Tourist visits to Madagascar help conserve some forests, but others suffer: study suggests what to do

Source: The Conversation – Global Perspectives – By Ranaivo Rasolofoson, Assistant Professor, School of the Environment, University of Toronto

Madagascar is one of the world’s biodiversity hotspots. The island country is well known for its diverse and endangered range of wildlife. This includes over 100 species of lemurs and six species of majestic baobab trees found nowhere else.

The country is also among the world’s poorest. About 80% of its population live below the international poverty line of US$2.15 a day.

Attracting tourist visits to protected areas, such as Analamazaotra-Mantadia National Park, has long been one of Madagascar’s policy priorities. The aim is to channel tourist income towards conserving these areas. Tourist revenue is also supposed to reduce poverty through foreign currency revenue, job creation, and infrastructure development.




Read more:
Madagascar’s ancient baobab forests are being restored by communities – with a little help from AI


Globally, tourism is a powerful way of generating income. In 2024, travel and tourism represented 10% of the global economy (US$10.9 trillion). In Madagascar, tourism revenue makes up nearly 16.6% of the country’s economy.

We are a group of socio-environmental researchers who investigated the effects of tourist visits on the forests of 40 protected areas across Madagascar. The country’s natural forests shelter its rich, unique and endangered terrestrial biodiversity. An estimated 88% of Madagascar’s biodiversity is dependent on forests. But after decades of high deforestation rates, only 10%-15% of Madagascar’s land is still covered with natural forests.

For our research, we used 20 years of satellite data to study changes in the forests. We combined this with tourism visit counts from each protected area.

We ran statistical tests to see whether tourist numbers had any effect on deforestation in and outside protected areas. We also took into account other factors that could influence forest loss and tourism, like rainfall and population growth.

Before our study, no research had measured across the whole country how tourism in protected areas affects deforestation.




Read more:
Climate change is threatening Madagascar’s famous forests – our study shows how serious it is


Madagascar’s protected areas have a three kilometre buffer around them. Our research found that increased tourist visitors have not reduced forests within the protected areas, but have resulted in deforestation in the buffer zones.

There could be two reasons for this. Firstly, some agricultural and pastoral activities, fishing, and other types of activities are allowed within the buffer zone forest. Local people who used to harvest wood or clear forest for agricultural land from the protected area could be shifting this activity to the buffer zone outside. (Firewood and charcoal remain the primary energy source for most communities in Madagascar.)




Read more:
Forest conservation approaches must recognise the rights of local people


Secondly, villages outside protected areas might be clearing forests to accommodate tourists and tourism workers. Maps of forest cover showed that when tourism increased, deforestation increased in the buffer zones and near the entrances to the protected areas (where hotels and restaurants are set up).

We therefore recommend that buffer zones of protected areas be prioritised in Madagascar’s national reforestation programme.

Tourism only shifts deforestation

Madagascar currently has 127 protected areas – about 10% of the country’s land area. The majority were established after the 2003 International Union for Conservation of Nature World Parks Congress. There, the government of Madagascar pledged to increase its protected areas to 10% of the country’s land area.

Major threats to protected areas include land clearing for agriculture, mining, illegal logging, and production of firewood and charcoal. Our study focused on 40 protected areas established before 2003 and managed by Madagascar National Parks. This is because these are the only protected areas for which annual visitor numbers are available.




Read more:
The loss of Madagascar’s unique palm trees will devastate ecosystems


In protected areas, a portion of tourist entrance fees are shared with local communities. But it is difficult to know if this is enough money for communities to pay for their needs instead of relying on the forest. Tourist fee income is also not necessarily distributed to people most reliant on forest extraction.

Shifting deforestation to the buffer zone of protected areas is not necessarily a negative outcome for conservation, because it still leaves the protected area intact. Forests within buffer zones are also often intended to support local livelihoods. They are sometimes even of lower conservation value (less biodiverse) than protected forests.




Read more:
What Cameroon can teach others about managing community forests


However, increased deforestation there must be considered in conservation planning. This is because if the buffer area forests are gone, local people may enter the protected area to extract resources. This would endanger biodiversity and the critical ecological services they provide to local people.

What needs to happen next

Madagascar has a national reforestation programme. The country should also restore the forest in the buffer zone areas so that local communities’ needs for forest products can still be met.

We recommend that sustainable management of buffer zone forests include:

  • reforestation

  • planning where and when specific activities like wood extraction and farming can be done

  • sustainable agricultural practices and regenerative agriculture

  • promotion of alternative livelihoods

  • developing and enforcing environmental sustainability regulations for hotels and restaurants.

Strategies to protect buffer zone forests must include local communities in the designing, planning, setting up and monitoring stages. The aim should be to make sure that the plans are suitable for the local area, that they empower local people and that they’ll be sustainable for the future.




Read more:
Burkina Faso’s nature reserves are worth protecting – but people have to be part of the plan


Tourism entrance fees should continue to be shared between protected areas. This will support the operating costs of protected areas with few tourists.

If Madagascar wants to keep the forests in its protected areas, it must sustainably manage forests in buffer areas to provide for local communities’ needs.

The Conversation

Camille DeSisto has received funding from Duke University, Rice University, Phipps Conservatory, Explorers Club, Primate Conservation Inc., P.E.O. Foundation, and Garden Club of America.

Tristan Frappier-Brinton has received funding from Duke University, Re:wild, Primate Conservation Inc, and the National Science Foundation.

Ranaivo Rasolofoson does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Tourist visits to Madagascar help conserve some forests, but others suffer: study suggests what to do – https://theconversation.com/tourist-visits-to-madagascar-help-conserve-some-forests-but-others-suffer-study-suggests-what-to-do-275824

Going nuclear? Why a growing number of Washington’s allies are eyeing an alternative to US umbrella

Source: The Conversation – Global Perspectives – By Amy McAuliffe, Visiting Distinguished Professor of the Practice, University of Notre Dame

American allies contemplate a post-U.S. nuclear umbrella future. AP Photo/Alex Brandon

Canadians are openly discussing the merits and risks of pursuing a nuclear weapon. Europeans are similarly considering a nuclear deterrent for the bloc. In South Korea, public support for a nuclear weapon is at its highest level on record, and even in Japan some politicians are talking about the once-taboo subject.

Until just a few years ago, few experts would have predicted that these nations – all allies of Washington – might one day join the nuclear club. Since 2006, that club has consisted of just nine countries: the United States, Russia, the United Kingdom, France, China, India, Pakistan, North Korea and Israel, with its undeclared program.

The hope of nonproliferation advocates was that nine would be the maximum. But over the past few years, more and more nations are seriously exploring “going nuclear.”

As an expert on weapons technology and former assistant director of the CIA for weapons and counterproliferation, I have watched these developments with alarm.

Perceived national security threats still shape U.S. allies’ views of developing nuclear weapons – with North Korea a key driver for South Korea, China paramount for Japan, and Iran key for Saudi Arabia.

But what has changed demonstrably for many U.S. allies is a newfound skepticism over the credibility of the so-called U.S. nuclear umbrella, which for decades has offered allies an easy way of declining to pursue nuclear weapons. Concerned about the Trump administration’s foreign policy, some nations are considering developing domestic nuclear weapons programs or seeking new deterrence assurances.

New nuclear aspirants across the Atlantic

The U.S. deployed the first atomic bombs in Japan in 1945, with the Soviet Union conducting its own successful nuclear test four years later. The U.K. was next to get the bomb in 1952, followed by France in 1960 and China in 1964. Experts believe that Israel first tested a bomb in the late 1960s, while the last entrants into the nuclear club were India in 1972, Pakistan in 1998 and North Korea in 2006.

Experts have long wondered which country might be next. Often, speculation has included U.S. allies such as Egypt, Japan, Saudi Arabia, South Korea and Turkey.

For years, such nations were assumed to be under the U.S. nuclear umbrella, a tacit understanding that Washington will defend its nonnuclear allies, including by using U.S. nuclear weapons. Doubts about the credibility of the U.S. nuclear umbrella have existed for years and precede the Trump administration. However, current U.S. officials’ criticisms of NATO, focus on burden sharing, and policy positions on Ukraine have brought into stark relief for allies the need to consider other nuclear options. And with allies now focused on the limits of U.S. security guarantees, the list of possible nuclear aspirants has suddenly grown.

European leaders have crafted their public comments on the issue carefully, focusing on concerns about U.S. reliability in general versus the credibility of the U.S. nuclear umbrella.

A suited man gives a speech at a lectern in front of a submarine.
French President Emmanuel Macron delivers a speech at a French nuclear submarine base in Crozon, France, on March 2, 2026.
Yoan Valat/Pool Photo via AP

Rasmus Jarlov, the chair of the Danish parliament’s defense committee, perhaps best reflected the views of many U.S allies in Europe, telling The Associated Press: “If things got really serious, I very much doubt that Trump would risk American cities to protect European cities. We don’t know, but it seems very risky to rely on the American protection.”

In Europe, most public discussion has focused on the concept of a common nuclear deterrent for the bloc under the protection of French nuclear forces. In a major speech in March, French President Emmanuel Macron called for “forward deterrence” involving the temporary deployment of French nuclear-armed aircraft to nine other European countries, including Germany and Poland.

Meanwhile, the Swedish prime minister has had talks with Britain and France about deploying the two countries’ nuclear forces to Sweden during wartime.

But the French pledge does not extend a guarantee to defend allies with French nuclear weapons. Instead, France will use nuclear deterrence to defend French “vital interests,” a purposefully vague phrase. Only time will tell whether Macron’s offer will satisfy European partners – or prevent them from deciding to take matters into their own hands.

There has been growing speculation over whether Poland and Germany might be considering developing their own nuclear weapons. While German Chancellor Friedrich Merz has explicitly ruled it out, Polish leaders’ comments leave the option open.

In early March, Polish Prime Minister Donald Tusk told the Polish parliament that Poland “must reach for the most modern solutions related to nuclear weapons,” seeming to reflect personal support for Warsaw’s long-term pursuit of a weapon and near-term conversations with the French about a nuclear umbrella.

In Canada, meanwhile, the former chief of the country’s defense staff said in February that Canada should not rule out acquiring nuclear weapons. While the comments drew opposition from the current Canadian defense minister, the discussion of whether Canada would consider “going nuclear” did not seem out of line in today’s global security environment.

Heightened discussions in Asia

Similar discussions among current and former government officials have been percolating across Asia.

For Japan, such talks mark a significant development. Article 9 of the Japanese Constitution, largely drafted by U.S. occupation authorities after World War II, renounces war. And in 1967 Japan further pledged not to produce, possess or host nuclear weapons in its territory — the “Three Non-Nuclear Principles.”

A city lies in ruins after a nuclear bomb detonation.
A pall of smoke lingers over a scene of nuclear destruction in Hiroshima, Japan, on Aug. 7, 1945.
AP Photo

But the issue is no longer taboo. In late 2025, an unnamed official in the new administration of Prime Minister Sanae Takaichi expressed his personal opinion that Japan should begin discussions about developing nuclear weapons.

These remarks drew an official rebuke from Takaichi. Moreover, Japanese nuclear weapons are unlikely to be in the cards anytime soon, particularly given the sensitivity surrounding Japan’s status as the only nation to directly experience the consequences of nuclear weapons. Nonetheless, Takaichi’s ruling Liberal Democratic Party is reconsidering its position on Tokyo’s nonnuclear principles to discuss allowing U.S. nuclear weapons to enter Japanese territory.

South Korea is a different story. Last year, the foreign minister in the former conservative Yoon administration argued that an independent nuclear deterrent for Seoul “was not off the table,” given the unpredictability of the Trump administration. Left unsaid, but clearly in the background, were concerns about the U.S. nuclear umbrella.

South Korea’s previous nuclear weapons program and public support for reviving it could make a future South Korean nuclear weapon a real possibility, even though the current center-left administration stresses Seoul’s nonnuclear stance.

Yet the public mood has also shifted. A total of 76% of respondents now support an indigenous nuclear weapon, according to a March 2025 poll by the Asian Institute for Policy Studies. That was an increase of 5 percentage points since 2024 and the highest level of public support for Seoul pursuing a nuclear weapons capability since the poll originated in 2010.

Saudi Arabia’s focus on the fuel cycle

In the Middle East, the Washington ally most likely to pursue a nuclear weapon remains Saudi Arabia. In Sept. 2023, de facto ruler Crown Prince Mohammed bin Salman reiterated his public stance that Riyadh would acquire a nuclear weapon if Iran did.

Perhaps more likely is Ryadh’s pursuit of a “latent” nuclear weapons capability, meaning that Saudi Arabia would develop relevant technology and expertise to be able to produce a weapon quickly if it made the political decision to do so. An indigenous capability to enrich uranium would be key.

Two political leaders stand side by side in a photo op.
President Donald Trump stands with Saudi Arabia’s Crown Prince Mohammed bin Salman on his visit to the White House on Nov. 18, 2025.
AP Photo/Mark Schiefelbein, File

Indeed, the crown prince has demonstrated an enduring interest in developing a Saudi nuclear fuel cycle. He continues to pursue domestic uranium enrichment, regardless of the state of Iran’s nuclear program.

In November 2025, members of the U.S. Congress wrote a letter to Secretary of State Marco Rubio expressing concern that “the administration has revived talks with Saudi Arabia to give it access to U.S. technology and to potentially allow it to enrich uranium.”

The willingness of the Biden and Trump administrations to pursue nuclear deals for civilian power reactors with allies that permit uranium enrichment could assist Saudi Arabia and South Korea in pursuing nuclear weapons. The “gold standard” U.S. nuclear cooperation agreement, called a 123 agreement, prohibits enrichment and reprocessing.

In September 2025, the Pakistani defense minister announced that Pakistan would extend its nuclear umbrella to Saudi Arabia, if needed, perhaps reducing Riyadh’s focus on obtaining formal U.S. security assurances. If genuine, this commitment provides Prince Mohammed the time and protection to develop Saudi nuclear weapons or a latent nuclear capability.

All of these developments suggest that despite decades of nonproliferation experts warning about the expansion of the nuclear club, new entrants are a very real possibility for the first time in decades.

The Conversation

The article solely reflects the views of the author and not those of the United States Government.

ref. Going nuclear? Why a growing number of Washington’s allies are eyeing an alternative to US umbrella – https://theconversation.com/going-nuclear-why-a-growing-number-of-washingtons-allies-are-eyeing-an-alternative-to-us-umbrella-275389

Pêche récréative et pollution plastique : créer des leurres souples qui disparaissent vraiment

Source: The Conversation – France in French (2) – By Erwan Vasseur, Doctorant en Sciences et technologie industrielles, Université Bretagne Sud (UBS)

Des millions de leurres finissent dans la nature chaque année en France. Verlin Auliane / Unsplash, CC BY-SA

Chaque année, des millions de pêcheurs perdent (sans le vouloir) une partie de leur matériel dans l’eau. Parmi les objets les plus souvent « abandonnés » : les leurres souples, petits bouts de plastique très efficaces… mais très persistants.


Mon travail de thèse, mené en collaboration avec l’entreprise FiiiSH, a consisté à développer des formulations à base de PHA capables de réduire la persistance des leurres souples dans l’environnement. La solution la plus prometteuse identifiée à ce jour n’est pas encore assez souple pour un usage pleinement satisfaisant, mais elle montre déjà de forts signes de biodégradation et de non-toxicité. Il reste donc du travail pour atteindre le bon compromis mécanique, mais la piste est sérieuse.

Une pratique massive et des pertes invisibles

Illustration de la pollution des leurres souples
Illustration de la pollution des leurres souples.
Fourni par l’auteur

La pêche de loisir est un loisir très répandu en France, en mer comme en eau douce. Les estimations institutionnelles évoquent environ 3,8 millions de pratiquants en mer en 2024, et plusieurs millions de cartes de pêche sont délivrées chaque année en eau douce. À cette échelle, même si la grande majorité des pêcheurs adopte de bonnes pratiques, une part de pertes reste inévitable : accrochage sur roches, branches, épaves, casse de ligne, courant, houle… À force de répétitions, un « petit » objet perdu involontairement devient un flux collectif.

Illustration de la souplesse d’un leurre souple.
Black Minnow FIIISH, Fourni par l’auteur

Un leurre souple doit « vivre » dans l’eau. Sa nage dépend de sa forme, mais aussi de sa viscoélasticité : trop rigide, il nage mal ; trop mou, il se déchire ; instable, il durcit ou devient poisseux avec le temps. En bref, le matériau doit être à la fois flexible, résistant, stable au stockage et transformable industriellement. C’est un cahier des charges très strict et complexe pour un matériau.

La pollution liée à la pêche est multiple : emballages, fils, plombs, mais aussi fragments de leurres. Un leurre souple ne pèse que quelques grammes : pris isolément, l’impact paraît négligeable. Mais dans des zones très fréquentées (digues, estuaires, embouchures, postes en rivière…), les pertes se concentrent et s’additionnent. On estime qu’un pêcheur perd en moyenne 10 leurres par an, pour environ 15 g par leurre, ce qui donne un ordre de grandeur de cette pollution plastique. Ces chiffres restent toutefois à prendre avec précaution, car ils sont difficiles à mesurer précisément. Avec le temps, les plastiques conventionnels peuvent s’abîmer sous l’effet des UV, de l’abrasion et des contraintes mécaniques, et générer des fragments plus petits : les microplastiques. Dans certains cas, des composés peuvent aussi migrer depuis l’objet en plastique vers l’eau. L’enjeu n’est donc pas seulement esthétique : il touche à la persistance des débris et à leur interaction avec les écosystèmes.

Les PHA : des plastiques produits par des bactéries

Les polyhydroxyalcanoates (PHA) sont une famille de polyesters que certaines bactéries fabriquent naturellement comme réserve de carbone et d’énergie. Industriellement, on retrouve une logique de fermentation : on nourrit des microorganismes avec une source de carbone (par exemple, sucres, huiles), on pilote les conditions pour favoriser l’accumulation de PHA dans les cellules, puis on récupère la biomasse et on extrait/purifie le polymère. On obtient alors une « résine » utilisable en plasturgie, sous forme de granulés. Les PHA sont donc bien des plastiques à part entière. En revanche, dans leur état initial, leurs propriétés sont souvent trop rigides pour des applications comme les leurres souples de pêche, ce qui impose d’ajouter des additifs, notamment des plastifiants, afin d’assouplir la matière.

L’intérêt des PHA est double. D’une part, ils peuvent être biosourcés (selon le procédé et les substrats). D’autre part, leur structure de polyester est favorable à la biodégradation dans certains milieux. Mais ce « peut être biodégradable » est important : tout dépend des conditions et de la formulation finale.

Un plastique biodégradable ne disparaît pas comme un comprimé effervescent. Il ne fond pas au contact de l’eau. La biodégradation est un processus biologique : des microorganismes, via des enzymes, transforment progressivement le matériau en produits simples (CO2, eau, sels minéraux et biomasse en conditions aérobies).

La clé, c’est la conversion finale : un matériau qui ne fait que se fragmenter plus vite peut produire des microplastiques sans réellement être biodégradé. Autre point essentiel : « biodégradable » n’est pas synonyme de « biosourcé ». Un matériau peut être biosourcé sans être biodégradable, et l’inverse. Pour éviter le greenwashing, il faut toujours préciser le milieu (sol, compost, eau douce, mer), la méthode de mesure et l’ordre de grandeur du temps de l’essai dans lequel l’échantillon se dégrade.

Comment transformer un PHA en leurre ?

Le défi est d’obtenir une matière suffisamment souple. Beaucoup de PHA sont naturellement plutôt rigides. Pour approcher la sensation d’un leurre conventionnel, on peut jouer sur la chimie du copolymère, mais aussi sur la formulation : plastifiants compatibles, mélanges, ou architectures internes qui stabilisent la souplesse.

C’est ici que mon travail de recherche s’inscrit, dans le cadre d’une collaboration avec l’entreprise FiiiSH : développer des formulations PHA adaptées à la pêche au leurre souple, en intégrant dès le départ les contraintes industrielles (mise en forme, reproductibilité, stabilité au stockage) et les exigences environnementales. Aujourd’hui, ces travaux ont déjà permis d’identifier plusieurs formulations prometteuses et de les évaluer à l’échelle laboratoire à travers des essais de caractérisation thermique, mécanique et rhéologique (la rhéologie est l’étude de la déformation et de l’écoulement de la matière sous l’effet d’une contrainte appliquée). L’enjeu est désormais de confirmer leur robustesse, leur stabilité dans le temps et leur pertinence pour un usage réaliste en leurre souple.

Différence de souplesse entre la matière actuellement utilisée (a) et la matière finale formulée à partir de PHA (b).
Fourni par l’auteur

Même avec un PHA prometteur, tout se joue souvent dans sa plastification. Obtenir un matériau souple ne suffit pas : il faut une souplesse stable et une bonne tenue mécanique. Or la compatibilité entre un PHA et un plastifiant est délicate : un plastifiant non miscible peut provoquer des hétérogénéités qui induisent une déchirure plus facile et une tenue mécanique qui chute. À l’inverse, un plastifiant trop compatible avec la résine peut « trop bien » s’y intégrer : il assouplit tellement le polymère qu’il relâche une partie du réseau d’enchevêtrements, et on obtient alors un matériau certes mou, mais très sensible à la déchirure. Pour se représenter la structure d’un plastique, on peut imaginer un plat de spaghettis bien emmêlés : les « nœuds » formés par les fils de pâte correspondent aux enchevêtrements, ces points d’accroche qui donnent au matériau sa cohésion.

Un petit objet mais une grande preuve à apporter

Rendre un leurre souple biodégradable ne consiste pas à « changer de plastique » dans une fiche technique. C’est un compromis délicat entre performance, stabilité et preuve environnementale. Les PHA offrent une piste crédible, à condition de rester rigoureux sur les mots (« biodégradable » n’est ni « soluble » ni « effervescent ») et sur les mesures. La suite se joue autant en laboratoire qu’en industrie : formulation, mise à l’échelle, transparence sur les compositions et validation dans des scénarios réalistes.

Si cette transition réussit sur un objet aussi exigeant qu’un leurre souple, elle pourrait inspirer d’autres produits exposés à la nature, où l’on ne peut pas éliminer totalement les pertes mais où l’on peut réduire, concrètement, la persistance.

À ce stade, un premier prototype de leurre a déjà vu le jour. Il reste désormais à l’éprouver en conditions réelles de pêche pour juger de sa performance sur le terrain. La solution n’est pas encore totalement aboutie, notamment parce qu’elle doit encore gagner en souplesse, mais elle n’est plus seulement une idée de laboratoire : elle commence déjà à prendre la forme d’un leurre.

The Conversation

Erwan Vasseur a reçu des financements de l’entreprise Fiiish et IRDL (Institut de Recherche Dupuy De Lôme).

ref. Pêche récréative et pollution plastique : créer des leurres souples qui disparaissent vraiment – https://theconversation.com/peche-recreative-et-pollution-plastique-creer-des-leurres-souples-qui-disparaissent-vraiment-277774

Beavers can turn streams into carbon stores – we measured how much

Source: The Conversation – UK – By Joshua Larsen, Associate Professor in Water Science, University of Birmingham

WildMedia/Shutterstock

Across Europe, beaver numbers are increasing after a long period of decline. As these aquatic mammals recolonise rivers, they are gradually rebuilding wetlands that once existed across many river valleys.

As geographers, we have been investigating how these changes could also affect the movement of carbon through river systems.

To find out, we measured the full carbon balance of a wetland created by beaver damming. Our new study shows that a wetland created by beaver damming can store carbon at rates up to ten times higher than an equivalent stretch of river and floodplain without beavers.

Over just 13 years, the wetland we studied in northern Switzerland locked away more than 1,100 tonnes of carbon. That’s comparable to two Olympic swimming pools filled with charcoal.

So when beavers dam rivers, they can also fundamentally change how carbon is stored in river landscapes.

Our team studied a wetland where beavers have been active for more than a decade.

We monitored the site intensively for a full year to measure the flow of water, the amount of carbon dissolved in the water, released greenhouse gases (such as carbon dioxide and methane) and plant growth across the wetland. We also sampled and analysed sediments and dead wood that had accumulated since the beavers arrived.

By combining these measurements, we have built one of the most complete carbon budgets for a beaver landscape in Europe.

The results surprised us.

Despite some seasonal carbon emissions during summer, the wetland acted as a strong carbon sink. Each year it stored around 98 tonnes of carbon that would otherwise have flowed downstream or returned into the atmosphere.

But this annual carbon balance is strongly linked to water flow and the extent of flooding, which can vary year-to-year. What really determines long-term benefits is how much carbon ultimately becomes buried and stored in the landscape for decades.

drone shot of woodland with river running through
Researchers studied a beaver wetland in Switzerland.
Christof Angst, CC BY-NC-ND

When a dam slows the water, sediments begin to settle. These sediments carry organic material such as leaves, soil and plant fragments that contain carbon. Instead of washing away downstream, the material becomes buried in wetland soils.

Beaver dams also raise water levels and can flood existing vegetation. Some trees die and fall into the water, adding large amounts of dead wood that slowly stores carbon over long periods.

Meanwhile, a new succession of wetland plants and algae growing in the wetland absorb carbon from the atmosphere.

Over time, the wetland becomes a natural storage system. Sediment, wood and vegetation build up layer by layer. This locks carbon into the landscape and eventually fills the wetland.

In the wetland we studied, sediments contained up to eight times more organic carbon than nearby forest soils.

researcher in waterproof clothing standing in stream, surrounded by green grass and trees
Researcher collecting water samples to analyse dissolved carbon concentrations.
Annegret Larsen, CC BY-NC-ND

Wetlands usually produce methane, a powerful greenhouse gas. This has raised concerns that beaver ponds might actually worsen climate warming.

But in our study, methane emissions were extremely small – less than 0.1% of the total carbon balance.

Most greenhouse gas emissions came from carbon dioxide released from sediments exposed during the drier summer periods. Even then, these emissions were smaller than the amount of carbon being stored in sediments and wood.

Over the course of one year, the wetland stored more carbon than it released.

With and without beavers

To understand the role of the animals themselves, we compared the beaver wetland with a scenario where the same river remained a normal flowing stream with a forested floodplain.

Forests are already important carbon stores. Trees capture carbon as they grow, and some of that carbon remains locked in soils and dead wood.

Without beaver dams, the river would stay largely confined to its channel. Water would move quickly downstream, carrying sediments and carbon away rather than trapping them across the floodplain.

Our calculations show that this forested river corridor would store only a small fraction of the carbon held in the beaver wetland. So the presence of beavers increased carbon storage by about an order of magnitude over the course of a decade.

As beaver populations expand across Europe, they could improve carbon storage in river landscapes. When we scaled our results up to the area of floodplains in Switzerland suitable for beaver recolonisation, we estimated that the potential carbon storage could offset roughly 1–2% of the country’s annual emissions.

That might sound small. But it would happen without any expensive technology, infrastructure or active intervention. It would simply come from allowing a native species to rebuild the wetlands that once existed along many of these rivers.

Beavers are not going to solve climate change, but our research shows these natural engineers can quietly help river landscapes store more carbon for decades to come.

The Conversation

Joshua Larsen receives funding from UK Research and Innovation (UKRI)

Annegret Larsen receives funding from the Swiss Federal Office for the Environment.

Lukas Hallberg does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Beavers can turn streams into carbon stores – we measured how much – https://theconversation.com/beavers-can-turn-streams-into-carbon-stores-we-measured-how-much-278489

La théorie des cordes a-t-elle été découverte par accident ?

Source: The Conversation – France in French (2) – By Piotr Tourkine, Physicien théoricien, Université Savoie Mont Blanc

Gabriele Veneziano au bord du lac d’Annecy (Haute-Savoie), l’été où il mit le doigt par hasard sur une formule qui allait mener à la découverte de la théorie des cordes. G. Veneziano, avec son aimable autorisation, Fourni par l’auteur

Une plongée dans l’histoire de la théorie des cordes, ou quand une solution suggérée pour un problème donné éclaira en réalité un domaine bien plus vaste.


La physique théorique a connu trois grandes révolutions au tournant du XXᵉ siècle : la mécanique quantique et les deux théories de la relativité, restreinte et généralisée. La mécanique quantique décrit l’infiniment petit. La relativité restreinte et sa célèbre formule E = mc² décrivent la physique des objets se déplaçant aux vitesses proches de la lumière. La relativité générale décrit la force de gravité comme provenant de la courbure de l’espace-temps.

Prises ensemble, elles ont bouleversé notre compréhension de l’espace-temps, de la matière, et des interactions fondamentales. Les implications de ce bouleversement ne sont encore aujourd’hui pas totalement comprises.

En effet, on ne sait pas utiliser ce cadre pour décrire certaines situations extrêmes, comme l’espace-temps à l’intérieur des trous noirs, ou au moment du Big Bang – deux situations où les effets quantiques et gravitationnels sont simultanément importants. C’est dans cet entrelacs que réside le mystère central de la « gravité quantique », que la physique moderne cherche à élucider, et pour lequel la théorie des cordes propose un cadre qui unifie relativité générale et physique quantique.

Du point de vue de l’histoire des sciences, un élément remarquable de cette théorie sophistiquée est qu’elle a, en fait, été découverte par hasard, au sein d’un domaine bien différent de la gravité quantique : celui de la physique des particules subatomiques !

Gabriele Veneziano et les particules subatomiques

Genève, fin des années 1960. Gabriele Veneziano a 26 ans, il vient de finir son doctorat de physique nucléaire en Israël et se trouve en visite au CERN. À l’époque, les physiciens théoriciens du monde entier se heurtaient à un problème coriace : la méthode qui avait permis de comprendre les interactions entre électrons et lumière (qu’on appelle aujourd’hui la théorie quantique des champs) semblait ne pas fonctionner pour décrire les interactions entre les autres particules subatomiques.

En particulier, on ne comprenait pas l’interaction nucléaire forte, qui régit les interactions entre les briques élémentaires de la matière : protons, neutrons, etc. Celles-ci forment un véritable zoo de particules qu’on nomme les hadrons.

Une nouvelle approche est alors explorée : le « bootstrap ». Ne pouvant trouver la bonne théorie pour décrire les hadrons individuellement, les physiciens se posèrent la question dans l’autre sens : quelles sont les propriétés générales que doit satisfaire n’importe quelle théorie ? La réponse : au minimum, elle doit satisfaire simultanément aux exigences de la mécanique quantique et de la relativité restreinte.

Cette approche par exemple permet de montrer qu’une interaction fondamentale ne peut excéder une certaine intensité sans briser les lois de la mécanique quantique (un peu comme il existe une vitesse maximale en relativité). En clair : si l’on mélange les lois de la mécanique quantique et celles de la relativité restreinte, tout n’est pas permis, et les lois physiques possibles deviennent fortement contraintes.

C’est dans ce cadre que Gabriele Veneziano proposa en 1968 une fonction mathématique très particulière – la fonction bêta d’Euler – pour modéliser les hadrons et leurs interactions. À ce moment, on ne connaissait pas la théorie qui permettrait d’expliquer d’où sort cette formule : on savait seulement qu’elle satisfaisait, pour la première fois, toutes les propriétés mathématiques recherchées. Son papier eut un succès immédiat, car la formule répondait à de nombreuses questions en même temps.

Sérendipité et théorie des cordes

La sérendipité est souvent idéalisée comme un heureux hasard. Mais, en science, elle prend une forme plus subtile : elle naît de l’interaction entre un contexte de recherche fertile et une capacité à reconnaître qu’une solution trouvée pour un problème donné éclaire en réalité un domaine bien plus vaste.

Le cas de la formule de Veneziano est emblématique. Quelques années après l’article de Veneziano, les physiciens Leonard Susskind, Yoichiro Nambu et Holger Bech Nielsen comprirent (indépendamment) que cette formule décrivait en fait non pas des hadrons mais des « cordes quantiques », c’est-à-dire des objets microscopiques filiformes, qui vibrent à la manière de minuscules cordes de violon.

Et c’est là que ça devient vraiment intéressant.

Les cordes et le… graviton ?

Depuis les années 1970, à mesure que l’on explore cette interprétation, d’autres indices troublants apparaissent. La théorie semble invariablement contenir une particule particulière : le graviton, censé véhiculer la force de gravitation quantique. De plus, elle exige l’existence de dimensions d’espace supplémentaires – un prix qui semble alors trop élevé pour une théorie censée décrire les hadrons !

Et surtout, comment une théorie inventée pour décrire les interactions de la matière à l’intérieur du noyau atomique pouvait-elle contenir une théorie qui décrit tout autre chose – la gravité quantique ?

Comme, à la même époque (autour de 1973), la théorie quantique des champs finit par expliquer les interactions fortes grâce à la découverte de la chromodynamique quantique, et notamment de la liberté asymptotique, le modèle de Veneziano est laissé de côté dans ce contexte.

Mais quelques physiciens visionnaires, comme Joël Scherk et John Schwarz, pressentirent que cette théorie, à cause de son mystérieux graviton, possédait un potentiel unique pour s’attaquer à la gravité quantique.

Dix ans plus tard, en 1984, Michael Green et John Schwarz confirmèrent cette intuition et démontrèrent que la théorie des cordes est bel et bien une véritable théorie de gravité quantique.

On voit donc que la découverte de la théorie des cordes est l’illustration même de la sérendipité : une théorie née d’un certain questionnement éclaire le cœur d’un aspect tout autre de la science.

Gabriele Veneziano lui aussi contribuera notablement au développement de la théorie des cordes, notamment en étudiant les liens entre celle-ci et la structure microscopique de l’espace-temps.

La théorie de cordes aujourd’hui

Aujourd’hui, la théorie des cordes est bien plus qu’une simple théorie candidate de la gravité quantique. Aux côtés de la théorie quantique des champs, elle constitue un cadre conceptuel et mathématique d’une richesse inégalée, capable d’unifier des idées venues de la physique des particules, de la relativité, de la théorie des champs, du chaos et des mathématiques pures et produire des avancées conceptuelles et techniques dans ces domaines.

Par exemple, le modèle de Veneziano et ses généralisations, dont on sait aujourd’hui qu’ils proviennent de la théorie des cordes, exhibent des propriétés mathématiques remarquables liées à la fonction zêta de Riemann. Ces propriétés s’expliquent physiquement par la façon dont deux cordes ouvertes s’attachent pour former une corde fermée.

Plus encore, le programme du « bootstrap », qui avait donné naissance à la théorie des cordes, connaît aujourd’hui une nouvelle vie : grâce à la puissance des ordinateurs modernes et à des idées venues de la théorie des cordes et de la théorie des champs, les physiciens appliquent ces idées pour décrire des phénomènes très divers, allant des transitions de phase à la physique hadronique et même à la gravité quantique.

Mais il reste un mystère fondamental : pourquoi cette théorie, née « par hasard », semble-t-elle si naturellement adaptée à décrire la gravité quantique ? Était-ce vraiment un hasard… ou un indice que la seule façon d’unifier les trois théories qui forment le socle de la physique du XXᵉ siècle est la théorie des cordes ? On pourrait bien avoir une réponse à cette question mathématique dans les années qui viennent.

The Conversation

Piotr Tourkine a reçu des financements de l’Agence Nationale de la Recherche (ANR-22-CE31-0017).

ref. La théorie des cordes a-t-elle été découverte par accident ? – https://theconversation.com/la-theorie-des-cordes-a-t-elle-ete-decouverte-par-accident-273306

Les manchots d’Afrique sont en danger : comment éviter leur extinction

Source: The Conversation – in French – By Jacqui Glencross, Seabird ecologist, University of St Andrews

L’Afrique du Sud abrite 88 % des colonies mondiales de manchots d’Afrique. L’espèce est classée en danger critique d’extinction par l’Union internationale pour la conservation de la nature. Cela signifie qu’il existe un risque élevé que ces oiseaux disparaissent à l’état sauvage suite au déclin rapide de leur population.

Cette espèce était autrefois abondante le long des côtes d’Afrique du Sud et de Namibie. Mais sa population a chuté d’environ 78 % au cours des 30 dernières années, en raison du manque de nourriture, des marées noires et des changements climatiques dans l’environnement marin. Les manchots d’Afrique se nourrissent principalement d’anchois et de sardines.

Les changements dans les conditions océaniques et la surpêche ont rendu plus difficile pour les manchots de trouver suffisamment de nourriture. Ces dernières années, les organisations de conservation, les scientifiques et les agences gouvernementales ont intensifié leurs efforts pour enrayer ce déclin.

L’une des avancées les plus significatives a été une décision de justice rendue en mars 2025 qui a soutenu la mise en place de zones d’interdiction de pêche améliorées autour des principales colonies de reproduction, afin de protéger les zones d’alimentation des manchots. Robben Island (à 11 km au nord-ouest du Cap) est l’une de ces colonies.

La protection des eaux adjacentes aux colonies de reproduction est essentielle pour le rétablissement à long terme de l’espèce. Le manque de nourriture dans ces zones, dû en partie à la concurrence avec la pêche à la senne coulissante (qui utilise un grand filet pour encercler les bancs de poissons), a été directement lié au déclin de la survie des poussins et à l’effondrement continu de la population.

Le procès (mené par les organisations BirdLife South Africa et Southern African Foundation for the Conservation of Coastal Birds) a conclu que la pêche ne pouvait plus être pratiquée dans un rayon de 20 km autour de Robben Island.

Nous sommes des chercheurs spécialistes des manchots, issus de l’université de St Andrews, de l’université d’Exeter, du ministère sud-africain des Forêts, de la Pêche et de l’Environnement, et de BirdLife South Africa.

Nos travaux ont examiné en détail les interactions entre les manchots et les activités de pêche, et peuvent fournir des informations utiles pour orienter la gestion de leurs besoins respectifs.

Chevauchement avec l’industrie de la pêche

Des recherches sur les effets de la pêche sur les populations de manchots ont principalement porté sur des paramètres tels que la quantité de poissons prélevés par la pêche. Mais la technologie permettant de suivre les lieux de pêche et les déplacements des animaux nous permet désormais d’avoir une vision précise à l’échelle spatiale. Nous pouvons voir où et dans quelle mesure la pêche commerciale et les pingouins se chevauchent, ce qui nous aide à identifier les zones qui devraient être protégées.

Nos récentes recherches ont utilisé les données de suivi des manchots des îles Robben et Dassen, dans la province du Cap-Occidental en Afrique du Sud. Nous avons mesuré le chevauchement spatial au niveau de la population entre les manchots et la pêche locale. Une petite partie des manchots a été suivie à l’aide d’appareils GPS, ce qui nous a permis de simuler les déplacements de la majeure partie de la colonie.

Savoir où une grande partie de la population de manchots partage un espace particulier avec des navires de pêche permet de cibler plus facilement les zones à protéger et les périodes où cela est nécessaire. Cela présente des avantages à la fois pour l’industrie de la pêche (en lui permettant de pêcher dans des zones moins importantes pour les manchots) et pour ces derniers (en réduisant la concurrence avec la pêche pendant la saison de reproduction).

Nous avons également développé une nouvelle mesure, l’« intensité du chevauchement », qui permet non seulement de déterminer l’espace partagé par les manchots et les navires de pêche, mais aussi le nombre de manchots concernés. Les mesures traditionnelles du chevauchement spatial se contentent de calculer le pourcentage de zone partagée entre les prédateurs (manchots) et les navires de pêche. Mais cela peut conduire à une sous-estimation considérable du degré réel d’interaction, en particulier lorsque seules quelques zones sont partagées mais que de nombreux animaux les utilisent.

Cela permet de mieux comprendre la pression écologique et la concurrence, ce que le chevauchement de zones seul ne permet pas. Par exemple, cela suggère une concurrence plus forte pour les proies que ne le laissent entendre les mesures de chevauchement spatial. Cette méthode peut non seulement être étendue à d’autres colonies, mais aussi, plus largement, à d’autres espèces et écosystèmes.

Nos résultats montrent que le chevauchement augmente fortement les années où les poissons se font rares. En 2016, une année où les stocks de poissons étaient faibles, environ 20 % des manchots se nourrissaient dans les mêmes zones que les navires de pêche actifs. Cependant, les années où les stocks de poissons étaient plus importants, le chevauchement est tombé à seulement 4 %. Cette tendance indique que la concurrence entre les manchots et la pêche s’intensifie lorsque les proies sont limitées. Le risque est le plus élevé pendant les périodes sensibles telles que l’élevage des poussins, lorsque les adultes doivent se nourrir efficacement pour subvenir aux besoins de leurs petits.

Un nouvel outil pour la gestion des risques

En quantifiant l’intensité du chevauchement au niveau de la population, notre étude offre un nouvel outil puissant pour évaluer les risques écologiques et soutenir la gestion des pêcheries basée sur les écosystèmes. Elle fournit également des conseils pratiques pour la conception de zones marines protégées dynamiques qui répondent aux changements en temps réel dans les interactions prédateurs-proies.

Nos résultats montrent en outre que la nouvelle zone d’interdiction de pêche autour de Robben Island protégera une zone d’alimentation clé au nord-est de la colonie. Cette région était auparavant l’une de celles où le chevauchement entre les manchots et les navires de pêche était le plus important.

Une surveillance continue sera essentielle pour déterminer comment le chevauchement évolue en réponse à la nouvelle interdiction de pêche à la senne coulissante pendant dix ans autour des deux colonies. Des évaluations similaires devraient également être menées sur d’autres sites de reproduction, y compris d’autres îles concernées par l’interdiction. Les zones d’alimentation des manchots et les zones couvertes par les zones d’interdiction de pêche varient d’une colonie à l’autre.

Par ailleurs, au cours des dernières années, des ponts-bascules ont été installés dans certaines colonies (y compris Robben Island) afin de peser les manchots lorsqu’ils partent se nourrir et lorsqu’ils reviennent. Les données recueillies à l’aide de ces grandes balances nous en apprendront davantage sur l’impact des fermetures sur le succès de l’alimentation des manchots.

The Conversation

Jacqui Glencross does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Les manchots d’Afrique sont en danger : comment éviter leur extinction – https://theconversation.com/les-manchots-dafrique-sont-en-danger-comment-eviter-leur-extinction-277329

Can’t stop endlessly scrolling? Tips to help you take back control

Source: The Conversation – Global Perspectives – By Sharon Horwood, Senior Lecturer in Psychology, Deakin University

It’s called the infinite scroll – a design feature on social media, shopping, video and many other apps that continuously loads content as you reach the bottom of the page. Handy? Yes. Clever? Also yes. Devious? Very much so. The infinite scroll is likely the main reason you find it so hard to stop scrolling once you begin.

To understand why this design feature is so devious, we need to understand the psychology and behaviours it taps into.

First, the infinite scroll takes away a natural stopping point – where you might decide that’s enough social media for today. For example, Instagram feeds once stopped after all chronologically new posts from followed accounts had been viewed, and even told us we were “all caught up” for the day. Now, algorithmic feeds combined with the infinite scroll mean there’s no way to ever be caught up with it all.

The second reason you find it so hard to stop scrolling is the promise of something good that might be just about to pop up in your feed. The algorithm “knows” what you like. So, hand-in-hand with the infinite scroll, it keeps feeding you all those tasty tid-bits.

Putting it bluntly, these features help create an addiction of sorts. The promise of a little hit of dopamine when we see content we love. And addictions are hard to beat – but not impossible.

Here are some quick wins and longer-term solutions if you want to break free from the grip of the scroll.

The quick wins

Create a break

Your device might be the problem, but it can also be part of the solution. Start by using your phone’s screen time features – such as Android’s Digital Wellbeing or Apple’s Screen Time.

You can also install a more sophisticated third-party app that forces you to break the patterns of mindless scrolling behaviour.

Apps such as One Sec, ScreenZen, Opal and Freedom can short-circuit the automatic habits associated with scrolling in various ways. These include putting mandatory pauses before social media apps open, or applying colour filters (like grayscale) to make apps less appealing.

They can even hard-block apps for specific periods of time if you really need a tough love approach.

Remove social media apps

This one’s usually met with an audible gasp when I suggest it, but you might find you adapt to not having social media at your fingertips faster than you’d imagine. You’re not deleting your accounts – just making it harder to open them and scroll.

Schedule some scrolling time

If you can’t imagine life without scrolling, schedule time each day for just that activity. It could be in your lunch break or when you get home from work: give yourself the freedom to scroll for the amount of time you set (say, 15 minutes) and don’t feel guilty about it. Just remember you still have to close the apps and get on with your life as soon as the time is up.

The hard work

The above might limit your scrolling in the short term, but long-term benefits (and emotional freedom) will likely take a bit more work.

The “easy” tips often work for a little while, when you’re motivated to change and feeling optimistic. But time and the pressures of life can start to erode your convictions.

So, to gain true freedom from scrolling, think about social media and whether it’s a relationship that serves you well. If you feel like it’s controlling you far more than you are controlling it, here are some things to consider. Be warned, they might not be easy.

What’s the deeper reason?

Think deeply about why you’re scrolling so much in the first place. Is it a lack of willpower? Are you avoiding something or someone? Are you suppressing feelings that you would prefer not to acknowledge?

All of these things can be reasons why we seek distraction. You might be avoiding a big thing (the state of a relationship) or a small thing (cooking dinner), but either way, scrolling is the symptom, not the disease. So, consider if scrolling might be part of a bigger problem you need to deal with instead.

Who’s benefiting whom?

Consider how much you really “need” social media. Do you actively use it in a way that benefits you (for example, as a business platform) or did you sign up out of curiosity years ago and have never really questioned why you’re still using it?

If it’s the latter, apply a critical lens to the platforms you use and how they serve you. On average, Australians use six to seven different social media platforms regularly. Think about what you might gain from spending less time scrolling, but also think about whether your life would be worse without some of them.

If you can’t think of a really compelling reason as to why it would be worse, it might be time to say goodbye to a few.

These “hard” options will take time and effort, and require you to reflect on your habits. But, like with most things, the reward for effort is likely to be greater, and last longer.

The Conversation

Sharon Horwood does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Can’t stop endlessly scrolling? Tips to help you take back control – https://theconversation.com/cant-stop-endlessly-scrolling-tips-to-help-you-take-back-control-278418

Attacks on hospitals are surging in war zones. What do the laws of war say about protecting them?

Source: The Conversation – Global Perspectives – By Shannon Bosch, Associate Professor (Law), Edith Cowan University

Afghanistan says at least 400 people have been killed in a Pakistani airstrike on a drug rehabilitation hospital in Kabul on Monday night, with potentially hundreds more wounded.

Pakistan has denied deliberately targeting the health-care facility. In a statement on X, the Pakistani Information and Broadcasting Ministry said the strikes “precisely targeted military installations and terrorist support infrastructure including technical equipment storage and ammunition storage of Afghan Taliban”.

Attacks on health-care facilities are surging worldwide.

On March 14, an Israeli airstrike hit a health-care facility in Lebanon, killing 12 doctors, nurses and paramedics. The strike brought the number of health-care workers killed in Lebanon in recent days to 31.

Since early March, the World Health Organization (WHO) has verified 27 attacks on health-care facilities in Lebanon alone, as Israeli strikes in Lebanon and joint US–Israeli operations in Iran have intensified.

The Office of the High Commissioner for Human Rights (OHCHR) and the WHO condemned these attacks as violations of international law.

So, what laws protect medical facilities, staff and patients during conflict? And do they lose this protection if facilities are used to shelter combatants?

What the ‘laws of war’ say about protecting hospitals

International humanitarian law contains detailed rules to protect medical personnel, facilities and the sick and wounded during armed conflict.

Under these “laws of war”:

  • medical personnel, including doctors, nurses and paramedics, must be respected and protected while performing their duties

  • there are special protections for ambulances and transport used exclusively for medical purposes

  • these protections extend to the wounded and sick in their care. This includes enemy fighters who require treatment and are no longer taking part in hostilities

  • impartial humanitarian organisations must be allowed to provide medical assistance. Consent to their work cannot be refused arbitrarily

  • medical facilities must display the distinctive protective emblems of the Red Cross, Red Crescent or Red Crystal. Medical personnel must carry identification and armlets displaying these emblems

  • misusing these symbols to shield military operations is prohibited. Doing so may amount to perfidy, a type of deliberate deception which is a war crime under international law

  • deliberately attacking medical personnel or facilities displaying these emblems can also constitute a war crime.

Shattered glass surrounds a damaged hospital ward.
Damage caused by US and Israeli attacks on Shahid Motahhari Hospital in Tehran.
Anadolu/Getty

Where did these rules come from?

The laws protecting medical services in war emerged in response to the enormous suffering witnessed in 19th and 20th-century conflicts.

The first treaty protecting wounded soldiers and medical personnel dates back to 1864, when states adopted the original Geneva Convention.

Today, the 1949 Geneva Conventions, their Additional Protocols, together with a body of customary international law, form a near-universal legal framework binding all parties to conflict. This includes non-state armed groups.

These rules require warring parties to respect and protect medical personnel, facilities and the wounded and sick in all circumstances.

Why are attacks on health care increasing?

In January, Médecins Sans Frontières (MSF) reported attacks on medical facilities and personnel had reached unprecedented levels around the world. In 2025 alone, there were 1,348 attacks on health-care facilities, double the number reported in 2024.

The law itself has not changed. But warfare has. Recent conflicts in South Sudan, Ukraine, Gaza, Iran and Lebanon are taking place in densely populated urban environments. Armed groups operate within complex civilian settings, often near hospitals and clinics.




Read more:
Attacks on health care during war are becoming more common, creating devastating ripple effects


This has shifted the narrative used by some warring parties. What were once described as “mistaken attacks” are now frequently justified on grounds of military necessity. States often claim insurgents are exploiting hospitals or ambulances to gain military advantage.

Israel, for example, has accused Hezbollah and Hamas of using medical infrastructure for military purposes.

Can hospitals lose their protection if fighters are hiding inside?

Yes. Hospitals can lose their special protection if they are used, outside their humanitarian role, to harm the enemy.

However, the law sets a very high threshold for this.

Medical personnel may carry light weapons for self-defence. Armed guards may be present to protect the facility. The presence of wounded fighters receiving treatment does not change this – protections still apply.

Protection may be lost only if hospitals are used for activities such as:

  • launching attacks

  • serving as an observation post

  • storing weapons

  • acting as a command or liaison centre

  • sheltering able-bodied combatants.

Even then, in cases of doubt hospitals must be presumed protected.

Importantly, verifying a hospital is being misused does not give parties a free licence to attack.

Before launching an attack on a compromised medical facility, international humanitarian law requires a warning to be issued, and reasonable time allowed for the misuse to stop.

If the warning is ignored, the attacking party must still comply with the core principles of international humanitarian law:

Proportionality

The expected military advantage must be weighed against the humanitarian consequences of the attack. This includes long-term impacts on health-care services. If the expected civilian harm would be excessive, the attack must be cancelled.

Precautions

All feasible precautions must be taken to minimise harm to patients and medical staff. This may include facilitating evacuations, planning for disruption to medical services, and helping restore health-care capacity after the attack.

Even when a facility loses protection, the wounded and sick must still be respected and protected.




Read more:
Health-care workers should not be a target. In Gaza, their detention and death affect the entire population


Are attacks on health care becoming normalised?

The UN Security Council, WHO, MSF and the OHCHR have expressed concern attacks on medical personnel and facilities – and the lack of accountability for them – are becoming dangerously normalised.

The legal framework protecting hospitals and health-care workers already exists.

States and armed groups must disseminate the law and train their military forces.

National legal systems are expected to investigate and prosecute those perpetrating war crimes against the wounded and sick, medical personnel and their facilities, or misusing protective emblems for military advantage.

In practice, however, investigating attacks during active conflict is extremely challenging. Territorial states are often unwilling or unable to pursue prosecutions.

Can we reverse this trend?

Open-source investigative groups such as Forensic Architecture, Bellingcat, Mnemonics and Airwars now play a growing role in preserving satellite imagery, geo-location data, and videos uploaded to social media. These allow independent fact-finding missions to conduct credible investigations. They may pursue accountability even when territorial states are unwilling or unable to do so.

Without such accountability, places meant to save lives during conflict may increasingly become targets themselves.

The Conversation

Shannon Bosch does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Attacks on hospitals are surging in war zones. What do the laws of war say about protecting them? – https://theconversation.com/attacks-on-hospitals-are-surging-in-war-zones-what-do-the-laws-of-war-say-about-protecting-them-278414

As the war drags on, what does victory look like for the US, Israel and Iran?

Source: The Conversation – Global Perspectives – By Amin Saikal, Emeritus Professor of Middle Eastern Studies, Australian National University; The University of Western Australia; Victoria University

As the Middle East war enters its third week, there is no sign from either Iran or the United States and Israel that they will stop the fighting any time soon. It is getting more violent and nasty by the day.

The Iranian Islamic regime is fighting for its survival, while the US and Israel want to substantially degrade or destroy it.

The Iranian side lacks the US and Israeli firepower, yet it has proved to be more resilient than its adversaries may have expected. It has resolved to fight for as long as possible and inflict as much economic pain regionally and globally as is necessary.

So where do things go from here? What do the US and Israel want to achieve in the war, and how might it end?

Trump’s incoherent objectives

The US and Israel launched this “war of choice” against Iran on February 28. Trump evidently expected the formidable US air and naval power, as well as Israeli air power, would rapidly prevail.

At a minimum, Trump was anticipating the Iranian regime would then accept his demand for a favourable nuclear deal. But he was also suggesting broader aims aligned with Israeli Prime Minister Benjamin Netanyahu’s objectives – to force Iran to forfeit its long-range ballistic missiles and sever its ties with regional proxies.

This would then open the way for Iran’s restless population to resume their protests, aiming to topple the regime and replace it with one acceptable to Washington and Jerusalem.

But this has not happened.

It is now abundantly clear the US and Israel started a war without a clear goal, strategy, timeline, end game or justification. There was also no adherence to international law.

The Trump administrations’s objectives have been confusing and contradictory, with different narratives being spun by the president and his main advisers.

They have included everything from freeing the oppressed Iranian people to removing a direct threat to America and destroying Iran’s nuclear program and missile capability. (Never mind Trump previously claimed he had “obliterated” Iran’s nuclear program in last year’s bombing campaign.)

Trump has also called for regime change, or as he put it, “a little excursion” to get rid of “some evil” leaders.

Trump attempts to clarify reasons for Iran war.

Trump has further claimed the human and economic cost of the war – including oil and gas shortages worldwide – will be temporary. But when the fighting will stop is anyone’s guess. Trump has insisted the war is already won, then said it will only end when he feels it in his “bones”.

In the meantime, the US has intensified its air bombardment of Iran, claiming to have hit 15,000 targets and destroyed every military site on Kharg Island in the Persian Gulf, the main terminal for exporting 90% of the country’s oil.

Trump is now reportedly considering sending US forces to occupy the island, while inviting US allies, as well as China, to help reopen the Strait of Hormuz to oil shipments.

Inviting China to such a coalition is a fanciful idea – it has good relations with Iran. Most other countries have thus far refused to commit.

Israel’s one clear goal

While Trump’s goals seem to change by the minute, Netanyahu has a more clear war objective. He wants to destroy not only the Islamic regime but also diminish the Iranian state, no matter the consequences for the Iranian people and territorial integrity.

He has also lately been vocal about his ambition for a Biblical notion of “greater Israel”, based on the Book of Genesis, spanning from the Euphrates River to the Nile River. The US ambassador to Israel, Mike Huckabee, backed him on this in a recent interview with Tucker Carlson.

Although Netanyahu has been widely condemned for voicing these ambitions, he has not backed away from them.

Meanwhile, Israel has also just sent troops into southern Lebanon for what it calls “limited and targeted ground operations” against Hezbollah, though many fear this could lead to a prolonged occupation. Israel’s defence minister says residents will not be permitted to return until the safety of northern Israel is secured.

Iran’s strategy: hold on

Whatever one’s view of the Iranian regime, it has been more goal-oriented and strategic than its adversaries. It has also displayed a remarkable degree of entrenchment and durability.

The regime rapidly replaced the slain supreme leader with his son, Mojtaba Khamenei, though he has not yet been seen in public.

Despite all the internal and external pressure the regime is facing, the members of its heavily armed and well-structured security and bureaucratic apparatus have remained solidly loyal.

And though thousands joined street protests against the regime before they were quashed in January, other Iranians have united behind the regime. Many Iranians have historically been motivated to support the regime against external aggression, due to civilisational pride, a Shia tradition of martyrdom and a strong sense of nationalism.

On the battlefield, the regime is pursuing a strategy of asymmetrical warfare, with the aim of outlasting the US and Israel and inflicting as much damage as possible. This entails turning the war into a regional conflict to pressure the Arab states in the Persian Gulf to push the Trump administration for an end to the war – and perhaps reconsider their reliance on the US as a security provider.

The regime has managed to hold out so far, and rejected any negotiations.

Two possible outcomes

As the situation stands now, the scene is set for a long, bloody and destructive war. Each of the protagonists has painted itself into a corner and doesn’t know how to get out.

There are two possible ways the war could end.

The first is centred on hardware. Whichever side depletes its stocks of missiles and interceptors first could signal a desire to end the fighting.

The second possibility is that Trump claims he has degraded the regime sufficiently and declares a kind of victory. He has hinted at this already given the domestic opposition to the war (including some of his influential MAGA supporters), the growing economic costs of the war, and the impending midterm elections.

If this happens, the Islamic regime will also claim victory, given it has held on and remains intact.

Whatever the outcome, the Iranian and Lebanese civilians would have borne the brunt of this war, and the region will transition to another historical phase of uncertainty and instability in a highly polarised world.

The Conversation

Amin Saikal does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. As the war drags on, what does victory look like for the US, Israel and Iran? – https://theconversation.com/as-the-war-drags-on-what-does-victory-look-like-for-the-us-israel-and-iran-278520

Trump’s war language is aggressive and extreme. It also offers some insight into his thinking

Source: The Conversation – Global Perspectives – By Rodrigo Praino, Professor & Director, Jeff Bleich Centre for Democracy and Disruptive Technologies, Flinders University

US President Donald Trump speaks in a way unlike any of his predecessors. His distinctive and highly recognisable style may even play a role in his appeal to his political base. Since the infamous Access Hollywood tapes, he has got away with saying things none of his predecessors would have ever dreamed of saying in public. This is particularly striking in a country that was shocked to learn in the 1970s that Richard Nixon used dirty words in the Oval Office.

Scholars have described Trump’s rhetorical style as “unbalanced vituperation”, stressing his constant use of demeaning language, false equivalences and exclusion.

Even more strikingly, a recent study found Trump’s use of violent vocabulary, especially language linked to war and crime, represents a radical departure from US political tradition.

Since the beginning of the war with Iran, Trump’s rhetoric has become even more combative and outrageous, marking an even sharper shift from the language used by his predecessors in similar occasions.

What effect does this have and what does it tell us about the commander-in-chief’s state of mind?

Demeaning opponents

Trump announced the death of Iran’s Supreme Leader Ayatollah Ali Khamenei by calling him a “wretched and vile man”. Later, in a Truth Social post, he called him “one of the most evil people in history” and referred to “his gang of bloodthirsty thugs”.

A few days later, he continued denigrating leaders of the Iranian regime, describing them as “deranged scumbags” whose killing was for him a “great honor”. He has also insulted Mojtaba Khamenei, who succeeded his father as Iran’s Supreme Leader, describing him as “unacceptable” and a “lightweight”. He also stated during an interview that he believes Mojtaba is alive but “damaged”.

Americans are no strangers to their presidents using strong language to describe adversaries. Ronald Reagan famously referred to the Soviet Union as an “evil empire”, and George W. Bush warned of an “Axis of Evil”.

Yet such rhetoric rarely extended to personal insults against individual foreign leaders. Leaders generally bring a mood to these speeches that recognises their words will be frightening for many people. It also acknowledges that in a war situation, lives will inevitably be lost.

George W. Bush, for example, simply stated that US forces “captured Saddam Hussein alive”. Barack Obama announced to the nation Osama bin Laden’s killing by addressing the mastermind of the worst terrorist attack on US soil simply as “Osama bin Laden, leader of al Qaeda, and a terrorist”.

Constant threats

Trump has also shown little restraint in issuing threats. At the beginning of the conflict he stated in an interview that they had not even started hitting Iran hard and that the “big wave” was coming soon. He later posted on Truth Social that he was ready to hit Iran “twenty times harder” and threatened to “make it virtually impossible for Iran to ever be built back, as a Nation, again”, adding that “death, fire and fury will reign [sic] upon them”. At one point, he even suggested that he might strike Iran’s Kharg Island oil export hub again “just for fun”.

This language is not only vitriolic. It also is in sharp contrast with the rhetoric of past US presidents who often emphasised restraint in the use of force and showed willingness to de-escalate military conflicts.

Previous presidents have been very clear about the strength of the US military, but they have also tried to focus on diplomacy and negotiation.

Obama, talking about Syria, famously remarked that “the United States military doesn’t do pinpricks”. Yet, moments later, he asked Congress to postpone a vote authorising the use of force while his administration pursued diplomatic options.

Nixon stated during the Vietnam war that “The peace we seek to win is not victory over any other people, but the peace that comes ‘with healing in its wings’; with compassion for those who have suffered; with understanding for those who have opposed us; with the opportunity for all the peoples of this Earth to choose their own destiny”.

Trump’s threats of escalation also raise concerns about the safety of civilians and the protection of critical infrastructure. He recently stated he “didn’t do anything to do with the energy lines, because having to rebuild that would take years”. This remark suggests some awareness of the consequences of such actions.

Even so, earlier presidents often distinguished explicitly between military targets and civilian populations. George H. W. Bush, during the Gulf War, declared “our quarrel is not with the people of Iraq. We do not wish for them to suffer”.

In 2023, George W. Bush warned Iraqi military and civilian personnel: “do not destroy oils wells, a source of wealth that belongs to the Iraqi people. Do not obey any command to use weapons of mass destruction against anyone, including the Iraqi people”.

Words matter

It is still unclear why Trump’s rhetoric is so violent and so far removed from the language of virtually every US president before him. A 2020 study found Trump’s foreign policy rhetoric often aims to create a sense of crisis to mobilise his domestic base – or distract from political troubles at home.

Some observers argue Trump has used, or even manufactured, national crises as a mechanism to expand executive power through emergency declarations. Whether this is the case in the current war with Iran remains to be seen.

But words certainly matter.

On December 19 1945, US President Harry S. Truman issued a special message to Congress recommending the Department of War and the Department of the Navy be merged into a single “Department of National Defense”. Between 1947 and 1949, Congress and the executive branch implemented this proposal. Many other countries went through a similar process in the postwar period, replacing the language of “war” from the name of their departments and ministries with the more restrained term “defence”.

Seventy-six years later, in 2025, Trump reversed that tradition with an executive order renaming the Department of Defense as the US Department of War.

This same executive order clearly states that the new name demonstrates a willingness to fight wars at a moment’s notice. And the reason is not only to defend, but to “secure what is ours”.

Viewed in light of the current war with Iran, those words provide some insight into the administration’s thinking. They also invite reflection on other words coming out of the administration and its supporters, including the “Gulf of America”, the idea of Canada as the “51st state”, and even the far-fetched “Trump 2028” chant.

The Conversation

Rodrigo Praino receives funding from the Australian Research Council and the Department of Defence.

ref. Trump’s war language is aggressive and extreme. It also offers some insight into his thinking – https://theconversation.com/trumps-war-language-is-aggressive-and-extreme-it-also-offers-some-insight-into-his-thinking-278427