Wolfgang Cramer

@cramer-bondeau

#Climate & #biodiversity emeritus scientist, professor of global #ecology, #CNRS, MedECC, #IPCC, Acad. d'Agriculture de France. Occasional rail travel and bicycle geek. 🇩🇪 🇫🇷 🇬🇧 🇸🇪 🇳🇴

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Wolfgang Cramer@cramer-bondeau· 29d

Excess deaths during the recent and continuing European heatwave have been highest in France www.euromomo.eu/graphs-and-m...

screenshot from EuroMOMO website, taken July 13, 2026

Wolfgang Cramer@cramer-bondeau· Jul 12

...il est vraiment difficile de gérer ces systèmes de production d'électricité instables et intermittents... www.lemonde.fr/planete/live...

Wolfgang Cramer@cramer-bondeau· Jul 6

The hypocrisy is well illustrated by this paper www.tandfonline.com/doi/full/10.... which recognizes that more and heavier cars produce more and more toxic tyre wear particles, and then shows that the EU is not even close to their "zero pollution objective" and rather moves in the opposite direction

Wolfgang Cramer@cramer-bondeau· Jun 30

Just in case Europeans think that the air here is hotter than usual, do not forget that the sea surface of the entire planet is warmer than it has ever been in late June (since records began). pulse.climate.copernicus.eu

screenshot from copernicus, indicating 0.54°C temperature anomaly (relative to 1991-2020 average) on June 28, 2026

Wolfgang Cramer@cramer-bondeau· Jun 29

I have tried to address the root causes of the current heat wave, as well as ongoing adaptation efforts to such events, during my intervention with Al Jazeera on June 26, 2026 mediaview.aljazeera.com/video/LfXtWI...

screenshot from Al Jazeera News on June 26, 2026

Wolfgang Cramer@cramer-bondeau· Jun 25

A good conversation I had this week with Owen Jones from the UK, about the ongoing heatwave www.youtube.com/watch?v=ikvf... @owenjones.bsky.social

screenshot from the conversation with Owen Jones

Wolfgang Cramer@cramer-bondeau· Jun 15

Thank you Timothée, I think your commentary makes many excellent points, but I particularly want to emphasize this one: "What is considered ecologically sustainable from the sole perspective of climate change might not be when looked at from a multidimensional planetary boundary perspective."

There is a first general point worth making. The Global Justice Project functions with a single environmental constraint, having to do with greenhouse gases and global warming. The authors are perfectly aware of that, and they stress this very point in the conclusion of the report (pp. 128-129).[16] And yet, in terms of actual modelling, they don’t walk the talk. It’s always good to remember that carbon is only one colour of the Rubik’s cube. In addition to climate change, there are eight other planetary boundaries. What is considered ecologically sustainable from the sole perspective of climate change might not be when looked at from a multidimensional planetary boundary perspective. For example, from a climate-only lens, data centres are not particularly problematic if they run on low-carbon energies. And yet, they can be a problem if they require a lot of materials, artificialise land, consume large volumes of water, and degrade surrounding biodiversity. A scenario that decarbonises while quadrupling the size of the world economy may simply shift the pressure from one kind of overshoot to another, one that is perhaps not represented in the model.

Wolfgang Cramer@cramer-bondeau· Mar 23

Early-Bird registration: 2026 Conference Towards a just and habitable world: exploring the role of technology, Lausanne, Switzerland, 2–5 June 2026 pathways.futureearth.org/sustainabili...

conference web page illustration from Micha Huigen

Wolfgang Cramer@cramer-bondeau· Feb 11

The risk of a hothouse Earth trajectory www.cell.com/one-earth/fu... @williamripple.bsky.social

Tipping point threshold temperature estimates are shown with black dots; floating bars indicate lower and upper estimates. Note that the estimated tipping threshold of 1.2°C for low-latitude coral reefs has likely already been crossed.3 The dashed purple vertical line indicates 1.5°C above pre-industrial levels; a sustained global average temperature at this level is likely in the near future.2 Tipping point thresholds are adapted from Armstrong McKay et al.13 with updates from Lenton et al.3 Tipping impacts and timescales vary greatly. In some cases, effects on global temperatures may be uncertain or negligible (gray bars). Note that overlap can occur among feedbacks and/or tipping points, so their effects are not necessarily independent. See supplemental methods for further details, including data sources.

Wolfgang Cramer@cramer-bondeau· Jan 27

10 Lies Germans Were Told. 10 Lies You [US citizens] Are Being Told. This video from Melissa Dalton-Bradford is worth watching, for US citizens, Germans and everyone else on the planet. substack.com/@melissadalt... (thanks @alevermann.bsky.social for original share)

Wolfgang Cramer@cramer-bondeau· Jan 24

Clouds forming in the upper Drôme valley.

View from some place below the Col de Rousset

Wolfgang Cramer@cramer-bondeau· Jan 11

Just a view of Glandasse (Haut Diois, France) today.

Wolfgang Cramer@cramer-bondeau· Nov 23

Singing "Dies Irae" from Verdi's requiem, with Scientifiques en Rebellion @scientifiquesenrebellion.fr and the fantastic Orchestre de Nouveau Monde orchestredunouveaumonde.fr was a perfect way to take notion of government and private sector inaction during the 10 years since the Paris Agreement.

Wolfgang Cramer@cramer-bondeau· Nov 15

So someone at #SNCF seriously thinks that filling my screen with bullshit like this is going to help my journey tomorrow. How low can the appreciation for their own product (trains) go before it hits rock bottom?

Wolfgang Cramer@cramer-bondeau· Nov 12

New publication in Energy Research & Social Science (open access): The political ecology of oil and gas corporations: TotalEnergies and post-colonial exploitation to concentrate energy in industrial economies. www.sciencedirect.com/science/arti...

Wolfgang Cramer@cramer-bondeau· Nov 11

I recommended reading this book after having seen a near-final draft and I have now read it again. Fernando's account is a fantastic achievement and highly recommended reading for anyone who wants to understand why so many scientists now leave their labs and join the protests for a better future.

back cover of the book, with recommendations by several people

Wolfgang Cramer@cramer-bondeau· Oct 9

"1 million d’euros de la région AURA pour que 10 personnes aillent de Le Puy à Paris en avion…" mediascitoyens-diois.info/2025/10/1-mi...

Passagers reguliers du vol Le Puy - Paris

Wolfgang Cramer@cramer-bondeau· Oct 7

no further explanation needed

Foldable bicycle near the beach of the Baltic, Warnemünde, Germany

Wolfgang Cramer@cramer-bondeau· Sep 24

While we must all be concerned about the "Critically insufficient" rating of one country - we should not forget that the EU is currently rated, by the meticulous analysis of @climateactiontracker.org , as "insufficient" as well. Both policies and attitudes must change here as well.

screenshot from https://climateactiontracker.org/countries/eu/ on Sep 24, 2025

Wolfgang Cramer@cramer-bondeau· Sep 1

I think you completely misunderstand, Jon. SNCF is very friendly - just look at the e-mail I received here. They clearly want to resolve the real problems of my travel experience.

Wolfgang Cramer@cramer-bondeau· Aug 30

Récit en BD d'un projet contesté, qui séduit les industriels du fossile : répandre du soufre dans la stratosphère pour faire baisser la température. l.revue21.fr/9G Auteurs: @ysciama.bsky.social et Alban Marilleau

Page du BD "Les rêves fous d'un apprenti sorcier du climat"

Wolfgang Cramer@cramer-bondeau· Aug 22

Not that I was surprised to see the poor state of one of Germany's last glaciers today - but I did not know they were offering guided tours to it.

Schneeferner glacier, Zugspitze, Germany, Aug 22, 2025

Sign inviting guided walks to a dying glacier on the Zugspitze

Wolfgang Cramer@cramer-bondeau· Jul 22

Loi Duplomb : Clarification des faits scientifiques, parfaitement accessible à tout ceux qui souhaite savoir, par Philippe Grandcolas (CNRS) et Pierre-Michel Perinaud sur FranceInter : www.radiofrance.fr/franceinter/...

screenshot de la page web de France Inter

Wolfgang Cramer@cramer-bondeau· Jul 17

Ceci est une pétition d'une importance exceptionnelle pour la santé publique, l'environnement et même la démocratie. Je vous invite tous à la signer : "Non à la Loi Duplomb — Pour la santé, la sécurité, l’intelligence collective" >118000 dèjà petitions.assemblee-nationale.fr/initiatives/...

Wolfgang Cramer@cramer-bondeau· Jul 11

Some ecosystems face higher immediate risks from current warming than others, including virtually all coastal ecosystems, but also seagrass meadows, seaweeds and fish. 4/n

Risk assessment diagrams for open marine and coastal ecosystems in relation to observed and projected climate impacts on ecosystem structure, functioning and biodiversity. N is the total number of studies compiled, and n is the total number of studies taken into consideration in the bar.

Wolfgang Cramer@cramer-bondeau· Jul 11

Despite all efforts, there is an unavoidable bias in any such assessment, due to insufficient resources for monitoring and risk assessment in the South and East of the Med. Basin. 3/n

The geographic locations of the studies taken into consideration in the risk assessment (by country of the first author) and their study sites.

Wolfgang Cramer@cramer-bondeau· Jul 11

Our paper aims to cover all major coastal and open marine ecosystems in the Mediterranean Basin, as well as all major drivers of change. 2/n

Schematic illustration of (i) the different open marine and coastal ecosystems for which we assessed risk levels, and (ii) the main drivers taken into consideration in this assessment.

Wolfgang Cramer@cramer-bondeau· Jul 11

Just out: "Climate change risks on key open marine and coastal mediterranean ecosystems" rdcu.be/evGGx @jpgattuso.bsky.social www.medecc.org 1/n

title, authors and abstract of the paper

Climate change risks on key open marine and coastal mediterranean
ecosystems

Abed El Rahman Hassoun1, Meryem Mojtahid, Mohammad Merheb, Piero Lionello, Jean-Pierre Gattuso & Wolfgang Cramer
Mediterranean open marine and coastal ecosystems face multiple risks that impact their unique biodiversity, with climate change representing a major ongoing threat. While these ecosystems are also under pressure from non-climatic anthropogenic drivers (e.g., overfishing, pollution), this study primarily focuses on risks related to climate change. To assess these risks and evaluate their confidence levels, we adopt the scenario-based approach of the Intergovernmental Panel on Climate
Change (IPCC), relying on a review of literature projecting changes in Mediterranean Sea ecosystems.
The main drivers of environmental change are sea level rise, ocean warming and acidification. Similar to global conditions, all Mediterranean ecosystems face high risks under all climate scenarios, with coastal ecosystems being more strongly impacted than open marine ecosystems. For these coastal ecosystems, risk levels are expected to become very high already once global warming exceeds 0.8 °C with respect to the 1976–2005 period. A few Mediterranean ecosystems (e.g., coralligenous and rocky coasts) are relatively more resilient compared to others, probably because of their long evolutionary history and the presence of a variety of climatic and hydrological conditions. However, high-emission scenarios in specific sub-basins, in addition to acidification impacts, could reduce this resilience, decreasing both habitat extent and ecosystem function dramatically. Overall, due to the higher observed and projected rates of climate change in the Mediterranean, compared to global trends, for
variables such as seawater temperature and pH, marine ecosystems (particularly coastal) are projected to be under higher risks compared to the global ocean.

Wolfgang Cramer@cramer-bondeau· Jul 11

Yes, Roger, but the near-term risk is everywhere:

Figure from Technical Summary of IPCC AR6 WG2 showing human vulnerability around the globe

Wolfgang Cramer@cramer-bondeau· Jun 29

Même pas une goutte de pluie ici depuis trois semaines, et ça ne semble pas près de changer. www.romma.fr/station_clim... Mais le gouvernement est surtout préoccupé par l'accès illimité aux pesticides cancérigènes.