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Annika Högner

@hoegner.bsky.social
84 followers 81 following 5 posts

🌱🌏 Researcher at @iiasa.ac.at 🌞🌱

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Reposted by Annika Högner
Astronomer Royal for Scotland | Catherine Heymans @astroroyalscot.bsky.social · 20h
So sad to hear that the iconic, trailblazing, Apollo 11 moon landing software engineering lead, Margaret Hamilton, is no longer with us. Love this image of her, standing next to a print out of the software that landed Buzz Aldrin and Neil Amstrong on the moon! 👩‍🔬🔭🛰️🧪 ℹ️: www.bbc.co.uk/news/article...
A woman looking very cool in a 70's dress standing next to a massive pile of very thick books
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Andreas Sieber @andreassieber.bsky.social · 21/08/2026
👀 Hard to overstate these news: #China might host the most important #climate summit of the decade. In tough times for multilateralism they would elevate the conference to a new level and are potentially the only host who can form a credible response to either outcome of the #US elections in 2028
bloomberg.com
China Said to Weigh Potential Bid to Host 2028 UN Climate Summit
China is considering a proposal to host the annual United Nations climate summit in 2028, a move that would signal the country’s intent to show greater global leadership on the issue.
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Michaela Krömer @michaelakroemer.bsky.social · 20/08/2026
Der ÖVP-Entwurf zum Klimaschutzgesetz soll Klimaklagen ausschließen. Das halte ich für verfassungswidrig. Im Rechtsstaat kann jede Person vor Gericht prüfen lassen, ob sich der Staat an seine Gesetze hält. sonst kann Klimaschutz eine Absichtserklärung bleiben. 1 www.derstandard.at/story/300000...
derstandard.at
Klimaanwältin befürchtet verfassungswidriges Klimaschutzgesetz
Ein Regierungs-Entwurf schließt Klimaklagen aus. Klimaschutzanwältin Michaela Krömer hält das für verfassungswidrig
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Peter Pfleiderer @klimapeter.bsky.social · 17/08/2026
What is changing with extreme European summers? 🥵 We look at many simulated 100-year summers in western Europe to find out how current day extreme summers differ from similarly rare pre-industrial summers. @robinnoyelle.bsky.social and @sebastian-sippel.bsky.social doi.org/10.1029/2026...
doi.org
Heat Extremes Within Hot Summer Seasons Intensify More Than in Average Summers Under Global Warming
Rare heat summers today (with ≈ 100-year return period) show a different evolution of sub-seasonal temperatures than similarly rare summers in pre-industrial climate. Faster drying of soils in cu...
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Greenpeace Luxembourg @greenpeacelux.bsky.social · 10/08/2026
Big Oil is literally burning the planet for profit. We are not mad enough. Governments must finally make big polluters pay for the damage they are causing. #MakePollutersPay
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Carl Schleussner @carlschleussner.bsky.social · 30/07/2026
Incredibly proud of this major milestone in climate impact emulation. We can now provide climate risks for dozens of indicators almost in real time. Made possible by a fantastic team around Niklas Schwind, Mia Werning, Mahé Perrette, Ed Byers and many others! 👏👏👏
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Daniel Huppmann @danielhuppmann.bsky.social · 23/07/2026
Friendly reminder: a consortium led by Piers Forster @cjsmith.eu @wflamb.bsky.social @robinlamboll.bsky.social et al. and funded by @copernicusecmwf.bsky.social compiled the data on the global climate system... And the #ScenarioServices team at @iiasa.ac.at put together an interactive dashboard!
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Karl Scheifinger @karlscheifinger.bsky.social · 20/07/2026
More than 60 years ago, the fossil fuel industry sponsored climate research. Industry leaders were amongst the first to realize the effects their products have on our planet's climate. And they decided to act. To act and save their business model, unfortunately.
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Alexander Lees @alexanderlees.bsky.social · 13/07/2026
Our new commentary rdcu.be/ftx6h in @natecoevo.nature.com written with folks from @inaturalist.bsky.social and @cornellbirds.bsky.social shows that use of AI to manipulate existing or create new wildlife images undermines the huge value of vast citizen science databases. 🌍🪰🪶 #Ornithology 🧵 1/10
rdcu.be
Citizen science platforms must mitigate against the threat of generative AI
Nature Ecology & Evolution - Citizen science platforms must mitigate against the threat of generative AI
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Robin Lamboll @robinlamboll.bsky.social · 08/07/2026
1/ Predictions of future climate improve over time, but this shouldn't weaken the Paris Agreement. But in several widespread interpretations of "well below 2C", it does. New (short!) paper with @joerirogelj proposes a fix. www.nature.com/articles/s41... 🧵
nature.com
Future-proofing interpretations of the Paris Agreement’s limit of well below 2 °C - Nature Climate Change
Here the authors show that a common interpretation of the Paris Agreement’s ‘well below 2° C’ target is changing with time, which could lead to higher overall warming. They propose that using median t...
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Emily Theokritoff @etheokritoff.bsky.social · 04/06/2026
How are impacts from extreme weather events linked to climate change? How much responsibility do large emitters such as companies or countries carry? How do scientists go about calculating these things & how is it then interpreted by lawyers in climate litigation cases? 🌪️ ⚖️
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🌍⚖️ Sébastien Duyck @duycks.bsky.social · 22/05/2026
⚖️ 🌍 ⚡ 𝐅𝐨𝐥𝐥𝐨𝐰 𝐰𝐢𝐭𝐡 𝐮𝐬 𝐢𝐧 𝐫𝐞𝐚𝐥 𝐭𝐢𝐦𝐞 𝐟𝐫𝐨𝐦 🇳🇱 𝐓𝐡𝐞 𝐇𝐚𝐠𝐮𝐞: 𝐭𝐨𝐝𝐚𝐲, 𝐭𝐡𝐞 𝐃𝐮𝐭𝐜𝐡 𝐒𝐮𝐩𝐫𝐞𝐦𝐞 𝐂𝐨𝐮𝐫𝐭 𝐡𝐞𝐚𝐫𝐬 𝐨𝐧𝐞 𝐨𝐟 𝐭𝐡𝐞 𝐦𝐨𝐬𝐭 𝐜𝐨𝐧𝐬𝐞𝐪𝐮𝐞𝐧𝐭𝐢𝐚𝐥 𝐜𝐥𝐢𝐦𝐚𝐭𝐞 𝐜𝐚𝐬𝐞𝐬 𝐢𝐧 𝐭𝐡𝐞 𝐰𝐨𝐫𝐥𝐝, @milieudefensie.bsky.social et al. v. Shell. #ClimateJustice #ClimateCaseShell 🧵 ⬇️ analysis in thread below
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David Ho @davidho.bsky.social · 02/05/2026
Yes, if AMOC shuts down, it may release hundreds of billions of tonnes of CO₂. You know what's guaranteed to release hundreds of billions of tonnes of CO₂ in the next few years? Our continued use of fossil fuels.
newscientist.com
Collapse of key ocean current may release billions of tonnes of carbon
If the Atlantic Meridional Overturning Circulation shut down, the knock-on effects could release hundreds of billions of tonnes of CO2, raising global temperatures even further
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Emily Theokritoff @etheokritoff.bsky.social · 28/04/2026
The climate #litigation pico session and splinter meeting are back at #EGU26! ⚖️ We’re looking forward to another round of enriching, highly interdisciplinary talks and discussions. Based on this year’s impressive line-up of abstracts and speakers, it’s set to be a great one.
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William F. Lamb @wflamb.bsky.social · 24/04/2026
I have updated Tidy GHG Inventories - a dataset of greenhouse gas emissions based on country submissions to the UNFCCC. Summary figures: lambwf.github.io/Tidy-GHG-Inv... Dataset: zenodo.org/records/1969... This version has much more detailed energy sector data⚡including the split by fossil fuel 🛢️
lambwf.github.io
Tidy GHG Inventories
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Climate Resource @climateresource.bsky.social · 23/03/2026
Big step for #CMIP7: the Rapid Evaluation Framework (REF) is taking shape, enabling faster, more systematic climate model evaluation for the #IPCC AR7 cycle. We've been working hard at: Better evaluation → more transparent models → stronger decisions. 🔗 www.linkedin.com/posts/climat...
linkedin.com
#rapidevaluationframework #cmip7modelbenchmarkingtaskteam | Climate Resource
We're proud to see Jared Lewis in Japan last week helping launch something the climate community has been talking about for years. The #RapidEvaluationFramework (REF) is now live, built to track how c...
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Norman J. Steinert @njsteinert.bsky.social · 19/02/2026
New review paper on "The implications of overshooting 1.5 °C on Earth system tipping elements" Main points: Overshooting 1.5°C raises risks of irreversible Earth-system tipping, which depends on peak warming and more so on how long critical thresholds are exceeded. doi.org/10.1088/1748...
iopscience.iop.org
The implications of overshooting 1.5 °C on Earth system tipping elements—a review
The implications of overshooting 1.5 °C on Earth system tipping elements—a review, Ritchie, Paul D L, Steinert, Norman J, Abrams, Jesse F, Alkhayuon, Hassan, Arnscheidt, Constantin W, Bochow, Nils, Chapman, Ruth R, Clarke, Joseph, Dennis, Donovan P, Donges, Jonathan F, Flores, Bernardo M, Garbe, Julius, Högner, Annika, Huntingford, Chris, Lenton, Timothy M, Lohmann, Johannes, Lux-Gottschalk, Kerstin, Milkoreit, Manjana, Möller, Tessa, Pearce-Kelly, Paul, Pereira, Laura, Quinn, Courtney, Schleussner, Carl-Friedrich, Stuenzi, Simone M, Swingedouw, Didier, Van der Laan, Larissa N, Zickfeld, Kirsten, Wunderling, Nico
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Carl Schleussner @carlschleussner.bsky.social · 28/01/2026
How should climate science and policy respond to a potential exceedance of 1.5°C? We provide our perspective on this in a new @Nature comment 🔗 nature.com/articles/d41586-026-00247-y led by Gaurav Ganti with Sabine Fuss, @joerirogelj.bsky.social, @setupelz.bsky.social & Keywan Riahi 1/
nature.com
Exceeding 1.5 °C requires rethinking accountability in climate policy
A scientific foundation is required to establish nations’ responsibilities in a hotter ‘overshoot’ world.
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Climate Resource @climateresource.bsky.social · 27/01/2026
US withdrawal from Paris takes effect today. Our new analysis shows progress, and defines the gap to 1.5°C that we can still (and must) close. The report: www.climate-resource.com/reports/ndcs... ; The summary: www.climate-resource.com/reports/ndcs...
climate-resource.com
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All Our Yesterdays @allouryesterdays.bsky.social · 23/01/2026
January 23, 1957 – New Zealand scientist warns about consequences of carbon dioxide build-up allouryesterdays.info/2023/01/22/j...
Newspaper article "Increase in Carbon Dioxide May Cause Floods" by Prof T.A. Rafter
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Ed Hawkins @edhawkins.org · 14/01/2026
Spiralling global temperatures (1850-2025) The last 3 years really jump out, rather like 2015-6 did when we first produced this graphic back then. Now, 2015-6 looks rather cool... More on the spiral: doi.org/10.1175/BAMS...
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Annika Högner @hoegner.bsky.social · 08/01/2026
Submissions for abstracts to EGU26 are open until next week. @imenke.bsky.social , @etheokritoff.bsky.social , Noah Walker-Crawford, @rosapietroiusti.bsky.social , and I are looking forward to your contributions to our climate science and litigation-themed outreach session.
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All Our Yesterdays @allouryesterdays.bsky.social · 05/01/2026
CO2 Newsletter Vol. 1 no. 1 (Oct 1979) is live! Between 1979 and 1982 American geologist William N. Barbat published 18 issues. Each was 8 pages of news (scientific abstracts, testimony, science and policy reports) editorials, investigations etc. 1/2 allouryesterdays.info/2026/01/05/c...
Front page of the first CO2 Newsletter, October 1979.

Image of a Keeling Curve and then an explanation "Why the CO2 Newsletter?"
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All Our Yesterdays @allouryesterdays.bsky.social · 23/12/2025
December 24, 1968 – “Earthrise” photo allouryesterdays.info/2022/12/23/d...
allouryesterdays.info
December 24, 1968 - "Earthrise" photo - All Our Yesterdays
On this day, December 24 in, 1968 the Earthrise photo showed our pale blue dot for what it is. [The amount of carbon dioxide in the atmosphere was 323ppm. At time of writing it was 419ishppm- but for ...
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Annika Högner @hoegner.bsky.social · 22/12/2025
And Christmas came early: Asmania et al took an important hurdle in their lawsuit against carbon major Holcim, which was today admitted to proceed to trial. Noone is above the law!
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Benjamin Braun @benbraun.social · 03/12/2025
“Playing the market”, but for real.
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Inga Menke @imenke.bsky.social · 07/11/2025
⚖️ Are you working on topics that could be relevant for climate litigation? ➡️ Submit an abstract to our outreach session (which allows you to submit a second abstract) #EGU26 meetingorganizer.copernicus.org/EGU26/sessio...
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Robert Gieseke (Openclimatedata) @openclimatedata.net · 03/11/2025
目标类型及描述。争取到 2035 年温室气体排放水平稳 中有降,比 2030 年下降 5%以上。 "Target type and description: Strive to achieve a stable to slightly reduced level of greenhouse gas emissions by 2035, with a decrease of more than 5% compared to 2030." (Google Translated.)
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Annika Högner @hoegner.bsky.social · 03/11/2025
very interesting! it might be worth it to consider renewables, too. their energy density is much lower comparing to fossil fuels, and i would assume that the ownership structures are also more local, less concentrated. this asymmetry would be very interesting to grasp
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Dr. Aaron Thierry @thierryaaron.bsky.social · 01/11/2025
I've finally got around to curating a selection of films about the #climate crisis 🎥 There's lot of mediocre climate films out there, but for me these stand out head & shoulders above the rest 🎞️ They make excellent resources for classrooms, lecture halls, or community cinema's 🎬 Thread:🧵Plz RT
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Emily Theokritoff @etheokritoff.bsky.social · 30/10/2025
This is how climate injustice unfolds. There is both an economic logic to cutting emissions now & a moral imperative to rapidly scale up international finance for loss and damage and adaptation in the most vulnerable countries.
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Center for International Environmental Law @ciel.org · 28/10/2025
🚨 BREAKING: The European Court of Human Rights @ECHR_CEDH has ruled in @GreenpeaceNorge and Others v. Norway. The decision is an important step for #ClimateJustice. Here’s why it matters 🧵
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Climate Resource @climateresource.bsky.social · 28/10/2025
Our new brief “Pre-COP30: how are temperatures tracking on the latest targets?” is here: www.climate-resource.com/reports/ndcs... #ClimateAction #COP30 #ClimateFinance
climate-resource.com
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Carl Schleussner @carlschleussner.bsky.social · 24/10/2025
Really important paper led by my @iiasa.ac.at colleague Alex Nauels www.nature.com/articles/s41... “The difference between decisive climate action today and continued high emissions is not just measured in degrees of warming but also in meters of sea-level rise” 👏👏👏
nature.com
Multi-century global and regional sea-level rise commitments from cumulative greenhouse gas emissions in the coming decades - Nature Climate Change
It is important to understand how much long-term sea-level rise is already committed due to historical and near-term emissions. Here the authors use a modelling framework to show how decisions on glob...
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Fridays for Future Germany @fridaysforfuture.de · 20/10/2025
Merz & Co wollen die EU-Klimaziele aufweichen?! Nicht mit uns 😡 In einem offenen Brief mit Wissenschaftler*innen fordern wir die Bundesregierung jetzt auf, sich für ein starkes Ziel von mind. 90% Reduktion bis 2040 einzusetzen & nicht noch zu verzögern! 👉 fridaysforfuture.de/offener-brie...
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Ed Hawkins @edhawkins.org · 16/10/2025
A request for weather interested volunteers! Met Eireann would like to rescue millions of weather observations taken in Ireland over many decades that are still stuck on paper. #WeatherRescue Anyone can help: www.zooniverse.org/projects/met...
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Gavin Schmidt @climateofgavin.bsky.social · 09/10/2025
This is a good corrective to the BS narrative flowing through the Pielke/AEI/NYP/EID/DOE nexus. Their argument is designed so that we can never ever attribute extreme events to emissions - even singular events that would have *never* [for some suitable finite approximation] have happened before.
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Carl Schleussner @carlschleussner.bsky.social · 08/10/2025
Super comprehensive report on our @iiasa.ac.at overshoot conference by @carbonbrief.org. Great summary and overview on some of the central discussion points. Check it out👇👇👇 www.carbonbrief.org/overshoot-ex...
carbonbrief.org
Overshoot: Exploring the implications of meeting 1.5C climate goal ‘from above’ - Carbon Brief
The first-ever international conference on the contentious topic of “overshoot” was held last week in...
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Gregor Semieniuk @gregorsemieniuk.bsky.social · 08/10/2025
🚨NEW PAPER🚨 We all know the 2022 energy price shock fueled the cost of living crisis. It also caused a profit bonanza for the very rich. We show the US reaped the largest profits ($377bn) of any country. 50% went to the richest 1%, only 1% to the bottom 50%. A🧵 www.sciencedirect.com/science/arti...
River or sankey diagram showing the allocation of profits from global oil and gas companies to quantiles of the US wealth size distribution via financial system intermediaries, such as asset managers, and categories of ultimate beneficiaries, such as business owners, pension funds and shareholders in listed companies. The scale is hundreds of billions of US dollars, and ultimately 50.4% of profits reaching the US personal wealth distribution go to the richest 1% of households.
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Marina Andrijevic @andrijevic.bsky.social · 09/09/2025
In the lead up to the Overshoot Conference @iiasa.ac.at Sep 30-Oct 2, the organizers had a fantastic nerdy idea to get the leading experts in their fields share their perspectives on the key themes. Highly recommend for your daily commute, background to cooking etc.: open.spotify.com/show/5MpXqh1...
open.spotify.com
Episode 2: Highest Possible Ambition under Overshoot with Joeri Rogelj
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🌍⚖️ Sébastien Duyck @duycks.bsky.social · 02/09/2025
⚡ ⚖️ 🌐 upcoming #𝐂𝐥𝐢𝐦𝐚𝐭𝐞𝐋𝐢𝐭𝐢𝐠𝐚𝐭𝐢𝐨𝐧: Asmania v. Holcim Crucial hearing upcoming in Switzerland, this could set a precedent for holding climate polluters accountable. 📅 Wed, 3 Sept 2025 – starting at 8:30 am CEST 📍 Cantonal Parliament of Zug🇨🇭 👇 A brief thread🧵
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Yi-Ling Hwong @yilinghwong.bsky.social · 25/07/2025
🔥 Just published! 🔥 Our new manuscript on global #wildfires look beyond burned areas and ask: What drives the #economic damages of wildfires — now & in the future? We find that socioeconomic vulnerability, not just #climate, is key. 📄 iopscience.iop.org/article/10.1... (Highlights below ⬇️)
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Carl Schleussner @carlschleussner.bsky.social · 11/07/2025
*** Faktencheck*** In der Generaldebatte im Bundestag sprach Bundeskanzler Friedrich #Merz auch zum Klimaschutz. Er sagte: "Selbst wenn wir alle morgen klimaneutral wären, würde keine einzige Naturkatastrophe weniger geschehen". Ein Faktencheck. 1/
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Annika Högner @hoegner.bsky.social · 10/06/2025
New study out, in which we detect a causal link in reanalysis+observational data from an AMOC SST index to the Southern Amazon rainforest: dry season precipitation increases when the AMOC weakens. doi.org/10.1088/1748...
doi.org
Causal pathway from AMOC to Southern Amazon rainforest indicates stabilising interaction between two climate tipping elements - IOPscience
Causal pathway from AMOC to Southern Amazon rainforest indicates stabilising interaction between two climate tipping elements, Högner, Annika, Di Capua, Giorgia, Donges, Jonathan F, Donner, Reik V, Feulner, Georg, Wunderling, Nico
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IIASA @iiasa.ac.at · 09/06/2025
🌎 New research led by IIASA researcher @hoegner.bsky.social shows a link between two major climate tipping elements: the Southern Amazon rainforest and the Atlantic Meridional Overturning Circulation (AMOC). 👉 iiasa.ac.at/news/jun-202... @pik-potsdam.bsky.social @ioppublishing.bsky.social
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Gregory Munday @gergmunday.bsky.social · 12/05/2025
New paper on the risks of forest ecosystem impacts under emissions pathways designed to meet the Paris Agreement temperature goals is out today in Nature Climate Change! 🌳 Read it here: www.nature.com/articles/s41558-025-02327-9
nature.com
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Annika Högner @hoegner.bsky.social · 07/05/2025
congrats @sarahschoengart.bsky.social & team !!
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Departement Umweltsystemwissenschaften (D-USYS), ETH Zürich @usyseth.bsky.social · 07/05/2025
💰🌍 Research by Sarah Schöngart et al. shows the wealthiest 10% caused TWO-THIRDS of global warming since 1990. The top 1% have an even bigger impact on extreme weather like #heatwaves and #droughts, hitting vulnerable regions hardest. usys.ethz.ch/en/news-even...
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Carl Schleussner @carlschleussner.bsky.social · 19/03/2025
🌍 SAVE THE DATE! Excited to announce that we'll be hosting the first-ever Climate Overshoot Conference at @iiasa.ac.at from Sep 30th - Oct 2nd, 2025. Thrilled to bring this critical conversation to Laxenburg/Vienna. 1/ iiasa.ac.at/events/sep-2...
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