Storms, floods and wildfires led to more than 43 million displacements of children between 2016 and 2021, UNICEF has said.
The UN agency also warned that 100 million more children could be displaced by extreme weather over the next 30 years.
Weather-related disasters, which are becoming more violent and frequent as greenhouse gases cause the Earth’s atmosphere to heat up, uprooted up to 20,000 children a day in 44 countries over the six-year period, with 95% of those from floods, according to the research.
UNICEF said it had measured the number of child displacements rather than the number of children, as the same person could be displaced more than once.
The true number was also likely to be higher as many cases went undocumented.
China and the Philippines were among the countries most affected because of large child populations that were exposed to extreme weather and because early-warning and evacuation measures had improved recently, meaning better reporting.
Relative to the child population size, those on small island states such as Dominica in the Caribbean and Vanuatu in Oceania were the most affected by storms, while children in Somalia and South Sudan in Africa were most affected by floods.
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Flooding accounted for 40.9 million (95%) of child displacements during the period analysed, in part because of effective reporting and evacuation, while droughts caused 1.3 million internal displacements and wildfires triggered 810,000, with more than a third of those in 2020 alone.
Canada, Israel and the US recorded the most wildfire displacements, while Somalia recorded the most from drought.
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UNICEF’s executive director Catherine Russell said: “It is terrifying for any child when a ferocious wildfire, storm or flood barrels into their community.
“For those who are forced to flee, the fear and impact can be especially devastating, with worry of whether they will return home, resume school, or be forced to move again.”
In a report called Children Displaced In A Changing Climate, UNICEF said that decisions to move may be abrupt, in the face of immediate danger, or the result of an evacuation where lives are saved but at the cost of having to face other dangers.
Many children at risk of climate displacement were in countries that were already struggling with conflict and poverty and local authorities were often unable to offer enough resources in support.
Using a risk model developed by the Internal Displacement Monitoring Centre, UNICEF said that flooding from rivers had the potential to displace 96 million children over the next 30 years.
Based on other climate data, they said cyclones and storm surges could displace 10.3 million and 7.2 million children respectively over the same period, although the real number would be likely to be much higher as climate change brought more extreme weather more frequently.
“Moving may have saved their lives, but it’s also very disruptive. As the impacts of climate change escalate, so too will climate-driven movement,” Ms Russell said.
Katherine Nightingale, WaterAid’s global director of international affairs, said: “We have the tools and knowledge to respond to this escalating challenge for children, but we are acting far too slowly.
“We need to strengthen efforts to prepare communities, protect children at risk of displacement, and support those already uprooted.
“The climate crisis is a water crisis, with a staggering 90% of all natural disasters water-related and while all of us are feeling the effects, it’s the world’s most vulnerable who suffer the most.
“From flood defences to drought resistance, the solutions exist. But more investment is needed urgently to develop robust and reliable water, sanitation and hygiene systems which serve as a lifeline for communities who must defend themselves against climate uncertainty on a daily basis.”
More than a dozen people are missing after a tourist boat sank in the Red Sea off the coast of Egypt, officials have said.
The boat, Sea Story, was carrying 45 people, including 31 tourists of varying nationalities and 14 crew.
Authorities are searching for 17 people who are still missing, the governor of the Red Sea region said on Monday, adding that 28 people had been rescued.
The vessel was part of a diving trip when it went down near the coastal town of Marsa Alam.
Officials said a distress call was received at 5.30am local time on Monday.
The boat had departed from Port Ghalib in Marsa Alam on Sunday and was scheduled to reach its destination of Hurghada Marina on 29 November.
Some survivors had been airlifted to safety on a helicopter, officials said.
It was not immediately clear what caused the four-deck, wooden-hulled motor yacht to sink.
The firm that operates the yacht, Dive Pro Liveaboard in Hurghada, said it has no information on the matter.
According to its maker’s website, the Sea Story was built in 2022.
Russia launched a large drone attack on Kyiv overnight, with Volodymyr Zelenskyy warning the attack shows his capital needs better air defences.
Ukraine’s air defence units shot down 50 of 73 Russian drones launched, with no immediate reports of damage or injuries as a result of the attacks.
Russia has used more than 800 guided aerial bombs and around 460 attack drones in the past week.
Warning that Ukraine needs to improve its air defences, Ukrainian President Volodymyr Zelenskyy said: “An air alert has been sounded almost daily across Ukraine this week”.
“Ukraine is not a testing ground for weapons. Ukraine is a sovereign and independent state.
“But Russia still continues its efforts to kill our people, spread fear and panic, and weaken us.”
Russia did not comment on the attack.
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It comes as Russian media reported that Colonel General Gennady Anashkin, the commander of the country’s southern military district, had been removed from his role over allegedly providing misleading reports about his troops’ progress.
While Russian forces have advanced at the fastest rate in Ukraine since the start of the invasion, forces have been much slower around Siversk and the eastern region of Donetsk.
Russian forces have reportedly captured a British man while he was fighting for Ukraine.
In a widely circulated video posted on Sunday, the man says his name is James Scott Rhys Anderson, aged 22.
He says he is a former British Army soldier who signed up to fight for Ukraine’s International Legion after his job.
He is dressed in army fatigues and speaks with an English accent as he says to camera: “I was in the British Army before, from 2019 to 2023, 22 Signal Regiment.”
He tells the camera he was “just a private”, “a signalman” in “One Signal Brigade, 22 Signal Regiment, 252 Squadron”.
“When I left… got fired from my job, I applied on the International Legion webpage. I had just lost everything. I just lost my job,” he said.
“My dad was away in prison, I see it on the TV,” he added, shaking his head. “It was a stupid idea.”
In a second video, he is shown with his hands tied and at one point, with tape over his eyes.
He describes how he had travelled to Ukraine from Britain, saying: “I flew to Krakow, Poland, from London Luton. Bus from there to Medyka in Poland, on the Ukraine border.”
Russian state news agency Tass reported that a military source said a “UK mercenary” had been “taken prisoner in the Kursk area” of Russia.
The UK Foreign Office said it was “supporting the family of a British man following reports of his detention”.
The Ministry of Defence has declined to comment at this stage.