Health
Climate Change Poses Growing Threat to Blood Supply and Demand, Australian Study Warns
Climate change is poised to significantly disrupt both the supply and demand of blood for transfusions, according to a new study conducted by researchers from Red Cross Lifeblood and the University of the Sunshine Coast (UniSC). Published in The Lancet Planetary Health, the study outlines how increasing temperatures, extreme weather events, and the spread of infectious diseases could upend the current blood donation system.
The research highlights a dual threat: a shrinking pool of eligible blood donors due to health impacts and climate-induced disruptions, coupled with a rising demand for blood in disaster and disease-stricken areas.
“Climate change may impact some infectious diseases that can be transmitted via blood and can prevent people from donating,” said Dr. Elvina Viennet, one of the study’s co-authors. She emphasized that blood-borne illnesses such as Dengue Fever, West Nile Virus, and Malaria—driven by rising temperatures and increased rainfall—are becoming more prevalent in regions like Europe, affecting donor eligibility.
Currently, an estimated 25 million blood units are transfused each year across Europe. Blood is essential for a wide range of medical treatments, including surgeries, trauma care, managing chronic conditions, and supporting premature infants. However, disruptions in donor availability or blood storage due to climate extremes could pose serious risks.
“Extreme weather events can limit the mobility of people, disrupt transportation networks, and compromise blood storage conditions,” Viennet added. “This is particularly concerning because blood has a short shelf life and requires carefully regulated conditions.”
Helen Faddy, associate professor at UniSC and the study’s lead author, noted that climate-related health issues may further limit the pool of potential donors. “We could see new diseases emerge, and other health challenges such as blood pressure changes, dehydration from heatwaves, and psychological distress linked to climate anxiety that may affect individuals’ ability to donate,” she said.
Moreover, the study warns that the need for blood transfusions could also increase. Factors such as pregnancy complications, cardiovascular disease, and the rising incidence of sickle cell disease—conditions potentially exacerbated by climate change—may drive higher demand.
To mitigate these risks, the researchers propose several strategies, including the development of flexible and mobile blood collection centers, the use of cell salvage or autotransfusion techniques, and enhanced international collaboration to ensure a resilient and diverse blood supply.
“With rising sea levels and climate-related displacement likely to increase global migration, it’s vital to boost blood donation from a wider range of ethnic backgrounds,” Faddy stressed. “Encouraging more people to donate blood is a public health priority as climate impacts grow.”
The study serves as a call to action for health authorities worldwide to adapt blood donation systems in the face of escalating environmental challenges.
Health
World Cup Emotion Can Strain the Heart, Cardiologists Warn Fans at Risk
As the World Cup begins, medical experts are cautioning football fans with underlying heart conditions that the emotional intensity of matches can place unexpected strain on the cardiovascular system.
Cardiologists say that the excitement, tension, and anxiety generated during high-stakes games can trigger physical reactions similar to intense exercise, raising heart rate, blood pressure, and stress hormones.
“Intense emotions, whether positive or negative, can act as ‘precipitating risk factors’ for cardiovascular events such as heart attack,” said Paola Santalucia, a cardiologist and board member of the European Heart Network.
She explained that moments of extreme excitement, such as a decisive penalty shootout or a last-minute goal, may pose risks for people already living with heart disease. Those with additional risk factors, including hypertension, obesity, or smoking habits, are also advised to be cautious during emotionally charged matches.
Research using wearable devices has shown that during major football events, some fans experience heart rates climbing as high as 150 beats per minute. That level is comparable to sprinting and reflects how strongly the body reacts to emotional stress.
A study examining supporters during the 2025 German Cup final found that even watching from home can significantly affect physiological responses. “They still had an increase in heart rate that compares to walking, even though they didn’t walk,” said Christian Deutscher, professor of sports economics at Bielefeld University and co-author of the study.
He noted that the most intense reactions often occur not during goals themselves, but during moments of uncertainty such as VAR checks, penalty shootouts, or shots striking the post. These unpredictable situations, he said, are what drive the strongest emotional and physical responses among fans.
Deutscher also pointed out that stadium spectators may experience even greater strain due to environmental factors such as heat and alcohol consumption.
However, experts emphasize that football itself is not inherently dangerous. Instead, it is the body’s natural response to excitement that can create temporary stress.
“The adrenergic stimulation is at its max: extreme high blood pressure, high heart rate, and adrenaline, cortisol, skyrocketing,” said Dan Atar, professor of cardiology at Oslo University Hospital. In rare cases, he added, this surge can contribute to the rupture of arterial plaque in vulnerable individuals, potentially leading to a heart attack.
Atar stressed that such events can occur in everyday situations as well, including physical exertion like shoveling snow. “It is in no way dangerous to watch a football game,” he said. “All this is physiologic. It’s not dangerous to be excited.”
Still, he acknowledged that combining emotional stress with alcohol, heat, and pre-existing conditions can increase risk for some viewers.
Doctors advise those at higher risk to continue prescribed medications, limit alcohol intake, avoid smoking, and watch for warning signs such as chest pain or irregular heartbeat.
“The key message is not to avoid enjoying the match, but to do so with moderation and awareness,” Santalucia said.
Health
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Health
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