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Climate Change

Explainer: How El Nino is helping drive heatwaves and extreme weather

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Countries around the world from China to the United States are battling heatwaves, with the onset of the climate phenomenon El Nino helping push temperatures higher.

Scientists told Reuters that climate change and El Nino are the major drivers of extreme heat that have seen temperature records broken in Beijing and Rome, while leaving some 80 million Americans under excessive heat warnings.

El Nino is a natural phenomenon that in addition to contributing to higher temperatures in many parts of the world, also drives tropical cyclones in the Pacific and boosts rainfall and flood risk in parts of the Americas, Asia and elsewhere.

In June, the U.S. National Oceanic and Atmospheric Administration (NOAA) declared that an El Nino is now under way. The past three years have been dominated by the cooler La Nina pattern.

Scientists have warned that this year looks particularly worrying. The last time a strong El Nino was in full swing, in 2016, the world saw its hottest year on record. Meteorologists expect that this El Nino, coupled with excess warming from climate change, will see the world grapple with record-high temperatures.

Experts are also concerned about what is going on in the ocean. An El Nino means that waters in the Eastern Pacific are warmer than usual. Globally, sea temperatures hit new records for the months of May and June, according to the European Union’s Copernicus Climate Change Service. That could supercharge extreme weather, Reuters reported.

“We’re in unprecedented territory,” said Michelle L’Heureux, a meteorologist with NOAA’s Climate Prediction Center.

This year’s El Nino could lead to global economic losses of $3 trillion, according to a study published last month in the journal Science, shrinking GDP as extreme weather decimates agricultural production, manufacturing, and helps spread disease.

Governments in vulnerable countries are taking note. Peru has set aside $1.06 billion to deal with El Nino’s impacts and climate change, while the Philippines — at risk from cyclones — has formed a special government team to handle the predicted fallout.

WHAT CAUSES AN EL NINO?
El Nino is a natural climate pattern borne out of unusually warm waters in the eastern Pacific.

It forms when the trade winds blowing east-to-west along the equatorial Pacific slow down or reverse as air pressure changes, although scientists are not entirely sure what kicks off the cycle.

Because the trade winds affect the sun-warmed surface waters, a weakening causes these warm western Pacific waters to slosh back into the colder central and eastern Pacific basins.

During the 2015-16 El Nino — the strongest such event on record — anchovy stocks off the coast of Peru crashed amid this warm water incursion. And nearly a third of the corals on Australia’s Great Barrier Reef died. In too-warm waters corals will expel living algae, causing them to calcify and turn white.

This build-up of warm water in the eastern Pacific also transfers heat high into the atmosphere through convection, generating thunderstorms.

“When El Nino moves that warm water, it moves where thunderstorms happen,” said NOAA meteorologist Tom DiLiberto. “That’s the first atmospheric domino to fall.”

HOW DOES EL NINO AFFECT THE WORLD’S WEATHER?
This shift in storm activity affects the current of fast-flowing air that moves weather around the world — called the subtropical jet stream — pushing its path southward and straightening it out into a flatter stream that delivers similar weather along the same latitudes.

“If you’re changing where the storm highway goes … you’re changing what kind of weather we would expect to see,” DiLiberto said.

During an El Nino, the southern United States experiences cooler and wetter weather, while parts of the U.S. West and Canada are warmer and drier.

Hurricane activity falters as the storms fail to form in the Atlantic due to changes in the wind, sparing the United States. But tropical cyclones in the Pacific get a boost, with storms often spinning toward vulnerable islands.

Some parts of Central and South America experience heavy rainfall, although the Amazon rainforest tends to suffer from drier conditions.

And Australia endures extreme heat, drought and bushfires.

El Nino could offer a reprieve to the Horn of Africa, which recently suffered five consecutive failed rainy seasons. El Nino brings more rain to the Horn, unlike the triple-dip La Nina, which desiccated the region.

Historically, both El Nino and La Nina have occurred about every two to seven years on average, with El Nino lasting 9 to 12 months. La Nina, which takes hold when waters are cooler in the Eastern Pacific, can last one to three years.

IS CLIMATE CHANGE AFFECTING EL NINO?
How climate change might be affecting El Nino is “a very big research question,” said DiLiberto. While climate change is doubling down on the impacts from El Nino — layering heat on top of heat, or excess rainfall on top of excess rainfall — it’s less clear if climate change is influencing the phenomenon itself.

Scientists are not sure whether climate change will shift the balance between El Nino and La Nina, making one pattern more or less frequent. If ocean temperatures are rising across the board, it is unlikely the cycle would change, scientists said, as the basic mechanics behind the phenomenon stay the same.

However, if some parts of the ocean are warming faster than others, that could influence how El Nino plays out by amplifying temperature differences.

Climate Change

Iran war is supercharging the clean energy transition, UN climate chief says

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The Iran war is “supercharging” the world’s shift to renewable energy, as countries scramble to reduce their exposure to volatile oil and ​gas markets, the U.N. climate secretary said on Thursday.

The U.S.-Israeli war ‌with Iran has upended oil and gas supplies, prompting some countries to ration fuel and others to roll out subsidies and tax cuts to shield consumers from surging prices, Reuters reported.

Early signs indicate the ​war, which began two months ago, is speeding up some countries’ low-carbon ​transition.

Demand for rooftop solar systems across Europe has surged, while countries ⁠including Pakistan have reported a jump in electric vehicle sales.

Chinese President Xi Jinping called this month ​to speed up the construction of a new energy system to safeguard energy ​security, emphasising hydropower development and the expansion of nuclear power.

“Those who’ve fought to keep the world hooked on fossil fuels are inadvertently supercharging the global renewables boom,” said Simon Stiell, Executive ​Secretary of the U.N.’s climate secretariat UNFCCC.

“Renewables offer safer, cheaper, cleaner energy ​that can’t be held captive by narrow shipping straits, or global conflicts,” Stiell told a meeting ‌of ⁠government officials at the International Energy Agency in Paris.

However, the war has also prompted some nations to increase the use of highly polluting coal or furnace oil-based power generation as they struggle to replace gas from the Middle East.

Turkey’s Climate Minister ​Murat Kurum – who will ​preside over the ⁠U.N.’s COP31 climate summit this year – said fossil fuel dependency now topped the global political agenda.

“The best way to protect ​citizens from the violent convulsions of global energy markets is ​to accelerate ⁠the clean-energy transition,” he said in a statement after the IEA event.

Around 60 governments including Brazil, Germany, Canada and Nigeria, met in Colombia this week for a summit to ⁠discuss how ​to phase out fossil fuels.

Conference hosts Colombia and ​the Netherlands said on Thursday countries had agreed to continue working, over the next year, on ​how to do this in their trade systems.

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Climate Change

Uzbek president emphasizes Afghanistan’s role in regional water cooperation

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At a regional water summit in Astana on Wednesday, Uzbekistan’s President Shavkat Mirziyoyev emphasized the importance of involving Afghanistan in broader regional cooperation on water, climate, and environmental issues.

He underlined that Afghanistan’s participation is essential for effective management of shared water resources in Central Asia, particularly in the Aral Sea basin, where upstream and downstream countries are closely interconnected.

The Uzbek president also called for increased international support for environmental protection and land reclamation projects inside Afghanistan.

He further stressed that long-term stability in the region will depend on the development of a legal framework governing water allocation that clearly defines the rights and obligations of all countries in the basin.

Uzbekistan’s authorities have expressed concern over the construction of the Qosh Tepa canal in Afghanistan, saying it could “radically change the water regime and balance” in Central Asia.

The Islamic Emirate of Afghanistan (IEA), however, has said that Uzbekistan will not be harmed by the canal.

 

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Climate Change

Webinar series highlights growing climate pressures on livelihoods in Afghanistan

Afghanistan is widely regarded as one of the countries most vulnerable to climate change, with limited capacity to manage its effects.

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A recent webinar series hosted by the United Nations Assistance Mission (UNAMA) in Afghanistan has underscored the escalating impact of climate change on humanitarian needs and livelihoods across Afghanistan.

Held in partnership with Samuel Hall, the six-part series in late 2025 brought together Afghan experts, humanitarian workers, UN agencies, NGOs and local stakeholders to examine the country’s mounting environmental challenges and explore potential responses.

Afghanistan is widely regarded as one of the countries most vulnerable to climate change, with limited capacity to manage its effects. Participants warned that communities are already facing severe consequences, including rising displacement, worsening food insecurity and increasing pressure on natural resources.

The discussions highlighted that nearly 70 percent of the population depends on climate-sensitive agriculture, leaving livelihoods exposed to shifting weather patterns. A changing water cycle has intensified water scarcity nationwide, while urban centres such as Kabul are grappling with declining groundwater levels.

At the same time, increasingly erratic seasonal flooding continues to damage homes, infrastructure and farmland, compounding humanitarian needs.

Speakers also pointed to the growing link between climate change and displacement, noting that environmental shocks are driving both internal migration and cross-border movements as livelihoods come under strain.

Across the six sessions, participants explored a range of themes, including water management, climate finance, the role of women and youth, and the intersection of climate change with peace and security.

The series aimed to amplify Afghan perspectives and maintain focus on the country’s climate challenges, particularly as Afghanistan remains largely absent from global climate forums.

Organisers said the discussions highlighted both the scale of the crisis and the depth of local expertise available to respond, while calling for sustained, coordinated and evidence-based action.

Summary notes and recordings from the sessions have been released to inform policymakers, donors and practitioners, outlining key recommendations and areas requiring further investment and collaboration.

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