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July 22, 2025

A global treaty to limit plastic pollution is within reach – will countries seize the moment?

Source: The Conversation – UK – By Winnie Courtene-Jones, Lecturer in Marine Pollution, Bangor University

Bandung, Indonesia. Sony Herdiana/Shutterstock

Representatives from 175 countries will gather in Geneva, Switzerland, in August for the final round of negotiations on a legally binding UN treaty to end plastic pollution. Non-governmental organisations, academics and industry lobbyists will also be in the room. They will all be hoping to influence what could be the world’s first truly global agreement on plastics.

The summit, known as “INC-5.2”, follows a failed attempt to reach agreement in Busan, South Korea, late last year. That meeting ended without resolving important issues, despite hopes that it would conclude the treaty process. Now, it’s crunch time in Geneva.

Either countries bridge their political divides, or risk the whole process falling apart.

I’ve been researching the effects of plastic for more than a decade and have been involved in the UN treaty process since 2022. I’ve attended several of the negotiations and will be in Geneva next month. The science is clear: we need ambitious action which tackles every stage of the plastics lifecycle, from production through to disposal. But the question is, will countries deliver?

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In 2022, the UN Environment Assembly agreed to develop a legally binding treaty to end plastic pollution. Since then, progress has been slow. Negotiations have repeatedly stalled over issues such as whether the treaty should limit plastic production or regulate chemicals, how to define terms, and how to fund implementation.

Industry lobbying has also played a powerful role throughout. At the last round of talks, lobbyists for the petrochemical and plastics industries made up the single largest delegation. They outnumbered representatives from the EU, all of Latin America, the Pacific islands, independent scientists and Indigenous communities. This imbalance threatens to weaken the science-based action that is urgently needed.

Although countries failed to reach agreement in Busan, a foundation was laid. They agreed to continue negotiations using the “chair’s text”, which is a draft treaty with multiple options still on the table. That document forms the starting point in Geneva. But it remains uncertain whether enough common ground can be found to finalise the text.

What’s at stake?

This treaty is a once-in-a-generation chance to tackle one of the world’s most urgent environmental crises. More than 450 million tonnes of plastic are produced every year. That figure is expected to double by 2045 if current trends continue.

Only around 9% of plastic is ever recycled. The rest is landfilled, incinerated or ends up polluting the environment.

An estimated 139 million tonnes of plastics pollute marine and fresh water. But that could be significantly higher when considering leakages of plastics to land, and from microplastics, which are plastics smaller than 5mm in diameter.

Plastic is found in the deepest oceans, the remotest mountains and inside the human body. While scientists are only beginning to understand the long-term implications for human health, biodiversity and climate, studies show harmful effects of plastics and their chemicals on animals and ecosystems.

Plastic pollution doesn’t respect national borders. It moves through rivers, oceans and air, and gets carried across continents. Global supply chains and waste exports have made this a problem no country can solve alone. That’s why a global treaty is essential.

Crossroads

Despite this growing urgency, a disparity in positions has hindered progress and continues to divide delegations.

Some, such as members of the High Ambition Coalition, a group of countries committed to progressive climate action, want strong rules to cap plastic production, phase out toxic chemicals and hold polluters accountable. Others, often with prominent petrochemical industries, argue for a weaker, voluntary approach focused mainly on recycling and waste management.

If these divisions aren’t resolved, there’s a real risk the treaty will end up being too watered down to make a difference. A patchy, fragmented agreement would fail to curb rising plastic production and could undermine the integrity of global action.

Between December’s meeting in Busan and next month’s talks, countries have been holding smaller meetings to try to find compromise. That momentum must now be carried into the final negotiations.

Important articles in the draft treaty, including those on chemicals and products, plastic production and finance, remain contested. Whether those provisions are strengthened or diluted will shape the treaty’s effects for decades to come.

Flexibility will be needed. But leadership is also crucial. Countries that support an ambitious outcome must stand firm and bring others with them.

As we approach what may be the final negotiating round, we’re at a critical crossroads. The world has the chance to take meaningful action on plastic pollution. Let’s not waste it.

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Winnie Courtene-Jones is an unpaid member and working-group lead of the Scientists’ Coalition for an Effective Treaty; an International network of independent scientific and technical experts contributing robust scientific evidence to the Treaty process.

– ref. A global treaty to limit plastic pollution is within reach – will countries seize the moment? – https://theconversation.com/a-global-treaty-to-limit-plastic-pollution-is-within-reach-will-countries-seize-the-moment-261331

July 22, 2025

From ‘MMS’ to ‘aerobic oxygen’, why drinking bleach has become a dangerous wellness trend

Source: The Conversation – UK – By Adam Taylor, Professor of Anatomy, Lancaster University

If something online promises to cure everything, it’s probably too good to be true. One of the most dangerous examples? Chlorine dioxide is often marketed under names like “Miracle Mineral Solution (MMS)” or “aerobic oxygen”, buzzwords that hint at health and vitality.

But in reality, these products can make you violently ill within hours – and in some cases, they can be fatal.

Despite what the name suggests, MMS is not just bleach. Bleach contains sodium hypochlorite, whereas MMS contains sodium chlorite – a different but equally toxic chemical.

When ingested, sodium chlorite can cause methemoglobinemia, a condition where red blood cells lose their ability to carry oxygen. It can also trigger haemolysis (the rupture of red blood cells), followed by kidney failure and death.

When sodium chlorite mixes with acid (such as stomach acid), it converts into chlorine dioxide, a bleaching agent. This compound has strong antimicrobial properties: it can kill bacteria, fungi and even viruses like SARS-CoV-2. For that reason, it’s commonly used in sanitising dental equipment and hospital tools like endoscopes. Its effectiveness at killing over 400 bacterial species makes it useful in cleaning – but not in humans.

While the mouth and oesophagus are lined with multiple cell layers, offering some protection, the stomach and intestines are far more vulnerable. These organs have a single-cell lining to absorb nutrients efficiently – but this also means they’re highly sensitive to damage.

That’s why ingesting chlorine dioxide often leads to nausea, vomiting, abdominal pain, and diarrhoea. In extreme cases, the chemical can burn through the gut lining, leading to bowel perforation – a medical emergency with a high risk of death.

Using MMS as an enema is equally dangerous. Chlorine dioxide can trigger an overproduction of reactive oxygen species – unstable molecules that damage cells and contribute to chronic gut conditions. This cellular stress may explain both the immediate symptoms and the long-term injuries seen in reported cases.

It doesn’t make a good mouthwash, either

Some sellers claim MMS can be used safely in the mouth because it’s found in dental cleaners. But clinical trials show it’s no more effective than other mouthwashes, and its oxidising power doesn’t distinguish between harmful microbes and healthy cells.

Yes, it may temporarily reduce bad breath, but it also disrupts protein synthesis, damages cell membranes, and harms the gut microbiome – the collection of helpful bacteria we rely on for digestion and immune health.

Chlorine dioxide doesn’t just attack the gut. It also affects the cardiovascular system. Documented risks include low blood pressure, fainting, and cardiac damage – including stroke and shock.

In some cases, it causes a dangerous blood disorder called disseminated intravascular coagulation (DIC). This condition causes abnormal clotting, followed by severe bleeding and potential organ failure, stroke and death.

Chlorine dioxide is also a respiratory irritant. Inhalation can inflame the nose, throat and lungs, and in severe cases, cause respiratory distress – particularly with repeated exposure in workplaces.

Studies of factory workers show that even low doses can lead to nasal inflammation, coughing and breathing difficulties. And some patients who drank chlorine dioxide to “treat” COVID-19 ended up with severe chemical lung injuries.

Risks to the brain, hormones and skin

Animal studies suggest chlorine dioxide can harm the nervous system, causing developmental delays, reduced movement, and slower brain growth. It also appears to affect the thyroid, potentially causing hormonal disruptions and delayed puberty.

It doesn’t stop there. Some people who consume chlorine dioxide also develop cerebral salt wasting syndrome, a condition where the kidneys lose too much sodium, leading to excessive urination, dehydration and dangerously low blood volume.

Skin contact isn’t safe either. Chlorine dioxide can irritate the skin, and lab studies show it can kill skin cells at high concentrations. People who’ve used it to treat fungal infections have ended up with chemical dermatitis instead.

Chlorine dioxide can be useful for disinfecting hospital tools, dental equipment and water supplies. But that doesn’t mean it belongs in your body. Many of its supposed “benefits” come from lab studies or animal research – not from safe, approved human trials.

There’s no evidence that drinking it cures any disease. There’s overwhelming evidence that it can harm or kill you.

So, if you’re tempted by a product that promises miracles with science-y language and zero regulation, take a step back. The risks are very real – and very dangerous.

Adam Taylor 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. From ‘MMS’ to ‘aerobic oxygen’, why drinking bleach has become a dangerous wellness trend – https://theconversation.com/from-mms-to-aerobic-oxygen-why-drinking-bleach-has-become-a-dangerous-wellness-trend-260761

July 22, 2025

No wonder England’s water needs cleaning up – most sewage discharges aren’t even classified as pollution incidents

Source: The Conversation – UK – By Alex Ford, Professor of Biology, University of Portsmouth

England’s privatised water industry may one day be considered a textbook case study of failed corporate responsibility, regulation and governance. The Cunliffe review, the recent report into England’s privatised water industry, concluded that the financial regulator, OfWat, needs to be disbanded and a new water regulator will be introduced.

For that to work effectively, better pollution monitoring and more clearly defined pollution incident criteria are essential. While politicians and water companies have claimed to be reducing pollution incidences, they might not strictly be tackling sources of pollution, so communications must be carefully scrutinised for disinformation.

The UK’s environment minister Steve Reed MP has described the water industry as “broken”. The public have rising water bills. Water companies owe over £60 billion in debts and have left the country with uncertain water security in the face of climate change.

The Environment Agency (EA) in England recently announced that serious pollution incidents in 2024 rose by 60% to 75 from 47 in the previous year. The EA classifies pollution incidents using a four-point scale called the common incident classification scheme. Trained EA officers consider the evidence reported via their incident hotline to assess its credibility and severity.

Category 1 is for major incidents, 2 for significant, 3 for minor incidents and 4 for no impact. Category 1 and 2 typically involve visible signs of dead fish floating. For salmon, if more than 10 adult or 100 young fish are dead, this is category 1. With fewer than ten adult and 100 young fish dead, it’s category 2.

No dead fish, no serious problem? The EA can also record damage on protected habitats as “pollution incidents” but these are harder to substantiate without investigative research that takes time and money.

Last year, more than 450,000 sewage discharges were recorded by event duration monitors. These are devices fitted to the end of overflow pipes that indicate when and for how long they have been discharging.

These discharges represent 3.6 million hours of untreated sewage going into our rivers and coasts. These contain chemical contaminants including pharmaceuticals, detergents and human pathogens. Only 75 incidents were recorded as serious or significant in 2024. Another 2,726 were classed as minor.

So lots of sewage discharges are not being classified as pollution incidents, despite containing pollutants. The EA advises its investigating officers to “record substantiated incidents that result in no environmental impact, or where the impact cannot be confirmed, as a category 4”.

The EA has been criticised for turning up late to 74% of category 1 and 2 pollution incidents and for being pressured to ignore low-level pollution – all claims that they have denied. However, they admit they are constrained by finances. Any new regulator must be adequately resourced and independent.

pollution from pipe out into environment — Pollution isn’t always classified as an official pollution incident.
YueStock/Shutterstock

In their recent report into pollution incidences, the EA states that they respond to all category 1 and 2 (serious and significant) water industry incidents and will be increasing their attendance at category 3 (minor) incidents. They highlight that more inspections will identify more issues. This shows some acceptance that the more incidents they attend, the more would be substantiated or recorded appropriately.

Most sewage discharges would not have been reported to, or recorded by, the EA as pollution incidents because they were permitted discharges from combined stormwater overflows. Water companies are allowed to discharge untreated wastewater under exceptional rainfall or snowfall conditions to prevent sewage backing up through the pipes.

Extra water flow in rivers from rainfall is meant to dilute chemical contaminants in wastewater. However, some discharges can last days or weeks. The EA is currently investigating whether water companies have been breaching their permits and discharging untreated wastewater when there is low or even no rainfall.

What counts as pollution?

The UN classifies pollution as “presence of substances and energy (for example, light and heat) in environmental media (air, water, land) whose nature, location, or quantity produces undesirable environmental effects”. This definition differs markedly from the EA’s working definition of pollution incidents.

Many sewage discharges containing low concentrations of pollutants won’t kill fish but might still be harmful to fish larvae or small insects, for example.

However, the broad picture from EA data is that invertebrate communities at least are in a better state than they were three decades ago before wastewater treatment plants were upgraded following the EU’s Urban Wastewater Directive.

Some pollutants bioaccumulate through the food chain, so they become concentrated in top predators such as orcas. Some chemicals mimic reproductive hormones even in low concentrations and can feminise fish, for example. High levels of nutrients from agriculture and sewage in rivers can cause fungal diseases in seagrass meadows.

Other families of chemicals build up in wildlife and people, such as persistent “forever chemicals”, much of which comes from wastewater discharges. Continued discharges of antibiotics into waterways might not be classified as pollution incidents but still pose a substantial risk to human and ecosystem health through bacteria developing antibiotic resistance.

The government has just committed to cut sewage pollution by 50% by December 2029 based on 2024 data. But it’s not yet clear whether these involve cutting the frequency of discharges, the duration or both.

This data could also be manipulated so that a large number of small discharges can be consolidated into one official discharge event. Currently, the volume of discharges from stormwater overflows isn’t known. Without this vital data we can’t ascertain the risk posed by their contaminants.

Alex Ford receives funding from the Natural Environment Research Council (NERC), EU, charities and industry including water companies.

– ref. No wonder England’s water needs cleaning up – most sewage discharges aren’t even classified as pollution incidents – https://theconversation.com/no-wonder-englands-water-needs-cleaning-up-most-sewage-discharges-arent-even-classified-as-pollution-incidents-261502

July 22, 2025

What was the Battle of Orgreave, and why has the government launched an inquiry into it?

Source: The Conversation – UK – By Steven Daniels, Lecturer in Politics, Edge Hill University

The UK’s home secretary, Yvette Cooper, has announced a full inquiry into the Battle of Orgreave, a large, violent clash between the National Union of Mineworkers and South Yorkshire police that took place over 40 years ago.

The clash was a flashpoint of the 1984-85 miners’ strike, in which mining communities fought to protect jobs and industry from closure. It descended into a violent confrontation between miners and police, with injuries and accusations of misconduct on both sides.

The announcement of an inquiry has been a long time coming for miners’ groups. Comparisons have been made to the Hillsborough tragedy and inquiry – another incident involving accusations of mistreatment by South Yorkshire Police.

The Battle of Orgreave took place on June 18 1984, outside Orgreave coking plant in Rotherham. The miners’ strike had been raging since March 1984, with both sides looking for opportunities to turn the tide in their favour.

Before ascending to the presidency of the National Union of Mineworkers (NUM) in 1982, British trade unionist Arthur Scargill had gained notoriety during the 1972 miners’ strike. He developed the “flying pickets” tactic. This approach saw large numbers of strikers from around the country descend on an industrially sensitive target, to pressure it into closing. These tactics successfully closed Saltley Gate gasworks in Birmingham, forcing the taxpayer-owned National Coal Board and Edward Heath’s government to concede the 1972 strike to the NUM.

In 1984, realising that British Steel’s furnaces would be vulnerable without coking coal, Scargill planned to repeat the 1972 victory at Orgreave.

On June 18, around 8,000 miners began assembling as early as 4am. They were met by 6,000 police in full riot gear. As lorries began arriving to collect coking coal, the conflict began around 8am. This unfolded in waves: mounted police would cavalry charge miners, splitting their lines, with “snatch squads” then swarming miners who had failed to retreat in time, arresting them.

This continued until the afternoon, when miners retreated into Orgreave village. Police continued trying to disperse miners, even cavalry-charging the village.

Miners’ groups allege that the police charged their lines despite their picket being peaceful in nature, and there was no trigger for violence. They claim only once police started charging did they retaliate in defence, throwing rocks and other missiles. Controversially, footage of these incidents was allegedly shown in reverse order by the BBC, painting the strikers as the aggressors.

Orgreave is considered a turning point, both in the strike, and in policing of protest. With the “flying pickets” strategy in tatters, the NUM struggled to maintain pressure and lost momentum as the months dragged on. The strike ended in March 1985 with a full, unconditional return to work.

The aftermath

Ninety-five miners were arrested that day, with 55 subsequently charged with riot. This was a serious charge, carrying the maximum penalty of life imprisonment. Many more reported injuries and accused South Yorkshire Police of being unnecessarily violent and heavy handed.

One of the most famous images from the day shows Lesley Boulton, a woman there to document the strike with her camera, with a mounted policeman swinging his truncheon at her head. This photo sums up the brutality of the day. Accusations also emerged of police removing their collar numbers, so as not to be identified.

Sensationally, the 1985 trial for riot collapsed after evidence from South Yorkshire Police was found to be unreliable. It was later revealed through archival material that officers were given direction or guidance in their statements.

It was also revealed that Margaret Thatcher herself attended a drinks reception for police chiefs involved in the strike, thanking them personally for “all they did and their forces did to maintain public order”. Even though the 55 miners were cleared of the charges, many were financially ruined, and unable to return to the coal industry.

Thirty-nine of those involved subsequently took legal action against South Yorkshire Police for unlawful arrest and malicious prosecution, settling for a payment of £425,000 and no admission of liability. Not a single police officer was prosecuted or punished for their role in Orgreave.

Calls for inquiry

Calls for an inquiry into the Battle of Orgreave, as well as the general standard of policing during the strike, have been ongoing for decades. As early as January 1985 (with the strike ongoing), the then home secretary, Leon Brittan, was resistant to any public inquiry into the conduct of police officers during the strike, fearing it would descend into a “witch-hunt”. John Major’s government similarly resisted such calls in 1991, believing them unnecessary.

In 2015, the Independent Police Complaints Commission declined to mount a formal investigation, despite finding evidence to suggest officers had indeed assaulted miners at Orgreave and other forms of misconduct. The commission argued that too much time had passed for the investigation to have any meaning.

Theresa May’s government rejected calls for an inquiry in 2016. The then home secretary Amber Rudd claimed an inquiry was not in the public interest, arguing policing standards had changed substantially since the 1980s and that the event had simply occurred too long ago. Rudd also said that many involved in the strike would have died, and most officers involved would no longer be employed by South Yorkshire Police.

The volunteer-run Orgreave Truth and Justice Campaign has long campaigned for a public inquiry, arguing that Orgreave was a serious miscarriage of justice that needs to be adequately addressed. They believe that a full inquiry will provide accountability and clarity regarding the role of the police and the state in such a tumultuous time period.

The Hillsborough inquiry shows what successful (and persistent) community action can achieve. Accusations made against South Yorkshire Police then were eventually proven correct. While there has yet to be any significantly successful legal action taken against officers involved in Hillsborough, the inquiry itself brought closure (and, crucially, the truth) to families involved. Mining communities will be hoping for similar closure with the Orgreave inquiry.

Steven Daniels consulted the Orgreave Truth and Justice Campaign on archival findings from his wider research in 2017.

– ref. What was the Battle of Orgreave, and why has the government launched an inquiry into it? – https://theconversation.com/what-was-the-battle-of-orgreave-and-why-has-the-government-launched-an-inquiry-into-it-261596

July 22, 2025

Is today’s political climate making dating harder for young people?

Source: The Conversation – UK – By Katherine Twamley, Professor of Sociology, UCL

The last year has highlighted a political divide between young men and women. Data from elections in several countries shows that women aged 18-29 are becoming significantly more liberal, while young men are leaning more conservative. And a recent 30-country study found generation Z more divided than other generations on key questions around gender equality.

At the same time, there is growing evidence that this cohort is turning away from traditional dating and long-term romantic relationships. According to the National Survey of Family Growth, in the US between 2022 and 2023, 24% of men and 13% of women aged 22-34 reported no sexual activity in the past year.

This is a significant increase on previous years. And American teens are less likely to have romantic relationships than teenagers of previous generations.

In the UK, surveys over the past decades reveal a trend in reduced sexual activity, in terms of both frequency and number of partners, among young people. Dating apps are also losing their lustre, with the top platforms seeing significant user declines among heterosexual gen Z users in the last year.

Is the gendered political divide making dating harder? As sociologists of intimacy, our work has shown how relationships are affected by larger social, economic and political trends.

Our research on enduring gender inequality has shown that it can affect the perceived quality of intimate relationships and relationship stability. For example, heterosexual relationships are often underpinned by unequal divisions of emotional and domestic labour, even among partners with similar incomes.

Dating today can feel like a mix of endless swipes, red flags and shifting expectations. From decoding mixed signals to balancing independence with intimacy, relationships in your 20s and 30s come with unique challenges. Love IRL is the latest series from Quarter Life that explores it all.

These research-backed articles break down the complexities of modern love to help you build meaningful connections, no matter your relationship status.

Some commentators and researchers have identified a trend of “heteropessimism” — a disillusionment with heterosexual relationships, often marked by irony, detachment or frustration. Anecdotally, women have widely expressed weariness with the gender inequality that can emerge in relationships with men.

But heteropessimism has been identified among men too, and research has found that women are, on average, happier being single than men.

Take domestic labour. Despite progress towards gender equality in many areas, data shows that women in mixed sex relationships still shoulder the majority of housework and care. In the UK, women carry out an average of 60% more unpaid work than men. This gap persists even among couples who both work full-time.

In Korea, persistent gender inequality is thought to be behind the 4B movement. Young Korean women, fed up with sexist stereotypes which tie women to traditional roles, have declared their rejection of marriage, childbirth, dating and sex with men.

Beyond Korea, young women have declared themselves “boy sober”. Harassment, abuse and “toxic behaviour” on dating apps has reportedly driven young women away from wanting to date at all.

Others have embraced voluntary celibacy. One reason is that, for some women, the erosion of reproductive rights, such as the overturning of Roe v Wade in the US, sharpens the political stakes of intimacy. Political disagreements that may once have been surmountable in a relationship are now deeply personal, affecting womens’ bodily autonomy and experiences of misogyny.

Of course, gender inequality does not just negatively affect women. In education, evidence suggests boys are falling behind girls at every level in the UK, though recent research shows this has reversed in maths and science. Men report feeling locked out of opportunities to care for their children through old-fashioned parental leave norms, which offer minimal opportunities for fathers to spend time with their children.

Some influencers capitalise on real and perceived losses for men, pushing regressive and sexist views of women and relationships into the social media feeds of millions of boys and young men.

Given all of the above, it is not entirely surprising that young men are more likely than young women to report that feminism has done more harm than good.

Anxiety and uncertainty

But there are wider political and economic issues that affect both young men and women, and how (or whether) they date each other. Gen Z are coming of age in a time of economic depression. Research shows that those experiencing financial stress have difficulties in establishing and maintaining intimate relationships.

This may partly be because early stages of romance are strongly associated with consumerism – dinner out, gifts and so on. But there is also a lack of mental space for dating when people are under pressure to make ends meet. Insecure finances also affect young people’s ability to afford their own homes and have access to private spaces with a partner.

There are, additionally, growing rates of mental ill health reported by young people worldwide. Anxieties abound around the pandemic, economic recession, the climate and international conflict.

These anxieties play out in the dating scene, with some feeling that entering into a romantic relationship is another risk to be avoided. Research with UK-based heterosexual dating app users aged 18-25 found that they often saw dating as a psychological stand-off – where expressing care too soon could result in humiliation or rejection.

Cartoonish illustration of a man holding a mobile phone, which shows a woman running away through an open door — Be vulnerable and risk rejection, or jump ship?
Dedraw Studio/Shutterstock

The result was that neither young men nor women felt safe expressing genuine interest. This left people stuck in the much-lamented “talking stage”, where relationships fail to progress.

As sociologist Lisa Wade and others have shown, even when casual sex is part of the picture, emotional attachment is often actively resisted. The proliferation of “hook-up culture” – characterised by casual sexual encounters that prioritise physical pleasure over emotional intimacy – may partly be a response to a cultural discomfort with vulnerability.

Gen Z’s turn away from dating doesn’t necessarily reflect a lack of desire for connection, but perhaps a heightened sense of vulnerability related to larger trends in mental ill-health and social, economic and political insecurity.

It may not be that young people are rejecting relationships. Rather, they may be struggling to find emotionally safe (and affordable) spaces where intimacy can develop.

The authors do not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

– ref. Is today’s political climate making dating harder for young people? – https://theconversation.com/is-todays-political-climate-making-dating-harder-for-young-people-257844

July 22, 2025

Floating babies, cosmic radiation and zero-gravity birth: what space pregnancy might actually involve

Source: The Conversation – UK – By Arun Vivian Holden, Emeritus Professor of Computational Biology, University of Leeds

As plans for missions to Mars accelerate, so do questions about how the human body might cope. A return trip to the red planet would give more than enough time for someone to become pregnant and even give birth. But could a pregnancy be conceived and carried safely in space? And what would happen to a baby born far from Earth?

Most of us rarely consider the risks we survived before birth. For instance, about two thirds of human embryos do not live long enough to be born, with most losses happening in the first few weeks after fertilisation; often before a person even knows they’re pregnant. These early, unnoticed losses usually happen when an embryo either fails to develop properly or to implant successfully in the wall of the womb.

Pregnancy can be understood as a chain of biological milestones. Each one must happen in the right order and each has a certain chance of success. On Earth, these odds can be estimated using clinical research and biological models. My latest research explores how these same stages might be affected by the extreme conditions of interplanetary space.

Microgravity, the near-weightlessness experienced during spaceflight, would make conception more physically awkward but probably wouldn’t interfere much with staying pregnant once the embryo has implanted.

However, giving birth, and looking after a newborn, would be far more difficult in zero gravity. After all, in space, nothing stays still. Fluids float. So do people. That makes delivering a baby and caring for one a much messier and more complicated process than on Earth, where gravity helps with everything from positioning to feeding.

At the same time, the developing foetus already grows in something like microgravity. It floats in neutrally buoyant amniotic fluid inside the womb, cushioned and suspended. In fact, astronauts train for spacewalks in water tanks designed to mimic weightlessness. In that sense, the womb is already a microgravity simulator.

But gravity is only part of the picture.

Radiation

Outside Earth’s protective layers, there’s a more dangerous threat: cosmic rays. These are high-energy particles – “stripped-down” or “bare” atomic nuclei – that race through space at nearly the speed of light. They’re atoms that have lost all their electrons, leaving just the dense core of protons and neutrons. When these bare nuclei collide with the human body, they can cause serious cellular damage.

Here on Earth, we’re protected from most cosmic radiation by the planet’s thick atmosphere and, depending on the time of day, tens of thousands to millions of miles of coverage from the Earth’s magnetic field. In space, that shielding disappears.

When a cosmic ray passes through the human body, it may strike an atom, strip its electrons, and smash into its nucleus, knocking out protons and neutrons and leaving behind a different element or isotope. This can cause extremely localised damage – meaning that individual cells, or parts of cells, are destroyed while the rest of the body might remain unaffected. Sometimes the ray passes right through without hitting anything. But if it hits DNA, it can cause mutations that increase the risk of cancer.

Even when cells survive, radiation can trigger inflammatory responses. That means the immune system overreacts, releasing chemicals that can damage healthy tissue and disrupt organ function.

In the first few weeks of pregnancy, embryonic cells are rapidly dividing, moving, and forming early tissues and structures. For development to continue, the embryo must stay viable throughout this delicate process. The first month after fertilisation is the most vulnerable time.

A single hit from a high-energy cosmic ray at this stage could be lethal to the embryo. However, the embryo is very small – and cosmic rays, while dangerous, are relatively rare. So a direct hit is unlikely. If it did happen, it would probably result in an unnoticed miscarriage.

Pregnancy risks

As pregnancy progresses, the risks shift. Once the placental circulation – the blood flow system that connects mother and foetus – is fully formed by the end of the first trimester, the foetus and uterus grow rapidly.

That growth presents a larger target. A cosmic ray is now more likely to hit the uterine muscle, which could trigger contractions and potentially cause premature labour. And although neonatal intensive care has improved dramatically, the earlier a baby is born, the higher the risk of complications, particularly in space.

On Earth, pregnancy and childbirth already carry risks. In space, those risks are magnified – but not necessarily prohibitive.

But development doesn’t stop at birth. A baby born in space would continue growing in microgravity, which could interfere with postural reflexes and coordination. These are the instincts that help a baby learn to lift its head, sit up, crawl, and eventually walk: all movements that rely on gravity. Without that sense of “up” and “down,” these abilities might develop in very different ways.

And the radiation risk doesn’t go away. A baby’s brain continues to grow after birth, and prolonged exposure to cosmic rays could cause permanent damage – potentially affecting cognition, memory, behaviour and long-term health.

So, could a baby be born in space?

In theory, yes. But until we can protect embryos from radiation, prevent premature birth, and ensure babies can grow safely in microgravity, space pregnancy remains a high-risk experiment – one we’re not yet ready to try.

Arun Vivian Holden 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. Floating babies, cosmic radiation and zero-gravity birth: what space pregnancy might actually involve – https://theconversation.com/floating-babies-cosmic-radiation-and-zero-gravity-birth-what-space-pregnancy-might-actually-involve-261142

July 22, 2025

Learning statistics through story: students get creative with numbers

Source: The Conversation – Africa – By Johan Ferreira, Professor, University of the Witwatersrand

Statistics professor Johan Ferreira was feeling overwhelmed by the amount of “screen time” involved in online learning in 2021. He imagined students must be feeling the same way, and wondered what he could do to inspire them and make his subject matter more appealing.

One of the topics in statistics is time series analysis: statistical methods to understand trend behaviour in data which is measured over time. There are lots of examples in daily life, from rainfall records to changes in commodity prices, import or exports, or temperature.

Ferreira asked his students to write a short, fictional “bedtime” story using “characters” from time series analysis. The results were collected into a book that is freely available. He tells us more about it.

Why use storytelling to learn about statistics?

I’m fortunate to be something of a creative myself, being a professional oboe player with the Johannesburg Philharmonic Orchestra. It’s a valuable outlet for self-expression. I reflected on what other activity could inspire creativity without compromising the essence of statistical thinking that was required in this particular course I was teaching.

I invited my third-year science and commerce students at the University of Pretoria to take part in a voluntary storytelling exercise, using key concepts in time series analysis as characters. Students got some guidelines but were free to be creative. My colleague and co-editor, Dr Seite Makgai, and I then read, commented on and edited the stories and put them together into an anthology.

Students gave their consent that their stories could be used for research purposes and might be published. Out of a class of over 200 students, over 30 contributions were received; 23 students permitted their work to be included in this volume.

We curated submissions into two sections (Part I: Fables and Fairy Tales and Part II: Fantasy and Sci-Fi) based on the general style and gist of the work.

The project aimed to develop a new teaching resource, inspire students to take ownership of their learning in a creative way, and support them through informal, project-based peer learning.

This collection is written by students, for students. They used personal and cultural contexts relevant to their background and environment to create content that has a solid background in their direct academic interests. And the stories are available without a paywall!

What are some of the characters and stories?

Student Lebogang Malebati wrote Stationaryville and the Two Brothers, a tale about AR(1) and AR(2). In statistics, AR refers to processes in which numerical values are based on past values. The brothers “were both born with special powers, powers that could make them stationary…” and could trick an evil wizard.

David Dodkins wrote Zt and the Shadow-spawn. In this story, Zt (common notation in time series analysis) has a magic amulet that reveals his character growth through a sequence of models and shows the hero’s victory in the face of adversity. He is a function of those that came before him (through an AR process).

Then there’s Nelis Daniels’ story about a shepherd plagued by a wolf called Arma (autoregressive moving average) which kept making sheep disappear.

And Dikelede Rose Motseleng’s modern fable about the love-hate relationship between AR(1) (“more of a linear guy” with a bad habit of predicting the future based on the past) and MA(1), “the type of girl who would always provide you with stationarity (stability).”

What was the impact of the project?

It was a deeply enriching experience for us to see how students see statistics in a context beyond that of the classroom, especially in cases where students reformulated their stories within their own cultural identities or niche interests.

Three particular main impacts stand out for us:

students have a new additional reference and learning resource for the course content
new students can refer to the experiences and contextualisation of this content of former students, leading to informal peer learning
students engage in a cognitive skill (higher-order and creative thinking) that is not frequently considered and included in this field and at this level.

In 2024, shortly after the book was published, we asked students in the time series analysis course of that year to read any one of four stories (related to concepts that were already covered in the course material at that point in time). We asked them to complete a short and informal survey to gauge their experience and insights regarding the potential of this book as a learning resource for them.

The 53 responses we got indicated that most students saw the book as a useful contribution to their learning experience in time series analysis.

One positive comment from a student was:

I will always remember that the Random Walk is indeed not stationary but White Noise is. I already knew it, but now I won’t forget it.

Will you build on this in future?

It is definitely valuable to consider similar projects in other branches of statistics, but also, in other disciplines entirely, to develop content by students, for students.

At this stage, we’re having the stories and book translated into languages beyond English. In large classes that are essential to data science (such as statistics and mathematics), many different home languages may be spoken. Students often have to learn in their second, third, or even fourth language. So, this project is proving valuable in making advanced statistical concepts tactile and “at home” via translations.

Our publisher recently let us know that the Setswana translation is complete, with the Sepedi and Afrikaans translations following soon. To our knowledge, it’ll be the first such project not only in the discipline of statistics, but in four of the official languages in South Africa.

Johan Ferreira receives funding from the Centre of Excellence in Mathematical and Statistical Sciences, based at the University of the Witwatersrand, towards this Scholarship of Learning and Teaching project.

– ref. Learning statistics through story: students get creative with numbers – https://theconversation.com/learning-statistics-through-story-students-get-creative-with-numbers-261198

July 22, 2025

Livestock and lions make uneasy neighbours: how a fence upgrade helped protect domestic and wild animals in Tanzania

Source: The Conversation – Africa (2) – By Jonathan Salerno, Associate Professor, Colorado State University, Colorado State University

Protecting livestock in areas where large carnivores (like lions) live is increasingly important as human land use expands, wildlife habitat shrinks, and climatic changes reshape the ways in which humans and wildlife interact. Protecting the carnivores from livestock owners is important too. Intact carnivore populations support more resilient food webs and the ecosystem services they provide.

It’s not easy for people, livestock, and carnivores to live together without conflict, though. One of the best ways to reduce conflict is to protect livestock like cattle and sheep from being attacked by predators.

There are various methods to do this, like guarding livestock or erecting fences. That’s all very well for the livestock inside the fences, but do predators simply turn to the nearest unprotected livestock for their meal instead? Are the neighbours’ cattle, sheep, and goats at greater risk? This question hasn’t been explored much by researchers.

We’re a group of conservation practitioners and scientists who have studied the interactions of carnivores, livestock, and people in Tanzania and elsewhere for decades to try and find solutions to conflict problems.

Our study area is next to a national park which protects important populations of lion, leopard, hyena, African wild dog, and cheetah. The people who live here have traditionally kept their livestock overnight in enclosures made of acacia-thorn branches. More recently, some of them have built pens, or corrals, from tall chain link fencing. We knew from years working with communities and from previous research that these fortified corrals were effective at keeping livestock safe from predators.

Our next step was to find out whether this made other nearby livestock less safe.

The results were intriguing. We found that the new enclosures made predation less likely in the nearby traditional enclosures too.

This type of beneficial spillover effect had yet to be documented in other systems where interventions aim to protect livestock from large carnivores.

Our results show that in conservation, it’s important to look closely at complex local dynamics. The findings may help explain why there’s so much uncertainty about the effectiveness of various human–wildlife conflict mitigation strategies.

Beneficial spillover effects

People who keep livestock in east Africa have long had strategies to keep their animals safe from large carnivores. Sometimes acacia-thorn night enclosures (known locally as bomas), intensive herding practices, and guarding dogs work well.

Other times, and especially in communities within and adjacent to large, protected carnivore populations, traditional strategies fall short.

This is the case in Tanzania’s Ruaha-Rungwa Landscape. In our study area adjacent to Ruaha National Park, any pastoralist or agropastoralist (herding and crop farming) household has about a 30% chance of losing one or more animals to predation each year. This is a serious economic loss on top of important cultural and emotional costs.

Lion Landscapes, an organisation that some of us have been running for over a decade, works to support human-carnivore coexistence. Adjacent to Ruaha, we have been partnering with households to build 1.8-metre chain-link corrals. We subsidise them. Households contribute 25% of the cost and some of the labour for construction.

We analysed about 25,000 monthly reports of livestock predation in fenced and traditional enclosures, using statistical models. There were 846 predation events over nearly four years. Unexpectedly, while we did detect spillover effects, these appeared to be beneficial. Rather than displacing conflicts, fortified enclosures actually conferred protective effects on their traditional-enclosure neighbours.

For example, households within 50 metres (the minimum observed distance) of a fortified enclosure were half as likely to experience predation compared with distant households 2 kilometres away. And these beneficial effects increased with the number of fortified enclosures in a neighbourhood. Finally, the effects appeared to be durable over time.

The fortified enclosures were extremely effective. We showed that households could break even after paying for the fence in just a few years through avoided livestock losses. And we know that when domestic animals aren’t being killed, their owners are more tolerant of predators. We didn’t record carnivore killings in this study but it has happened fairly frequently in the area in the past.

In a few of the world’s human-wildlife conflict systems, where data exist to assess spillover effects, there is evidence that detrimental spillovers do occur. For instance, beehive deterrents may redirect elephants to nearby crop fields, or lethal removal of individual wolves may redirect the surviving pack to prey on adjacent ranches. Nevertheless, these are very under-studied interactions.

Livestock management and carnivore coexistence

In systems where humans, livestock, and wildlife overlap and sometimes come into conflict, management strategies too often focus on wildlife. Another option is to reduce whatever attracts wildlife. In the case of large carnivores, this means managing livestock.

Our results support this approach by demonstrating that management and protection of livestock is fundamental for reducing conflict, and can benefit not only livestock owners but landscape-level coexistence.

Conservationists and policy-makers need to encourage these practices that benefit people, carnivores, and livestock in shared landscapes.

Amy Dickman works for Lion Landscapes as the Joint CEO

Jonathan Salerno, Kevin Crooks, Rekha Warrier, and Stewart Breck do not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

– ref. Livestock and lions make uneasy neighbours: how a fence upgrade helped protect domestic and wild animals in Tanzania – https://theconversation.com/livestock-and-lions-make-uneasy-neighbours-how-a-fence-upgrade-helped-protect-domestic-and-wild-animals-in-tanzania-258113

July 22, 2025

Ghana’s security strategy has kept terror attacks at bay: what other countries can learn from its approach

Source: The Conversation – Africa (2) – By Paa Kwesi Wolseley Prah, Postdoctoral Fellow, Dublin City University

Ghana stands out in west Africa as a nation that has not experienced terrorist attacks, even though it’s geographically close to countries that have. In Burkina Faso, Mali and Nigeria, extremist groups such as Boko Haram and Islamic State in West Africa (ISWAP) have wreaked havoc.

This resilience is not accidental. It is the result of deliberate counter-terrorism strategies employed by Ghana’s security institutions.

Ghana’s counter-terrorism framework was set out in 2020. It has four pillars: prevent, pre-empt, protect, and respond. The idea is to coordinate multiple agencies, including the Ghana Police Service, Ghana Immigration Service, Ghana Armed Forces and the National Intelligence Bureau.

These pillars guide strategies to address both immediate threats and underlying vulnerabilities. Poverty, religious radicalism and porous borders are common drivers of terrorism in west Africa.

I am an international security and global governance researcher. My co-author is a government and international studies scholar.

Four years ago we wrote a paper examining Ghana’s resilience against terrorist attacks. Our findings are still relevant given the increasing activities of terror groups in the west African region.

We wanted to identify what works as a potential model for other countries.

Using a qualitative methodology, we interviewed stakeholders — including police officers, members of the armed forces, Muslim community leaders, and immigration officials. We also analysed the national framework for preventing and countering violent extremism and terrorism.

Our findings showed that Ghana’s success is traceable to an approach that integrates community engagement with advanced border technology, inter-agency training, media collaboration and intelligence operations. And it addresses both immediate and underlying threats.

We argue that Ghana’s ability to balance prevention with security offers solutions for stability in a geopolitically volatile region.

Community engagement

One of the standout strategies is community engagement. This serves multiple purposes, from guiding people away from extremism to gathering intelligence.

The Ghana Police Service, for instance, engages Muslim-dominated communities, known as “Zongos”, to counter radical Islamic ideologies that could be exploited by terrorist groups.

By collaborating with local religious leaders, police make communities aware of the dangers of radicalisation. They foster trust and encourage residents to report suspicious activities. This approach also works in tackling illegal arms circulation.

Ghana has an estimated 2.3 million small arms in circulation – 1.1 million of them illegally possessed. The availability of so many weapons fuels terrorist activities across west Africa.

Community based de-radicalisation aligns with global best practices. In Norway, for instance, it was used to disengage youth from extremist groups.

Technology at borders

Ghana’s border control management is another part of its counter-terrorism strategy. Ghana Immigration Service uses advanced security software and integrated systems like the “Immigration 360” system, designed to fully automate passenger processing and data management.

The system manages records of fingerprints and other data to improve reporting and intelligence sharing between Ghana Immigration and other security agencies.

The technology makes it possible to quickly identity individuals on terrorist watchlists and detects concealed goods. This helps prevent illegal cross-border movements.

There are gaps in Ghana’s defences, however. The influx of migrants fleeing extremist violence in Burkina Faso, Mali and Niger in 2024 highlights the urgency of scaling up investments in the technology.

Training for preparedness

Ghana combats new and varying forms of terrorism by uncovering trends and training personnel to deal with them.

A notable example was the six-day joint training in 2022 involving the Ghana Immigration Service, Police Service, Customs, Economic and Organised Crime Office, and the National Intelligence Bureau.

The country also works with regional neighbours like Burkina Faso, Togo and Benin, and partners such as the United States, through initiatives like “Operation Epic Guardian”.

Media as a strategic partner

Terrorists rely on media to amplify fear and publicise their causes. Ghana’s security agencies counter this tactic by actively engaging media houses to report accurately.

The Ghana Armed Forces, for instance, works with media to debunk false reports, which can cause public panic and inadvertently aid terrorists.

The Ghana Police Service emphasises regular dialogue with media to ensure sensitive information is verified before publication, reducing the risk of tipping off suspects. However, media competition for viewers poses a challenge.

Surveillance and intelligence gathering

Surveillance and intelligence gathering is critical. Plainclothes armed forces and immigration personnel blend into communities to monitor potential threats. The approach has worked but is constrained by resources.

It can also risk human rights violations, such as wrongful profiling, and is less effective against multiple targets compared to technological solutions like facial recognition or CCTV.

Challenges and regional implications

Despite its successes, Ghana’s counter-terrorism framework faces challenges that could undermine its long-term efficacy:

logistical and financial constraints
the influx of migrants fleeing regional violence
a lack of harmonised security cultures within the regional body, Ecowas.

In all, Ghana’s strategies offer lessons for west Africa, where terrorism is a growing threat.

Its community engagement model could be followed in Nigeria, Burkina Faso, Mali and Niger to counter radicalisation and arms proliferation, provided it avoids religious stereotyping.

– ref. Ghana’s security strategy has kept terror attacks at bay: what other countries can learn from its approach – https://theconversation.com/ghanas-security-strategy-has-kept-terror-attacks-at-bay-what-other-countries-can-learn-from-its-approach-260333

July 22, 2025

I research rip currents where ‘Cosby Show’ star Malcolm-Jamal Warner drowned. Here’s why they’re so deadly

Source: The Conversation – Canada – By Chris Houser, Professor in Department of Earth and Environmental Science, and Dean of Science, University of Waterloo

Malcolm-Jamal Warner, the actor who played Theo Huxtable on The Cosby Show, has drowned on Costa Rica’s Caribbean coast.

It is reported that he was swimming at Playa Cocles in Limon province when a current pulled him offshore. This is a beach popular among surfers and one that’s known to have large waves and strong currents.

It’s also a beach that I have taken students to in order to study the formation of rip currents and to better understand what beach users know about the hazard.

What exactly are rip currents?

Rip currents — commonly referred to as rips or colloquially as rip tides — are found on ocean beaches and some large lakes around the world.

The rips at Playa Cocles and along a large part of the Costa Rican Caribbean coast are known as channel or bathymetric rips that form as the nearshore sand bar moves toward the land through the summer. The water thrown towards the land by the breaking waves returns offshore as a concentrated and fast flowing current at gaps in the nearshore sand bar.

During storm conditions, we have measured the rip currents at Playa Cocles at over two metres per second. These rips are known to increase rapidly (or pulse) in strength due to changes in wave breaking, leading to unsuspecting swimmers being taken far offshore and exiting beyond the zone of breaking waves.

Rip current at Playa Cocles showing change in size and strength with surfers for scale. (Chris Houser)

While it can be difficult to spot a rip from shore, they can be identified by an area of relatively calm water between breaking waves, a patch of darker water or the offshore flow of water, sediment and debris.

Caught in a rip current

A person caught in a rip is transported away from shore into deeper waters, but they aren’t pulled under the water. If they are a weak swimmer or try to fight the current, they may panic and fail to find a way out of the rip and back to shore. Survivor stories highlight panic, anxiety, distress and fear, a tendency to fight the current and an inability to make a decision on how to escape the rip.

While it is possible to “break the grip of the rip” by swimming parallel to the beach or toward breaking waves at an angle to the beach, there is no single escape strategy due to the unique rip circulation pattern.

It’s possible to escape a rip by flipping onto your back, floating to keep your head above the water and following the current until you’re returned to the shore by the current or able to swim safely toward the shore. If you are taken beyond where the waves break, or you’re unable to swim back to shore, continue to float and signal for help.

Rip currents account for more than 50 deaths a year in Costa Rica; approximately 19 drownings a year involve foreign tourists from the United States, Nicaragua, Canada and Germany. While most drownings in the country occur on Pacific coast beaches that are a short distance to the city of San José, more than five drownings occur each year along the Caribbean coast.

Playa Cocles was the site of five drownings that occurred over eight days in 2004, an event that prompted tourism-dependent business owners to establish a lifeguard station on the beach.

Costa Rican drownings

On average, each drowning in Costa Rica costs more than US$2 million (USD). This includes the direct costs of search and rescue, the costs of repatriation and the long-term economic burden of a lost life. This is in addition to the great personal loss experienced by family and friends.

A survey at Playa Cocles and other beaches in Costa Rica revealed that a majority of beach users did not observe warning signs and that many were unable to interpret the warning and did not change their behaviour.

The majority of foreign drowning victims in Costa Rica had limited knowledge of rips and were unable to avoid the times and locations that were most hazardous.

In general, visitors to a beach often use simple visual cues when deciding to take risks. Recent studies suggest that tourists think beach access points and resorts are located adjacent to safe swimming areas, particularly when visual cues such as manicured paths and promotional posters that promote swimming at those locations.

Visitors are a high-risk group for drownings. They’re generally unfamiliar with the beach and its safety measures and often have poor knowledge of beach hazards, such as rip currents and breaking waves. This lack of knowledge can be exacerbated by language barriers, an overconfidence in swimming ability and peer pressure.

Rip current and beach users at Playa Cocles. The red flag was placed by lifeguards to mark the location of the rip for beach users. (Chris Houser)

Playa Cocles is a beautiful beach, but it’s known to have dangerous rips depending on the size of the breaking waves and the position of the sand bar.

When visiting any beach — from the Caribbean to the Great Lakes — it’s important to remember that there may be rip currents and to take serious precautions.

Chris Houser receives funding from NSERC.

– ref. I research rip currents where ‘Cosby Show’ star Malcolm-Jamal Warner drowned. Here’s why they’re so deadly – https://theconversation.com/i-research-rip-currents-where-cosby-show-star-malcolm-jamal-warner-drowned-heres-why-theyre-so-deadly-261653