Wednesday, August 06, 2025

A year on, Ugandans still suffering from deadly garbage collapse


By AFP
August 6, 2025


The collapse of a mountain of waste in the Ugandan capital on August 9, 2024, killed 35 people - Copyright AFP/File BADRU KATUMBA
Sophie NEIMAN

When the giant landfill collapsed in Uganda’s capital Kampala a year ago, Zamhall Nansamba thought she was hearing an aeroplane taking off.

Then came screams and a giant wave of garbage rushing towards her, ripping up trees as it went.

Nansamba, 31, grabbed her children and ran. She was luckier than most — the avalanche of waste killed some 35 people before stopping at her doorstep.

Many survivors of the collapse at the Kiteezi dump on August 9, 2024, have yet to be compensated for their losses, leaving them trapped at the dangerous garbage site.

“We are living a miserable life,” Nansamba told AFP.

Kiteezi is the largest landfill in Kampala, serving the city’s residents since 1996, receiving 2,500 tonnes of waste daily.

City authorities recommended closing it when it reached capacity in 2015, but garbage kept coming.

The disaster highlighted the challenge of managing waste in many rapidly urbanising African cities.

A 2017 landfill collapse in Ethiopia killed 116 people. A year later, 17 died after heavy rain caused a landslide at a dump in Mozambique.

It doesn’t help that wealthier countries send vast amounts of waste to Africa, particularly second-hand clothes, computers and cars.

In 2019, the United States exported some 900 million items of second-hand clothing to Kenya alone, more than half designated as waste, according to Changing Markets Foundation, an advocacy group.

The Kiteezi collapse “could have been avoided”, said Ivan Bamweyana, a scholar of geomatics at Kampala’s Makerere University.

For a decade, he said, the landfill grew vertically until it reached a height of some 30 metres (98 feet).

Early on the fateful morning, rain seeped into the landfill’s cracks, causing a fatal cascade.

“What is coming can still be avoided,” Bamweyana said, of the continued risks at the site.



– Another crash? –



The landfill continues to emit methane gas, which caused fires in February and June.

While no longer in official use, locals sneak up its slopes to eke out a living collecting plastic bottles to sell.

“I would not be shocked if there was a secondary crash,” Bamweyana said.

Official figures of the number of homes destroyed vary, but it is certain that dozens disappeared in the initial incident, with more totalled during the hunt for bodies.

A Red Cross spokesperson said many of the 233 people displaced have still not received compensation.

Shadia Nanyongo’s home was buried and she now shares a single room with six other family members.

The 29-year-old told AFP she had still not been compensated. The family eats one meal a day and at night squeezes together on two mattresses on the floor.

“I pray to God to come with money, because this situation is not easy,” Nanyongo said.

Her friend, fellow survivor Nansamba, still lives on the edge of the landfill.

The stench of garbage fills her house and the area is infested with vermin. She said her children get bacterial infections at least three times a month.

Nansamba would like to move but cannot afford to unless the government, which promised compensation, pays out for other houses she owned and rented out and lost in the disaster. Her own house was not destroyed.

Memories of the collapse keep her up at night. “You hear dogs barking… you think ghosts have come,” she said.



– ‘Hurriedly and illegally’ –



Kampala Capital City Authority (KCCA) told AFP that compensation would be paid out in September and a new landfill site had been chosen in Mpigi district, around 30 kilometres (19 miles) from the city centre.

KCCA says everything has been done legally, but the National Forestry Authority (NFA) told AFP that the new garbage site infringes on a protected forest and wetlands reserve and that city authorities began dumping at the site in late 2024 without their knowledge.

“They did it hurriedly (and) illegally,” said NFA spokesperson Aldon Walukamba.

The city is home to some 1.7 million, according to last year’s census, and continues to grow — meaning such trade-offs between trash and the environment will likely continue.

For Bamweyana, the scholar, what is needed is education about waste and recycling.

“We cannot keep solving the problem using the same mechanism that created it,” he said.

 

Living in hurricane affected areas could increase mortality of older people by 9% years after disaster



Researchers found increased, but regionally varying, risk of death from all causes for those who continued to live in flood-affected zip codes, highlighting the importance of region-specific disaster planning




Frontiers






Hurricanes and related natural catastrophes like flooding are becoming more severe and more frequent around the world. Older people are especially at risk, but relatively little is known about long-term health effects. In 2012, the north-east US was hit by Hurricane Sandy, which resulted in unusable transportation systems, destruction of homes, power loss, and more than 100 casualties.

But what about the people who continue living in hurricane-mangled areas? Now, researchers in the US have investigated if staying put after the landfall of Sandy increased mortality risk from all causes among health-insured people aged 65 or above.

“We show that areas impacted by hurricane-related flooding after Hurricane Sandy had higher rates of mortality from any reason,” said Dr Arnab Ghosh, senior author of the Frontiers in Public Health study who is an assistant professor of medicine at Cornell University. “Hurricane flood exposure was linked to a 9% increased risk of death for those residing in hurricane flooded areas up to five years after landfall.”

Risky zip codes

The team split parts of New York State, New Jersey, Connecticut, and New York City – the areas that were most affected – into 959 zip-code tabulation areas (ZCTAs). 454 of these ZCTAs had been impacted by flooding, the others were within a 10-mile radius of flooded ZCTAs. The researchers used data from almost 300,000 people aged 65 or older who were enrolled in the US federal health insurance program (Medicare parts A and B) and had continued to reside in the same zip code area from 2013 to 2017. They controlled for various demographic and socioeconomic factors for all ZCTAs, including age, gender, race, and living circumstances.

The researchers focused on older adults due to their increased vulnerability in the aftermath of extreme weather, which may include higher rates of medical comorbidities, functional limitations, and cognitive impairment compared to younger people. In addition, this demographic group is fast-growing, and likely will be requiring more assistance during and after future disasters.

The results showed that Medicare beneficiaries who stayed in flooding-impacted ZCTAs in the tri-state area had a significantly higher risk – 9% on average – of death from all causes up to five years after the hurricane hit than people living in flooding-unaffected zip codes. “Our findings underscore the importance of considering long-term health impacts of hurricane-related flooding on older adults, and the need to reconsider how disasters impact people’s lives in the longer term,” said Ghosh.

Localized disaster response

Previous studies had shown that risk of death from any cause can rise after natural disasters, but the geographic distribution of increased risk surprised the researchers. Risk of death increased the most for people living in flooded areas in Connecticut and New York City, by 19% and 8%, respectively, compared to people living in non-flooded areas. “We were surprised by the finding that two socioeconomically different regions both exhibited significant effects on mortality risk. This emphasizes the importance of region-specific considerations,” explained Ghosh.

While New York City ZCTAs have been associated with socioeconomic and demographic characteristics that may result in greater exposure to natural disasters, the same characteristics cannot be found in Connecticut, where more White people whose average household income is higher live in less overcrowded homes. Yet, out of the studied regions, Connecticut had the highest mortality risk increase between flooded ZCTAs and non-flooded ZCTAs. The reasons for this regional variation needs to be investigated in further studies, the team said. “It’s possible that regional nuances in Connecticut influence long-term mortality effects post-flood,” said Ghosh. “This could include region-specific policies, infrastructure disruption, and disaster relief.” In New Jersey and New York State risk of death from any cause didn’t increase significantly between ZCTAs.

These findings do not extend to individual mortality risk, the researchers said. Disaster preparedness often focuses on population risk, so understanding long-term risks on this level is crucial. “As disasters hit the same regions again and again, understanding how and why vulnerable populations are more likely to be adversely impacted will be clearly important, and our study helps explain why,” Ghosh concluded.

 

Pollination behavior has huge role in plant evolution




Oxford University Press USA
Amazonvine plants 

image: 

Taken in March 2020 during data collection at Parque Nacional do Catimbau, Pernambuco, Brazil.

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Credit: Liedson Carneiro/Annals of Botany





A new paper in Annals of Botany, published by Oxford University Press, indicates that pollination can have a dramatic effect on how plants grow and change. The study shows that when plants and pollinators become uncoordinated (even for a brief time) it can change who reproduces best and change plant diversity. The paper offers new insights into how evolution works in real time.

Pressures on pollination behavior can fluctuate over reproductive seasons, influencing which plants animals pollinate. Changes in the interaction between plants and pollinators within a single flowering season show how such interactions vary on short timescales, potentially affecting the healthiness of plant populations.

Pollinators, including birds, bats, butterflies, moths, flies, beetles, wasps, and bees, play a crucial role in the diversification of flowering plants through their influence on natural selection. Plant–pollinator interactions are key drivers of variation in the external characteristics of plants and play a huge role in shaping a range of floral traits including flower size, floral display, and flowering time. Several pollination components influence selection patterns, such as how long pollinator animals spend at the plant, how intensely they pollinate, and their behavior when pollinating.

Researchers here identified levels of plant-pollinator temporal overlap—the time when insects are mostly likely to pollinate flowers—for the floral oil-producing Amazonvine in the dry tropical forest Parque Nacional do Catimbau in Pernambuco, northeastern Brazil, between February and April of 2020. In this system, bees collect oil secreted by floral oil glands through petal grasping and leg extensions, leaving characteristic visitation marks that help track pollination events.

The Amazonvine cannot reproduce on its own and depends on pollination from oil-collecting bees. Researchers collected information about the plant population at two separate times. The first sampling time occurred within the species’ usual peak flowering period, when the population exhibited a high number of flowers, but pollinator visitation was very scarce. After monitoring the population continuously, the investigators sampled the plants again four weeks later, at a time of high pollinator activity.

This revealed a shift in both direction and strength of fitness-flower size relationship that accompanies different flowering times, resulting in a weak selection in overall reproductive season. The researchers found that bees picked plants with larger flowers that reproduced more during peak flowering, but fitness was higher in plants with smaller flowers during the second observation time. This is because peak- and late-flowering plants experienced different intensities of pollinator visitation. Only 7.5% of the flowers on peak-flowering plants (out of 134 flowers) showed marks of visitation indicating pollination, whereas this percentage increased to 93.6% in late-flowering plants (out of 140 flowers).

By estimating fitness functions under different intensities of flower–pollinator overlap, the investigators demonstrated that selection patterns in a plant population can be influenced strongly, and quite quickly. Though the results show that pollinators have a strong preference for plants with large flowers, changes in the overlap between the time the bees visited and when the plants flowered led to meaningful selection differences.

Observers tend to think about climate-driven phenological mismatches across years, but this paper shows that within-season mismatches (between peak and late blooming flowers) can still drive change plant fitness. As climate change disrupts seasonal cues, asynchronies between plants and pollinators will likely increase. This study suggests how such changes could affect plant reproduction and evolution.

“Our findings show that even within a single flowering season, temporal mismatches between plants and pollinators can shift how traits like flower size relate to reproductive success,” said the paper’s lead author, Liedson Carneiro. “These short-term dynamics may influence evolutionary outcomes, help maintain trait diversity, and prevent rapid trait change in plant populations.”

The paper, “Evolutionary consequences of flowering-pollinator asynchrony: The case of a floral oil-producing plant and its oil-collecting bees,” is available (at midnight on August 6th) at https://academic.oup.com/aob/article-lookup/doi/10.1093/aob/mcaf126.

To request a copy of the study, please contact:
Daniel Luzer 
daniel.luzer@oup.com

 

Predicting respiratory disorder mortality in dogs



Prognosis indicators may be detectable in canine test results




Osaka Metropolitan University

Example of a common dog breed treated for respiratory disorders 

image: 

Chihuahuas made up 35.4% of cases that visited the veterinary hospital with respiratory distress.

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Credit: Osaka Metropolitan University





Respiratory disorders in dogs can quickly become critical and are reported to be the second leading cause of cardiac arrest in canines. Therefore, it is necessary to take appropriate measures according to each patient’s condition. This, however, requires rapid and accurate disease severity assessments. In human medicine, scoring systems that incorporate physical examinations and blood tests results with respiratory function assessments exist, and enable more accurate severity assessments. In contrast, there are only a few reports on severity assessments that use tests other than respiratory function evaluations in veterinary medicine. Further, these evaluations usability remains unclear.

A research group led by Associate Professor Toshiyuki Tanaka and Dr. Muryo Miki at Osaka Metropolitan University’s Graduate School of Veterinary Medicine explored factors associated with the prognosis of respiratory disorders in dogs. The team examined medical records that included general physical examinations and blood test results of 133 dogs who visited an emergency veterinary hospital with respiratory disorders. A statistical analysis of 105 survivors and 28 non-survivors revealed significant differences in heart rate, body temperature, white blood count (WBC), glucose, blood urea nitrogen (BUN), lactate, and, most significantly, phosphate. Similar to human prognoses, non-survivor test results that showed elevated levels of phosphate indicated poor outcomes. 

“As far as we know, this study is the first to report that phosphate may be a prognostic indicator in canine respiratory disorders. In addition, the indicators suggested by this study are generally easy to measure and therefore are widely applicable in various facilities,” stated Dr. Miki.

Professor Tanaka added, “Since this survey covers a broad range of diseases classified as respiratory disorders, we believe that it is necessary to conduct surveys targeting individual diseases. We will also continue to investigate the reasons for the increase in phosphate.”

The study was published in PLOS One.  

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About OMU  

Established in Osaka as one of the largest public universities in Japan, Osaka Metropolitan University is committed to shaping the future of society through “Convergence of Knowledge” and the promotion of world-class research. For more research news, visit https://www.omu.ac.jp/en/ and follow us on social media: XFacebookInstagramLinkedIn

 

Could natural rubber be a sustainable resource for next-gen flexible electronics?




Wiley





Flexible electronics—including wearable devices, stretchable sensors, and soft robotics—require materials that integrate mechanical flexibility, stretchability, and durability with additional attributes like electrical conductivity. A review in the journal Small considers the potential of natural rubber as a sustainable resource to minimize the carbon footprint of flexible electronics.

The authors examine how natural rubber might be used in different types of flexible sensors, self-powered systems, and energy harvesting devices, and they consider possible modifications that might enhance natural rubber’s electrical and mechanical properties. The review also discusses challenges and opportunities associated with natural rubber–based flexible electronics, offering insights into future research and plausible commercial applications.

"For years, my research team has been working on the possibilities of using natural rubber and its derivatives for flexible sensors and triboelectric nanogenerators, and we have seen that the inherent properties of gum material can be tuned to generate a new class of sustainable material-based flexible electronics,” said corresponding author Titash Mondal, PhD, of the Indian Institute of Kharagpur. “We are working towards understanding further fundamentals associated with such a system and are making efforts to have an effective lab-to-market transition through appropriate partners.”

URL upon publication: https://onlinelibrary.wiley.com/doi/10.1002/smll.202506264

 

Additional Information
NOTE:
 The information contained in this release is protected by copyright. Please include journal attribution in all coverage. For more information or to obtain a PDF of any study, please contact: Sara Henning-Stout, newsroom@wiley.com.

About the Journal
Small is a nanoscience & nanotechnology journal providing the very best forum for fundamental and interdisciplinary applied research at the nano- and microscale, covering chemistry, energy, physical & materials science, engineering, and biomedical and life sciences. Among other topics, the journal covers nanotechnology, organic electronics, nanostructures, and materials such as graphene.

About Wiley     
Wiley is one of the world’s largest publishers and a trusted leader in research and learning. Our industry-leading content, services, platforms, and knowledge networks are tailored to meet the evolving needs of our customers and partners, including researchers, students, instructors, professionals, institutions, and corporations. We empower knowledge-seekers to transform today’s biggest obstacles into tomorrow’s brightest opportunities. For more than two centuries, Wiley has been delivering on its timeless mission to unlock human potential. Visit us at Wiley.com. Follow us on FacebookXLinkedIn and Instagram.

 

Excessive screen time among youth may pose heart health risks



The time children and young adults spend on phones, gaming consoles and other devices could put their heart health at risk, finds a new study published in the Journal of the American Heart Association





American Heart Association





Research Highlights:


  • Increased time on electronic devices or watching TV among children and young adults was associated with higher cardiometabolic disease risk, such as high blood pressure, high cholesterol and insulin resistance, based on data from over 1,000 study participants in Denmark.

  • The link between screen time and cardiometabolic risks was strongest among youth who slept fewer hours, suggesting that screen use may harm health by “stealing” time from sleep, researchers said.

  • Researchers said the findings underscore the importance of addressing screen habits among young people as a potential way to protect long-term heart and metabolic health.

DALLAS, Aug. 6, 2025 — Children and young adults who spend excessive hours glued to screens and electronic devices may have higher risks for cardiometabolic diseases, such as high blood pressure, high cholesterol and insulin resistance, according to new research published today in the Journal of the American Heart Association, an open-access, peer-reviewed journal of the American Heart Association.

2023 scientific statement from the American Heart Association noted that “cardiometabolic risk is accruing at younger and younger ages,” and only 29% of American youth, ages 2 to 19 years, had favorable cardiometabolic health based on 2013-2018 data from the National Health and Nutrition Examination Survey.

This analysis of more than 1,000 participants in two studies in Denmark found that increased recreational screen time was significantly associated with higher cardiovascular risks and cardiometabolic risks among children and adolescents.

“Limiting discretionary screen time in childhood and adolescence may protect long-term heart and metabolic health,” said study lead author David Horner, M.D., PhD., a researcher at the Copenhagen Prospective Studies on Asthma in Childhood (COPSAC) at the University of Copenhagen in Denmark. “Our study provides evidence that this connection starts early and highlights the importance of having balanced daily routines.”

Using data from a group of 10-year-olds studied in 2010 and a group of 18-year-olds in 2000 that were part of the Copenhagen Prospective Studies on Asthma in Childhood cohorts, researchers examined the relationship between screen time and cardiometabolic risk factors. Screen time included time spent watching TV, movies, gaming or using phones, tablets or computers for leisure.

Researchers developed a composite score based on a cluster of metabolic syndrome components — waist size, blood pressure, high-density lipoprotein or HDL “good” cholesterol, triglycerides and blood sugar levels – and adjusted for sex and age. The cardiometabolic score reflected a participant’s overall risk relative to the study group average (measured in standard deviations): 0 means average risk, and 1 means one standard deviation above average.

The analysis found that each extra hour of screen time increased the cardiometabolic score by about 0.08 standard deviations in the 10-year-olds and 0.13 standard deviations in the 18-year-olds. “This means a child with three extra hours of screen time a day would have roughly a quarter to half a standard-deviation higher risk than their peers,” Horner said.

“It’s a small change per hour, but when screen time accumulates to three, five or even six hours a day, as we saw in many adolescents, that adds up,” he said. “Multiply that across a whole population of children, and you’re looking at a meaningful shift in early cardiometabolic risk that could carry into adulthood.”

The analysis also found that both sleep duration and sleep timing affected the relationship between screen time and cardiometabolic risk. Both shorter sleep duration and going to sleep later intensified the relationship between screen time and cardiometabolic risk. Children and adolescents who had less sleep showed significantly higher risk associated with the same amount of screen time.

“In childhood, sleep duration not only moderated this relationship but also partially explained it: about 12% of the association between screen time and cardiometabolic risk was mediated through shorter sleep duration,” Horner said. “These findings suggest that insufficient sleep may not only magnify the impact of screen time but could be a key pathway linking screen habits to early metabolic changes.”

In addition, a machine learning analysis identified a unique metabolic signature in the blood that appeared to be associated with screen time.

“We were able to detect a set of blood-metabolite changes, a ‘screen-time fingerprint,’ validating the potential biological impact of the screen time behavior,” he said. “Using the same metabolomics data, we also assessed whether screen time was linked to predicted cardiovascular risk in adulthood, finding a positive trend in childhood and a significant association in adolescence. This suggests that screen-related metabolic changes may carry early signals of long-term heart health risk.

“Recognizing and discussing screen habits during pediatric appointments could become part of broader lifestyle counseling, much like diet or physical activity,” he said. “These results also open the door to using metabolomic signatures as early objective markers of lifestyle risk.”

Amanda Marma Perak, M.D., M.S.CI., FAHA, chair of the American Heart Association’s Young Hearts Cardiovascular Disease Prevention Committee, who was not involved in this research, said focusing on sleep is a great starting point to change screen time patterns.

“If cutting back on screen time feels difficult, start by moving screentime earlier and focusing on getting into bed earlier and for longer,” said Perak, an assistant professor of pediatrics and preventive medicine at Northwestern University Feinberg School of Medicine in Chicago.

Adults can also set an example, she said. “All of us use screens, so it’s important to guide kids, teens and young adults to healthy screen use in a way that grows with them. As a parent, you can model healthy screen use – when to put it away, how to use it, how to avoid multitasking. And as kids get a little older, be more explicit, narrating why you put away your devices during dinner or other times together.

“Make sure they know how to entertain and soothe themselves without a screen and can handle being bored! Boredom breeds brilliance and creativity, so don’t be bothered when your kids complain they’re bored. Loneliness and discomfort will happen throughout life, so those are opportunities to support and mentor your kids in healthy ways to respond that don’t involve scrolling.”

As an observational study using prospectively collected data, the findings reflect associations rather than proving cause and effect. Moreover, parents of the 10-year-olds and the 18-year-olds reported screen time through questionnaires, which may not accurately reflect the actual time youth spent on screens.

Horner suggested that future research could explore whether limiting screen use in the hours before sleep, when light from screen exposure may disrupt circadian rhythms and disrupt sleep onset, may be an avenue to help reduce cardiometabolic risk.

Study details, background and design:

  • The two prospective research groups at COPSAC in Denmark consisted of mother-child pairs, with analysis of data collected at planned clinical visits and study assessments from the birth of the children through age 10 in the 2010 study group and age 18 in the 2000 study group.
  • Through questionnaires, parents of children in the 10-year-old group and 18-year-olds detailed the number of hours the young participants spent watching TV or movies, gaming on a console/TV and using phones, tablets or computers for leisure.
  • For the 2010 group, the number of hours of screen time was available for 657 children at age 6 and 630 children at age 10. Average screen time was two hours per day at age 6, and 3.2 hours per day at age 10, representing a significant increase over time.
  • For the 2000 group of 18-year-olds, screen time was available for 364 individuals. Screen time at 18 years was significantly higher at an average of 6.1 hours per day.
  • Sleep was measured by sensors over a 14-day period.

Co-authors, disclosures and funding sources are listed in the manuscript.

Studies published in the American Heart Association’s scientific journals are peer-reviewed. The statements and conclusions in each manuscript are solely those of the study authors and do not necessarily reflect the Association’s policy or position. The Association makes no representation or guarantee as to their accuracy or reliability. The Association receives more than 85% of its revenue from sources other than corporations. These sources include contributions from individuals, foundations and estates, as well as investment earnings and revenue from the sale of our educational materials. Corporations (including pharmaceutical, device manufacturers and other companies) also make donations to the Association. The Association has strict policies to prevent any donations from influencing its science content and policy positions. Overall financial information is available here.

Additional Resources:

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About the American Heart Association

The American Heart Association is a relentless force for a world of longer, healthier lives. Dedicated to ensuring equitable health in all communities, the organization has been a leading source of health information for more than one hundred years. Supported by more than 35 million volunteers globally, we fund groundbreaking research, advocate for the public’s health, and provide critical resources to save and improve lives affected by cardiovascular disease and stroke. By driving breakthroughs and implementing proven solutions in science, policy, and care, we work tirelessly to advance health and transform lives every day. Connect with us on heart.orgFacebookX or by calling 1-800-AHA-USA1.