milestone, with IPCC chair Prof Jim Skea touting the seventh assessment report’s (AR7’s) “increased diversity” in August.

      But some IPCC scientists have cautioned that the growing involvement of global south scientists does not translate into an inclusive process.

      “What happens behind closed doors in these meeting rooms doesn’t necessarily mirror what the diversity numbers say,” Dr Shobha Maharaj, a Trinidadian climate scientist who is a coordinating lead author for working group two (WG2) of AR7, told Carbon Brief.

      Global south perspective

      Motivated by conversations with colleagues and her own “uncomfortable” experience working on the small-islands chapter of the sixth assessment cycle (AR6) WG2 report, Maharaj – an adjunct professor at the University of Fiji – reached out to dozens of fellow contributors to understand their experience.

      The exercise, she said, revealed a “dominance of thinking and opinions from global north scientists, whereas the global south scientists – the scientists who were people of colour – were generally suppressed”.

      The perspectives of scientists who took part in the survey and future recommendations for the IPCC are set out in a peer-reviewed essay – co-authored by 20 researchers – slated for publication in the journal PLOS Climate. (Maharaj also presented the findings to the IPCC in September.)

      The draft version of the essay notes that global south scientists working on WG2 in AR6 said they confronted a number of diversity, equity and inclusion (DEI) issues, including “skewed” author selection, “unequal” power dynamics and a “lack of respect and trust”. The researchers also pointed to logistical constraints faced by global south authors, such as visa issues and limited access to journals.

      The anonymous quotations from more than 30 scientists included in the essay, Maharaj said, are “clear data points” that she believes can advance a discussion about how to make academia more inclusive.

      “The literature is full of the problems that people of colour or global south authors have in academia, but what you don’t find very often is quotations – especially from climate scientists,” she said. “We tend to be quite a conservative bunch.”

      Road to ‘improvement’

      Among the recommendations set out in the essay are for DEI training, the appointment of a “diversity and inclusion ombudsman” and for updated codes of conduct.

      Marharaj said that these “tactical measures” need to occur alongside “transformative approaches” that help “address value systems, dismantle power structures [and] change the rules of participation”.

      With drafting of the AR7 reports now underway, Maharaj said she is “hopeful” the new cycle can be an improvement on the last, pointing to a number of “welcome” steps from the IPCC.

      This includes holding the first-ever expert meeting on DEI this autumn, new mechanisms where authors can flag concerns and the recruitment of a “science and capacity officer” to support WG2 authors.

      The hope, Maharaj explained, is to enhance – not undermine – climate science.

      “The idea here was to move forward and to improve the IPCC, rather than attack it,” she said. “Because we all love the science – and we really value what the IPCC brings to the world.”

      Watch, read, listen

      BROKEN PROMISES: Climate Home News spoke to communities in Nigeria let down by the government’s failure to clean up oil spills by foreign companies.

      ‘WHEN A ROAD GOES WRONG’: Inside Climate News looked at how a new road from Brazil’s western Amazon to Peru has become a “conduit for rampant deforestation and illegal gold mining”.

      SHADOWY COURTS: In the Guardian, George Monbiot lamented the rise of investor-state dispute settlements, which he described as “undemocratic offshore tribunals” that are already having a “chilling effect” on countries’ climate ambitions.

      Coming up

      Pick of the jobs

      DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.

      This is an online version of Carbon Brief’s weekly DeBriefed email newsletter. Subscribe for free here.

      The post DeBriefed 5 December: Deadly Asia floods; Adaptation finance target examined; Global south IPCC scientists speak out appeared first on Carbon Brief.

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