Johannes Quaas

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)

Photo of Kelly Fielding with the text below: "Keynote Speaker: Prof. Dr. Kelly Fielding's research focuses broadly on understanding the social and psychological determinants of environmental sustainability. She seeks to understand environmental decisions and behaviours and to develop communication and behaviour change strategies that can promote greater environmental sustainability. A key focus of her current research is on sustainable urban water management, specifically, how we can engage communitites with this issue."

Poster for the CBC 2026: Conference on Connecting Biodiversity, Climate and Human Behaviour Sept 21-24, 2026 Leipzig, Germany organized by: UFZ - Helmholtz Centre for Environmental Research Universität Leipzig

🌎 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).

Photo of Moritz Drupp and the text below: "Keynote Speaker: Prof. Dr. Moritz A. Drupp is Associate Professor for Sustainability Economics and Head of the Sustainability Economics Group at ETH Zurich, within the Department of Management, Technology and Economics. He is an internationally recognized environmental and sustainability economist whose work bridges theory, empirical research, and public policy to address the world's most pressing sustainability challenges."

Poster for the CBC 2026: Conference on Connecting Biodiversity, Climate and Human Behaviour Sept 21-24, 2026 Leipzig, Germany Organized by: UFZ - Helmholtz Centre for Environmental Research Universität Leipzig

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)

Photo of Isabel Martinez Cano and the text: "Keynote Speaker: Prof. Isabel Martinez Cano is an ecological scientist at the Spanish National Research Council (IMIB-CSIC). She works on ecological modelling and large-scale vegetation dynamics, with research contributions on topics such as the carbon cycle modelling in tropical forests, allometric relationships and plant functional traits, and the response of forest ecosystems to disturbances like fire.

Poster for the CBC 2026: Conference on Connecting Biodiversity, Climate and Human Behaviour Sept 21-24, 2026 Leipzig, Germany organized by: UFZ - Helmholtz Centre for Environmental Research Universität Leipzig

🌍 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

Global greenness in September. Shown is a globe depicting average global terrestrial greenness in September, visualized as “height over ground” and averaged over the period 2000–2023. Greenness is derived from satellite remote-sensing observations provided by NASA’s Moderate Resolution Imaging Spectroradiometer and illustrates the large-scale spatial distribution of vegetation activity across the terrestrial biosphere. CREDIT: Ida Flik

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!

Photo of Hans Verbeek with the text: "Keynote Speaker: Prof. Dr. Hans Verbeeck is Associate Professor in the Faculty of Bioscience Engineering, Department of Environment at Ghent University (Belgium). His work focuses on developing and applying process-based models of carbon, water, and energy fluxes in terrestrial ecosystems, with a particular focus on forest dynamics and their responses to environmental change.

Poster for the CBC 2026: Conference on Connecting Biodiversity, Climate and Human Behaviour Sept 21-24, 2026 Leipzig, Germany organized by: UFZ - Helmholtz Centre for Environmental Research Universität Leipzig

🌏 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/...

A photo of Prof. Liesje Mommer and the text below: "Keynote Speaker: Prof. Dr. Liesje Mommer is Professor of Belowground Ecology at Wageningen University & Research and a leading expert on plant-soil interactions and biodiversity. Her research focuses on how belowground processes - particularly root interactions, soil microbes, and pathogens - shape ecosystem functioning, productivity, and resilience.

Poster for the CBC 2026: Conference on Connecting Biodiversity, Climate and Human Behaviour Sept 21-24, 2026 Leipzig, Germany Organized by: UFZ - Helmholtz Centre for Environmental Research Universität Leipzig

🌎 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)

More Information on the call of abstract. They can also be found on the website.

Poster on CBC 2026 Conference on Connecting Biodiversity, Climate, and Human Behavior Sept 21-24, 2026 Leipzig, Germany Organized by: UFZ - Helmholtz Centre for Environmental Research Universität Leipzig

👇 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

Aerosol‐Cloud Interactions: Overcoming a Barrier to Projecting Near‐Term Climate Evolution and Risk Aerosol-cloud interactions (ACI) remain a barrier to provide precise and actionable advice to policy makers at global and regional levels We recommend improving satellite retrievals, expanding gr...

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....

Accelerated north–east shift of the global green wave trajectory | PNAS Viewed from space, a “green wave” seasonally traverses Earth’s surface, from the north in boreal summer to the south in austral summer. This wave r...

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

The greenness of the Earth’s terrestrial vegetation changes throughout the seasons. Researchers can calculate the global “green centre” and track its movement over several decades. They have observed a gradual shift towards the north-east. By Ida Flik. https://greenwave.earth/

🌍 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

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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

YouTube video by Simon Clark Speedrun the climate skeptic experience

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.

Excellent collaboration between institutes in Leipzig and Jena, @meteoleipzig.bsky.social @unileipzig.bsky.social @reichstein-bgc.bsky.social @anabastos.bsky.social @jkretzs.bsky.social

Hydroclimate shapes photosynthetic sensitivity to cloud cover across global terrestrial ecosystems Nature Communications - Clouds affect photosynthesis differently across hydroclimates: they enhance it in arid regions but reduce it in humid regions. With climate warming, changes in cloud cover...

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

Read Read chapter Front Matter: The scientific community has been studying the question of how human-caused emissions of greenhouse gases are affecting the cli...

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

Please let us also know in case European colleagues can do meaningful things to support!

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.

congratulations!

The Director of the German Climate Computing Centre (www.dkrz.de) is a joint appointment with University of Hamburg and leads the central facility for climate computing, being enlarged to also be a central climate data facility. A crucial thing for German climate science. Closing date: 17 Feb 2026

The director of @tropos-de.bsky.social is advertised as joint appointment as a full professor for Atmospheric Physics @meteoleipzig.bsky.social @unileipzig.bsky.social TROPOS is one of the large research centres in atmospheric sciences in Germany. Closing date: 31 March 2026

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”.