Climate Change
Rising Antarctic ice melt will dramatically slow global ocean flows, study finds
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
Iran war is supercharging the clean energy transition, UN climate chief says
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.
Climate Change
Uzbek president emphasizes Afghanistan’s role in regional water cooperation
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.
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.
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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