Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
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This week
Atlantic and Amazon ‘tipping points’
CURRENT COLLAPSE?: New research found the Atlantic Meridional Overturning Circulation (AMOC), a large system of ocean currents that helps keep western Europe milder, “may already be on course to a tipping point”, the Press Association reported. The Associated Press said: “An abrupt shutdown of Atlantic Ocean currents that could put large parts of Europe in a deep freeze is looking a bit more likely and closer than before.”
QUESTION MARKS: The Daily Telegraph quoted Prof Jonathan Bamber, director of the Bristol Glaciology Centre, saying the new research was “entirely unrealistic for even the most extreme warming scenario over the next century”. But on the scientific blog RealClimate, ocean scientist Prof Stefan Rahmstorf noted that it was “observational data from the South Atlantic which suggest the AMOC is on tipping course” and that the model simulation was “just there to get a better understanding of which early warning signals work and why”.
AMAZON STRESS: Another study found that up to half of the Amazon is facing combined stress from rising heat, drought, deforestation and other factors that could push the rainforest towards a tipping point by 2050, Reuters reported. The research is the first to assess the cumulative impact of multiple threats, the New York Times reported. Carbon Brief also covered the findings.
‘Troika’ tout 1.5C target
COP30 COUNTDOWN: The United Arab Emirates, Azerbaijan and Brazil – hosts of the COP28, COP29 and COP30 climate summits – are teaming up to push for higher ambition towards the 1.5C limit, Al Jazeera reported. The “troika” wants countries to submit more ambitious pledges ahead of COP30 in Belem, Brazil next year, the outlet said.
MISSION 1.5C: Their efforts were mandated by the COP28 outcome, which launched an undefined “set of activities” known as “road map to mission 1.5C”. Meanwhile, Azerbaijan is on track to raise its gas output by 35% in a decade, Agence France-Presse reported.
MINISTERIAL MEETING: The International Energy Agency (IEA) held its 50th ministerial meeting this week, where leaders pledged in a communique to strengthen energy security and speed efforts towards 1.5C, Bloomberg reported. The IEA, which currently has 31 full members, also opened talks with India over joining the club, Press Trust of India reported.
Around the world
- INDONESIA ELECTS: Defence minister Prabowo Subianto, a “veteran…with a hardline military past”, will be the country’s next president, the Jakarta Post reported. He owns a coal business and “could increase deforestation and coal use”, said NPR.
- DRY JANUARY: A lack of rain in January caused Mexico’s “worst drought” for 12 years, Excélsior reported. Chile is clearing up after devastating forest fires, said El Mercurio, while Peru has issued warnings over heat stroke, El Comercio reported.
- MIGRATORY THREAT: One in five migratory species are under threat from human impacts including climate change, according to a UN report covered by BBC News.
- SAUDI TRANSITION ADMISSION: Oil giant Aramco dropped its expansion plans because of the energy transition, CNBC reported, quoting Saudi Arabia’s energy minister. The surprise move late last month had “spark[ed] questions” over the kingdom’s “concerns over the future of oil demand”, the outlet added.
- AFRICAN MYSTERY: New research casts doubt on earlier findings that Africa’s tropical ecosystems are releasing 6bn tonnes of carbon dioxide a year, Carbon Brief reported. Both sides agree on-the-ground data is needed to unravel the mystery.
- SHELL GAME: Demand for liquified natural gas (LNG) will “surge 50% by 2040” according to Shell, the Financial Times reported. The forecast, from the “world’s largest private LNG trader”, was “slightly lower” than last year, the paper said.
€881 billion
The record value of global carbon markets in 2023, according to a report from London Stock Exchange Group covered by BusinessGreen.
Latest climate research
- A new report from Climate Analytics translated the global goal of tripling renewable capacity by 2030 into regional targets and said only Asia was broadly on track.
- Research in Nature Energy explained how different types of lower-income coal, oil and gas producers can transition away from fossil fuels.
- Global warming “will lead to widespread increases in locust outbreaks”, found a study in Science Advances.
(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)
Captured
Only a fifth of the population of the Democratic Republic of the Congo (DRC) has access to electricity, with per-capita consumption below that of an average UK fridge, reported Carbon Brief in its latest country profile. Despite using hardly any fossil fuels, the country is one of the world’s biggest greenhouse gas emitters, the profile explained, as a result of human-caused land use changes in its major forests and peatlands.
Spotlight
‘Underestimated’ global public support for climate action
This week, Carbon Brief interviews the authors of new research finding that “almost universal” global support for climate action is “systematically underestimated”.
Carbon Brief: Your survey of nearly 130,000 people in 125 countries found “almost universal” support (86%) for climate action. Were you surprised?
Prof Peter Andre, Prof Teodora Boneva, Prof Felix Chopra and Prof Armin Falk: We were indeed surprised to find that the percentage of the population approving of pro-climate social norms and demanding more political action from their national government is very high in almost all countries in our sample. We were probably misled by the same pessimism that we found to be so widespread across the globe. A broad majority of people across the globe is willing to pay a personal cost [to fight global warming]. However, in 110 out of 125 countries, the majority thinks that they are in the minority.
CB: Do you think this would hold for specific policies, such as a carbon tax?
PA, TB, FC and AF: One cannot simply equate support in the survey with support for specific policy proposals. [However], in a representative US sample, we do find that the general demand for more political action is strongly correlated with demand for specific climate policies, such as a carbon tax.
CB: There has been a resurgence of anti-climate rhetoric from politicians and the media in many countries. Do you think public opinion has shifted since your survey in 2021-22?
PA, TB, FC and AF: We do not detect any clear time trend within our samples from 2021 and 2022, but do not have data for the most recent months. If we were to speculate, we would not want to fall victim to the same pessimism one more time. Our best guess is that the support for climate action has increased rather than decreased in the last two years.
CB: You found stronger willingness to contribute among respondents in poorer, hotter and more vulnerable countries. Why do you think richer people are less willing to pay their way?
PA, TB, FC and AF: Two potential explanations come to mind. First, richer countries are still strongly dependent on fossil fuels. The mitigation costs could therefore be perceived as relatively high and the required lifestyle changes as too drastic. At the same time, richer countries may be more resilient: A country’s GDP per capita reflects its economic capacity to cope with climate change. The most direct and immediate consequences are likely to be concentrated in more vulnerable countries, which have fewer resources to mitigate the negative consequences of the climate crisis.
CB: You found people systematically underestimated the willingness of their peers to contribute to climate action. Why do you think that is – and how could it be changed?
PA, TB, FC and AF: The reasons for this perception gap are likely to be manifold. In the past, media and public discussions have given a lot of focus to the small number of climate change sceptics and have fallen prey to the efforts of special interest groups. Moreover, climate change is difficult to tackle. People might mistakenly infer that the slow progress in combating climate change is due to a widespread lack of personal commitment.
In our view, correcting this perception gap is more important than understanding its origin. Humans are (what behavioural scientists call) “conditional cooperators”. They contribute more to the public good if they believe that others contribute as well. For this reason, pessimism about others’ contributions is harmful. It can constitute a critical obstacle for climate action. We thus conclude in the paper that, “[r]ather than echoing the concerns of a vocal minority that opposes any form of climate action, we need to effectively communicate that the vast majority of people around the world are willing to act against climate change and expect their national government to act”. We hope that our study sparks a debate on this topic, and increases awareness about the large global support for climate action.
This interview was edited for length. A full transcript will be published on Carbon Brief’s website later today.
Watch, read, listen
‘UNINSURABLE WORLD’: A Financial Times “big read” looked at rising insurance premiums as extreme weather events become more frequent.
TRUMP WARNING: An election win for former US president Donald Trump would “spell disaster for climate action in Africa”, wrote Nathaniel Mong’are, adviser to the Kenyan cabinet secretary, in an article for SciDevNet.
WTF?: Popular Indian podcast WTF is? tackled climate change, interviewing researcher Prof Navroz Dubash, activist Sunita Narain and others.
Coming up
- 11-17 February: COP14 for migratory species, Samarkand, Uzbekistan
- 17-18 February: African Union summit, Addis Ababa, Ethiopia
- 19 February to 1 March: Sixth UN Environment Assembly, Nairobi, Kenya
- 20 February: International Energy Agency (IEA) beyond COP28 event, Paris, France
- 21-23 February: Climate and Clean Air Conference, Nairobi, Kenya
Pick of the jobs
- Global Witness, investigator and senior investigator of climate disinformation | Salary: £44,837 and £52,494, respectively. Location: London (hybrid)
- California-China Climate Institute, University of California, Berkeley, climate policy fellow | Salary: $70,500-$86,900. Location: Berkeley, California
- Small World Consulting, sustainability consultants for carbon management and land use | Salary: £29,000-£40,000. Location: Lancaster, UK
- Common Wealth, principal or senior analyst for transatlantic energy | Salary: £43,500 for senior analyst or £50,500 for principal analyst. Location: London or US east coast
DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org
The post DeBriefed 16 February 2024: Atlantic and Amazon ‘tipping points’; New ‘troika’ for 1.5C; Global support for climate action ‘underestimated’ appeared first on Carbon Brief.
Drought and heatwaves occurring together – known as “compound” events – have “surged” across the world since the early 2000s, a new study shows.
Compound drought and heat events (CDHEs) can have devastating effects, creating the ideal conditions for intense wildfires, such as Australia’s “Black Summer” of 2019-20 where bushfires burned 24m hectares and killed 33 people.
The research, published in Science Advances, finds that the increase in CDHEs is predominantly being driven by events that start with a heatwave.
The global area affected by such “heatwave-led” compound events has more than doubled between 1980-2001 and 2002-23, the study says.
The rapid increase in these events over the last 23 years cannot be explained solely by global warming, the authors note.
Since the late 1990s, feedbacks between the land and the atmosphere have become stronger, making heatwaves more likely to trigger drought conditions, they explain.
One of the study authors tells Carbon Brief that societies must pay greater attention to compound events, which can “cause severe impacts on ecosystems, agriculture and society”.
Compound events
CDHEs are extreme weather events where drought and heatwave conditions occur simultaneously – or shortly after each other – in the same region.
These events are often triggered by large-scale weather patterns, such as “blocking” highs, which can produce “prolonged” hot and dry conditions, according to the study.
Prof Sang-Wook Yeh is one of the study authors and a professor at the Ewha Womans University in South Korea. He tells Carbon Brief:
“When heatwaves and droughts occur together, the two hazards reinforce each other through land-atmosphere interactions. This amplifies surface heating and soil moisture deficits, making compound events more intense and damaging than single hazards.”
CDHEs can begin with either a heatwave or a drought.
The sequence of these extremes is important, the study says, as they have different drivers and impacts.
For example, in a CDHE where the heatwave was the precursor, increased direct sunshine causes more moisture loss from soils and plants, leading to a drought.
Conversely, in an event where the drought was the precursor, the lack of soil moisture means that less of the sun’s energy goes into evaporation and more goes into warming the Earth’s surface. This produces favourable conditions for heatwaves.
The study shows that the majority of CDHEs globally start out as a drought.
In recent years, there has been increasing focus on these events due to the devastating impact they have on agriculture, ecosystems and public health.
In Russia in the summer of 2010, a compound drought-heatwave event – and the associated wildfires – caused the death of nearly 55,000 people, the study notes.
The record-breaking Pacific north-west “heat dome” in 2021 triggered extreme drought conditions that caused “significant declines” in wheat yields, as well as in barley, canola and fruit production in British Columbia and Alberta, Canada, says the study.
Increasing events
To assess how CDHEs are changing, the researchers use daily reanalysis data to identify droughts and heatwaves events. (Reanalysis data combines past observations with climate models to create a historical climate record.) Then, using an algorithm, they analyse how these events overlap in both time and space.
The study covers the period from 1980 to 2023 and the world’s land surface, excluding polar regions where CDHEs are rare.
The research finds that the area of land affected by CDHEs has “increased substantially” since the early 2000s.
Heatwave-led events have been the main contributor to this increase, the study says, with their spatial extent rising 110% between 1980-2001 and 2002-23, compared to a 59% increase for drought-led events.
The map below shows the global distribution of CDHEs over 1980-2023. The charts show the percentage of the land surface affected by a heatwave-led CDHE (red) or a drought-led CDHE (yellow) in a given year (left) and relative increase in each CDHE type (right).
The study finds that CDHEs have occurred most frequently in northern South America, the southern US, eastern Europe, central Africa and south Asia.
Threshold passed
The authors explain that the increase in heatwave-led CDHEs is related to rising global temperatures, but that this does not tell the whole story.
In the earlier 22-year period of 1980-2001, the study finds that the spatial extent of heatwave-led CDHEs rises by 1.6% per 1C of global temperature rise. For the more-recent period of 2022-23, this increases “nearly eightfold” to 13.1%.
The change suggests that the rapid increase in the heatwave-led CDHEs occurred after the global average temperature “surpasse[d] a certain temperature threshold”, the paper says.
This threshold is an absolute global average temperature of 14.3C, the authors estimate (based on an 11-year average), which the world passed around the year 2000.
Investigating the recent surge in heatwave-leading CDHEs further, the researchers find a “regime shift” in land-atmosphere dynamics “toward a persistently intensified state after the late 1990s”.
In other words, the way that drier soils drive higher surface temperatures, and vice versa, is becoming stronger, resulting in more heatwave-led compound events.
Daily data
The research has some advantages over other previous studies, Yeh says. For instance, the new work uses daily estimations of CDHEs, compared to monthly data used in past research. This is “important for capturing the detailed occurrence” of these events, says Yeh.
He adds that another advantage of their study is that it distinguishes the sequence of droughts and heatwaves, which allows them to “better understand the differences” in the characteristics of CDHEs.
Dr Meryem Tanarhte is a climate scientist at the University Hassan II in Morocco, and Dr Ruth Cerezo Mota is a climatologist and a researcher at the National Autonomous University of Mexico. Both scientists, who were not involved in the study, agree that the daily estimations give a clearer picture of how CDHEs are changing.
Cerezo-Mota adds that another major contribution of the study is its global focus. She tells Carbon Brief that in some regions, such as Mexico and Africa, there is a lack of studies on CDHEs:
“Not because the events do not occur, but perhaps because [these regions] do not have all the data or the expertise to do so.”
However, she notes that the reanalysis data used by the study does have limitations with how it represents rainfall in some parts of the world.
Compound impacts
The study notes that if CDHEs continue to intensify – particularly events where heatwaves are the precursors – they could drive declining crop productivity, increased wildfire frequency and severe public health crises.
These impacts could be “much more rapid and severe as global warming continues”, Yeh tells Carbon Brief.
Tanarhte notes that these events can be forecasted up to 10 days ahead in many regions. Furthermore, she says, the strongest impacts can be prevented “through preparedness and adaptation”, including through “water management for agriculture, heatwave mitigation measures and wildfire mitigation”.
The study recommends reassessing current risk management strategies for these compound events. It also suggests incorporating the sequences of drought and heatwaves into compound event analysis frameworks “to enhance climate risk management”.
Cerezo-Mota says that it is clear that the world needs to be prepared for the increased occurrence of these events. She tells Carbon Brief:
“These [risk assessments and strategies] need to be carried out at the local level to understand the complexities of each region.”
The post Heatwaves driving recent ‘surge’ in compound drought and heat extremes appeared first on Carbon Brief.
Heatwaves driving recent ‘surge’ in compound drought and heat extremes
Greenhouse Gases
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