What does the potentially emerging energy crisis mean for Europe? Yesterday I was in a media briefing with 75 journalists. Here is a snippet of what I told them.

Heute ist #WorldWildlifeDay 🐦 Kollisionen mit Glasstrukturen töten in Deutschland schätzungsweise 18–115 Mio. Vögel pro Jahr. Im Projekt EcoGlassBird @smartenwinter.bsky.social analysieren wir gemeinsam mit der Wildvogelhilfe Leipzig Vogelschlagnachweise in Leipzig. (1/3)

🌎 The 𝗻𝗲𝘅𝘁 𝗸𝗲𝘆𝗻𝗼𝘁𝗲 𝘀𝗽𝗲𝗮𝗸𝗲𝗿 that the 𝗖𝗕𝗖 𝗖𝗼𝗻𝗳𝗲𝗿𝗲𝗻𝗰𝗲 will have the honor of presenting is 𝗣𝗿𝗼𝗳. 𝗗𝗿. 𝗞𝗲𝗹𝗹𝘆 𝗙𝗶𝗲𝗹𝗱𝗶𝗻𝗴 (Professor at the School of Communication and Arts, 𝗨𝗻𝗶𝘃𝗲𝗿𝘀𝗶𝘁𝘆 𝗼𝗳 𝗤𝘂𝗲𝗲𝗻𝘀𝗹𝗮𝗻𝗱, Australia).

The 𝗻𝗲𝘅𝘁 𝗸𝗲𝘆𝗻𝗼𝘁𝗲 𝘀𝗽𝗲𝗮𝗸𝗲𝗿 that the 𝗖𝗕𝗖 𝗖𝗼𝗻𝗳𝗲𝗿𝗲𝗻𝗰𝗲 will have the honor of presenting is 𝗣𝗿𝗼𝗳. 𝗗𝗿. 𝗠𝗼𝗿𝗶𝘁𝘇 𝗔. 𝗗𝗿𝘂𝗽𝗽 ( @moritzdrupp.bsky.social, 𝗦𝘂𝘀𝘁𝗮𝗶𝗻𝗮𝗯𝗶𝗹𝗶𝘁𝘆 𝗘𝗰𝗼𝗻𝗼𝗺𝗶𝗰𝘀, 𝗘𝗧𝗛 𝗭𝘂𝗿𝗶𝗰𝗵 @ethz.ch)

🌍 The 𝗻𝗲𝘅𝘁 𝗸𝗲𝘆𝗻𝗼𝘁𝗲 𝘀𝗽𝗲𝗮𝗸𝗲𝗿 that the 𝗖𝗕𝗖 𝗖𝗼𝗻𝗳𝗲𝗿𝗲𝗻𝗰𝗲 will have the honor of presenting is 𝗣𝗿𝗼𝗳. 𝗜𝘀𝗮𝗯𝗲𝗹 𝗠𝗮𝗿𝘁𝗶𝗻𝗲𝘇 𝗖𝗮𝗻𝗼 (𝗦𝗽𝗮𝗻𝗶𝘀𝗵 𝗡𝗮𝘁𝗶𝗼𝗻𝗮𝗹 𝗥𝗲𝘀𝗲𝗮𝗿𝗰𝗵 𝗖𝗼𝘂𝗻𝗰𝗶𝗹) – Ecology and Earth Systems Modelling

The wave of green that sweeps Earth from the north in boreal summer to the south in austral summer is shifting due to climate change. Researchers found the centroid of the wave moving northward since 1982 and eastward since 2010. In PNAS: https://ow.ly/PjPU50YmYKz

with the info of cloud condensation nuclei within boundary layer, aerosol forcing uncertainty can reduce by 1/3. Very much looking forward to such products from satellite. Thanks to all collaborators for this exciting work!

🌏 The 𝗻𝗲𝘅𝘁 𝗸𝗲𝘆𝗻𝗼𝘁𝗲 𝘀𝗽𝗲𝗮𝗸𝗲𝗿 that the 𝗖𝗕𝗖 𝗖𝗼𝗻𝗳𝗲𝗿𝗲𝗻𝗰𝗲 will have the honor of presenting is 𝗣𝗿𝗼𝗳. 𝗗𝗿. 𝗛𝗮𝗻𝘀 𝗩𝗲𝗿𝗯𝗲𝗲𝗰𝗸 (@hans-verbeeck.bsky.social, Faculty of Bioscience Engineering, 𝗗𝗲𝗽𝗮𝗿𝘁𝗺𝗲𝗻𝘁 𝗼𝗳 𝗘𝗻𝘃𝗶𝗿𝗼𝗻𝗺𝗲𝗻𝘁, 𝗚𝗵𝗲𝗻𝘁 𝗨𝗻𝗶𝘃𝗲𝗿𝘀𝗶𝘁𝘆)

New study by @hailingjia.bsky.social, collaboration between @sronspace.bsky.social @meteoleipzig.bsky.social and others: how to obtain best satellite info about cloud condensation nuclei to quantify aerosol-cloud interactions: assimilation for vertical resolution www.science.org/doi/10.1126/...

🌎 The 𝗻𝗲𝘅𝘁 𝗸𝗲𝘆𝗻𝗼𝘁𝗲 𝘀𝗽𝗲𝗮𝗸𝗲𝗿 that the 𝗖𝗕𝗖 𝗖𝗼𝗻𝗳𝗲𝗿𝗲𝗻𝗰𝗲 will have the honor of presenting is 𝗣𝗿𝗼𝗳. 𝗟𝗶𝗲𝘀𝗷𝗲 𝗠𝗼𝗺𝗺𝗲𝗿 (𝗕𝗲𝗹𝗼𝘄𝗴𝗿𝗼𝘂𝗻𝗱 𝗘𝗰𝗼𝗹𝗼𝗴𝘆, 𝗪𝗮𝗴𝗲𝗻𝗶𝗻𝗴𝗲𝗻 𝗨𝗻𝗶𝘃𝗲𝗿𝘀𝗶𝘁𝘆 @w-u-r.bsky.social)

👇 𝗢𝗣𝗘𝗡 𝗖𝗔𝗟𝗟 𝗙𝗢𝗥 𝗔𝗕𝗦𝗧𝗥𝗔𝗖𝗧𝗦 🌍 𝗖𝗕𝗖 𝗖𝗼𝗻𝗳𝗲𝗿𝗲𝗻𝗰𝗲 𝟮𝟬𝟮𝟲 - 𝗖𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗻𝗴 𝗕𝗶𝗼𝗱𝗶𝘃𝗲𝗿𝘀𝗶𝘁𝘆, 𝗖𝗹𝗶𝗺𝗮𝘁𝗲, 𝗮𝗻𝗱 𝗛𝘂𝗺𝗮𝗻 𝗕𝗲𝗵𝗮𝘃𝗶𝗼𝘂𝗿 📆 𝗗𝗲𝗮𝗱𝗹𝗶𝗻𝗲: 𝟭𝟰 𝗔𝗽𝗿𝗶𝗹 🔗 cbc-conference.org Please share this with your colleagues 🙏 @ufz.de @unileipzig.bsky.social

Excited to announce our new publication on #aerosol #cloud #interactions 👇 Proud to lead this perspective with great experts from the field @cleancloud-he.bsky.social @certainty-aci.bsky.social #ESA-AIRSENSE agupubs.onlinelibrary.wiley.com/doi/full/10....

Very happy to finally share a paper that has been in my mind for a long time 🌍 🔗 www.pnas.org/doi/10.1073/...

🌍 The earth’s green is increasing and its centre is moving north-east. Vegetational shift to the north is even stronger in the southern summer – surprising new facet of #globalgreening 🌱 Published in PNAS 1/x

Connections between biodiversity and climate (CBC): check out the conference we are organising in Leipzig: @cbc-conference.bsky.social cbc-conference.org Lineup of fantastic keynote speakers from different disciplines, sessions across different facets of CBC! @unileipzig.bsky.social @ufz.de

Haha. This is GOLD! 7 of the most common arguments against climate action demolished with simple facts in just one minute. 🔥 Give it a watch. Then share it! #ClimateSky #auspol youtube.com/shorts/aCG-f...

#CBC2026 #Biodiversity #ClimateScience #BehaviouralScience @unileipzig.bsky.social @ufz.de @idiv-research.bsky.social

𝗦𝗔𝗩𝗘 𝗧𝗛𝗘 𝗗𝗔𝗧𝗘!!!! 🌍 CBC Conference 2026 – Connecting Biodiversity, Climate & Human Behaviour 📅 September 21–24, 2026 📍 Leipzig, Germany The CBC2026 conference will bring together researchers from biodiversity, climate and behavioural sciences to explore how these fields connect.

Clouds affect photosynthesis: they reduce sunlight but also supply rain. So are clouds good or bad for plants? New paper shows that it depends on water availability. Clouds will shrink in the warming future. That makes vegetation decline in arid regions and increase in humid regions. rdcu.be/e3TmT

The scientific understanding of human-driven climate change is much stronger today than it was in 2009 when the EPA first issued the endangerment finding. There is no scientific basis for the Trump administration's decision to repeal it

Reminder: today is the deadline to apply for the 14 PhD positions in our Research Training Group "Economics of connected natural commons: Atmosphere and Biodiversity" www.uni-leipzig.de/en/economics... www.eco-n.org

Very embarrising day for EU. It is incomprehensible how parliamentarians, precisely on the days when Trump is reaching out to Greenland, fail to understand what is at stake.

Currently 2 important positions in German climate/atmospheric science are advertised: Director of the Leibniz-Institute for Tropospheric Research (www.uni-leipzig.de/en/universit...) and Director of the German Climate Computing Centre (DKRZ, www.uni-hamburg.de/en/stellenan...)

Loooooong applause - and then a standing ovation - at the European Parliament this evening, as President president @president.europarl.europa.eu says Europe is resolute in defending the status and sovereignty of Denmark and Greenland

Recommended read: A commentary co-authored by climate scientist Prof @clequere.bsky.social in Nature argued that several climate trends have locked in “irreversible progress in climate action”.

IWH Research Seminar in #Economics with Gauthier Vermandel (@vermandel.bsky.social, Ecole Polytechnique) 📢 The New Keynesian #Climate Model 📅 Tuesday, January 13, 2:15 pm CET ▶️ Join us via Zoom! Please register here to get your link: www.iwh-halle.de/en/about-the... #climatechange #climatepolicy

Humans have emitted 2750 gigatons of CO2 since the industrial revolution from burning fossil fuels and land use change. To put this in perspective, this is more than the (dry) mass of all living things on earth and everything humans have ever built combined:

📢 Postdoc Opportunity to study large-scale dynamic and thermodynamic conditions influencing the risk of cyclones of tropical origin 🌀 reaching Western Europe 📍 Joint post: Universities of Oxford & Edinburgh ⏰ Apply by 15 Jan 2026 (noon GMT) Details & apply 👉 my.corehr.com/pls/uoxrecru...

Attacking NCAR is enormously self-destructive for America. NCAR is the leading centre in weather and climate research in the world. We Europeans often travel to NCAR to collaborate, discuss and learn. Hurting the centre will cause damage that is irreversible for years to decades with global impact.

The DFG research training group on the Economics of Connected Natural Commons: Atmosphere and Biodiversity (ECO-N) at Leipzig University is happy to announce vacancies for another 14 doctoral researcher positions. www.eco-n.org uni-leipzig.b-ite.careers/jobposting/9... @unileipzig.bsky.social

New paper alert: b.tellusjournals.se/articles/10.... Aerosols have an actual warming effect in the Arctic in winter: Changed dynamics via shift in the jet stream position (which in turn projects on the Arctic Oscillation index —> more positive) @jquaas.bsky.social @khaustein.bsky.social

Great study by our iDiv colleagues: biodiversity in forests helps to mitigate impacts of climate change

What if we had no electricity and everything ran on fossil fuels? This ad keeps making me chuckle. Enjoy if you have not seen it or rewatch as it is just gold.

Dokumentation über Klima und Amazonas mit der super Kollegin Mira Pöhlker @tropos-de.bsky.social @meteoleipzig.bsky.social

A joint job offer is open for Junior Professorship Financial Economics @unileipzig.bsky.social together with the excellent @iwh-halle.bsky.social Really interesting focus on sustainability, links to biodiversity and climate: www.uni-leipzig.de/en/universit...

It was a call I couldn't ignore. I was formally invited by the Danish EU Presidency to Luxembourg to speak about industrial electrification and energy efficiency directly to the energy ministers from every single one of the 27 EU member states on the 20th of October. www.youtube.com/watch?v=FO30...

Last week the German Meteorological Society warned that "the 3-degree limit could be exceeded as early as 2050". While not possible to fully rule out, the assessed warming scenarios we published in the IPCC AR6 report find this to be extremely unlikely.

That's really great, congratulations! And I'm happy my colleague Made Maahn @meteoleipzig.bsky.social helps make it happen!

The national project "WarmWorld" works on the new-generation global climate simulations at resolutions as high as 1 km. At @kit.edu a group of us met to discuss how to represent the cloud processes in clouds in such computationally-demanding models, to account for pollution effects on climate.

Currently at the annual meeting of the "Arctic amplification" collaborative research project. Discussion on how increases in convection in the Arctic make it more "tropical" with warming. ac3-tr.de funded by @dfg.de, partners @meteoleipzig.bsky.social, U Bremen, Köln, @awi.de, @tropos-de.bsky.social

In a UN speech today, President Trump said that "all of these [climate] predictions were wrong". Back in 2019 I led a research effort to digitize old climate model projections and assess how well they did. Turns out they got future warming pretty spot on!

Since one year, the Research Training Group "Economics of connected natural commons" studies the challenges of sustainably using ecosystems and the climate system as commons. We just come back from the first retreat between the 14 PhD candidates, advisers, and excellent invited external speakers.

The current Advanced Training Module on "Climate Attribution", joinly by our interdisciplinary research training group "Economics of Connected Natural Commons" and the Leipzig Graduate school on Clouds, aerosols and radiation sparked large interest: 65 PhD researchers from 7 countries!

Great piece from Nadir Jeevanjee. As a meteorologist I of course love it when forecasts prove correct but as a citizen I would have preferred it if climate change had been prevented on the basis of the forecasts

Cloud drop number is a key quantity to understand cloud processes. Getting it from satellites so far was very indirect. Gonzalez et al. @meteoleipzig.bsky.social @scadsai.bsky.social now created a machine-learning method to get it directly from satellite radiances ieeexplore.ieee.org/document/111...

I'm glad to contribute again!

Imagine all cars were electric, and then one Volkswagen engineer comes up with another idea … #EMobility

How does cloud drop size distribution respond to aerosol? Hengqi Wang, visiting PhD researcher from Tsinghua university, used new data from satellite measurements of polarization from SRON/Netherlands to quantify the effect. Offsets systematically 7% of the aerosol-cloud forcing. rdcu.be/ezaeX

As @pkrugman.bsky.social writes, this is a deliberate effort to destroy science.