DNA reveals when modern humans began ‘mixing’ with Neanderthals
Marek Jantač/National Museum in Prague
(LONDON) — Scientists have pinpointed a time frame in which Neanderthals began “mixing” with modern humans, based on the DNA of early inhabitants of Europe.
Analysis of the oldest-known genomes from early modern humans who lived in Europe indicates that the mixing occurred more recently than previous estimates, according to a paper published in Nature on Thursday.
The mixing likely occurred between 45,000 and 49,000 years ago — meaning the two genetically distinct groups overlapped on the European continent for at least 5,000 years, according to the paper.
Radiocarbon dating of bone fragments from Ranis, Germany, were shown to have 2.9% Neanderthal ancestry, which the authors believe occurred from a single mixing event common among all non-African individuals.
The mixing event likely occurred about 80 generations before those individuals lived, the researchers said.
The group from Ranis also represents the oldest-known family units, Arev Sumer, a researcher at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and co-author of the paper, said during a news conference on Wednesday. Six individuals from the group were found to have a close kinship, including a mother and daughter.
The findings imply that the ancestors of all currently sequenced non-African early humans lived in a common population during this time, stretching from modern Great Britain to Poland, Johannes Krause, a biochemist at the Max Planck Institute for Evolutionary Anthropology and co-author of the study, said during the news conference.
“This was rather surprising, because modern humans had just left Africa a few thousand years earlier and had reached this northern part of Europe where climatic conditions were rather cold — much colder than today,” Krause said. “It was the middle of the Ice Age.”
Groups of early humans previously studied in Europe showed very few cases of mixing between Neanderthals and Homo sapiens, according to the paper.
The groups were represented by individuals from the Bacho Kiro region in Bulgaria and a woman named Zlaty kun from Czechia — believed to be part of the earliest population to diverge from the “Out-of-Africa” lineage, a small group of Homo sapiens that left the African continent about 80,000 years ago.
Within those two groups, the individuals from Bulgaria only suggest two mixing events with Neanderthals, while Zlaty kun’s lineage only suggests one mixing event, according to the paper.
Zlaty kun was found to have a fifth- or sixth-degree genetic relationship with two Ranis individuals, Sumer said, adding that the Ranis group was part of a small population that left no descendants among present-day people.
Neanderthals are believed to have become extinct about 40,000 years ago, Krause said.
The findings offer researchers a much more precise window of time in which the mixing occurred, as well as more insights into the demographics of early modern humans and the earliest Out-of-Africa migrations, according to the paper.
More research is needed to explore the events following the Out-of-Africa migration and the earliest movements of modern humans across Europe and Asia, Sumer said.
(NEW YORK) — The climate crisis is not a distant threat; it’s happening right now and affecting what matters most to us. Hurricanes intensified by a warming planet and drought-fueled wildfires are destroying our communities. Rising seas and flooding are swallowing our homes. And record-breaking heat waves are reshaping our way of life.
The good news is we know how to turn the tide and avoid the worst possible outcomes. However, understanding what needs to be done can be confusing due to a constant stream of climate updates, scientific findings, and critical decisions that are shaping our future.
That’s why the ABC News Climate and Weather Unit is cutting through the noise by curating what you need to know to keep the people and places you care about safe. We are dedicated to providing clarity amid the chaos, giving you the facts and insights necessary to navigate the climate realities of today — and tomorrow.
Could the UK be a model for clean electricity production?
When it comes to curbing climate change, scientists have been clear. The world needs to stop burning fossil fuels. However, much of the world still depends on significant amounts of oil, gas and coal for its energy needs.
England kicked off the coal power revolution in 1882 and, for the next 142 years, burned the greenhouse gas-emitting energy source. But last year, the U.K. became the first G7 country to phase out coal power plants. When the Ratcliffe-on-Soar plant in Nottinghamshire closed in September, it marked the end of an era for the most-polluting fossil fuel in that region.
A new analysis by Carbon Brief, a U.K.-based climate publication, found that by eliminating coal and adopting more clean energy sources, the U.K. has significantly cleaned up its electricity generation, meaning it’s generating the least amount of greenhouse gas emissions in its history.
According to the analysis, in 2024, renewable energy sources reached a record-high 45% in the country, while fossil fuels made up 29%. Nuclear energy accounted for another 13%. Over the last decade, renewable energy sources have more than doubled. As a result, carbon emissions have plunged by two-thirds over that time.
While gas-fired power plants are still the U.K.’s single-largest source of electricity, wind power has almost caught up. However, the analysis found that when new wind projects come online in the coming months, the U.K. will likely generate more power from wind than gas in 2025.
While the incoming Trump administration calls for more drilling and fossil fuel use, including coal, in the United States, the U.K. just had its cleanest year ever for electricity generation. The combination of sunsetting coal power plants and increasing the amount of renewable energy is moving the country in the direction scientists say is crucial for stopping the worst impacts of human-amplified climate change.
-ABC News Climate Unit’s Matthew Glasser
New York will make polluters pay for climate change damage
New York State is establishing a “Climate Superfund” that will make companies that release large amounts of greenhouse gas emissions financially responsible for some of the damage that climate change caused to the state’s infrastructure, communities and ecosystems.
On Thursday, Gov. Kathy Hochul, signed a bill into law requiring large fossil fuel companies to “pay for critical projects that protect New Yorkers.” Citing the hundreds of billions of dollars the state will have to spend on climate adaptation through 2050, the law requires that the companies responsible for most carbon emissions, more than a billion metric tons, between 2000-2018 pay nearly $3 billion annually for the next 25 years.
“With nearly every record rainfall, heatwave, and coastal storm, New Yorkers are increasingly burdened with billions of dollars in health, safety, and environmental consequences due to polluters that have historically harmed our environment,” Hochul said in a press statement.
The new law calls climate change “an immediate, grave threat to the state’s communities, environment, and economy.” According to NASA, 97% of climate scientists believe human activity, specifically burning fossil fuels, is the primary driver of climate change and global warming. And those changes to the climate have resulted in more intense and more frequent extreme weather events.
The New York legislature said the “Climate Superfund” was now possible because scientific research enables them “to determine with great accuracy the share of greenhouse gases released into the atmosphere by specific fossil fuel companies over the last 70 years or more, making it possible to assign liability to and require compensation from companies commensurate with their emissions during a given time period.”
“The governor’s approval of the Climate Change Superfund Act is a welcome holiday gift for New York taxpayers,” said Blair Horner, executive director of the New York Public Interest Research Group, in a statement. “Until her approval, New York taxpayers were 100% on the financial hook for climate costs. Now Big Oil will pay for much of the damages that they helped cause.”
The state anticipates collecting up to $75 billion over 25 years, and the law requires that at least 35% of the funds go to disadvantaged communities.
New York State Senator Liz Krueger said the new legislation was modeled after the federal Superfund law that requires polluters to pay for toxic waste cleanups.
But not everyone is cheering the new legislation. In a letter to Gov. Hochul, urging her to veto the bill, the Business Council of New York State, which represents more than 3,000 companies, chambers of commerce and associations, wrote, “The bill discriminates by targeting only the largest fossil fuel extraction and processing firms, including petroleum, natural gas, and coal.”
The Council added, “This legislation ignores the near universal use and benefits associated with fossil fuel.” They argued that the new law would do nothing to address what they said is the primary cause of carbon emissions: “consumption.”
There are still a lot of specifics that have yet to be determined, and the state’s Department of Environmental Conservation is responsible for figuring out the program’s details over the next few years. With legal challenges all but certain, it will be some time before the companies actually have to pay up.
-ABC News Climate Unit’s Matthew Glasser
Could climate change bring more earthquakes?
Earthquakes are usually triggered by seismic activity deep beneath the Earth’s surface and far beyond the influence of atmospheric conditions. However, according to new research, there may be instances where climate change can impact seismic activity.
A recent Colorado State University study suggests that melting glaciers could impact earthquake activity in some areas. Researchers analyzed southern Colorado’s Sangre de Cristo Mountains during the last ice age. They found the active fault responsible for triggering earthquakes was held in place by the weight of glaciers sitting on top of it.
Thousands of years ago, as the last ice age ended and the planet began to naturally warm, glaciers in this region began to melt. The study found that as the ice melted, there was less pressure on the quake-prone fault, which triggered an increase in earthquake activity. Basically, the glacier was holding the fault in place — less ice, less weight.
There is limited scientific evidence linking changes in Earth’s climate to earthquake activity. Still, this study demonstrates that, in some cases, climate-related events, like melting glaciers, could influence seismic events.
Sean Gallen, Geosciences associate professor and senior author of the study, highlights that this research helps us better understand the factors that can drive earthquakes.
Even though the study focused on investigating links between Earth’s natural climate variability (an ice age) and seismic activity, this research shows how other glacier-adjacent faults worldwide could respond as greenhouse gas emissions accelerate global warming.
As human-amplified climate change continues to drive global glacier melt, earthquake activity along these faults could increase as glaciers recede.
“We see this in the rapid mountain glacial retreats in Alaska, the Himalayas and the Alps,” said Cece Hurtado, an author of the study. “In many of these regions, there are also active tectonics, and this work demonstrates that as climate change alters ice and water loads, tectonically active areas might see more frequent fault movements and earthquakes due to rapidly changing stress conditions.”
(NEW YORK) — The climate crisis is not a distant threat; it’s happening right now and affecting what matters most to us. Hurricanes intensified by a warming planet and drought-fueled wildfires are destroying our communities. Rising seas and flooding are swallowing our homes. And record-breaking heat waves are reshaping our way of life.
The good news is we know how to turn the tide and avoid the worst possible outcomes. However, understanding what needs to be done can be confusing due to a constant stream of climate updates, scientific findings, and critical decisions that are shaping our future.
That’s why the ABC News Climate and Weather Unit is cutting through the noise by curating what you need to know to keep the people and places you care about safe. We are dedicated to providing clarity amid the chaos, giving you the facts and insights necessary to navigate the climate realities of today — and tomorrow.
Millions of students are missing school because of extreme weather
A new analysis from UNICEF finds that nearly a quarter of a billion children worldwide had their education disrupted by extreme weather events in 2024 — exacerbating what the organization calls an “existing learning crisis.”
The report found that at least 242 million students across 85 countries experienced schooling disruptions last year because of extreme weather like heat waves, storms, floods, droughts and tropical cyclones.
“Children are more vulnerable to the impacts of weather-related crises, including stronger and more frequent heatwaves, storms, droughts and flooding,” UNICEF Executive Director Catherine Russell said. “Last year, severe weather kept one in seven students out of class, threatening their health and safety, and impacting their long-term education.”
Heat waves were the most common weather disruptor for education. UNICEF found that over 118 million students were impacted by extreme heat in April alone, with South Asia seeing some of the most widespread impacts.
The report also found that September had the most frequent weather-related disruptions, with at least 16 countries suspending classes for a time due to extreme weather events like Typhoon Yagi in East Asia.
While the analysis found that almost three-quarters of the students impacted were in low and lower-middle income countries, UNICEF says no region was free from these effects.
“Education is one of the services most frequently disrupted due to climate hazards. Yet it is often overlooked in policy discussions, despite its role in preparing children for climate adaptation,” Russell said. “Children’s futures must be at the forefront of all climate related plans and actions.”
-ABC News climate unit’s Kelly Livingston
Climate funders say they will cover US climate obligations after Paris Agreement withdrawal
On Monday, President Donald Trump announced his intention to withdraw the United States from the Paris Agreement, the U.N.-backed international climate treaty. Bloomberg Philanthropies announced Thursday that they, along with a coalition of climate charities, would step up and ensure that the U.S. meets its obligations under the Paris Agreement, including any financial and reporting requirements.
“While government funding remains essential to our mission, contributions like this are vital in enabling the UN Climate Change secretariat to support countries in fulfilling their commitments under the Paris Agreement and a low-emission, resilient, and safer future for everyone,” said Simon Stiell, United Nations climate change executive secretary, in a press statement.
This is the second time Trump has withdrawn the country from the Paris Agreement. During his first term, Trump justified backing out of the treaty by claiming that participating in the agreement would result in the loss of jobs and cost the U.S. trillions of dollars. In reality, in 2023, clean energy jobs grew at more than twice the rate of the overall U.S. labor market and accounted for more than 8.35 million positions, according to a Department of Energy report. In terms of spending, the U.S. has committed several billion dollars to the effort, not trillions.
Michael Bloomberg, a billionaire businessman, founder of Bloomberg Philanthropies and a U.N. Secretary-General’s Special Envoy on Climate Ambition and Solutions, said he also plans to continue supporting a coalition of states, cities and businesses that are working to reduce U.S. greenhouse gas emissions by 61-66% below 2005 levels by 2035.
“More and more Americans have had their lives torn apart by climate-fueled disasters, like the destructive fires raging in California. At the same time, the United States is experiencing the economic benefits of clean energy, as costs have fallen and jobs have grown in both red and blue states. The American people remain determined to continue the fight against the devastating effects of climate change,” Bloomberg said.
(SEOUL and NEW YORK) — South Korean police will consider imposing a travel ban on President Yoon Suk Yeol, a senior officer said at a press conference on Monday, local time.
Additionally, they had not ruled out questioning Yoon as part of their ongoing investigation into the illegality of last week’s martial law declaration, the officer said.’
“There are no human or physical restrictions to the subject of an investigation,” Woo Jong-soo, a senior police officer in charge of the inquiry into the martial law declaration, said, before outlining the scope of the current investigation.
He explained that there were originally 120 members of the Security Investigation Division assigned to look into five reports related to Yoon’s implementation of martial law on Dec. 3.
As of Sunday, there were about 150 people working on the investigative team that he’s leading, he said.
So far, the team has “conducted searches and seizures of the office, official residence, and home of former Minister of National Defense Kim Yong-hyun, a key suspect in this case,” Woo said, adding that investigators were also questioning key witnesses, including the National Election Commission and the Ministry of National Defense.
“Going forward, we plan to closely investigate the decision-making process related to the declaration of martial law, the damage to the National Assembly and the National Election Commission, and the police measures,” Woo said.
“In addition, we will focus on proving the charges through forensic analysis of seized items and analysis of call records,” he added.
Woo also explained that his team, which he referred to as “the main investigator of the crime of sedition,” feels a heavy sense of responsibility, and therefore, he promised the public: “We will thoroughly investigate, without any doubts.”
He stated that they would do so by “mobilizing all available resources in accordance with the law and principles.”
