Largest ever Parkinson’s study shows how symptoms differ between men and women

Lyndsey Collins-Praino, Adelaide University

Parkinson’s disease is the fastest growing neurological disorder, with over 10 million cases worldwide. Up to 150,000 Australians currently live with the disease and 50 new cases are diagnosed each day.

The number of people living with Parkison’s is projected to more than triple between 2020 and 2050.

Yet despite the immense impact on those living with Parkinson’s and their loved ones, and the staggering cost to our economy – at least A$10 billion a year – there is still a lot we don’t know about how this disease presents and progresses.

A recent large-scale study of nearly 11,000 Australians living with Parkinson’s disease provides some critical insights into symptoms, risk factors and how these affect men and women differently. Let’s take a look.

First, what is Parkinson’s disease?

Parkinson’s is a progressive disease in which cells that produce the chemical messenger dopamine in a part of the brain called the “substantia nigra” begin to die. This is accompanied by multiple other brain changes.

It is usually considered a movement disorder. Common motor symptoms include a resting tremor, slowed movement (bradykinesia), muscle stiffness and balance issues.

But Parkinson’s also involves a variety of lesser known non-motor symptoms. These may include:

• mood changes
• difficulties with memory and cognition (including slower thinking, challenges with planning or multitasking and difficulty paying attention or concentrating)
• sleep disturbances
• autonomic dysfunction (such as constipation, low blood pressure and urinary problems).

While these are sometimes referred to as the “invisible” symptoms of Parkinson’s, they often have a greater negative impact on quality of life than motor symptoms.

So, what does the new research tell us?

The study used data collected as part of the Australian Parkinson’s Genetics Study led by the QIMR Berghofer Medical Research Institute. After a pilot study in 2020, it was launched as an ongoing, nationwide research project in 2022.

Some 10,929 Australians with Parkinson’s were surveyed and provided saliva samples for genetic analysis. This is the largest Parkinson’s cohort studied in Australia and the largest active cohort worldwide.

There were several key initial findings.

1. Non-motor symptoms are common

The study reinforced how common non-motor symptoms are, with loss of smell (52%), changes in memory (65%), pain (66%) and dizziness (66%) all commonly reported.

Notably, 96% of participants experienced sleep disturbances, such as insomnia and daytime sleepiness.

2. A better picture of risk factors

The study also provided insights into what can influence Parkinson’s risk.

This is important because we don’t completely understand what causes the dopamine producing cells in the substantia nigra to die in the first place.

Age is the primary risk factor for Parkinson’s. The new study found the average age for symptom onset was 64, and for diagnosis, 68.

3. Genes and environment both play a role

In the recent study, one in four people (25%) had a family history of Parkinson’s. But only 10–15% of Parkinson’s cases are caused by – or strongly linked to – mutations in specific genes.

It’s important to remember that families don’t only share genes but often their environment.

Multiple environmental factors, such as pesticide exposure and traumatic brain injury, also increase risk of Parkinson’s.

The majority (85–90%) of cases of Parkinson’s are likely due to complex interaction between genetic and environmental risk factors, and advancing age.

The study showed environmental exposures linked to Parkinson’s risk were common:

• 36% of people reported pesticide exposure
• 16% had a prior history of traumatic brain injury
• 33% had worked in high-risk occupations (such as agriculture, or petrochemicals or metal processing).

These exposures were significantly higher in men than in women.

4. Differences between the sexes

The disease is 1.5 times more common in men. In the new study, 63% of those surveyed were male.

Parkinson’s also presents and progresses differently in males and females.

The study found women were younger than men at time of symptom onset (63.7 versus 64.4 years) and diagnosis (67.6 versus 68.1 years), and more likely than men to experience pain (70% versus 63%) and falls (45% versus 41%).

Men experienced more memory changes than women (67% versus 61%) and impulsive behaviours, particularly sexual behaviour (56% versus 19%) – although most participants exhibited no or only mild impulsivity.

What we still don’t know

The large-scale study and its comprehensive survey shed valuable light on people living with Parkinson’s in Australia.

But it’s still only a sliver of the population. More than 186,000 people with Parkinson’s were invited to participate and just under 11,000 took part – a less than 6% response rate.

Of these participants, 93% had European ancestry. So this sample may not be fully representative of Parkinson’s disease.

The information we have about symptoms also relied on self-reports by the study’s participants, which are subjective and can be biased or less reliable than objective measurements of function. To address this, the researchers are planning to use smartphones and wearable devices to collect more comprehensive data.

Finally, while this provides a snapshot of the current cohort, it’s not clear how participants compare to people of a similar age without Parkinson’s, or how their symptoms may change over time.

These are important areas of future research for this ongoing study.

What all this means

Studies like this provide crucial insights into risk factors linked to Parkinson’s. They also help us better understand the symptoms people experience.

This is important because the way Parkinson’s presents varies from person to person. Not everyone will experience the same symptoms to the same extent.

Similarly, the way the disease progresses over time differs between people.

A better understanding of the factors that influence this can lead to earlier identification of who’s at risk and more personalised ways of managing this disease.

Lyndsey Collins-Praino, Associate Professor, School of Biomedicine, Adelaide University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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The Tiger Population Doubled in India in Just Ten Years

Panna Tiger Reserve

Conservation in India successfully doubled the native population of tigers in the decade before the COVID-19 pandemic, a new study reveals.

In 2010, the nations that make up the remaining range countries of the tiger set a target to double the number of wild tigers worldwide—a goal called Tx2—10 at the St. Petersburg International summit on tiger conservation.

The idea was that by 2022—the Year of the Tiger in the Chinese zodiac, the countries across the Indo-Pacific, East and South Asia, and Russia, would have enough time to effectively support tiger conservation.

By 2022, the objective was estimated to have been achieved when measured across the animal’s whole range, but within that achievement were several localized triumphs even more impressive—Nepal, but also India, had seen their native populations of tiger double.

Despite being the world’s most populous state, Indian governments were able to make room for tigers across 53,360 square miles. By 2018, India’s native tiger population clawed its way above 3,600. Along with being 75% of the world’s tiger population, it was twice as many as the best estimates guessed in 2006.

Published in a study in Science recently, extensive monitoring of the big cat across 20 Indian states every 4 years revealed this increase in the number of tigers, but also the amount of protected-tiger habitat.

As well as there being twice as many tigers since 2006, there is 30% more habitat where they live. The study presents findings that tigers do better in areas of higher economic development where locals and visitors can afford tiger-tourism and governments compensate for tiger-related losses. In contrast, poorer states see increases of human-tiger conflict that make it difficult for the world’s largest cat to endure.

Sharing land with the growing Indian population is increasingly difficult for both man and tiger, but conflict isn’t as common as you might think.

“We lose 35 people to tiger attacks every year, 150 to leopards, and the same number to wild pigs. Additionally, 50,000 people die from snake bites,” Yadvendradev Vikramsinh Jhala, the study’s lead author, told the BBC. “In fact, within tiger reserves, you’re more likely to die from a car accident than from a tiger attack.”

The WWF, which was very involved with the Tx2 goal, published an article late last year entitled “5 reasons for hope for Tigers in 2025, detailing how the cats were spreading naturally into the forests of northern Thailand, northeast China, and northern Myanmar, as well as the extensive preparations made by Kazakhstan for the reintroduction of the tiger in the south of that country where it has been extinct for over a century.They didn’t include that camera traps in Sumatra recently recorded 3-times as many sightings of the Sumatran tiger subspecies than ever before. The Tiger Population Doubled in India in Just Ten Years

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7.1 million cancer cases worldwide preventable, tobacco biggest culprit: WHO

(Source: Xinhua/IANS)

New Delhi, (IANS) Up to four in 10 or 7.1 million cancer cases worldwide could be prevented, according to a new global analysis from the World Health Organization (WHO) and its International Agency for Research on Cancer (IARC) on Wednesday.

The study, released on World Cancer Day on February 4, identified tobacco as the leading preventable cause of cancer globally, responsible for 15 per cent of all new cancer cases.

It also found, for the first time, that nine cancer-causing infections are responsible for about 10 per cent of cancer cases.

Other reasons include alcohol, high body mass index, physical inactivity, air pollution, and ultraviolet radiation.

The analysis, based on data from 185 countries and 36 cancer types, estimated that 37 per cent of all new cancer cases in 2022, around 7.1 million cases, were linked to preventable causes.

Three cancer types - lung, stomach and cervical cancer- accounted for nearly half of all preventable cancer cases in both men and women, globally.

Lung cancer was primarily linked to smoking and air pollution, stomach cancer was largely attributable to Helicobacter pylori infection, and cervical cancer was overwhelmingly caused by human papillomavirus (HPV).

"This is the first global analysis to show how much cancer risk comes from causes we can prevent," said Dr Ilbawi, WHO Team Lead for Cancer Control, and author of the study.

"By examining patterns across countries and population groups, we can provide governments and individuals with more specific information to help prevent many cancer cases before they start," he added.

The burden of preventable cancer was substantially higher in men than in women, with 45 per cent of new cancer cases in men compared with 30 per cent in women.

In men, smoking accounted for an estimated 23 per cent of all new cancer cases, followed by infections at 9 per cent and alcohol at 4 per cent.

Among women globally, infections accounted for 11 per cent of all new cancer cases, followed by smoking at 6 per cent and high body mass index at 3 per cent, the report said.

The findings underscore the need for context-specific prevention strategies that include strong tobacco control measures, alcohol regulation, vaccination against cancer-causing infections such as human papillomavirus (HPV) and hepatitis B, improved air quality, safer workplaces, and healthier food and physical activity environments.Addressing preventable risk factors not only reduces cancer incidence but also lowers long-term health care costs and improves population health and well-being, the study said. 7.1 million cancer cases worldwide preventable, tobacco biggest culprit: WHO | MorungExpress | morungexpress.com

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Human heart regrows muscle cells after heart attack: Study

(Photo: AI generated image/IANS)

New Delhi, (IANS) In a world-first discovery, scientists in Australia have found that the human heart can regrow muscle cells after a heart attack, raising hopes for future regenerative treatments for heart failure.

The study, published in Circulation Research, revealed that while parts of the heart remain scarred after a heart attack, new muscle cells are also produced, a phenomenon previously seen only in mice and now demonstrated in humans for the first time, Xinhua news agency reported.

"Until now we've thought that, because heart cells die after a heart attack, those areas of the heart were irreparably damaged, leaving the heart less able to pump blood to the body's organs," said Robert Hume, research fellow at the University of Sydney and first author of the study.

"In time, we hope to develop therapies that can amplify the heart's natural ability to produce new cells and regenerate the heart after an attack," said Hume, also lead of translational research at Australia's Baird Institute for Applied Heart and Lung Research.

Though increased mitosis (a process in which cells divide and reproduce) after a heart attack has been observed in the heart muscles of mice, this is the first time the phenomenon has been demonstrated in humans.

The team made the breakthrough using living heart tissue samples collected from patients undergoing bypass surgery at Australia's Royal Prince Alfred Hospital.

"Ultimately, the goal is to use this discovery to make new heart cells that can reverse heart failure," said Professor Sean Lal, the study's senior author and heart failure cardiologist at the Royal Prince Alfred Hospital.Cardiovascular disease remains the world's leading cause of death, and heart attacks can eliminate a third of the cells in the human heart, researchers said, adding that the discovery offers promising groundwork for novel regenerative medicine. Human heart regrows muscle cells after heart attack: Study | MorungExpress | morungexpress.com

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63 pc of Indian enterprises believe Gen AI is important for sustainability efforts: Study

IANS Photo

Bengaluru, (IANS) About 63 per cent of Indian enterprises believe that generative AI will be important for their efforts towards sustainability, according to a new study on Tuesday.

The global study conducted by the IBM Institute for Business Value (IBV) is based on a survey of 5,000 C-suite executives across 22 industries and 22 countries.

It stresses the need for companies to embed sustainability into all facets of business operations, instead of just “treating it as an optional addition.”

The study revealed that 63 per cent of Indian business leaders agreed that generative AI is necessary to strive for sustainability, while 76 per cent said they plan to increase investment in generative AI for sustainability.

“In today's business world, sustainability has evolved from being optional to indispensable. With AI reshaping industries, integrating sustainability into core business practices add to the long-term value creation,” said Sandip Patel, Managing Director, IBM India, in a statement.

“The commitment of businesses to invest in Gen AI for sustainability signals a promising move towards a greener, more prosperous future,” he added.

Further, 78 per cent of Indian executives found that sustainability can help get better business, and 68 per cent agree that sustainability is key to their business strategy.

However, funding, skilling and operations were found as a challenge. While high-quality data and transparency (86 per cent) were touted as necessary to achieve sustainability outcomes, the lack of requisite skills was identified as the major hindrance to sustainability progress (44 per cent).“This study not only underscores the environmental responsibility of enterprises but also highlights their readiness to leverage cutting-edge technology for lasting impact and competitiveness,” Patel said. 63 pc of Indian enterprises believe Gen AI is important for sustainability efforts: Study | MorungExpress | morungexpress.com

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Can you wear the same pair of socks more than once?

Primrose Freestone, University of Leicester

It’s pretty normal to wear the same pair of jeans, a jumper or even a t-shirt more than once. But what about your socks?

If you knew what really lived in your socks after even one day of wearing, you might just think twice about doing it.

Our feet are home to a microscopic rainforest of bacteria and fungi – typically containing up to 1,000 different bacterial and fungal species. The foot also has a more diverse range of fungi living on it than any other region of the human body.

The foot skin also contains one of the highest amount of sweat glands in the human body.

Most foot bacteria and fungi prefer to live in the warm, moist areas between your toes where they dine on the nutrients within your sweat and dead skin cells. The waste products produced by these microbes are the reason why feet, socks and shoes can become smelly.

For instance, the bacteria Staphylococcal hominis produces an alcohol from the sweat it consumes that makes a rotten onion smell. Staphylococcus epidermis, on the other hand, produces a compound that has a cheese smell. Corynebacterium, another member of the foot microbiome, creates an acid which is described as having a goat-like smell.

The more our feet sweat, the more nutrients available for the foot’s bacteria to eat and the stronger the odour will be. As socks can trap sweat in, this creates an even more optimal environment for odour-producing bacteria. And, these bacteria can survive on fabric for months. For instance, bacteria can survive on cotton for up to 90 days. So if you re-wear unwashed socks, you’re only allowing more bacteria to grow and thrive.

The types of microbes resident in your socks don’t just include those that normally call the foot microbiome home. They also include microbes that come from the surrounding environment – such as your floors at home or in the gym or even the ground outside.

In a study which looked at the microbial content of clothing which had only been worn once, socks had the highest microbial count compared to other types of clothing. Socks had between 8-9 million bacteria per sample, while t-shirts only had around 83,000 bacteria per sample.

Species profiling of socks shows they harbour both harmless skin bacteria, as well as potential pathogens such as Aspergillus, Candida and Cryptococcus which can cause respiratory and gut infections.

The microbes living in your socks can also transfer to any surface they come in contact with – including your shoes, bed, couch or floor. This means dirty socks could spread the fungus which causes Athlete’s foot, a contagious infection that affects the skin on and around the toes.

This is why it’s especially key that those with Athlete’s foot don’t share socks or shoes with other people, and avoid walking in just their socks or barefoot in gym locker rooms or bathrooms.

What’s living in your socks also colonises your shoes. This is why you might not want to wear the same pair of shoes for too many days in a row, so any sweat has time to fully dry between wears and to prevent further bacterial growth and odours.

Foot hygiene

To cut down on smelly feet and reduce the number of bacteria growing on your feet and in your socks, it’s a good idea to avoid wearing socks or shoes that make the feet sweat.

Washing your feet twice daily may help reduce foot odour by inhibiting bacterial growth. Foot antiperspirants can also help, as these stop the sweat – thereby inhibiting bacterial growth.

It’s also possible to buy socks which are directly antimicrobial to the foot bacteria. Antimicrobial socks, which contain heavy metals such as silver or zinc, can kill the bacteria which cause foot odour. Bamboo socks allow more air flow, which means sweat more readily evaporates – making the environment less hospitable for odour-producing bacteria.

Antimicrobial socks might therefore be exempt from the single-use rule depending on their capacity to kill bacteria and fungi and prevent sweat accumulation.

But for those who wear socks that are made out of cotton, wool or synthetic fibres, it’s best to only wear them once to prevent smelly feet and avoid foot infections.

It’s also important to make sure you’re washing your socks properly between uses. If your feet aren’t unusually smelly, it’s fine to wash them in warm water that’s between 30-40°C with a mild detergent.

However, not all bacteria and fungi will be killed using this method. So to thoroughly sanitise socks, use an enzyme-containing detergent and wash at a temperature of 60°C. The enzymes help to detach microbes from the socks while the high temperature kills them.

If a low temperature wash is unavoidable then ironing the socks with a hot steam iron (which can reach temperatures of up to 180–220°C) is more than enough kill any residual bacteria and inactivate the spores of any fungi – including the one that causes Athlete’s foot.

Drying the socks outdoors is also a good idea as the UV radiation in sunlight is antimicrobial to most sock bacteria and fungi.

While socks might be a commonly re-worn clothing item, as a microbiologist I’d say it’s best you change your socks daily to keep feet fresh and clean.

Primrose Freestone, Senior Lecturer in Clinical Microbiology, University of Leicester

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Would Your Helmet Actually Protect You? VA Tech’s ‘Helmet Lab’ Is Testing Every Sport

VA Tech Helmet Lab staff testing a hockey helmet – credit, VA Tech Helmet Lab

In 2011, Steve Rowson and his fellow engineering students at Virginia Tech were asked by the Hokies equipment manager if they could test commercially-available football helmets to see which was the safest.

Obliging the man, they ran a series of impact assessments, and found a broad spectrum of differences between them.

At that moment, the institute’s “Helmet Lab” was born, and Rowson would go on to become its director. Now, he’s training the next generation of students producing the VA Tech Helmet Rating with the aim of providing consumers the unbiased information needed to make informed decisions when purchasing helmets.

Now they test all kinds of helmets: cycling helmets, football helmets, snowsport helmets, construction site hard hats, baseball helmets, hockey helmets, and equestrian helmets.

“If you think about what we first started doing, it wasn’t an original thought. You can look back to the 1970s and see the suggestion of someone saying, ‘well, we should stick sensors inside football players’ helmets so we can study head impacts,'” Rowson told CNN’s Tech for Good series, interviewing him on the Helmet Lab’s origin story.

The project became popular with just about everybody. Manufacturers were keen to get the (could one say coveted?) 5-star Helmet Lab safety rating to increase sales, parents and athletes were keen to get the most protection for their dollar, and students had the opportunity to work and study a variety of scientific disciplines in a field with extremely practical implications: the reduction in brain trauma in sports and society at large.

It’s not as obvious as throwing a crash test dummy against a wall. The Helmet Lab pays close attention to the circumstances particular to each sport. In some cases, that means the head smacking into something, while in other cases it’s something smacking into the head.

A child riding a bike will on average hit the ground at different points on the helmet compared to an adult cyclist, in an example of this difference.

Surfaces and material matter too. A football player will need protection from helmet-to-helmet hits, while a hockey player needs both protection from hitting the ice and getting whacked with a wooden stick. Ice has a different impact potential than blacktop, which will be different to snow in the case of skiing helmets, which will be different to sand in the case of horse riding.

All of this is taken into account when creating generating an official Helmet Lab rating.

The various testing machines measure linear and rotational force transmitted by the impact through the helmet and into the head. Lower levels of force detected by sensors mean less of the effects of the impact are making it through the helmet’s protective features, and result in a higher star rating.

People care when you’re buying a helmet, how much protection it offers,” Rowson said. “So, when we started publicizing that information, it was like a light bulb to manufacturers: ‘safety sells’ … and we’ve seen that across just about every single area we’ve evaluated helmets in.” Would Your Helmet Actually Protect You? VA Tech’s ‘Helmet Lab’ Is Testing Every Sport

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57% of young Australians say their education prepared them for the future. Others are not so sure

Lucas Walsh, Monash University

When we talk about whether the education system is working we often look at results and obvious outcomes. What marks do students get? Are they working and studying after school? Perhaps we look at whether core subjects like maths, English and science are being taught the “right” way.

But we rarely ask young people themselves about their experiences. In our new survey launched on Tuesday, we spoke to young Australians between 18 and 24 about school and university. They told us they value their education, but many felt it does not equip them with the skills, experiences and support they need for future life.

Our research

In the Australian Youth Barometer, we survey young Australians each year. In the latest report, we surveyed a nationally representative group of 527 young people, aged 18 to 24. We also did interviews with 30 young people.

We asked them about their views on the environment, health, technology and the economy. In this article, we discuss their views on their education.

‘They don’t teach you the realities’

In our survey, 57% of respondents agreed or strongly agreed their education had prepared them for their future. This means about two fifths (43%) didn’t agree or were uncertain.

Many said school made them “book smart” but didn’t teach essential life skills such as budgeting, taxes, cooking, renting or workplace readiness. As one 23-year-old from Queensland told us:

They don’t teach you the realities of life and being an adult.

This may explain why 61% of young Australians in our study had taken some form of online informal classes, such as a YouTube tutorial. Young people are looking to informal learning for acquiring practical skills such as cooking, household repairs, managing finances, driving and applying for jobs.

Some interviewees discussed how informal learning – outside of formal education places – was a key site for personal development. One interviewee (21) from Western Australia explained how they had learned how to fix computer problems online: “I’ve learnt a great deal from YouTube”. Others talked about turning to Google, TikTok and, more recently, ChatGPT.

A key question here is the reliability of these sources. This is why students need critical thinking and online literacy skills so they can evaluate what they find online.

‘This is so much money’

Young people in our survey echoed wider community concerns about the rising costs of a university education. As one South Australian man (23) told us:

I was looking at the HECS that came along with [certain courses] and I was like, this is crazy, this is so much money.

One woman (19) explained how the fees had been part of the reason why she didn’t want to go to uni.

Truthfully there was nothing at uni that interested me, any careers that it would be leading me to […] also because university is so expensive, I wouldn’t want to get myself in a HECS debt for the rest of my life.

‘Why don’t I know anyone?’

For those who did go to uni, young people spoke about how they were missing out on the social side of education – partly due to COVID lockdowns, the broader move to hybrid/online learning and changes in campus experiences. As one Queensland 19-year-old told us:

For the past year and a half I kind of just went to class and then went home again and I was like, ‘Why don’t I know anyone? Why do I have no friends?’

While some students reported online study saved time, others told us they found it impersonal and disengaging. As one Victorian (23) told us:

It’s more like I’m learning from my laptop, not by a university I’m paying thousands of dollars to.

Another 23-year-old from NSW said students would complain but learn more if they had face-to-face classes:

[online is] more flexible but it means it’s harder to turn off and on […] more traditional university would be nice.

Some young people are worried

One of the key roles of education is to provide pathways to desirable futures. But 40% of young people told us they were worried about their ability to cope with everyday tasks in the future. Almost 80% told us they thought they would be financially worse off than their parents, up from 53% in 2022.

Education alone can’t address all the challenges facing young people, but we can address some key immediate issues. Our findings suggest young people believe education in Australia needs to be more affordable, practical, social and engaging. To do this we need:

• more personalised career counselling and up-to-date labour market information for school leavers and university graduates – so young people have clearer ideas about what study or training can lead to particular jobs and careers

• better ways of ensuring online learning enables connections and interactions between students and students and teachers – so learning is not as impersonal and there are more opportunities to learn in person or deliberately social online ways

• more investment in campus clubs, student wellbeing programs and peer support so young people have more opportunities to make friends and build networks.

Lucas Walsh, Professor of Education Policy and Practice, Youth Studies, Monash University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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The Roman empire built 300,000 kilometres of roads: new study

Rosario Lepore / Wikimedia, CC BY

Ray Laurence, Macquarie University

At its height, the Roman empire covered some 5 million square kilometres and was home to around 60 million people. This vast territory and huge population were held together via a network of long-distance roads connecting places hundreds and even thousands of kilometres apart.

Compared with a modern road, a Roman road was in many ways over-engineered. Layers of material often extended a metre or two into the ground beneath the surface, and in Italy roads were paved with volcanic rock or limestone.

Roads were also furnished with milestones bearing distance measurements. These would help calculate how long a journey might take or the time for a letter to reach a person elsewhere.

Thanks to these long-lasting archaeological remnants, as well as written records, we can build a picture of what the road network looked like thousands of years ago.

A new, comprehensive map and digital dataset published by a team of researchers led by Tom Brughmans at Aarhus University in Denmark shows almost 300,000 kilometres of roads spanning an area of close to 4 million square kilometres.

The Roman road network circa 150 AD. Itiner-e, CC BY

The road network

The Itiner-e dataset was pieced together from archaeological and historical records, topographic maps, and satellite imagery.

It represents a substantial 59% increase over the previous mapping of 188,555 kilometres of Roman roads. This is a very significant expansion of our mapped knowledge of ancient infrastructure.

The Via Appia is one of the oldest and most important Roman roads. LivioAndronico2013 / Wikimedia, CC BY

About one-third of the 14,769 defined road sections in the dataset are classified as long-distance main roads (such as the famous Via Appia that links Rome to southern Italy). The other two-thirds are secondary roads, mostly with no known name.

The researchers have been transparent about the reliability of their data. Only 2.7% of the mapped roads have precisely known locations, while 89.8% are less precisely known and 7.4% represent hypothesised routes based on available evidence.

More realistic roads – but detail still lacking

Itiner-e has improved on past efforts with improved coverage of roads in the Iberian Peninsula, Greece and North Africa, as well as a crucial methodological refinement in how routes are mapped.

Rather than imposing idealised straight lines, the researchers adapted previously proposed routes to fit geographical realities. This means mountain roads can follow winding, practical paths, for example.

Itiner-e includes more realistic terrain-hugging road shapes than some earlier maps. Itiner-e, CC BY

Although there is a considerable increase in the data for Roman roads in this mapping, it does not include all the available data for the existence of Roman roads. Looking at the hinterland of Rome, for example, I found great attention to the major roads and secondary roads but no attempt to map the smaller local networks of roads that have come to light in field surveys over the past century.

Itiner-e has great strength as a map of the big picture, but it also points to a need to create localised maps with greater detail. These could use our knowledge of the transport infrastructure of specific cities.

There is much published archaeological evidence that is yet to be incorporated into a digital platform and map to make it available to a wider academic constituency.

Travel time in the Roman empire

Fragment of a Roman milestone erected along the road Via Nova in Jordan. Adam Pažout / Itiner-e, CC BY

Itiner-e’s map also incorporates key elements from Stanford University’s Orbis interface, which calculates the time it would have taken to travel from point A to B in the ancient world.

The basis for travel by road is assumed to have been humans walking (4km per hour), ox carts (2km per hour), pack animals (4.5km per hour) and horse courier (6km per hour).

This is fine, but it leaves out mule-drawn carriages, which were the major form of passenger travel. Mules have greater strength and endurance than horses, and became the preferred motive power in the Roman empire.

What next?

Itiner-e provides a new means to investigate Roman transportation. We can relate the map to the presence of known cities, and begin to understand the nature of the transport network in supporting the lives of the people who lived in them.

This opens new avenues of inquiry as well. With the network of roads defined, we might be able to estimate the number of animals such as mules, donkeys, oxen and horses required to support a system of communication.

For example, how many journeys were required to communicate the death of an emperor (often not in Rome but in one of the provinces) to all parts of the empire?

Some inscriptions refer to specifically dated renewal of sections of the network of roads, due to the collapse of bridges and so on. It may be possible to investigate the effect of such a collapse of a section of the road network using Itiner-e.

These and many other questions remain to be answered.

Ray Laurence, Professor of Ancient History, Macquarie University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Lack of fibre is putting the brakes on UK’s data centre expansion, says study

Posted by Harry Baldock, New research from Neos Networks suggests that 82% of data centre operators in the UK have delayed deployment due to a lack of connectivity infrastructure

Access to fibre connectivity could be a significant bottleneck for the UK’s data centre ambitions, suggests a new study commissioned by Neos Networks.

The study, conducted by Censuswide, surveyed 100 data centre decision-makers, 100 large enterprise tech/IT decision-makers, and 100 local government stakeholders, asking them about fibre availability, AI, and their data centre projects.

The results showed that the lack of fibre network availability remains a key factor in hampering data centre deployments and AI implementation. It found that 82% of the data centre representatives had had a deployment or expansion delayed due to the lack of available fibre. In addition, 89% of the local government representatives said infrastructure projects in their region had been similarly delayed by fibre gaps, with 46% saying the region’s fibre networks were not ready to support AI data centres.

Part of the issue here, as Neos Network’s CEO Lee Myall points out, is that the UK’s ‘backbone’ fibre network – the high-capacity, long-distance infrastructure that connects major cities, data centres, internet exchanges, and service providers across the country – is at risk of becoming inadequate.

This is largely an issue of geography; data centre projects are increasingly being planned for rural areas with access to affordable land, water, and power, but fibre network access at these locations is often missing.

“Over the past decade, we’ve seen a huge amount of investment in last-mile fibre builds, but core fibre networks across the country have received much less attention. Without them, workloads cannot move between data centres, data cannot be trained, and investments stall,” said Myall. “The UK has the ambition, the demand and the regional readiness to lead in AI, but if we don’t address fibre gaps, we risk losing out on one of the greatest economic opportunities of our generation.”

The good news here is that the government’s AI Growth Zone strategy, part of its AI Opportunities Action Plan, appears to be working as intended, helping lure data centre developments away from existing deployments in metro areas. These AI Growth Zones will receive significant planning and regulatory support, aimed at removing barriers to AI data centre deployments.

While 23% of data centre operators still expect new investment in Greater London, a greater share pointed to the North of England and the Midlands (39%) for new deployments. According to the report, 96% of the data centre respondents were influenced by the AI Growth Zones when considering site selection, with 44% saying they were influenced ‘strongly’.

At the start of the year, Culham, Oxfordshire, was announced as the UK’s first AI Growth Zone, largely due to the availability of land, power, and its proximity to the UK Atomic Energy Authority’s headquarters, which carries conducts complex energy research. This was followed up last month when the Northeast announced it had secured government backing to become the country’s second AI Growth Zone, expanding existing deployments at Cobalt Park Data Centres in North Tyneside and QTS Cambois Data Centre Campus in Blyth.More of these zones are expected to be developed in future, all of which will rely on the availability of high-quality backbone connectivity.Lack of fibre is putting the brakes on UK’s data centre expansion, says study | Total Telecom

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The Ganges River is drying faster than ever – here’s what it means for the region and the world

Mehebub Sahana, University of Manchester

The Ganges, a lifeline for hundreds of millions across South Asia, is drying at a rate scientists say is unprecedented in recorded history. Climate change, shifting monsoons, relentless extraction and damming are pushing the mighty river towards collapse, with consequences for food, water and livelihoods across the region.

For centuries, the Ganges and its tributaries have sustained one of the world’s most densely populated regions. Stretching from the Himalayas to the Bay of Bengal, the whole river basin supports over 650 million people, a quarter of India’s freshwater, and much of its food and economic value. Yet new research reveals the river’s decline is accelerating beyond anything seen in recorded history.

In recent decades, scientists have documented alarming transformations across many of the world’s big rivers, but the Ganges stands apart for its speed and scale.

In a new study, scientists reconstructed streamflow records going back 1,300 years to show that the basin has faced its worst droughts over the period in just the last few decades. And those droughts are well outside the range of natural climate variability.

Stretches of river that once supported year-round navigation are now impassable in summer. Large boats that once travelled the Ganges from Bengal and Bihar through Varanasi and Allahabad now run aground where water once flowed freely. Canals that used to irrigate fields for weeks longer a generation ago now dry up early. Even some wells that protected families for decades are yielding little more than a trickle.

Global climate models have failed to predict the severity of this drying, pointing to something deeply unsettling: human and environmental pressures are combining in ways we don’t yet understand.

Water has been diverted into irrigation canals, groundwater has been pumped for agriculture, and industries have proliferated along the river’s banks. More than a thousand dams and barrages have radically altered the river itself. And as the world warms, the monsoon which feeds the Ganges has grown increasingly erratic. The result is a river system increasingly unable to replenish itself.

Melting glaciers, vanishing rivers

At the river’s source high in the Himalayas, the Gangotri glacier has retreated nearly a kilometre in just two decades. The pattern is repeating across the world’s largest mountain range, as rising temperatures are melting glaciers faster than ever.

Initially, this brings sudden floods from glacial lakes. In the long-run, it means far less water flowing downstream during the dry season.

These glaciers are often termed the “water towers of Asia”. But as those towers shrink, the summer flow of water in the Ganges and its tributaries is dwindling too.

Humans are making things worse

The reckless extraction of groundwater is aggravating the situation. The Ganges-Brahmaputra basin is one of the most rapidly depleting aquifers in the world, with water levels falling by 15–20 millimeters each year. Much of this groundwater is already contaminated with arsenic and fluoride, threatening both human health and agriculture.

The role of human engineering cannot be ignored either. Projects like the Farakka Barrage in India have reduced dry-season flows into Bangladesh, making the land saltier and threatening the Sundarbans, the world’s largest mangrove forest. Decisions to prioritise short-term economic gains have undermined the river’s ecological health.

Across northern Bangladesh and West Bengal, smaller rivers are already drying up in the summer, leaving communities without water for crops or livestock. The disappearance of these smaller tributaries is a harbinger of what may happen on a larger scale if the Ganges itself continues its downward spiral. If nothing changes, experts warn that millions of people across the basin could face severe food shortages within the next few decades.

Saving the Ganges

The need for urgent, coordinated action cannot be overstated. Piecemeal solutions will not be enough. It’s time for a comprehensive rethinking of how the river is managed.

That will mean reducing unsustainable extraction of groundwater so supplies can recharge. It will mean environmental flow requirements to keep enough water in the river for people and ecosystems. And it will require improved climate models that integrate human pressures (irrigation and damming, for example) with monsoon variability to guide water policy.

Transboundary cooperation is also a must. India, Bangladesh and Nepal must do better at sharing data, managing dams, and planning for climate change. International funding and political agreements must treat rivers like the Ganges as global priorities. Above all, governance must be inclusive, so local voices shape river restoration efforts alongside scientists and policymakers.

The Ganges is more than a river. It is a lifeline, a sacred symbol, and a cornerstone of South Asian civilisation. But it is drying faster than ever before, and the consequences of inaction are unthinkable. The time for warnings has passed. We must act now to ensure the Ganges continues to flow – not just for us, but for generations to come.

Mehebub Sahana, Leverhulme Early Career Fellow, Geography, University of Manchester

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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How safe is your face? The pros and cons of having facial recognition everywhere

Joanne Orlando, Western Sydney University

Walk into a shop, board a plane, log into your bank, or scroll through your social media feed, and chances are you might be asked to scan your face. Facial recognition and other kinds of face-based biometric technology are becoming an increasingly common form of identification.

The technology is promoted as quick, convenient and secure – but at the same time it has raised alarm over privacy violations. For instance, major retailers such as Kmart have been found to have broken the law by using the technology without customer consent.

So are we seeing a dangerous technological overreach or the future of security? And what does it mean for families, especially when even children are expected to prove their identity with nothing more than their face?

The two sides of facial recognition

Facial recognition tech is marketed as the height of seamless convenience.

Nowhere is this clearer than in the travel industry, where airlines such as Qantas tout facial recognition as the key to a smoother journey. Forget fumbling for passports and boarding passes – just scan your face and you’re away.

In contrast, when big retailers such as Kmart and Bunnings were found to be scanning customers’ faces without permission, regulators stepped in and the backlash was swift. Here, the same technology is not seen as a convenience but as a serious breach of trust.

Things get even murkier when it comes to children. Due to new government legislation, social media platforms may well introduce face-based age verification technology, framing it as a way to keep kids safe online.

At the same time, schools are trialling facial recognition for everything from classroom entry to paying in the cafeteria.

Yet concerns about data misuse remain. In one incident, Microsoft was accused of mishandling children’s biometric data.

For children, facial recognition is quietly becoming the default, despite very real risks.

A face is forever

Facial recognition technology works by mapping someone’s unique features and comparing them against a database of stored faces. Unlike passive CCTV cameras, it doesn’t just record, it actively identifies and categorises people.

This may feel similar to earlier identity technologies. Think of the check-in QR code systems that quickly sprung up at shops, cafes and airports during the COVID pandemic.

Facial recognition may be on a similar path of rapid adoption. However, there is a crucial difference: where a QR code can be removed or an account deleted, your face cannot.

Why these developments matter

Permanence is a big issue for facial recognition. Once your – or your child’s – facial scan is stored, it can stay in a database forever.

If the database is hacked, that identity is compromised. In a world where banks and tech platforms may increasingly rely on facial recognition for access, the stakes are very high.

What’s more, the technology is not foolproof. Mis-identifying people is a real problem.

Age-estimating systems are also often inaccurate. One 17-year-old might easily be classified as a child, while another passes as an adult. This may restrict their access to information or place them in the wrong digital space.

A lifetime of consequences

These risks aren’t just hypothetical. They already affect lives. Imagine being wrongly placed on a watchlist because of a facial recognition error, leading to delays and interrogations every time you travel.

Or consider how stolen facial data could be used for identity theft, with perpetrators gaining access to accounts and services.

In the future, your face could even influence insurance or loan approvals, with algorithms drawing conclusions about your health or reliability based on photo or video.

Facial recognition does have some clear benefits, such as helping law enforcement identify suspects quickly in crowded spaces and providing convenient access to secure areas.

But for children, the risks of misuse and error stretch across a lifetime.

So, good or bad?

As it stands, facial recognition would seem to carry more risks than rewards. In a world rife with scams and hacks, we can replace a stolen passport or drivers’ licence, but we can’t change our face.

The question we need to answer is where we draw the line between reckless implementation and mandatory use. Are we prepared to accept the consequences of the rapid adoption of this technology?

Security and convenience are important, but they are not the only values at stake. Until robust, enforceable rules around safety, privacy and fairness are firmly established, we should proceed with caution.

So next time you’re asked to scan your face, don’t just accept it blindly. Ask: why is this necessary? And do the benefits truly outweigh the risks – for me, and for everyone else involved?

Joanne Orlando, Researcher, Digital Wellbeing, Western Sydney University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Tiny Protein Confirmed to Dismantle the Toxic Clumps Linked to Alzheimer’s Disease

– credit, NIH

Scientists at St. Jude Children’s Research Hospital have demonstrated for the first time that the protein midkine plays a preventative role in Alzheimer’s disease.

Midkine is known to accumulate in Alzheimer’s patients, but rather than accelerate the disease, it seems to prevents a second, sticky protein from clumping together—the chief hallmark in this form of dementia.

Alzheimer’s disease drug research almost exclusively focuses on amyloid beta, referred to sometimes as tau protein—its molecular class. There are 6 kinds of tau proteins, and they’re necessary for maintaining the stability of microtubules in human nerve fibers, but when tau proteins—in particular amyloid beta—become hyperphosphorylated, they are observed to clump together around neurons and cause a kind of atrophy.

This is generally considered to be the pathology and driver of Alzheimer’s disease. The rot cause is manifold, with a patient’s genetic mutations, sex, toxin exposure, and sleep history all suspected to play a role.

Midkine, the other molecular character in this tale, is a small, multifunctional growth factor protein found abundantly during embryonic development but also involved in normal cell growth.

Its role in cell growth means that midkine is often overexpressed in cancer, making it a valuable biomarker. However, beyond some preliminary studies showing its increase in Alzheimer’s, midkine’s link to the neurodegenerative disease has been poorly understood.

In a study published on August 21st in Nature Structural & Molecular Biology, co-author author Junmin Peng and colleagues used fluorescence assays among other techniques to investigate how much of the correlation between midkine and amyloid beta is just a coincidence.

They knew that earlier Alzheimer’s models where midkine is lacking showed more amyloid beta accumulation, and so they used a fluorescent sensor to monitor amyloid beta assemblies, called thioflavin T, and tracked the real associations going on between these two compounds.

Their data revealed that midkine inhibits amyloid beta elongation and secondary nucleation, two specific phases during assembly formation. Nuclear magnetic resonance confirmed this finding.

“Once the amyloid beta assemblies grow, the signal becomes weaker and broader until it disappears because the technique can only analyze small molecules,” said Peng, referring to the ability to spot thioflavin T amid the tau ‘tangles’. “But when we add in midkine, the signal returns, showing that it inhibits the large assemblies.”

Additionally, the researchers used Alzheimer’s disease mouse models that have increased amyloid beta and demonstrated that removing the midkine gene resulted in even higher levels of amyloid beta assemblies. These results point to the protective role the protein has against Alzheimer’s disease.“We want to continue to understand how this protein binds to amyloid beta so we can design small molecules to do the same thing,” said Peng. “With this work, we hope to provide strategies for future treatment.” Tiny Protein Confirmed to Dismantle the Toxic Clumps Linked to Alzheimer’s Disease

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1 in 4 people globally still lack access to safe drinking water, report finds

Despite progress over the last decade, billions of people around the world still lack access to essential water, sanitation, and hygiene services, putting them at risk of disease and deeper social exclusion.

A new report: Progress on Household Drinking Water and Sanitation 2000–2024: special focus on inequalities , launched by WHO and UNICEF during World Water Week 2025, reveals that, while some progress has been made, major gaps persist. People living in low-income countries, fragile contexts, rural communities, children, and minority ethnic and indigenous groups face the greatest disparities.

Ten key facts from the report: 

1. Despite gains since 2015, 1 in 4 – or 2.1 billion people globally – still lack access to safely managed drinking water*, including 106 million who drink directly from untreated surface sources.
2. 3.4 billion people still lack safely managed sanitation, including 354 million who practice open defecation.
3. 1.7 billion people still lack basic hygiene services at home, including 611 million without access to any facilities.
4. People in least developed countries are more than twice as likely as people in other countries to lack basic drinking water and sanitation services, and more than three times as likely to lack basic hygiene.
5. In fragile contexts**, safely managed drinking water coverage is 38 percentage points lower than in other countries, highlighting stark inequalities.
6. While there have been improvements for people living in rural areas, they still lag behind. Safely managed drinking water coverage rose from 50 per cent to 60 per cent between 2015 and 2024, and basic hygiene coverage from 52 per cent to 71 per cent. In contrast, drinking water and hygiene coverage in urban areas has stagnated.
7. Data from 70 countries show that while most women and adolescent girls have menstrual materials and a private place to change, many lack sufficient materials to change as often as needed.
8. Adolescent girls aged 15–19 are less likely than adult women to participate in activities during menstruation, such as school, work and social pastimes.
9. In most countries with available data, women and girls are primarily responsible for water collection, with many in sub-Saharan Africa and Central and Southern Asia spending more than 30 minutes per day collecting water.
10. As we approach the last five years of the Sustainable Development Goals period, achieving the 2030 targets for ending open defecation and universal access to basic water, sanitation and hygiene services will require acceleration, while universal coverage of safely managed services in this area appears increasingly out of reach.

“Water, sanitation and hygiene are not privileges, they are basic human rights,” said Dr Ruediger Krech, Director a.e, Environment, Climate Change and Health, World Health Organization. “We must accelerate action, especially for the most marginalized communities, if we are to keep our promise to reach the Sustainable Development Goals.” 

“When children lack access to safe water, sanitation, and hygiene, their health, education, and futures are put at risk,” said Cecilia Scharp, UNICEF Director of WASH. “These inequalities are especially stark for girls, who often bear the burden of water collection and face additional barriers during menstruation. At the current pace, the promise of safe water and sanitation for every child is slipping further from reach – reminding us that we must act faster and more boldly to reach those who need it most.” Source Article

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Above-average monsoon drives rural demand for Indian automobile sector: HSBC

New Delhi : The above-average monsoon is driving rural demand for the Indian automobile sector, and tractor demand maintains momentum following the good rabi harvest, a report showed on Tuesday.

Channel partner commentary signals the higher number of auspicious days for marriage and a good rabi harvest sustained two-wheeler (2W) growth momentum in May, reports HSBC Global Research in a note.

Electric four-wheeler (e4W) penetration increased to 3.4 per cent in May. Tata's market share remained at 35 per cent, with MG at 31 per cent and M&M at 20 per cent. Hyundai with its 'e Creta’ model was at 5 per cent.

“Meanwhile, e2W sales penetration increased to 6.1 per cent with 100,000 units in retail sales. TVS's retail in May totalled 25,000 units, while Bajaj's sales were at 22,000 units. Ola is in the third spot,” according to the note.

Passenger vehicle (PV) demand was largely muted and there are no signs of recovery any time soon. Positively, original equipment manufacturers (OEMs) maintained inventory discipline.

“We expect the PV discount to stay elevated around the current level amid a weak demand outlook,” said the report.

In four-wheelers, Maruti’s volumes were up 3 per cent on-yar in May, as a 6 per cent decline in domestic sales was offset by 80 per cent growth in exports.

“M&M's SUV wholesale was 52.4k units, up 21 per cent YoY. Tata's PV volumes were down 11 per cent YoY, with EVs up 2 per cent. Hyundai domestic sales were down 11 per cent, mainly from routine plant shutdowns,” the note mentioned.

In the 2W segment, Bajaj's domestic 2W volume was up 2 per cent, while exports were up 20 per cent. TVS's 2W volumes were up 16 per cent YoY, with domestic growing 14 per cent and exports at 21 per cent.

In the tractor segment, M&M's domestic volume grew by 10 per cent, while Escorts' declined by 2 per cent. M&M's exports declined by 8 per cent, while Escorts' grew by 71 per cent.

"Early advancement of monsoons and above-average reservoir levels are positives going forward,” said the report.In the commercial vehicle (CV) vertical, volumes for key OEMs were down 3 per cent on-year and the subsegments' LCVs were down by 6 per cent, while MHCV and buses each grew by 2 per cent, said the report.Above-average monsoon drives rural demand for Indian automobile sector: HSBC | MorungExpress | morungexpress.com

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Lipolysis more effective in women than men: Study

New Delhi, (IANS) A team of researchers has said that lipolysis is more effective in women than in men, which could partly explain why women are less likely to develop metabolic complications than men, despite having more body fat.

The research focused on lipolysis, the process through which triglycerides – lipids stored in fat cells – are broken down to produce free fatty acids and glycerol, which can be used as energy, during exercise or between meals.

“The breakdown of lipids through lipolysis is essential for energy balance and it is believed that doing it effectively may prevent type 2 diabetes and other metabolic complications of overweight and obesity,” said Professor Peter Arner, of the Karolinska Institutet, Stockholm, Sweden.

“Indeed, lipolysis is more effective in women than in men, which could be one reason why women are less likely to develop metabolic complications than men, despite having more body fat,” Arner added.

Hormones called catecholamines play a key role in activating lipolysis and regulating the various steps in the process and it is known that when levels of these hormones increase, due to psychological stress or during exercise, for example, lipolysis is activated more strongly in women than in men.

According to the study, a better understanding of how this occurs could pave the way for drugs and other treatments that lower the risk of type 2 diabetes in men with overweight and obesity.

To find out more, Professor Arner and Dr Daniel P Andersson of the Karolinska University Hospital Huddinge in Stockholm, measured lipolysis in abdominal subcutaneous fat cells from adult women and men.

The cells were incubated alone or with increasing concentrations of several catecholamines that are known to act at different steps in lipolysis.

The amount of glycerol released was used to measure the amount of lipolysis.

This revealed that the fat cells from the women were less sensitive to the catecholamines than the fat cells from the men, meaning that that higher concentrations were needed to activate and regulate lipolysis.

However, when lipolysis was activated, it took place at a faster rate in the cells from the women than in those from the men.“Longer-term, our findings could aid in the development of drugs that lower the risk of type 2 diabetes in men,” said Arner. Lipolysis more effective in women than men: Study | MorungExpress | morungexpress.com

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Australia and North America have long fought fires together – but new research reveals that has to change

Doug Richardson, UNSW Sydney and Andreia Filipa Silva Ribeiro, Helmholtz Centre for Environmental Research-UFZ

Climate change is lengthening fire seasons across much of the world. This means the potential for wildfires at any time of the year, in both hemispheres, is increasing.

That poses a problem. Australia regularly shares firefighting resources with the United States and Canada. But these agreements rest on the principle that when North America needs these personnel and aircraft, Australia doesn’t, and vice versa. Climate change means this assumption no longer holds.

The devastating Los Angeles wildfires in January, the United States winter, show how this principle is being tested. The US reportedly declined Australia’s public offer of assistance because Australia was in the midst of its traditional summer fire season. Instead, the US sought help from Canada and Mexico.

But to what extent do fire seasons in Australia and North America actually overlap? Our new research examined this question. We found an alarming increase in the overlap of the fire seasons, suggesting both regions must invest far more in their own permanent firefighting capacity.

What we did

We investigated fire weather seasons – that is, the times of the year when atmospheric conditions such as temperature, humidity, rainfall and wind speed are conducive to fire.

The central question we asked was: how many days each year do fire weather seasons in Australia and North America overlap?

To determine this, we calculated the length of the fire weather seasons in the two regions in each year, and the number of days when the seasons occur at the same time. We then analysed reconstructed historical weather data to assess fire-season overlap for the past 45 years. We also analysed climate model data to assess changes out to the end of this century.

And the result? On average, fire weather occurs in both regions simultaneously for about seven weeks each year. The greatest risk of overlap occurs in the Australian spring – when Australia’s season is beginning and North America’s is ending.

The overlap has increased by an average of about one day per year since 1979. This might not sound like much. But it translates to nearly a month of extra overlap compared to the 1980s and 1990s.

The increase is driven by eastern Australia, where the fire weather season has lengthened at nearly twice the rate of western North America. More research is needed to determine why this is happening.

Longer, hotter, drier

Alarmingly, as climate change worsens and the atmosphere dries and heats, the overlap is projected to increase.

The extent of the overlap varied depending on which of the four climate models we used. Assuming an emissions scenario where global greenhouse gas emissions begin to stabilise, the models projected an increase in the overlap of between four and 29 days a year.

What’s behind these differences? We think it’s rainfall. The models project quite different rainfall trends over Australia. Those projecting a dry future also project large increases in overlapping fire weather. What happens to ours and North America’s rainfall in the future will have a large bearing on how fire seasons might change.

While climate change will dominate the trend towards longer overlapping fire seasons, El Niño and La Niña may also play a role.

These climate drivers involve fluctuations every few years in sea surface temperature and air pressure in part of the Pacific Ocean. An El Niño event is associated with a higher risk of fire in Australia. A La Niña makes longer fire weather seasons more likely in North America.

There’s another complication. When an El Niño occurs in the Central Pacific region, this increases the chance of overlap in fire seasons of North America and Australia. We think that’s because this type of El Niño is especially associated with dry conditions in Australia’s southeast, which can fuel fires.

But how El Niño and La Niña will affect fire weather in future is unclear. What’s abundantly clear is that global warming will lead to more overlap in fire seasons between Australia and North America – and changes in Australia’s climate are largely driving this trend.

Looking ahead

Firefighters and their aircraft are likely to keep crossing the Pacific during fire emergencies.

But it’s not difficult to imagine, for example, simultaneous fires occurring in multiple Australian states during spring, before any scheduled arrival of aircraft from the US or Canada. If North America is experiencing late fires that year and cannot spare resources, Australia’s capabilities may be exceeded.

Likewise, even though California has the largest civil aerial firefighting fleet in the world, the recent Los Angeles fires highlighted its reliance on leased equipment.

Fire agencies are becoming increasingly aware of this clash. And a royal commission after the 2019–20 Black Summer fires recommended Australia develop its own fleet of firefighting aircraft.

Long, severe fire seasons such as Black Summer prompted an expansion of Australia’s permanent aerial firefighting fleet, but more is needed.

As climate change accelerates, proactive fire management, such as prescribed burning, is also important to reduce the risk of uncontrolled fire outbreaks.

Doug Richardson, Research Associate in Climate Science, UNSW Sydney and Andreia Filipa Silva Ribeiro, Climate Researcher, Helmholtz Centre for Environmental Research-UFZ

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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