Consider having a life-threatening illness. All scientific assessments point to a definitive diagnosis and a grim prognosis. Yet, upon visiting a doctor, they fail to acknowledge the condition directly. After some brief small talk, they shake your hand and suggest scheduling your next appointment in a year.
No one would accept such a medical standard, yet this mirrors our approach to climate change. The 30th Conference of the Parties (COP) Summit wrapped up last weekend in Belém, Brazil. While notable strides have been made in addressing climate change, particularly with the 2015 Paris Agreement aimed at restricting temperature increases to below 1.5°C, this goal is largely unachieved. Nonetheless, it steers us towards reduced warming compared to what might have been without it.
However, it’s evident that the COP process is becoming inadequate for the challenges we face. As highlighted in our report on page 6, COP30 concluded without even mentioning fossil fuels—the primary driver of climate change—in the final document. Despite over 80 nations advocating for a roadmap toward a “post-fossil fuel transition,” this initiative faced resistance from oil-rich nations like Saudi Arabia, a former organizer of COP. The necessity of consensus within COP leaves us only with the promise of future discussions at COP31 in Turkey next year.
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Nations advocating for climate action should prioritize solar power and battery technology. “
This situation cannot persist, but changing the COP process will be a challenge. If we can’t advocate for an end to the fossil fuel era through scientific and political means, we must turn to technological and economic solutions.
Nations committed to climate action should concentrate on solar energy and battery technologies, providing the world with cheaper alternatives to oil and gas. Countries striving for a sustainable future might need to implement economic sanctions against those showing disinterest in progress. Whatever the course of action, simply saying “see you next year” is no longer a viable option.
Recent studies suggest that our evolutionary predecessors may have prioritized gender over survival, potentially explaining why men tend to have shorter lifespans than women.
Historically and globally, men usually live shorter lives than women. To understand the reasons behind this evolutionary trend, researchers at the Max Planck Institute in Germany focused on insights from our animal relatives rather than solely examining human history.
Their study, published in Advances in Science, analyzed over 1,000 animal species to identify evolutionary traits associated with gender differences in lifespan.
The team discovered that while genetics plays a role, monogamy is also significant in influencing male lifespan. In contrast, parenting may contribute to women’s longer lives.
In humans, women live on average 5 years longer than men, but this trend is not unique to our species. In fact, 72% of mammals show that females live on average 12% longer than their male counterparts, with some female moose living more than twice as long as males.
However, this pattern doesn’t hold true across all animal species. In birds, males frequently outlive females.
A primary explanation lies in chromosomes, which are fundamental to gender differences. Female mammals possess two X chromosomes, whereas males have a shorter Y chromosome.
According to Dr. Johanna Staerk, the lead researcher, “Men’s single X chromosome means they are particularly susceptible to harmful mutations, as they lack a second copy for compensation,” she explained to BBC Science Focus.
“The ‘toxic Y’ hypothesis posits that the Y chromosome may harbor genetic factors that negatively influence health and aging.”
Conversely, in birds with ZW chromosomes, males have two Z chromosomes while females possess one Z and a truncated W chromosome. However, if chromosomes were the sole factor, males would live longer in all bird species.
“Some species demonstrate the opposite of what we expect,” Staerk noted. “In many birds of prey, for instance, females exhibit longer lifespans than males. This indicates that sex chromosomes alone cannot explain the patterns.”
What other factors are at play? Researchers believe that the issue involves more than mere genetic sex; it includes reproductive strategies. While birds typically show monogamous behavior, only a minority of mammals do.
“Males frequently bear the burden of mating endeavors,” Staerk said. “To attract mates, they develop traits like big horns and manes that require energy investments, increasing their risk of injury and reducing their lifespan.”
The effort to develop large horns and then engage with rivals means that male moose live only half as long as females – Credit: Getty Images
Attractive and robust males tend to father more offspring, but the biological resources required for developing larger muscle and horn structures negatively impact their lifespans. In monogamous species, the competition is less intense, allowing males to avoid such trade-offs during evolution, resulting in smaller lifespan gaps between sexes.
One intriguing finding highlighted how parenting influences lifespan. While one might assume that parental responsibilities detract from longevity due to energy exertion, the opposite was observed: caregiving genders often live longer, especially in species like primates, where offspring require extended care.
For example, a mother chimpanzee may care for her young for up to a decade. This implies that mothers who live longer are better positioned to nurture their offspring.
“Extended lifespans enable caregivers to obtain selective advantages by ensuring that their young reach maturity,” stated Staerk.
However, it remains challenging to determine definitively whether the longevity benefits stem from parenting alone or from monogamy.
Ultimately, being a dedicated partner and parent seems crucial to achieving a longer lifespan for men, particularly from an evolutionary standpoint.
Women live longer than men in all countries on average
Peter Cabana/Aramie
The most extensive assessment of lifespan disparities between male and female mammals and birds has provided new insights
into why women generally outlive men.
They discovered that in 72% of mammal species, females live longer than males by an average of 12 to 13%. Conversely, in birds, males tend to outlive females in 68% of species, surviving approximately 5% longer.
Researchers posit that this trend supports the hypothesis that sex chromosomes may account for some lifespan differences.
In mammals, the presence of two X chromosomes in females grants individual genetic protection, unlike males who possess an X and a Y chromosome. This may provide women with a better safeguard against harmful mutations.
For birds, the sex determination system is reversed; females have one Z and one W chromosome while males carry two Z chromosomes. This discrepancy suggests that the gender on different chromosomes may incur different longevity costs.
“What’s particularly intriguing is when we identify exceptions,” says team member Fernando Colcello,
also at the Max Planck Institute. “These exceptions prompt further testing of evolutionary theories regarding gender differences in lifespan.”
Diving deeper into the data, the researchers found that mating systems might influence these outcomes. In polygamous mammals, where competition is prevalent among males, those individuals usually have shorter lifespans than females.
“In the race for mating opportunities, males often invest in characteristics favored in sexual selections, such as size or ornate features,” explains Nicole Riddle from the University of Alabama.
“These traits are costly to develop, and competition can lead to additional expenditures on aggressive behaviors.”
Such factors can result in reduced resources available for personal survival, she states.
Men who invest in expensive traits to acquire mates may have shorter lifespans
Rebius/Shutterstock
This phenomenon is also seen in polygamous birds. “Overall, this may explain the comparatively lower male dominance in bird species,” states Pau Carazo from the University of Valencia in Spain.
He explains that in mammals, both genetic factors and sexual selection influence shorter male lifespans, while in birds, strong sexual selection pressures on males and the varied costs for females may counterbalance the effects.
Stärk and her colleagues additionally found that those who invest more in offspring care tend to live longer, which is predominantly the case for females in mammals. In long-lived species such as humans and primates, this trait may confer an evolutionary advantage by ensuring that mothers survive until their offspring reach sexual maturity.
However, exceptions exist. “In predatory species, the opposite pattern emerges,” notes Stärk. “Females are typically larger and often take on roles in territory defense, yet they still exhibit longer lifespans,” leaving this phenomenon an ongoing enigma.
Carazo remarks that gender lifespan differences can lead to smaller populations in zoos compared to the wild. This controlled environment may also be a factor in the reduced lifespan discrepancies observed among human genders, though these differences are unlikely to vanish completely.
“Significant physiological and genetic differences between men and women remain,” explains Colcello. “The future trajectory of medical science is uncertain, but we generally do not anticipate these differences to fully eliminate.”
Managing your period can be challenging if long covid prolongs it.
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Long covid appears to disrupt the menstrual cycle, causing periods to become heavier and last longer. This may be due to hormonal changes or lingering Covid-19-related complications that lead to inflammation.
The reasons behind long COVID remain unclear. Research indicates that the virus may persist at low levels in the body, trigger inflammatory immune responses, or disrupt gut microbiota.
Common symptoms include fatigue and brain fog. Previous studies have linked menstrual cycle irregularities to covid, though they did not provide accurate assessments of menstrual changes or whether these variations are independent of Covid-19.
To address this gap, Dr. Jacqueline Maybin and her team from the University of Edinburgh, UK, enlisted over 12,000 women to participate in a reproductive health study from March to June 2021.
More than 9,000 participants had no history of Covid-19, defined as testing negative for the virus and lacking symptoms such as loss of smell or cough. Approximately 1,700 women reported acute COVID-19, where symptoms resolved within a month, while about 1,000 were identified as having long COVID.
Over half of those with long COVID reported heavier-than-usual periods. In comparison, around 40% of women with acute COVID-19 and 35% of those who had no accidental infection experienced similar issues.
Additionally, long COVID was significantly linked to periods lasting longer than 8 days, whereas acute COVID-19 did not appear to affect cycle length. This suggests prolonged symptoms may stem from long COVID rather than the initial infection.
To understand the underlying mechanisms, researchers analyzed blood samples from menstrual cycles of women with long COVID against those of 40 women who contributed samples pre-pandemic.
Findings showed that individuals with long COVID exhibited elevated levels of the hormone 5α-dihydrotestosterone, which is associated with irregular periods in the latter half of the cycle. Furthermore, higher levels of inflammatory molecules tied to long COVID were detected through biopsies.
This indicates that long COVID may induce hormonal and immune changes that affect menstrual cycles. However, Maybin stresses that further research is essential to clarify these findings.
In another evaluation, the team noted that women with long COVID reported increased symptoms such as fatigue and muscle pain before and during menstruation, while nausea, headaches, and breathing issues often worsened after menstruation and preovulation. “This suggests ovarian hormones might influence the severity of some symptoms,” Maybin explains.
However, since the study primarily involved white women, she emphasizes the need to determine if these results apply to more diverse populations, as all participants were from the UK, a high-income nation.
Recent findings reveal that walking briskly for just 15 minutes daily can significantly lower the risk of premature death, particularly among low-income and Black populations. A study published in the American Journal of Preventive Medicine supports this claim.
Researchers analyzed data from nearly 80,000 participants, discovering that active walking was linked to a 20% decrease in overall mortality rates.
This reduction is especially pronounced for deaths related to cardiovascular issues, demonstrating the distinct advantages of maintaining an active pace, independent of other physical activities.
“While the health benefits of daily walking are well-documented, there has been limited research on how variables like walking speed influence mortality, particularly in low-income and Black/African-American communities,” noted Chief InvestigatorDr. Wei Zheng from Vanderbilt University Medical Center.
“Our study indicates that a brisk 15-minute walk correlates with nearly a 20% reduction in total mortality.”
In comparison, slower walking for over three hours a day is associated with only a modest 4% decline in mortality, indicating that intensity matters.
The participants, primarily low-income and Black individuals across 12 states in the southeastern U.S., reported their average daily “slow” and “fast” walking. Their health outcomes were monitored over a median follow-up period of 16.7 years.
This study suggests that walking enhances cardiovascular efficiency and mitigates risk factors like weight. – Credit: Getty
The advantages of brisk walking persisted even after controlling for other lifestyle factors such as diet, smoking, and alcohol consumption.
Fast walking confers numerous cardiovascular benefits, including improved cardiac function and a reduction in risk factors like obesity, high blood pressure, and high cholesterol.
The researchers emphasized that this activity is low-cost and low-impact, making it accessible to individuals at all fitness levels and an effective intervention in communities with limited healthcare and recreational resources.
To raise awareness, Dr. Lili Liu from the Public Health Campaign and Community Programme stated, “We highlighted the significance and accessibility of brisk walking to enhance health outcomes, and the need to provide resources and support that facilitate easier and faster walking.”
“Individuals should aim to incorporate more intense physical activities into their daily routines,” he added.
Training in Bystander CPR may have played a key role in decreasing heart attack fatalities over the last 50 years
Piyamas Dulmunsumphun / Alamy stock photos
Heart attack fatalities in the US have dramatically decreased over the last five decades, while deaths from chronic heart diseases have surged, potentially due to increased longevity.
“Significant strides have been made in reducing cardiac mortality, and we’re witnessing this transformation,” says Sarah King from Stanford University in California.
She and her team analyzed heart disease mortality data from 1970 to 2022, utilizing the American disease control and prevention database to monitor all recorded deaths nationwide.
In 2022, they discovered that heart disease constituted 24% of all US deaths, a decrease from 41% in 1970, significantly aided by nearly a 90% drop in heart attack fatalities, previously the deadliest form of heart disease.
“We’ve made remarkable progress in reducing heart attack deaths over the past half-century,” remarks King. This includes innovations such as cardiac stents, coronary artery bypass surgery, and cholesterol-lowering therapies. King also believes that public health initiatives, including Bystander CPR training and efforts to decrease smoking rates, have contributed to these improvements.
Nonetheless, the rise in mortality from other types of cardiac ailments has surged by 81%, indicating that many chronic conditions are leading to increased deaths. For instance, fatalities from heart failure, arrhythmias, and hypertensive heart disease have surged by 146%, 106%, and 450%, respectively.
“Many of these issues are related to aging,” explains King. “Those who survive heart attacks seem to live longer, giving them more time to develop these chronic heart conditions.”
However, the statistics might overstate changes in cardiac mortality. “Various factors can lead to a person’s death, resulting in potential misclassification and oversimplification,” King warns. For instance, many patients succumb to heart failure following a heart attack. “It’s not a straightforward issue because the underlying reason for that heart failure is often a blockage in the coronary arteries,” she adds.
Still, the majority of heart disease fatalities aren’t directly caused by heart attacks. “Addressing these other causes of increased mortality will be crucial,” King states. “Discovering healthier aging methods will be the next frontier for heart disease.”
While we acknowledge that reducing greenhouse gas emissions offers a sustainable and long-term solution to climate change, we continue to see rising emissions. As some exacerbate climate challenges, others are exploring options that were once beyond the scope of mainstream discussion.
This article is part of our special issue, showcasing how experts evaluate some of the more unexpected concepts in science. Click here for additional details
The term “geoengineering” broadly refers to human interventions in climate systems aimed at maintaining ecosystems and cooling the planet. Yet, the definition of geoengineering remains elusive; it can encompass endeavors from reforestation to the deployment of massive underwater curtains to support ice sheets.
Some geoengineering concepts spark more debate than others. Large-scale reforestation, when executed properly, is generally seen as a positive climate action. However, more radical ideas—like altering sunlight’s interaction with the Earth’s atmosphere—invoke heightened concerns.
“The risk-return dynamics vary significantly,” states Janice Lachance of the non-profit American Geophysical Union (AGU), which has recently introduced an “Ethical Framework” for scientists in this field. She elaborates, “Planting trees in a park is relatively straightforward and widely accepted. However, when we delve into novel technologies and methodologies, the situation rapidly shifts.”
Take, for example, the concept of solar radiation management (SRM), which proposes reflecting additional sunlight back into space to cool the planet. This can be approached in three fundamental ways (illustrated in the graphics below). Although early modeling suggests that SRM could yield cooling effects within just a few years of implementation, it may also disrupt rainfall patterns and cloud formation.
SRM has historically been a contentious area of research, but as temperatures climb and climate impacts intensify, it has garnered attention from scientists, policymakers, and philanthropists alike.
While some activists argue against this line of research, fearing it diverts focus from the urgency of rapid emission reductions, Andy Parker of the Degree Initiative—a nonprofit concentrating on SRM—cautions that merely reducing emissions may no longer suffice for humanity to tackle climate change’s consequences.
“We must explore strategies to manage the risks posed by previously released greenhouse gases,” he asserts. Moreover, without international dialogue on geoengineering, “there’s a heightened risk of individual nations—especially those severely affected by climate change—unilaterally pursuing geoengineering projects.”
In this context, an increasing number of scientists are advocating for geoengineering research. “Some researchers feel they are falling short in meeting the objectives outlined in the Paris Agreement,” notes Lachance. Consequently, the AGU has devised an ethical framework to guide climate intervention research.
The concerns regarding research extend beyond methodologies. Concepts of planetary-scale geoengineering often place developing nations—particularly those near the equator—at greater risk of unforeseen consequences, such as disruptions to monsoon patterns. Yet, the majority of geoengineering research is concentrated in wealthier countries, which have less to lose.
As part of the Degree Initiative, Parker collaborates with researchers from lower-income countries in the Southern Hemisphere to develop SRM research capabilities. He hopes this will ensure that future deployment decisions take into account the populations most affected. “We don’t hold a stance on whether SRM should be utilized or not,” he explains. “What we do want is for developing nations to have informed avenues for their own research.”
Explore other articles in this series with the links below:
The day on Uranus has been a little longer thanks to a more accurate measurement of its rotation period, which should help scientists plan missions to investigate the gas giant.
Understanding the rotation period of giant planets in the solar system is much more difficult than anything like Mars or Earth, as ferocious wind storms make direct measurements impossible.
The first measurement of Uranus rotation was from the Voyager 2 probe, which took the closest approach on January 24, 1986. Researchers at the time determined that the planet’s magnetic field was 59 degrees from the north of the sky, but the axis of rotation was offset by 98 degrees.
These extreme offsets mean that Uranus effectively “lying down” compared to Earth, while the magnetic pole follows a larger circle as the planet rotates. Researchers at the time found that they completed a full rotation every 17 hours by measuring both the magnetic field and the radio emissions from the aurora.
now, Laurent Ramie The Paris Observatory in France and his colleagues measured it 28 seconds longer. More importantly, their measurements are 1000 times more accurate, reducing the margin of error per second.
Researchers looked at images of Uranus’ ultraviolet aurora taken by the Hubble Space Telescope between 2011 and 2022, and tracked the long-term evolution of the planet’s magnetic poles and circled the axis of rotation.
The error in previous measurements meant that it became impossible to accurately determine the location of Uranus after more than a few years, but the new measurements should be effective for decades. This means that it may depend on calculating mission-critical objectives, such as the probes may orbit and enter the planet’s atmosphere.
Tim Bedding The University of Sydney in Australia calls the team’s measurement techniques “very smart,” but points out that the new period of the day on Uranus doesn’t differ much, and is within the scope of old calculation errors. “That hasn’t changed much,” Bedding says. “Now, the more convenient it is, the more accurate it becomes.”
The Mystery of the Universe: Cheshire, England
Spend a weekend with some of the brightest minds of science. Explore the mystery of the universe in an exciting program that includes an excursion to see the iconic Lovell telescope.
Studies spanning three decades on eight popular diets have pinpointed the ones most likely to promote long-term health since the 1970s.
The Alternative Healthy Diet Index (AHEI) diets have shown slightly superior health benefits compared to the planetary health food index, Mediterranean diet, and healthy plant-based diets.
The AHEI diet focuses on increased consumption of vegetables, fruits, legumes, and nuts while limiting other foods like sugary drinks, red and processed meat, salt, and trans fats. Some meat, fish, and dairy products are allowed in moderation.
Other diets studied had similar characteristics but varied in terms of the amount of permissible meat intake for foods like olive oil, fish, and berries.
“This diet provides all the essential nutrients and food varieties necessary for maintaining a healthy life,” stated corresponding author Dr. Marta Guash Fere, an associate professor at the University of Copenhagen in an interview with BBC Science Focus. “It is a widely recognized dietary pattern focused on disease prevention.”
The study’s healthy diet emphasizes plant foods like vegetables, fruits, legumes, and nuts – Credit: Marcos Elif Castillo Ramirez via Getty
The study conducted by Harvard University’s Chan School of Public Health, Copenhagen University, and the University of Montreal analyzed data from over 105,000 middle-aged nurses and healthcare professionals.
Participants completed meal surveys over 30 years which were scored based on their adherence to eight different dietary patterns.
While only 9.3% of participants were categorized as healthy agers, those closest to the AHEI diet were found to be 86% more likely to reach 70 years of age in good health.
These individuals were also over twice as likely to reach 75 years of age in good health compared to those following diets less similar to the AHEI diet.
Healthy aging was defined as reaching 70 years of age with good cognitive, physical, and mental health without major chronic diseases like heart disease, diabetes, and cancer.
“This research focuses on healthy aging, aiming not just for longevity but for quality of life as well,” explained Guash Ferre. “We are concerned with maintaining overall health in various aspects – physical, cognitive, emotional, and mental.”
The second most effective diet was the Planetary Health Diet Index, promoting both human and environmental health by favoring plant-based diets.
Adherence to any of the eight diets was associated with improved aging, all emphasizing high plant food intake over meat, including vegetables, whole grains, nuts, and legumes.
Though they shared similarities, some diets were variations of the Mediterranean diet focused on longevity, while others were more plant-based or designed for specific purposes like reducing inflammation or safeguarding against cognitive decline.
Guash Ferre noted the intriguing aspect that the diet most conducive to healthy aging includes moderate incorporation of healthy animal-based foods.
She suggested that these proteins might benefit middle-aged and older populations by protecting against conditions like osteoporosis but may not be ideal for younger adults not addressed in the study.
Reduced consumption of ultra-processed foods was linked to improved aging, a finding detailed in Natural Medicine.
Read more:
About our experts:
Dr. Marta Guash Fere is an associate professor at the University of Copenhagen in Denmark and at the Department of Nutrition in Harvard Chan School of Public Health. She holds a PhD in nutritional epidemiology.
Technology may be falsely blamed for lack of sleep
Cavan Images/Getty Images
Unlike our ancestors who lived in technologically advanced times, there is much written about how modern lifestyles mean that we no longer get enough sleep. However, an analysis of 54 sleep studies conducted around the world has shown that people in small, non-industrial societies actually sleep less than people in industrialized communities.
“Everyone I talk about in Canada and the US are talking about how bad their sleep is.” Leela Mackinnon At Toronto Mississauga University, Canada. “The numbers don't show that.”
It is often assumed that the rise of gadgets like big screen televisions and smartphones means that people today are less sleepy than in the recent past.
However, many studies reporting sleep declines over the past few decades are based on asking people how long they spend sleep. This is an unreliable measure. Even using this method, The results are mixedmany studies have found that there is no change or even an increase in sleep duration.
Studies based on more reliable measurements, such as using physical activity monitors and electrodes to monitor brain waves, have not declined over the last few decades. For example, we found a 2016 review of 168 studies. There is no decline Sleep period for the past 50 years.
However, these studies have been conducted in developed countries and reveal the question of whether people had more sleep before industrialisation. Wrist-based activity monitors are now available, making it easier to study sleep in a non-industrial society.
Such studies have revealed an incredible short period of sleep. For example, among hunter-gatherers, Sun sleeps on average 6.7 hours per night, Hatza sleeps 6.2 hours, and Bayaka sleeps 5.9 hours per night. The shortest time ever found is 5.5 hours of sleep in the HIMBA community in Namibia, a herdsman of nomadic livestock.
McKinnon and her colleagues David SamsonUniversity of Toronto, University of Mississauga, is also involved in several such research. They now compare sleep habits in industrialized societies, including the US, Australia and Sri Lanka, with people from small, non-industrial communities, including the Amazon, Madagascar and the Pacific indigenous people.
Overall, the analysis is based on 54 studies that include direct measures of sleep in people over 18 years of age without serious health conditions. In total, only 866 people are involved in these studies, but the dataset is the most comprehensive to date, says Samson. “It's the best now.”
Overall, these individuals slept on average 6.8 hours, while in non-industrial societies the average was 6.4 hours, while in industrial societies it was 7.1 hours.
The two also found that people from the industrial world were asleep for 74% of their time in bed.
McKinnon and Samson also evaluated the regularity of people's circadian rhythms using a measure called the circadian function index, where the score of 1 is perfect. In non-industrialized communities, the average was 0.7 compared to 0.63 in industrial societies.
Samson attributes the higher period of sleep and increased sleep efficiency in industrialized societies to conditions that encourage sleep more. “We see that we have some real benefits from the safety and security of our sleep scene,” he says. “There's no need to dodge the night or predators with rival human groups.”
Conversely, people in industrial areas are less exposed to clues that help to maintain a circadian rhythm, such as low night temperatures and bright daylight exposure. Although they did not appreciate this, both MacKinnon and Samson said that a low normal circadian rhythm would have a negative effect explaining why many people perceive their sleep as poor. I doubt there is a possibility of giving it.
What is not clear from the paper says that individuals in these 54 studies are representatives of the overall population. Nathaniel Marshall At Macquarie University in Sydney, Australia. “Special sampling is required to make a statement about epidemiological prevalence,” he says.
Samson said he looked into whether large sample sizes could change results, and concluded that there was no significant difference.
The Mediterranean diet has been linked to longevity, especially when following the lifestyle of individuals living near medical care facilities in the 1950s.
This diet focuses on a high intake of plant-based foods with limited consumption of fish, meat, and dairy products, often enjoyed in the company of others during meals. Physical activity and a vibrant social life are also key components.
American physiologist Ancel Keys first identified the Mediterranean diet in the 1950s after observing lower rates of heart disease in South Europeans compared to Americans. His research, starting with the Seven Countries Study from 1958 to 1964, explored the relationship between diet, lifestyle, and coronary heart disease across different populations.
The study revealed that men in countries like Italy and Greece had lower rates of coronary heart disease compared to Finland and the United States, with the Cretans from Greece showing the healthiest outcomes. The emphasis was on the protective effects of high unsaturated fats in these diets.
Asparagus plate – Credit: 10,000 hours
In a Spanish study known as PREDIMED (PrevenConconconDIATATERRánea) conducted in 2011, the benefits of a Mediterranean diet in reducing the risk of cardiovascular disease were highlighted.
Further research suggests that this diet can aid in preventing obesity, type 2 diabetes, and certain types of cancer due to its rich nutrient content, including antioxidants like omega-3 fatty acids, potassium, and vitamins C and E. While there is debate over the inclusion of red wine in the diet, its polyphenol content may offer protective effects against oxidative stress and inflammation.
Recent trends in the Mediterranean population show a deviation from traditional diets high in saturated fats and animal proteins towards plant-based proteins, fats, whole grains, and dietary fiber. This shift, along with increased alcohol consumption, sedentary lifestyles, and obesity rates, underscores the importance of returning to ancestral dietary patterns.
This article addresses the question (posed by Len Bird, “Why is the Mediterranean diet beneficial for health?”).
To submit your question, please email questions@sciencefocus.com or reach out on our Facebook, Twitter, or Instagram pages (don’t forget to include your name and location).
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Climate change could increase the frequency and severity of droughts
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Severe, perennial droughts have become hotter, drier, and more extensive since the 1980s. These prolonged droughts, some of which are so extreme that they are classified as ‘megadroughts’, can have particularly devastating effects on agriculture and ecosystems.
Rising temperatures associated with climate change are increasing the risk of drought by making the air warmer, retaining more moisture, and increasing evaporation from the land. Combined with changes in precipitation patterns that lead to reduced rainfall, this could exacerbate droughts and lengthen their duration. This is evidenced by the recent megadrought in parts of North and South America, the worst in 1,000 years.
dark cargar Researchers from the Swiss Federal Institute for Forestry, Snow and Landscape Research identified more than 13,000 droughts lasting at least two years from 1980 to 2018 to uncover long-term trends. They found that the most severe multi-year droughts since the 1980s have become drier and hotter.
Droughts are also affecting wider areas of the planet, with the area affected by the 500 most severe droughts each year expanding by around 50,000 square kilometers each year. “That’s an area larger than Switzerland,” Karger says.
Satellite images showing green areas in drought-affected areas also show some ecosystems turning brown, indicating that dry conditions are having an effect. The most dramatic changes were seen in temperate grasslands, which are more sensitive to changes in water availability, while tropical and boreal forests showed smaller responses.
The researchers have not conducted a formal analysis to define how much anthropogenic climate change is contributing to this trend, but they say the pattern is consistent with the rise in temperatures researchers expect. states. benjamin cook from Columbia University in New York was not involved in the study.
The study highlights that long-term droughts can have consequences as severe as climate disasters such as devastating wildfires or powerful hurricanes, Cook said. “It’s the cumulative effects of drought, both for humans and ecosystems, that really matter.”
In 2003, Hubble provided evidence of giant exoplanets around very old stars. Such stars have only small amounts of the heavy elements that make up planets. This suggests that some planetary formation occurred when our universe was very young, and that those planets had time to form and grow large within the primordial disk, becoming even larger than Jupiter. I am. But how? To answer this question, astronomers used the NASA/ESA/CSA James Webb Space Telescope to study stars in the nearby Small Magellanic Cloud, which, like the early Universe, lacks large amounts of heavy elements. They discovered that not only do some stars there have planet-forming disks, but that those disks are longer-lived than the disks found around young stars in our Milky Way galaxy.
This web image shows NGC 346, a massive star cluster in the Small Magellanic Cloud. Yellow circles superimposed on the image indicate the positions of the 10 stars investigated in the study. Image credits: NASA/ESA/CSA/STScI/Olivia C. Jones, UK ATC/Guido De Marchi, ESTEC/Margaret Meixner, USRA.
“With Webb, we have strong confirmation of what we saw with Hubble, and we need to rethink how we model planet formation and early evolution in the young Universe.” European Space Research Agency said Dr. Guido de Marchi, a researcher at Technology Center.
“In the early universe, stars formed primarily from hydrogen and helium, with few heavier elements such as carbon or iron, and were later born from supernova explosions.”
“Current models predict that because heavy elements are so scarce, the lifetime of the disk around the star is short, so short that in fact planets cannot grow,” said a researcher at NSF's NOIRLab's Gemini Observatory. said lead scientist Dr. Elena Sabbi.
“But Hubble actually observed those planets. So what happens if the model is incorrect and the disks have a longer lifespan?”
To test this idea, the astronomers trained Webb in the Small Magellanic Cloud, a dwarf galaxy that is one of the closest galaxies to the Milky Way.
In particular, they examined the massive star-forming cluster NGC 346, which also has a relative lack of heavy elements.
This cluster served as a nearby proxy for studying stellar environments with similar conditions in the distant early universe.
Hubble observations of NGC 346 since the mid-2000s have revealed that there are many stars around 20 to 30 million years old that are thought to still have planet-forming disks around them.
This was contrary to the conventional idea that such disks would disappear after two or three million years.
“Hubble's discovery was controversial and went against not only the empirical evidence for the galaxy, but also current models,” Dr. De Marchi said.
“This was interesting, but without a way to obtain the spectra of these stars, we will not know whether what we are witnessing is genuine accretion and the presence of a disk, or just an artificial effect. I couldn't actually confirm it.”
Now, thanks to Webb's sensitivity and resolution, scientists have, for the first time, spectra of the formation of Sun-like stars and their surrounding environments in nearby galaxies.
“We can see that these stars are actually surrounded by a disk and are still in the process of engulfing material even though they are relatively old, 20 or 30 million years old,” De Marchi said. Ta.
“This also means that planets have more time to form and grow around these stars than in nearby star-forming regions in our galaxy.”
This discovery contradicts previous theoretical predictions that if there were very few heavy elements in the gas around the disk, the star would quickly blow away the disk.
Therefore, the lifespan of the disk is very short, probably less than 1 million years.
But how can planets form if dust grains stick together to form pebbles and the disk doesn't stay around the star long enough to become the planet's core?
The researchers explained that two different mechanisms, or a combination of them, may exist for planet-forming disks to persist in environments low in heavy elements.
First, the star applies radiation pressure to blow the disk away.
For this pressure to be effective, an element heavier than hydrogen or helium must be present in the gas.
However, the massive star cluster NGC 346 contains only about 10 percent of the heavy elements present in the Sun's chemical composition.
Perhaps the stars in this cluster just need time to disperse their disks.
A second possibility is that for a Sun-like star to form when there are few heavier elements, it would need to start with a larger cloud of gas.
As the gas cloud grows larger, it produces larger disks. Therefore, because there is more mass in the disk, it will take longer to blow it away, even if the radiation pressure is acting the same.
“The more material around the star, the longer the accretion will last,” Sabbi says.
“It takes 10 times longer for the disk to disappear. This has implications for how planets form and the types of system architectures that can be used in different environments. This is very exciting.”
of study Published today on astrophysical journal.
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Guido de Marchi others. 2024. Protoplanetary disks around Sun-like stars appear to live longer when they are less metallic. APJ 977,214;Doi: 10.3847/1538-4357/ad7a63
This article is adapted from an original release by the Webb Mission Team at NASA's Goddard Space Flight Center.
The impacts of climate change are widespread, ranging from biodiversity loss to extreme weather events, rising sea levels, wildfires, and mass human migrations. Each year reveals more about our impact on the environment, with some discoveries more surprising than others.
One of the most shocking revelations to join this list is the recent discovery that our greenhouse gas emissions are altering the Earth’s rotation.
As a result, Earth days are gradually becoming longer, potentially leading to significant changes in how we experience time in the future.
“It’s fascinating how our actions as humans can have such a profound impact on the entire planet through the extensive climate change we’ve triggered over the last century,” says Professor Benedict Soja, a scientist at ETH Zurich who contributed to uncovering this concerning trend.
“This effect may surpass previous significant influences on Earth’s rotation.”
Could we see more hours in a day?
We are familiar with the greenhouse effect, where gases like carbon dioxide trap heat in the Earth’s atmosphere, leading to a rise in temperatures.
Last year, global temperatures were 1.18 degrees Celsius above the 20th-century average, approaching the 1.5 degrees Celsius target set in 2015 as a limit to avoid the worst consequences of climate change.
Record melting of Swiss glaciers in 2022 – Credit: Getty Images
The primary consequence of this warming is the melting of large ice areas in the Arctic and Antarctic, with Switzerland losing 10% of its glacier mass in the last two years, Antarctica shedding 150 billion tons of ice annually, and Greenland losing 270 billion tons.
While many are concerned about the impact of this melting on coastal areas, Soja and his team posed a different question: Will this significant mass redistribution likely prevail? What will be its broad-scale impact on the planet? In a recent study published in the journal Proceedings of the National Academy of Sciences (PNAS), they provided an answer.
“As the ice melts, the Earth’s mass shifts from the polar regions to the oceans,” Soja explained. “This results in the Earth becoming flatter and more oblate, with its mass moving further from the rotation axis.”
Understanding the Mechanism
Similar to any rotating object, the Earth adheres to the law of momentum conservation. Simply put, momentum must be preserved, and it depends on the moment of inertia and rotational speed. As mass moves away from the rotation axis due to melting ice, the moment of inertia increases.
Therefore, to uphold its momentum despite ice melting, the Earth’s rotation slows down, elongating our days.
Soja likens this concept to a figure skater performing a spin, where extending the arms slows down the rotation, while pulling them in speeds it up.
The study indicated that from 1900 to 2000, the climate’s impact on the length of Earth’s day ranged from 0.3 to 1.0 milliseconds per century. Since 2000, accelerated melting has raised this rate to 1.3 milliseconds per century, with a potential increase to 2.6 milliseconds per century by 2100 if emissions remain unchecked.
While these changes may seem small in our daily lives, they could have significant effects on a globally synchronized technological network.
Considerations on Time Management
Three main timescales play crucial roles in timekeeping: International Atomic Time (TAI), Universal Time (UT1), and Coordinated Universal Time (UTC). TAI relies on atomic clocks, UT1 is determined by Earth’s rotation, and UTC synchronizes the two.
Leap seconds were introduced in 1972 to align UTC with UT1 within 0.9 seconds.
Unlike predictable leap years, leap seconds are added irregularly as needed. Since 1972, 27 leap seconds have been added, with the most recent in 2016. Disruptions from leap seconds have caused issues in the digital age, impacting technology companies striving for synchronization.
Atomic clock made in Germany – Credit: Alamy
The recent discovery of Earth’s core slowing down further complicates matters. If the planet’s rotation continues to accelerate, a negative leap second may need to be introduced to UTC. This unprecedented situation poses substantial challenges as systems are unprepared for negative adjustments.
“This has never occurred before, and frankly, I don’t think anyone anticipated it,” Agnew remarked. He compares this scenario to the Y2K scare when concerns about potential computer errors surfaced at the end of the 20th century.
“The critical aspect is that we don’t know the consequences of introducing a negative leap second,” he cautioned. “The negative impacts could be unforeseen.”
According to Agnew, if the effects of climate change had not slowed down, a negative leap second would have been necessary in 2026. “Global warming might postpone negative leap seconds and eliminate their need entirely,” he noted.
While this discovery regarding climate change may offer a positive effect, considering less necessity for negative leap seconds, the implications of further greenhouse gas emissions outweigh any potential benefits. As the situation stands, negative leap seconds may still be required in 2029.
Perhaps it’s time to reconsider the current system?
Agnew proposed a solution to reduce the required precision between timescales, eliminating the need for negative leap seconds and allowing for more predictable positive adjustments.
“It could resemble a leap year. You add a fixed number of seconds at a specific time and accept that it may not be exact but is tolerable,” suggested Agnew.
This proposition aligns with the dominance of slowing over longer timescales, rather than the complex interactions involving Earth’s core or ice melting.
Efforts are reportedly underway to implement this system, with a target to eliminate the need for leap seconds by 2035. However, international agreement hurdles must be overcome. Failure to adapt before requiring a negative leap second could lead to unprecedented chaos, highlighting the urgency of the situation.
Meet the Experts
Benedict Soja: Assistant Professor in the Department of Civil, Environmental, and Geoengineering at ETH Zurich.
Duncan Agnew: Professor Emeritus at Scripps Institution of Oceanography, specializing in crustal deformation measurement and geophysical data analysis.
Time flies: If your days seem to fly by with meetings, phone notifications, and caffeine breaks, rest assured, you’re not alone. This concept traces back to the writings of the Roman poet Virgil over 2000 years ago.
Last year, a study found that many people felt there simply isn’t enough time in the day to accomplish everything. It often feels like time is rushing by at an unstoppable pace.
However, a recent study from George Mason University in the US sheds light on how to slow down time. The research explores the phenomenon of time dilation, where our perception of time is stretched and slowed.
The study delves into whether certain images, experiences, and scenarios can make us feel like we’re spending more time on them than we actually are. The more memorable an image is, the more likely we are to believe we are viewing it for longer than we really are.
The lead researcher, Professor Martin Wiener, explains that our brains may delay the perception of time to gather more information from the moment. This poses an intriguing question: can we mentally slow down time to live more in the present and elongate enjoyable experiences?
Our subjective perception of time is dynamic, as various factors can influence how time appears to pass. For individuals with impulsivity or ADHD, time may seem to move faster, while experiencing “flow” can create the sensation of time slowing down during engaging activities.
Wiener emphasizes the importance of seeking novel experiences to expand our sense of time and enhance our memory. By immersing ourselves in new hobbies, places, subjects, and interactions, we can make better use of our time and feel like we’re living in a state of artificial slow motion.
About our experts
Professor Martin Wiener: An associate professor at George Mason University, Wiener leads a lab that investigates how the brain processes time and space. His research spans areas such as mapping the human brain, neuroimaging, and neuroscience journals.
TThe business casual revolution of the 1990s and the rise of the tech billionaires in the early 2000s are said to have ushered in a new era of liberating employees from the shackles of dress codes. Mark Zuckerberg transformed the hoodie and jeans into a symbol of the new economy meritocracy, the uniform of genius hackers that would shake up the traditional industrial coat-and-tie aesthetic of the East. In the digital economy, many imagined, the most successful companies would allow their talented employees to wear whatever they wanted while splashing around in colorful ball pools.
But as Facebook engineer Carlos Bueno wrote in a 2014 blog post: Inside the MiratocracyIn the 1960s, we simply replaced the rigid dress code with a slightly less rigid one. The new world is actually not so free. The cognitive dissonance is clear in the faces of recruiters who pretend that clothing is no big deal, yet are clearly disappointed when they show up to an interview in a dark worsted business suit. “You are expected to conform to the rules of your culture before you can demonstrate your true worth,” Bueno writes. “What wearing a suit actually signals, and I don't mean this as a myth, is non-conformism, one of the most serious sins.”
As the rich get fabulously rich, they seem to become even more determined to look as plain as possible.
This reality was on full display earlier this month at the Sun Valley Conference, better known as “summer camp for billionaires.” Since the tradition began in 1984, organizers have been gathering the wealthiest and most influential people for the multi-day conference. A treasure trove of top CEOs, tech entrepreneurs, billionaire investors, media moguls, and more convene at the invitation-only meeting to privately decide the future of the world.
This year's attendees included Jeff Bezos, who continues his incredible transformation from nerd to muscle man. Looking like a successful SoulCycle instructor, he strolled around the resort grounds layered with pearl grey jeans, a skin-tight black T-shirt, and a multitude of colorful bracelets (possibly from the American luxury brand David Yurman).
Jeff Bezos at Amazon's Seattle offices on May 2, 2001, and with his girlfriend Lauren Sanchez at a meeting in Sun Valley, Idaho on July 11, 2024. Composition: AP, Reuters
Warner Bros. CEO David Zaslav tried to at least bring some style to the event, donning a brown corduroy trucker jacket, slim-legged blue jeans, smart white sneakers, and a white bandana around his neck. But most of the men in attendance were dressed in scruffy polos, T-shirts, and simple button-down shirts. Billionaire OpenAI CEO Sam Altman looked like he was at freshman orientation in a plain gray T-shirt, blue jeans, and a black backpack slung over each shoulder.
This is not necessarily a bad outfit – many of them are – but one wonders if something has been lost in the move away from coats and ties. A few generations ago, men of this social class would have worn something more visually interesting. In the 1930s, Apparel Arts, a leading men's fashion trade magazine that advises men on how to dress for different environments, recommended the following for resort wear: a navy double-breasted sport coat with a polka-dot scarf and high-waisted trousers in Cannes; a mocha linen beach shirt and wide-cut slacks with self-strap fastenings on the Côte d'Azur; and a white shawl-collar dinner jacket with midnight blue tropical worsted trousers and a white silk dinner shirt for semi-formal evening wear.
The advantage of these clothes is not so much about appearances or elegance, but rather the way they create a unique silhouette. The tailored jacket is particularly useful in this regard. Made from layers of haircloth, canvas, and padding, pad-stitched together and shaped with darts and expert pressing, the tailored jacket creates a flattering V-shape without having one. That silhouette is why Stacey Bendet, founder of fashion company Alice & Olivia, is always the most stylish person at these conferences (this year, she wore flared pants, a long leather coat, giant sunglasses, and a Western-wear hat, each element creating a unique shape). In contrast, Tim Cook's basic polo shirts and slim jeans did little to replicate his physical build.
To me, dressing like this, surrounded by guys in t-shirts and sloppy polo shirts, is pretty funny, and honestly, thank god people like this exist. pic.com/Jaraz4d8XB
In his book Distinction, Pierre Bourdieu correctly recognizes that the notion of “good taste” is merely a habit or taste of the ruling class. He is, of course, not the first to make this observation. In the early 20th century, German sociologist Georg Simmel noted that people often use fashion as a form of class differentiation. According to Simmel, style spreads downward as the working class imitates those deemed socially superior, at which point members of the ruling class move on to another class. But the publication of Distinction in 1979, based on Bourdieu's empirical research from 1963 to 1968, stands out, especially for its understanding of men's style. At the time, the coat and tie was in decline. By the time the book was translated into English in 1984, the suit was drawing its last breath before the rise of casual Fridays, tech entrepreneurs, and remote work would change men's dress forever.
Today's ruling class is hardly inspiring in terms of taste. The preponderance of tech vests replacing navy blazers shows that socioeconomic class still dictates dress habits, even if the style is less appealing. Ironically, while the elite are increasingly dressing like the middle class who go shopping at Whole Foods Market, wealth inequality in the United States has worsened roughly every decade since the 1980s, the last time men were still expected to wear tailored jackets.
To be honest, Jensen Huang was shining: he discovered the power of the jacket, he discovered the uniform (black leather jacket), and also, his tailoring seems pretty good. pic.com/ryjCqD1uaI
If there's a silver lining to all this, it's that the history of clothing in the 20th century is about how influences changed. As the century progressed, men began to receive dress dictates from different social classes, not just those with economic or political power: artists, musicians, and workers. Many of the more provocative fashion moments of this period were about rebellious youth taking a stance of rebellion against the establishment. These included swing kids and hip-hop, bikers, rockers, outlaws, beats and beatniks, modernists and mods, drag and dandies, hippies and bohemians. In recent years, Zuckerberg and Bezos have made an effort to move away from the fleece uniform, and Nvidia CEO Jensen Huang looks pretty stylish in a head-to-toe black uniform that includes a variety of leather jackets. But for the most part, today it's better to look elsewhere for dress dictates. The ruling class may shape our world, but don't let them shape your outfit.
Looking to age gracefully? There’s a plethora of advice out there, but the key seems to lie in maintaining a healthy diet.
A recent study published in Nutrition 2024 revealed that only a small fraction of individuals manage to remain disease-free and in good physical, cognitive, and mental health past the age of 70.
However, there’s hope. The same study indicated that adopting a healthy and balanced diet during midlife can significantly increase your chances of healthy aging.
The study, which spanned over 30 years and analyzed data from over 100,000 individuals, showed that people who maintained a healthy diet from their 40s onwards were much more likely to be in good physical shape at age 70.
According to John Myers, a postdoctoral researcher at the Harvard School of Public Health, “People who followed a healthy diet in midlife, especially one rich in fruits, vegetables, whole grains, and healthy fats, were significantly more likely to experience healthy old age.” This underscores the impact of diet on our health as we age.
To enhance your chances of living a longer and healthier life, experts recommend increasing consumption of fruits, vegetables, whole grains, unsaturated fats, nuts, legumes, and low-fat dairy products. Conversely, it’s wise to limit intake of trans fats, sodium, red meat, and processed meats.
While a healthy diet is typically associated with disease prevention, this study highlights its role in promoting healthy aging. It’s not just about avoiding illness; it’s about maintaining overall vitality as we age.
Researcher Angelie Tessier noted, “Our study suggests dietary recommendations for healthy aging should not only focus on preventing diseases but also on fostering a fulfilling life in later years.”
Participants in the study were mainly above 39 years old without chronic diseases at the onset, and they reported their dietary habits every four years. By 2016, nearly half of the participants had passed away while only a small percentage had reached age 70 or older in good health.
When comparing adherence to healthy eating patterns, the study found that individuals in the top group were significantly more likely to achieve healthy aging than those in the bottom group. The strongest correlation was with the Alternative Healthy Eating Index, which rates your diet based on food consumption frequency.
Even after accounting for factors like physical activity, the link between diet and healthy aging remained robust. Healthy eating habits were associated with better physical health, cognitive function, and mental well-being.
About the Experts
Angelie Tessier, a postdoctoral researcher at the Harvard School of Public Health, has research published in esteemed journals like Nature Communications and PLoS One.
Slowing down isn’t typically a priority for runners. From elite athletes to casual runners, the focus is usually on speed, personal records, competition, and pushing limits.
However, the concept of slow running has gained popularity recently. It’s not just a trend promoted by social media influencers, but also endorsed by coaches, runners, and scientists.
What are the benefits of running slowly?
The idea is that running at a slower pace can actually yield faster results in terms of exercise benefits.
“For example, running slowly can lower your resting blood pressure and strengthen your heart,” says Professor Dan Gordon. “It still challenges the body but without the need for excessive stress to achieve cardiovascular improvements,” adds Jonathan Myers, an exercise physiologist at Anglia Ruskin University.
Running slowly is typically defined as a pace where you can comfortably hold a conversation. It’s an effort level of 4 or 5 on a scale of 1 to 10, with 10 being a sprint. This type of exercise, known as “Zone 2 exercise” in sports science, is considered to be a sweet spot for promoting longevity and overall health.
A study in Copenhagen found that light and moderate joggers had lower mortality rates than non-runners and intense runners. Vigorous joggers did not show significantly different mortality rates from non-runners.
Running slowly is beneficial for heart health, enhances metabolic functions, and improves mental well-being. It can prevent metabolic diseases, improve insulin sensitivity, and boost mitochondrial density in cells, leading to improved energy utilization.
Improved mental and physical health
Slow runners experience faster recovery, reduced risk of overtraining-related fatigue and injuries, and generally feel better overall.
“Slow running has a positive impact on mental health and social well-being,” says Gordon. “It allows for social interactions, which can motivate individuals to stay active and enjoy the process without pressure to perform.”
What we’re starting to realize is that you don’t need intense stress on your body to see cardiovascular benefits.
Gordon believes promoting slow running in groups can encourage more people to stay active consistently, as the social support can enhance motivation and enjoyment of the activity.
More Gains, Less Pain
Contrary to the belief that speed is essential for improvement, researchers suggest that slow running can yield significant results. Elite runners, for example, often perform majority of their training at a slow pace to build a strong aerobic base and enhance cardiovascular efficiency.
This concept of an “Aerobic Base” emphasizes the importance of improving cardiovascular capacity to enhance overall running performance. By running slowly, you can increase endurance, speed, and efficiency while reducing exertion.
In summary, slowing down not only improves longevity but also enhances running abilities in the long run.
read more:
About our expert, Professor Dan Gordon
Dan Gordon is an Associate Professor at the Health and Technology Research Centre, Anglia Ruskin University, South East England. With over 20 years of experience in sports physiology, he specializes in endurance physiology assessment.
An analysis of all heatwaves around the world between 1979 and 2020 found that they now last an average of 12 days, compared to eight days at the start of the study.
As the Earth continues to heat, they will last even longer, says Zhang Wei at Utah State University. “Based on trends, by around 2060 it could double to 16 days,” he says.
Zhang’s team found that heat waves not only last much longer, but also become more frequent and progress more slowly. This means that certain locations have to endure heat wave conditions more frequently and for longer.
Although heat waves are typically thought of as phenomena that affect one region, the areas affected by heat waves change over time as the weather systems responsible for the hot conditions move.
According to the research team, the speed of heat waves has slowed from around 340 kilometers per day in the 1980s to around 280 kilometers per day today. Moreover, the rate of deceleration is accelerating.
Because heat waves last longer, they reach farther, albeit at lower average speeds, increasing the total distance from about 2,500 kilometers to about 3,000 kilometers. This means that a wider area is affected.
The study did not consider the causes of this trend. However, with global warming, heat waves will become more frequent, slower moving, and last longer, meaning they will be more devastating to society and nature than ever before, unless action is taken to prevent further warming. The research team warns that this could have a negative impact.
Most previous studies on heat waves focused on specific locations or regions. Zhang’s team is one of the few that can observe how heat waves move over time.
To do this, the team divided the world into grids. A heat wave is defined as one or more grid rectangles that significantly exceed the average temperature from 1981 to 2010, specifically, temperatures exceeding 95 percent of the temperatures for that period for three or more days. it was done.
The research team found that heat waves tend to move in certain directions depending on prevailing conditions. For example, heat waves in Australia tend to move more south-east, while in Africa they tend to move west.
“I think it’s really interesting to be able to see all the properties of heat waves that you can’t capture if you consider them statically,” he says. andrea beenish He was involved in one of the few other studies at the Ludwig-Maximilians University in Munich, Germany. Seeing heat waves as moving systems.
But when thinking about what we need to do to adapt to a hotter world, regional assessments can be more helpful than global ones, Beinisch says.
She also points out that, for example, heatwave persistence numbers depend largely on how the team defines a heatwave. Even with different definitions, the overall trend remains the same, but the numbers can change significantly. “This needs to be taken into account when looking at the exact numbers,” she says.
Other studies also show that hurricanes move more slowly, he says. david keelings at the University of Florida.
“In short, this means that these incredibly dangerous events last longer in one place and the impact is felt more strongly. In general, the longer a population is exposed to heatwave conditions, the more likely they are to be hospitalized. higher rates and higher mortality rates,” he says.
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