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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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Sudan's Historic Acacia Forest Devastated as War Fuels Logging

Little is left of the once sprawling acacia forest south of Sudan's capital. Ebrahim Hamid / AFP
Little is left of the once sprawling acacia forest south of Sudan's capital. Ebrahim Hamid / AFP
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Sudan's Historic Acacia Forest Devastated as War Fuels Logging

Little is left of the once sprawling acacia forest south of Sudan's capital. Ebrahim Hamid / AFP
Little is left of the once sprawling acacia forest south of Sudan's capital. Ebrahim Hamid / AFP

Vast stretches of a once-verdant acacia forest south of Sudan's capital Khartoum have been reduced to little more than fields of stumps as nearly three years of conflict have fueled deforestation.

What was once a 1,500-hectare natural reserve has been "completely wiped out", Boushra Hamed, head of environmental affairs for Khartoum state, told AFP.

Al-Sunut forest had long served as a haven for migratory birds and a vital green shield against the Nile's seasonal floods.

"During the war, Khartoum state has lost 60 percent of its green cover," Hamed said, describing how century-old trees "were cut down with electric saws" for commercial timber and charcoal production.

Where tall acacias once cast cool shade over a wetland just upstream from the confluence of the Blue and White Nile, barren ground now lies exposed, criss-crossed by people gathering whatever wood remains.

Hamed called it "methodical destruction", though the perpetrators remain unknown and there has been no investigation.

Similar devastation is unfolding across several regions -- including western Darfur, neighboring Kordofan and the central states of Sennar and Al-Jazirah -- as insecurity and economic collapse drive unchecked logging, according to Sudan's Forests National Corporation.

According to a 2019 study by the Nairobi-based African Forest Forum, Sudan had already lost nearly half of its forested land since 1960 due to agricultural expansion, firewood collection and overgrazing.

By 2015, the country ranked among Africa's least forested nations, with around 10 percent of its territory still covered by woodland, the study said.

The report had also warned of further degradation if reforestation and sustainable management efforts were not implemented -- concerns now compounded by the ongoing conflict.

- 'Barrier' -

Aboubakr Al-Tayeb, who oversees Khartoum's forestry administration, said the damage "affects not only Khartoum, but Sudan and the wider African continent."

"The forest was home to several migratory species from Europe," he told AFP.

More than a hundred bird species, including ducks, geese, terns, ibis, herons, eagles and vultures, had been recorded in the area, alongside monkeys and small mammals.

Al-Nazir Ali Babiker, an agronomist, said the loss of tree cover could cause more severe seasonal flooding because the "forest acted as a barrier" against rising waters.

Flooding strikes Sudan every year, destroying homes, farmland and infrastructure and leaving many families with no choice but to flee to safer areas.

The war in Sudan, which erupted in April 2023, has already killed tens of thousands, displaced 11 million and shattered critical infrastructure.

Before the fighting, forests supplied roughly 70 percent of Sudan's energy consumption, primarily through charcoal and firewood, according to data from the African Forest Forum.

Al-Sunut had also been a popular leisure spot for Khartoum residents.

"We used to come in groups to study and have a good time," recalls Adam Hafiz Ibrahim, a student at Omdurman Islamic University.

Today, wood gatherers have supplanted the usual walkers. Disregarding army notices alerting them to landmines, men and women traverse the dry, open ground that now stands where the ancient forest once grew.

"We're not cutting the trees. We just pick up whatever wood's already on the ground to use for the fire," said Nafisa, a woman in her forties navigating the dry grasslands.

"We found the trees down. We collect the wood to sell to bakeries and families," said Mohamed Zakaria, a construction worker who lost his job because of the war.

Experts say that the economic hardship caused by the war combined with a lack of enforcement has encouraged logging.

"The logging continues, because those responsible for forest protection cannot access many areas," said Mousa el-Sofori, head of Sudan's Forests National Corporation.

Efforts to replant acacias are underway, Tayeb of the Khartoum forestry administration said, but seedlings grow slowly and can take years to mature.

Restoring the lost woodlands would be "long and costly", said Sofori.

"Some of these forests were centuries old," he added.

Varieties

Coffee Regions Hit by Extra Days of Extreme Heat, Say Scientists 

17 April 2012, North Rhine-Westphalia, Vluyn: A general view of Arabica Coffee beans. (dpa)
17 April 2012, North Rhine-Westphalia, Vluyn: A general view of Arabica Coffee beans. (dpa)
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Coffee Regions Hit by Extra Days of Extreme Heat, Say Scientists 

17 April 2012, North Rhine-Westphalia, Vluyn: A general view of Arabica Coffee beans. (dpa)
17 April 2012, North Rhine-Westphalia, Vluyn: A general view of Arabica Coffee beans. (dpa)

The world's main coffee-growing regions are roasting under additional days of climate change-driven heat every year, threatening harvests and contributing to higher prices, researchers said Wednesday.

An analysis found that there were 47 extra days of harmful heat per year on average in 25 countries representing nearly all global coffee production between 2021 and 2025, according to independent research group Climate Central.

Brazil, Vietnam, Colombia, Ethiopia and Indonesia -- which supply 75 percent of the world's coffee -- experienced on average 57 additional days of temperatures exceeding the threshold of 30C.

"Climate change is coming for our coffee. Nearly every major coffee-producing country is now experiencing more days of extreme heat that can harm coffee plants, reduce yields, and affect quality," said Kristina Dahl, Climate Central's vice president for science.

"In time, these impacts may ripple outward from farms to consumers, right into the quality and cost of your daily brew," Dahl said in a statement.

US tariffs on imports from Brazil, which supplies a third of coffee consumed in the United States, contributed to higher prices this past year, Climate Central said.

But extreme weather in the world's coffee-growing regions is "at least partly to blame" for the recent surge in prices, it added.

Coffee cultivation needs optimal temperatures and rainfall to thrive.

Temperatures above 30C are "extremely harmful" to arabica coffee plants and "suboptimal" for the robusta variety, Climate Central said. Those two plant species produce the majority of the global coffee supply.

For its analysis, Climate Central estimated how many days each year would have stayed below 30C in a world without carbon pollution but instead exceeded that level in reality -- revealing the number of hot days added by climate change.

The last three years have been the hottest on record, according to climate monitors.

Varieties

Dog Gives Olympics Organizers Paws for Thought

A dog wanders on the ski trail during the women's team cross country free sprint qualification event of the Milano Cortina 2026 Winter Olympic Games at Tesero Cross-Country Skiing Stadium in Lago di Tesero (Val di Fiemme), on February 18, 2026. (Photo by Anne-Christine POUJOULAT / AFP)
A dog wanders on the ski trail during the women's team cross country free sprint qualification event of the Milano Cortina 2026 Winter Olympic Games at Tesero Cross-Country Skiing Stadium in Lago di Tesero (Val di Fiemme), on February 18, 2026. (Photo by Anne-Christine POUJOULAT / AFP)
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Dog Gives Olympics Organizers Paws for Thought

A dog wanders on the ski trail during the women's team cross country free sprint qualification event of the Milano Cortina 2026 Winter Olympic Games at Tesero Cross-Country Skiing Stadium in Lago di Tesero (Val di Fiemme), on February 18, 2026. (Photo by Anne-Christine POUJOULAT / AFP)
A dog wanders on the ski trail during the women's team cross country free sprint qualification event of the Milano Cortina 2026 Winter Olympic Games at Tesero Cross-Country Skiing Stadium in Lago di Tesero (Val di Fiemme), on February 18, 2026. (Photo by Anne-Christine POUJOULAT / AFP)

A dog decided he would bid for an unlikely Olympic medal on Wednesday as he joined the women's cross country team free sprint in the Milan-Cortina Games.

The dog ran onto the piste in Tesero in northern Italy and gamely, even without skis, ran behind two of the competitors, Greece's Konstantina Charalampidou and Tena Hadzic of Croatia.

He crossed the finishing line, his moment of glory curtailed as he was collared by the organizers and led away -- his owner no doubt will have a bone to pick with him when they are reunited.