Author | Lightnews

Gaël Mariani @gaelmariani.bsky.social · 1d

Many thanks to all co-authors for their huge contribution to this work! 🎉😀🙌
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Gaël Mariani @gaelmariani.bsky.social · 1d

Although measures restoring commercial fish biomass could yield carbon benefits comparable to mangrove restoration 🌳, significant knowledge gaps and uncertainties remain and prevent their inclusion in the nature-based climate solution portfolio! ❌⛔
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Gaël Mariani @gaelmariani.bsky.social · 1d

❓ This leads to the following question: Can the restoration of fish populations promote carbon export and sequestration to mitigate climate change 📈?
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Gaël Mariani @gaelmariani.bsky.social · 1d

🎣🌡️🌍 Combined with climate change (under SSP 5-8.5), maintaining today's fishing levels will further decrease commercial fish carbon export by 56.7% compared to the 1950s 📉.
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Gaël Mariani @gaelmariani.bsky.social · 1d

🎣 Fishing has already reduced commercial fish carbon export by 47% compared to the 1950s. Every 1% decline in biomass due to fishing will decrease fish carbon export by 0.8%! Again, size matters as size-related (📏) mechanisms linked to fish metabolism are at work!
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Gaël Mariani @gaelmariani.bsky.social · 1d

With every degree of warming, commercial fish biomass and carbon export will decrease by 4.2% and 2.5%, respectively. This shows that mechanisms related to fish size (📏) and temperature (🌡️) are at work, partly offsetting the direct impact of a decrease in biomass ⚖️!
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Gaël Mariani @gaelmariani.bsky.social · 1d

🌡️🌍 Climate change is projected to decrease fish carbon export by 4% under SSP 1–2.6, and 13.5% under SSP 5-8.5 by 2100, relative to the 1990s 📉.
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Gaël Mariani @gaelmariani.bsky.social · 1d

We show that in 1950, before the development of industrial fisheries, commercial fish exported 0.23GtC.yr, mostly through the sinking of their fecal pellets 💩, but also through the sinking of their dead carcasses 💀.
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Gaël Mariani @gaelmariani.bsky.social · 1d

🚨🎉 Check out our new paper assessing the impacts of fishing (🎣) and climate change (🌡️) on carbon export and sequestration by commercial fish! 🐟
🔗 rdcu.be/eMTU6
🔽 Here are some key results! 🔽

@oceanicu.bsky.social
@natcomms.nature.com
🌐🦑🦈🌊

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Reposted by Gaël Mariani

Ian Hall @ianhall.bsky.social · 2d

🌊✊ Solidarity with Leonid Pshenichnov — the Ukrainian biologist arrested for backing curbs on Antarctic krill fishing. Protecting ecosystems isn’t treason. It’s good science, and it’s our future.

www.theguardian.com/environment/...

Russia arrests Ukrainian biologist for backing curbs on Antarctic krill fishing

‘Trumped-up’ charges spark diplomatic row as scientists express fears for health of 70-year-old Leonid Pshenichnov

www.theguardian.com

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Reposted by Gaël Mariani

David Ho @davidho.bsky.social · 1d

Some of the climate benefits of forestry and revegetation projects are erased by the fact that they reduce the reflectivity of Earth's surface. 🧪

Accounting for albedo in carbon market protocols - Nature Communications

The paper analyzes the impact of omitting biophysical effects from carbon credits on climate mitigation. It shows that some Voluntary Carbon Market projects may result in net warming due to albedo whi...

www.nature.com

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Reposted by Gaël Mariani

Bon Pote @bonpote.com · 8d

Le nouveau projet Bon Pote est en ligne : la Graphothèque ! Une base de données visuelles pour mieux appréhender les enjeux écologiques.

L’objectif est simple : vous avez besoin d’un chiffre sur l’écologie, il est (ou sera !) sur Bon Pote. Tout est disponible ici : bonpote.com/data/

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Reposted by Gaël Mariani

Patrick Marques @pmarques35.bsky.social · 12d

[1/3] PHOTO - Le concours Wildlife Photographer of the Year (Natural History Museum) distingue chaque année des clichés révélant la beauté et la fragilité du vivant. En 2025, les images primées traduisent la tension entre biodiversité menacée et adaptation des milieux. #geography #photography

Wildlife Photographer of the Year awards – in pictures

The Wildlife Photographer of the Year is an annual competition hosted by the Natural History Museum in London, which awards top honours in various categories for outstanding photography

www.theguardian.com

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Reposted by Gaël Mariani

David Shiffman, Ph.D. 🦈 @whysharksmatter.bsky.social · 15d

What the WTO’s deal to curb fisheries subsidies means and what it could achieve theconversation.com/what-the-wto...

What the WTO’s deal to curb fisheries subsidies means and what it could achieve

For decades, government subsidies have helped industrial fishing fleets to expand, often with little regard for sustainability.

theconversation.com

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Reposted by Gaël Mariani

Royal Society Publishing @royalsocietypublishing.org · 15d

#BiologyLetters Antarctic krill, small marine animals, have a key role in the ocean’s food web and carbon cycle. A study of their feeding behaviour raises concerns about the impact of pollution on krill and carbon cycling in the ocean. Read more: royalsocietypublishing.org/doi/10.1098/... #behaviour

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Reposted by Gaël Mariani

Ian Hall @ianhall.bsky.social · 21d

🌊 Marine heatwaves modulate food webs and carbon transport processes

In 2015 & 2019, POC ⬆️ in the NE Pacific, but instead of sinking, tiny particles lingered mid-depth, cutting carbon sequestration

Ecosystem responses vary, and long-term ocean monitoring is crucial

www.nature.com/articles/s41...

Marine heatwaves modulate food webs and carbon transport processes - Nature Communications

A decade of BGC-Argo and plankton records shows North Pacific heatwaves reshape food webs and trap small particles in midwater, slowing deep-ocean carbon export. Impacts vary by event, underscoring the need for sustained ocean monitoring.

www.nature.com

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Reposted by Gaël Mariani

Science Magazine @science.org · Jul 24

Marine protected areas can protect fish and maintain healthy ecosystems. As demonstrated by two related papers in this issue, however, such areas are only effective against illegal fishing when established limitations are enforced.

Learn more this week in Science: scim.ag/3H6oeXQ

The Galapagos Islands, where a sea lion hunts salema fish

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Reposted by Gaël Mariani

The Conversation France @france.theconversation.com · Jul 24

La majorité de la pêche industrielle dans les aires marines protégées échappe à toute surveillance

La majorité des aires marines protégées dans le monde n’offre que peu de protection face à la pêche industrielle, qui échappe souvent à toute surveillance publique.

theconversation.com

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Gaël Mariani @gaelmariani.bsky.social · Jul 18

@envdefensefund.bsky.social

Gaël Mariani @gaelmariani.bsky.social · Jul 18

🔑 Second key message: Although there is still a lot we don’t know about the twilight zone 🌘, current research supports a precautionary approach before establishing new fisheries in the mesopelagic zone 🛡️.
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Gaël Mariani @gaelmariani.bsky.social · Jul 18

🔑 First key message: Many ocean-based natural climate solutions have been proposed, but they vary in readiness for deployment. We still have so much to learn before we can deploy them in the ocean.
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Gaël Mariani @gaelmariani.bsky.social · Jul 18

📚 New paper alert! 📚 We know the ocean is a powerhouse for carbon sequestration, absorbing over 30% of the carbon emitted into the atmosphere! But what exactly do we know about the role fish🐟 and marine mammals 🐳 play in carbon sequestration? Find out more: doi.org/10.1029/2024...
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Reposted by Gaël Mariani

Christophe Cassou @cassouman40.bsky.social · Jul 16

1 mn pour signer ...
1 chance pour revenir sur cette loi, véritable rupture démocratique pour conjurer cynisme&irresponsabilité.
Chaque signature compte!
A toutes et tous!
C'est ici 👇 et vivent les rebsweets!
petitions.assemblee-nationale.fr/initiatives/...

Non à la Loi Duplomb — Pour la santé, la sécurité, l’intelligence collective. - Non à la Loi Duplomb — Pour la santé, la sécurité, l’intelligence collective. - Plateforme des pétitions de l’Assemblée ...

Je m'appelle Eléonore PATTERY, j’ai 23 ans, et je suis actuellement en Master QSE et RSE (Qualité, Sécurité, Environnement / Responsabilité Sociétale des Entreprises). En tant que future professionne...

petitions.assemblee-nationale.fr

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Reposted by Gaël Mariani

Joeri Rogelj @joerirogelj.bsky.social · Jul 14

New research on limits to CO2 removal (CDR). CDR is key to our ambition to stop adding climate pollution to the atmosphere. Because it's uncertain how much will be delivered and it clearly comes with risks of social & environmental side-effects, legal issues arise. This paper provides an overview. 👇

Rupert Stuart-Smith @rupertstuartsmith.bsky.social · Jul 14

🚨 Out now in @climate-policy.bsky.social: New research with @thomwetzer.bsky.social @rubenpruetz.bsky.social @joerirogelj.bsky.social Lavanya Rajamani, Marianne Wood and Ewan White: States are depending heavily on CO2 removal to meet climate targets, risking the Paris Agreement goal.

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Reposted by Gaël Mariani

Valérie Masson-Delmotte @valmasdel.bsky.social · Jul 11

Poor integrity of carbon offsets :

"all key market participants benefit from inflated claims about carbon credits"

www.science.org/doi/10.1126/...

Auditors can’t save carbon offsets

The theory behind carbon offset projects is appealing: Instead of an organization cutting its own emissions, it can fund lower-cost carbon-reducing projects elsewhere to “offset” its emissions. The re...

www.science.org

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