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Heat, Disease, Air Pollution: How Climate Change Impacts Health

Air pollution, such as the extremes seen in India's capital New Delhi, are just one way that fossil fuels affect human health. Arun SANKAR / AFP/File
Air pollution, such as the extremes seen in India's capital New Delhi, are just one way that fossil fuels affect human health. Arun SANKAR / AFP/File
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Heat, Disease, Air Pollution: How Climate Change Impacts Health

Air pollution, such as the extremes seen in India's capital New Delhi, are just one way that fossil fuels affect human health. Arun SANKAR / AFP/File
Air pollution, such as the extremes seen in India's capital New Delhi, are just one way that fossil fuels affect human health. Arun SANKAR / AFP/File

Growing calls for the world to come to grips with the many ways that global warming affects human health have prompted the first day dedicated to the issue at crunch UN climate talks starting next week.
Extreme heat, air pollution and the increasing spread of deadly infectious diseases are just some of the reasons why the World Health Organization has called climate change the single biggest health threat facing humanity.
Global warming must be limited to the Paris Agreement target of 1.5 degrees Celsius "to avert catastrophic health impacts and prevent millions of climate change-related deaths", according to the WHO.
However, under current national carbon-cutting plans, the world is on track to warm up to 2.9C this century, the UN said this week.
While no one will be completely safe from the effects of climate change, experts expect that most at risk will be children, women, the elderly, migrants and people in less developed countries which have emitted the least planet-warming greenhouse gases.
On December 3, the COP28 negotiations in Dubai will host the first "health day" ever held at the climate negotiations.
- Extreme heat -
This year is widely expected to be the hottest on record. And as the world continues to warm, even more frequent and intense heatwaves are expected to follow.
Heat is believed to have caused more than 70,000 deaths in Europe during summer last year, researchers said this week, revising the previous number up from 62,000.
Worldwide, people were exposed to an average of 86 days of life-threatening temperatures last year, according to the Lancet Countdown report earlier this week.
The number of people over 65 who died from heat rose by 85 percent from 1991-2000 to 2013-2022, it added.
And by 2050, more than five times more people will die from the heat each year under a 2C warming scenario, the Lancet Countdown projected.
More droughts will also drive rising hunger. Under the scenario of 2C warming by the end of the century, 520 million more people will experience moderate or severe food insecurity by 2050.
Meanwhile, other extreme weather events such as storms, floods and fires will continue to threaten the health of people across the world.
Air pollution
Almost 99 percent of the world's population breathes air that exceeds the WHO's guidelines for air pollution.
Outdoor air pollution driven by fossil fuel emissions kills more than four million people every year, according to the WHO.
It increases the risk of respiratory diseases, strokes, heart disease, lung cancer, diabetes and other health problems, posing a threat that has been compared to tobacco.
The damage is caused partly by PM2.5 microparticles, which are mostly from fossil fuels. People breathe these tiny particles into their lungs, where they can then enter the bloodstream.
While spikes in air pollution, such as extremes seen in India's capital New Delhi earlier this month, trigger respiratory problems and allergies, long-term exposure is believed to be even more harmful.
However it is not all bad news.
The Lancet Countdown report found that deaths from air pollution due to fossil fuels have fallen 16 percent since 2005, mostly due to efforts to reduce the impact of coal burning.
Infectious diseases
The changing climate means that mosquitoes, birds and mammals will roam beyond their previous habitats, raising the threat that they could spread infectious diseases with them.
Mosquito-borne diseases that pose a greater risk of spreading due to climate change include dengue, chikungunya, Zika, West Nile virus and malaria.
The transmission potential for dengue alone will increase by 36 percent with 2C warming, the Lancet Countdown report warned.
Storms and floods create stagnant water that are breeding grounds for mosquitoes, and also increase the risk of water-borne diseases such as cholera, typhoid and diarrhea.
Scientists also fear that mammals straying into new areas could share diseases with each other, potentially creating new viruses that could then jump over to humans.
Mental health
Worrying about the present and future of our warming planet has also provoked rising anxiety, depression and even post-traumatic stress -- particularly for people already struggling with these disorders, psychologists have warned.
In the first 10 months of the year, people searched online for the term "climate anxiety" 27 times more than during the same period in 2017, according to data from Google Trends cited by the BBC this week.

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Heavy Snow in Poland Leaves Drivers Stranded in Tailbacks of up to 20 Km

Cars drive on a road during heavy snowfall in central Warsaw, Poland, 30 December 2025. (EPA)
Cars drive on a road during heavy snowfall in central Warsaw, Poland, 30 December 2025. (EPA)
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Heavy Snow in Poland Leaves Drivers Stranded in Tailbacks of up to 20 Km

Cars drive on a road during heavy snowfall in central Warsaw, Poland, 30 December 2025. (EPA)
Cars drive on a road during heavy snowfall in central Warsaw, Poland, 30 December 2025. (EPA)

Heavy snowfall in Poland caused tailbacks stretching as far as 20 km (12.43 miles) on a motorway between ​the capital Warsaw and the Baltic port city of Gdansk during the night, police said on Wednesday.

While the situation left hundreds of people trapped in their cars in freezing conditions, by the early hours of ‌Wednesday morning traffic ‌was moving again, ‌according ⁠to ​police.

"The ‌difficult situation began yesterday after 4 p.m., when the first trucks on the S7 route... began having trouble approaching the slopes," said Tomasz Markowski, a spokesperson for police in the northern city of ⁠Olsztyn.

"This led to a traffic jam stretching approximately ‌20 kilometers overnight." Deputy Infrastructure Minister ‍Stanislaw Bukowiec ‍told a press conference that nobody had ‍been hurt as a result of the difficult situation on the roads.

Anna Karczewska, a spokesperson for police in Ostroda, said officers had ​tried to help drivers who found themselves stuck. Ostroda lies on ⁠the highway about 40 km west of Olsztyn.

"We helped as much as we could, and we had coffee and hot tea for the drivers, which the Ostroda City Hall had prepared for us," she said.

State news agency PAP reported that there had also been some disruption to railways and airports, ‌but that services were returning to normal.

Varieties

Infant Screen Exposure Shapes Long-Term Brain Changes and Teen Anxiety, Study Finds  

The study concluded that children exposed to high levels of screen time before age two are exposed to endure adolescent mental health. (The University of Queensland)
The study concluded that children exposed to high levels of screen time before age two are exposed to endure adolescent mental health. (The University of Queensland)
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Infant Screen Exposure Shapes Long-Term Brain Changes and Teen Anxiety, Study Finds  

The study concluded that children exposed to high levels of screen time before age two are exposed to endure adolescent mental health. (The University of Queensland)
The study concluded that children exposed to high levels of screen time before age two are exposed to endure adolescent mental health. (The University of Queensland)

Children exposed to high levels of screen time before age two showed changes in brain development that were linked to slower decision-making and increased anxiety by their teenage years, according to new study released by the Agency for Science, Technology and Research in Singapore.

Prepared in collaboration with the National University of Singapore (NUS) Yong Loo Lin School of Medicine, the study focuses on infancy, a period when brain development is most rapid and especially sensitive to environmental influences.

The amount and type of screen exposure in infancy are largely determined by parental and caregiver awareness and parenting practices, highlighting a critical window for early guidance and intervention, showed the study, published in eBioMedicine on Tuesday.

It said the researchers followed 168 children before age two and conducted brain scans at three time points (ages 4.5, 6, and 7.5), which allowed them to track how brain networks developed over time rather than relying on a single snapshot.

Children with higher infant screen time showed an accelerated maturation of brain networks responsible for visual processing and cognitive control.

The researchers suggest this may result from the intense sensory stimulation that screens provide. Notably, screen time measured at ages three and four did not show the same effects, underscoring why infancy is a particularly sensitive period.

The study showed that children with high screen exposure, the networks controlling vision and cognition specialized faster, before they had developed the efficient connections needed for complex thinking. This can limit flexibility and resilience, leaving the child less able to adapt later in life.

It said this premature specialization came at a cost: children with these altered brain networks took longer to make decisions during a cognitive task at age 8.5, suggesting reduced cognitive efficiency or flexibility.

Those with slower decision-making, in turn, reported higher anxiety symptoms at age 13. These findings suggest that screen exposure in infancy may have effects that extend well beyond early childhood, shaping brain development and behavior years later.

In a related study, the same team found that infant screen time is also associated with alterations in brain networks that govern emotional regulation — but that parent-child reading could counteract some of these brain changes.

Researchers found that their results give a biological explanation for why limiting screen time in the first two years is crucial.

“But it also highlights the importance of parental engagement, showing that parent-child activities, like reading together, can make a real difference,” said Asst Prof Tan Ai Peng, Clinician-Scientist at NUS, and the study's senior author.

The study concluded that children exposed to high levels of screen time before age two are exposed to endure adolescent mental health, particularly on cognitive performance and anxiety levels.

Varieties

Indonesia Raises Alert for Mount Bur Ni Telong Volcano after Spike of Activity

Explosive activity concentrates at the north-east crater of the Mount Etna, as an eruption started on Dec. 24 continues, in Sicily, Italy, Monday Dec. 29, 2025. (AP Photo/Salvatore Allegra)
Explosive activity concentrates at the north-east crater of the Mount Etna, as an eruption started on Dec. 24 continues, in Sicily, Italy, Monday Dec. 29, 2025. (AP Photo/Salvatore Allegra)
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Indonesia Raises Alert for Mount Bur Ni Telong Volcano after Spike of Activity

Explosive activity concentrates at the north-east crater of the Mount Etna, as an eruption started on Dec. 24 continues, in Sicily, Italy, Monday Dec. 29, 2025. (AP Photo/Salvatore Allegra)
Explosive activity concentrates at the north-east crater of the Mount Etna, as an eruption started on Dec. 24 continues, in Sicily, Italy, Monday Dec. 29, 2025. (AP Photo/Salvatore Allegra)

Indonesian authorities have raised the alert level for the Mount Bur Ni Telong volcano in the country’s westernmost province of Aceh to its second highest following a series of increased activity and volcanic earthquakes, official said Wednesday.

The 2,624-meter (8,600-foot) stratovolcano in Aceh's Bener Meriah regency recorded at least seven earthquakes on Tuesday evening that were felt about five kilometers (three miles) away, while seismographs also detected seven shallow volcanic earthquakes along with 14 deep quakes and two tectonic quakes, said Lana Saria, the acting head of the Geological Agency at Energy and Mineral Resources Ministry.

She said based on the results of visual and instrumental monitoring which show the occurrence of increased volcanic activity for Mount Bur Ni Telong, scientists raised the alert level from the third to the second highest level Tuesday evening.

“Aftershocks following local tectonic events indicate magma activity is easily triggered by tectonic disturbances,” Saria said, adding that the increase in seismic activity has been ongoing since July and became more intense and shallow in the past two months.

According to The Associated Press, the agency's visual monitoring showed the volcano clearly visible with no crater smoke. However, she warned of possible eruption, including phreatic blasts and hazardous volcanic gases near areas with fumaroles and solfataras, openings in the Earth’s crust that emit steam and gases.

Authorities urged residents and visitors to stay at least 4 kilometers (2.4 miles) from the crater and avoid fumarole and solfatara zones during cloudy or rainy weather because gas concentrations can be life-threatening.

The heightened alert came as the Bener Meriah area is still recovering from catastrophic floods and landslides earlier this month that struck 52 cities and regencies on Sumatra island, leaving 1,141 people dead with 163 residents still missing and more than 7,000 injured, the National Disaster Management Agency said. In Bener Meriah alone, 31 people died and 14 are still missing after the floods and landslides hit the regency, disrupting access to remote villages and displacing more than 2,100 residents.

Local media said people living in three villages within a 2-kilometer (1.2-mile) radius from the crater are being evacuated as officials fear that heavy rains combined with volcanic activity could worsen conditions and complicate evacuation efforts.

Indonesia, an archipelago of more than 280 million people, has over 120 active volcanoes. It is prone to volcanic activity because it sits along the “Ring of Fire,” a horseshoe-shaped series of seismic fault lines around the Pacific Ocean.