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! 👏👏👏

IIASA@iiasa.ac.at · 6d ago

Climate decisions should be based on an ensemble of projections, not a single future. A new open-source tool developed by IIASA researchers and partners makes it much faster to generate regional climate and impact projections while capturing uncertainty. 👉 iiasa.ac.at/news/jul-202...

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!

Daniel Huppmann@danielhuppmann.bsky.social · 2mo ago

What's the status of the global climate system? 🌍 And what's our role in the changing world? Check out our new dashboard based on the "Indicators of Global Climate Change 2025" (Forster et al. 2026). Powered by @iiasa.ac.at Funded by @copernicusecmwf.bsky.social 👉 indicators.climate.copernicus.eu

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.

Center for International Environmental Law@ciel.org · 3w ago

When did States know enough to act on climate change? That question is no longer just historical. It's increasingly a legal one. Our 🆕 report provides evidence that many governments knew about fossil fuel-driven climate change far before they admitted: www.ciel.org/reports/what... 🧵

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

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

rdcu.be

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... 🧵

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...

nature.com

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? 🌪️ ⚖️

⚖️ 🌍 ⚡ 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

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.

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

newscientist.com

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.

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 🛢️

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...

#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...

linkedin.com

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...

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

iopscience.iop.org

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/

Exceeding 1.5 °C requires rethinking accountability in climate policy

A scientific foundation is required to establish nations’ responsibilities in a hotter ‘overshoot’ world.

nature.com

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...

January 23, 1957 – New Zealand scientist warns about consequences of carbon dioxide build-up allouryesterdays.info/2023/01/22/j...

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...

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.

⚖️ 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...

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...

December 24, 1968 – “Earthrise” photo allouryesterdays.info/2022/12/23/d...

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 ...

allouryesterdays.info

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!

🌍⚖️ Sébastien Duyck@duycks.bsky.social · 8mo ago

⚡ ⚖️ 🌍 𝐈𝐦𝐩𝐨𝐫𝐭𝐚𝐧𝐭 #𝐂𝐥𝐢𝐦𝐚𝐭𝐞𝐋𝐢𝐭𝐢𝐠𝐚𝐭𝐢𝐨𝐧 𝐩𝐫𝐨𝐜𝐞𝐝𝐮𝐫𝐚𝐥 𝐰𝐢𝐧 in🇨🇭Swiss case vs. carbon major. Judges validated legal theories underpinning the case brought by 4 Indonesian islanders against Holcim and accepted all claims as admissible, clearing path to judgment on the merits. 🧵details in thread below 👇

“Playing the market”, but for real.

Jake Grumbach@jakemgrumbach.bsky.social · 8mo ago

After becoming a congressional leader, a politician’s stock portfolio beats out those of peers by 47 (!!!) percentage points a year through trades timed around bills and firms that later get government contracts www.nber.org/papers/w34524 via @florianederer.bsky.social

⚖️ 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...

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.)

Robert Gieseke (Openclimatedata)@openclimatedata.net · 9mo ago

🇨🇳 China's NDC is out. unfccc.int/sites/defaul...

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

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.

Grantham Institute - Climate Change and the Environment@granthamicl.bsky.social · 9mo ago

⚠️Climate change made Hurricane Melissa four times more likely, rapid study estimates The most powerful storm in Jamaica’s history shows how climate change is increasing the economic cost, intensity, and likelihood of major storms 🧵 ow.ly/Kazp50Xke8N

🚨 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 🧵

Our new brief “Pre-COP30: how are temperatures tracking on the latest targets?” is here: www.climate-resource.com/reports/ndcs... #ClimateAction #COP30 #ClimateFinance

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” 👏👏👏

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...

nature.com

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...