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Climate Change

Rising Antarctic ice melt will dramatically slow global ocean flows, study finds

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Rapidly melting Antarctic ice is dramatically slowing down the flow of water through the world’s oceans, and could have a disastrous impact on global climate, the marine food chain and even the stability of ice shelves, new research has found, Reuters reported.

The “overturning circulation” of the oceans, driven by the movement of denser water towards the sea floor, helps deliver heat, carbon, oxygen and vital nutrients around the globe.

But deep ocean water flows from the Antarctic could decline by 40% by 2050, according to a study published on Wednesday in the journal Nature.

“That’s stunning to see that happen so quickly,” said Alan Mix, a paleoclimatologist at Oregon State University and co-author on the latest Intergovernmental Panel on Climate Change assessments, who was not involved in the study. “It appears to be kicking into gear right now. That’s headline news.”

As temperatures rise, freshwater from Antarctica’s melting ice enters the ocean, reducing the salinity and density of the surface water and diminishing that downward flow to the sea’s bottom, read the report.

While past research has looked at what could happen to similar overturning circulation in the North Atlantic – the mechanism behind the doomsday scenario that would see Europe suffer from an Arctic blast as heat transport falters – less has been done on Antarctic bottom water circulation.

Scientists relied on around 35 million computing hours over two years to crank through a variety of models and simulations up to the middle of this century, finding deepwater circulation in the Antarctic could weaken at twice the rate of decline in the North Atlantic.

“They are massive volumes of water… and they are bits of the ocean that have been stable for a long time,” said study co-author Matthew England, an oceanographer at the University of New South Wales, in a news briefing.

The effect of meltwater on global ocean circulation has not yet been included in the complex models used by the IPCC to describe future climate change scenarios, but it is going to be considerable, England said.

Ocean overturning allows nutrients to rise up from the bottom, with the Southern Ocean supporting about three-quarters of global phytoplankton production, the base of the food chain, said a second study co-author, Steve Rintoul.

“If we slow the sinking near Antarctica, we slow down the whole circulation and so we also reduce the amount of nutrients that get returned from the deep ocean back up to the surface,” said Rintoul, a fellow at Australia’s Commonwealth Scientific and Industrial Research Organisation (CSIRO).

The study’s findings also suggest the ocean would not be able to absorb as much carbon dioxide as its upper layers become more stratified, leaving more CO2 in the atmosphere, Reuters reported.

The study showed that warm water intrusions in the western Antarctican ice shelf would increase, but it did not look at how this might create a feedback effect and generate even more melting.

“It doesn’t include the disaster scenarios,” said Mix. “In that sense, it’s actually kind of conservative.”

Climate Change

Strong El Niño could push 49 million more people into acute hunger, UN agency says

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A powerful El Niño weather event could push an additional nearly 49 million people into acute food insecurity across ‌some of the world’s most vulnerable regions by the end of next year, the World Food Programme said on Wednesday.

The U.N. agency said in a report that there was an 81% chance of a very strong El Niño event, with sea surface temperatures at their warmest levels since at least 1982 and potentially making it the strongest such event ​since 1950, Reuters reported.

El Niño, a periodic warming of ocean surface temperatures in the Pacific, alters global weather patterns and is often associated ​with drought in Southern Africa, delayed monsoons in parts of Asia and erratic rainfall elsewhere.

“These are events that ⁠in the past have triggered large-scale hunger,” Jean-Martin Bauer, director of WFP’s Food Security and Nutrition Analysis Service, told reporters.

Based on an analysis of 45 countries ​deemed vulnerable to the adverse effects of El Niño, WFP estimates that the number of people facing acute food insecurity could rise by almost ​49 million to a total of 274 million people, an increase of 22%, relative to the baseline population already experiencing crisis-level food insecurity or worse.

Central America and Southern Africa are expected to be among the hardest-hit regions, with the number of food-insecure people set to increase by 83% in Central America and nearly 75% in Southern Africa, the ​WFP report said.

Southern Africa as well as South America and the Caribbean could each see more than 12 million additional people fall into acute ​food insecurity.

Bauer said global food markets entered the El Niño period in a relatively strong position following good harvests in 2025, but warned that conflict in the ‌Middle East ⁠and potential weather-related crop losses could put further upward pressure on prices.

While past El Niño events have not typically triggered major global food price spikes, regional shortages and higher prices could worsen food access for vulnerable households, he said.

Funding cuts from U.S. and European donors in 2025 were also hampering efforts to monitor the developing crisis, with Bauer describing a growing drought of food-security data used to assess the impact of El Niño.

WFP conducted ​about 1.1 million household surveys in ​2024, compared with about 800,000 ⁠in 2025, while data collection has fallen further this year due to funding restrictions.

“At a time when you have a risk like an El Niño, it is important to have high-frequency data collection,” Bauer said, warning ​that reduced monitoring could make it harder to identify emerging food crises quickly.

EARLY ACTION REQUIRED

WFP said current ​forecasts point to rainfall ⁠deficits in parts of East Africa, the Sahel, Central America and the Caribbean, while flood risks could rise in Somalia and neighbouring areas.

Significant impacts are also projected across South and Southeast Asia, where drought risks, uneven monsoons and localized flooding could disrupt agricultural production, the report stated.

The agency stressed that ⁠the forecasts remain ​uncertain and that impacts will vary across regions, but warned that governments and aid ​agencies needed to prepare.

Richard Choularton, director of WFP’s Climate and Resilience Service, said the agency had scaled up anticipatory action programmes in 18 countries, reaching more than 1.3 million people so ​far this year with cash and other assistance to help in the event of extreme weather.

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Climate Change

Heavy monsoon rains claim lives across India as flooding and landslides continue

Further northeast, flood conditions in Assam have shown slight improvement, although nearly 179,000 people remain affected across seven districts.

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Heavy monsoon rains continue to batter large parts of India, triggering deadly landslides, flash floods and widespread disruption across several states.

In the southern state of Karnataka, three members of the same family were killed early Sunday after a rain-triggered landslide caused a hill to collapse onto their home in Shivamogga district. The state has experienced moderate to heavy rainfall over the past two days, with schools closed in several districts, including Karwar, Udupi, Chikkamagaluru and Dakshina Kannada.

Rivers in parts of Karnataka remain above danger levels, while flooded roads and waterlogged homes have prompted authorities to issue a high alert and urge residents to avoid rivers and low-lying areas.

In neighbouring Kerala, at least eight people have died in rain-related incidents after torrential downpours triggered landslides, flash floods and extensive damage, particularly in the state’s hilly regions. Several rivers burst their banks overnight, inundating towns across central districts. Authorities have opened 65 relief camps, providing shelter to more than 1,400 displaced residents.

Further northeast, flood conditions in Assam have shown slight improvement, although nearly 179,000 people remain affected across seven districts. The death toll from the state’s floods stands at 82, with thousands still living in relief camps. Several rivers, including the Dikhow and Dhansiri, continue to flow above danger levels, while more than 15,000 hectares of farmland remain submerged.

The Indian government has approved the early release of more than 21 billion rupees from the State Disaster Response Fund to support seven flood-affected states.

The India Meteorological Department has forecast heavy to very heavy rainfall across several regions, including Karnataka, Kerala, Rajasthan, Assam, Nagaland, Manipur, Mizoram, Tripura, West Bengal and Sikkim. Thunderstorms, lightning and strong winds are also expected in many parts of the country, with authorities urging residents in vulnerable areas to remain alert.

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Climate Change

Hundreds of thousands flee as devastating wildfires rage across France and Spain

Firefighters, military personnel and emergency responders have been deployed across the affected regions, while thousands of residents remain displaced.

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Hundreds of thousands of people have been forced to evacuate their homes as massive wildfires continue to sweep across parts of France and Spain, prompting emergency declarations and international assistance.

Authorities say more than 267,000 people have been evacuated as the fast-moving blazes, fueled by high temperatures, strong winds and dry conditions, continue to spread across large areas of both countries.

In France, officials ordered the complete evacuation of the Cap Ferret peninsula on the Atlantic coast as wildfires burned through more than 10,000 hectares of forest. Thousands of residents and tourists were instructed to leave the area by road and boat as flames advanced despite extensive firefighting efforts.

French President Emmanuel Macron described the situation as “very intense,” while the government activated the European Union’s Civil Protection Mechanism, bringing in additional firefighting aircraft from other EU member states to help battle the blazes.

In neighboring Spain, the government declared a national emergency after multiple wildfires threatened communities west of Madrid and in the province of Ávila. Authorities warned that several fires risked merging into larger fronts, complicating efforts to contain them.

Firefighters, military personnel and emergency responders have been deployed across the affected regions, while thousands of residents remain displaced.

Scientists have repeatedly warned that climate change is increasing the frequency and intensity of extreme heatwaves and wildfire conditions across southern Europe, with prolonged drought and soaring temperatures creating ideal conditions for rapidly spreading fires.

No final estimate of the damage has yet been released, and officials cautioned that dangerous weather conditions are expected to persist, raising concerns that the fires could continue to spread in the coming days.

Emergency services remain on high alert as authorities urge residents in affected areas to follow evacuation orders and avoid travel near active fire zones.

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