Express fitness is gaining popularity in the United States, as people try to squeeze exercise into their hectic schedules. To accommodate them, gyms are offering more total body workouts in a compressed period of time. VOA’s Jill Craig has more.
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U.S. Senator John McCain’s death from glioblastoma on Saturday brought new attention to the most deadly type of brain cancer. 

The National Brain Tumor Society says 80 percent of brain tumors are benign, but a glioblastoma tumor grows rapidly, and it returns after treatment. It usually affects adults, especially men over age 50, but women and even children can develop this type of cancer. 

Glioblastoma begins in glial cells that surround and support nerve cells. Because glioblastoma spreads so quickly, the sooner the cancer is diagnosed, the more treatment options a patient has. 

Symptoms can include headaches, seizures, memory loss, changes in personality, changes in vision, and difficulty speaking or understanding conversations. The tumor can also affect coordination.

Glioblastoma is generally considered incurable because it is difficult to remove all of the cancer during surgery, which is why it can grow back. Surgery is usually the first treatment, followed by radiation and chemotherapy. McCain’s treatment included these three options.

Drugs used to treat patients with this type of cancer have lengthened patients’ lives over the past two decades. The National Cancer Institute reports that in the mid-1990s, the average survival rate was eight to 10 months. With new drugs patients now live between 15 and 18 months on average. McCain’s tumor was diagnosed in July 2017. He died little more than a year later.

The National Cancer Institute says survival has also improved slightly. In the mid-1990s, essentially no one with glioblastoma survived five years after diagnosis, now 15 percent of patients do, a very small proportion compared with survival rates for most other types of cancer.

Researchers are looking for new ways to treat glioblastoma. Those at Duke University in Durham, North Carolina, are using a modified polio vaccine with promising results. In the first part of a clinical trial, 21 percent of the patients survived for three years after being treated.

At Texas A&M University in College Station, researchers are looking to see whether they can disrupt the body’s production of a protein associated with tumor growth. 

Other research involves seeing whether the body’s own immune system could fight off the cancer cells.

The National Brain Tumor Society issued a statement on McCain’s death. It said the society was “profoundly saddened” and called for a national effort to combat the disease. 
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When farmer Julimar Pansera purchased land in Brazil’s interior seven years ago, it was blanketed in tiers of fruit trees, twisted shrubs and the occasional palm standing tall in a thicket of undergrowth.

He mowed down most of that vegetation, set it ablaze and started planting soybeans. Over the past decade, he and others in the region have deforested an area larger than South Korea.

Permissive land-use policies and cheap farm acreage here have helped catapult Brazil into an agricultural superpower, the world’s largest exporter of soy, beef and chicken and a major producer of pork and corn. This area has also lured farmers and ranchers away from the Amazon jungle, whose decline has spurred a global outcry to protect it.

The tradeoff, environmentalists say, is that while Brazil has slowed destruction of the renowned rainforest from its worst levels, it has put another vital ecological zone at risk: a vast tropical savanna that is home to 5 percent of species on the planet.

Known as the Cerrado, this habitat lost more than 105,000 square kilometers (40,541 square miles) of native cover since 2008, according to government figures. That’s 50 percent more than the deforestation seen during the same period in the Amazon, a biome more than three times larger. Accounting for relative size, the Cerrado is disappearing nearly four times faster than the rainforest.

The largest savanna in South America, the Cerrado is a vital storehouse for carbon dioxide, the greenhouse gas whose rising emissions from fossil fuels and deforestation are warming the world’s atmosphere. Brazilian officials have cited protection of native vegetation as critical to meeting its obligations under the Paris Agreement on climate change. But scientists warn the biome has reached a tipping point that could hamper Brazil’s efforts and worsen global warming.

By focusing on one problem, Brazil essentially created another, said Ane Alencar, science director of the non-profit Amazon Environmental Research Institute, known as IPAM.

“There’s a high risk for the climate associated with this expansion,” Alencar said. “Limiting and calling attention to deforestation in the Amazon, in a way it forced the agribusiness industry to expand in the Cerrado.”

The toll can already be seen in the region’s water resources. Streams and springs are filling with silt and drying up as vegetation around them vanishes. That in turn is weakening the headwaters of vital rivers flowing to the rest of the country, scientists say. The imperiled waterways include the Sao Francisco, Brazil’s longest river outside the Amazon, where water levels are hitting never-before-seen lows in the dry season.

“The removal of vegetation can lead a body of water to extinction,” said Liliana Pena Naval, an environmental engineering professor at the Federal University of Tocantins.

Wildlife, too, is under threat, including rare hyacinth macaws, maned wolves and jaguars that call the shrinking savanna home. So are thousands of plants, fish, insects and other creatures found nowhere else on earth, many of which are only beginning to be studied.

“I compare it to the burning of the ancient Library of Alexandria,” said Mercedes Bustamante, an ecologist at the University of Brasilia. “You lose the accumulated evolutionary record of thousands of years that never can be recovered.”

Farmers see the Cerrado’s development as critical to global food security and their nation’s prosperity. Brazil’s agriculture sector grew a sizzling 13 percent in 2017, while the overall economy barely budged. The nation’s ability to keep producing new farmland cheaply has given it an edge over rivals and cemented its status as a vital supplier to the world’s tables.

“Imagine, if not for Brazil’s production, how much more hunger would there be,” farmer Pansera said.

The Green Revolution

Roughly the size of Mexico, straddling Brazil’s mid-section from its far western borders with Paraguay and stretching northeast toward the Atlantic coast, the Cerrado has seen about half of its native forests and grasslands converted to farms, pastures and urban areas over the past 50 years.

Deforestation in the region has slowed from the early 2000s, when Brazil’s soy boom was gaining steam. Still, farmers continue to plow under vast stretches of the biome, propelled largely by Chinese demand for Brazilian meat and grain. The Asian nation is Brazil’s No. 1 buyer of soybeans to fatten its own hogs and chickens. China is also a major purchaser of Brazilian pork, beef and poultry to satisfy the tastes of its increasingly affluent consumers.

Rising trade tensions between China and the United States have only deepened that connection. Brazil’s soybean exports by value to China are up 18 percent through the first seven months of the year as Chinese buyers have canceled tens of millions of dollars’ worth of contracts with U.S. suppliers.

The trend bodes well for producers in the Cerrado’s frontier region known as Matopiba, shorthand for the northeastern Brazilian states of Maranhao, Tocantins, Piaui and Bahia. Land here is cheap. Virgin plots near Pansera in the state of Tocantins can be had for $248 an acre on average, according to agribusiness consultancy Informa Economics IEG FNP. That compares to an average of $3,080 per acre for already cleared farmland in the United States. Soy planting in Matopiba has more than doubled over the past decade.

Pansera, 50, is part of a wave of industrious transplants from southern Brazil who are remaking the region. His formal education stopped at middle school, but he found land enough in the Cerrado to match his big ambitions. He now presides over nearly 19 square miles (49 square kilometers) of manicured soy fields and has about 20 full-time workers on his payroll.

Pansera’s soybeans will bring in an estimated profit of nearly 5 million reais ($1.23 million) this year, most of which he plans to invest back into the farm.

Government policies have intentionally driven industrial-scale farming here. Short on farmland to feed its growing population, Brazil in the 1970s looked to its vast savanna, a region early explorers had dubbed “cerrado,” or “closed,” because of its tangled woodlands.

State agriculture scientists developed fertilizers and additives to fix the acidic, nutrient-poor earth and created soybean strains that could thrive in the tropics. Arable land exploded. Within a decade, Brazil transformed itself from a food importer to a net exporter. By the 1990s it was moving global commodities markets.

“Agriculture in the Cerrado is what took Brazil to the next level,” Agriculture Minister Blairo Maggi told Reuters. Known as Brazil’s “Soy King,” Maggi is a billionaire whose family runs one of the largest private soybean operations in the world, much of it in the Cerrado.

Maggi said growers are respectful of legally allowed limits on deforestation. Their “rational” occupation of the Cerrado has helped Brazil’s economy, he said.

Farmers have emerged as a powerful political force bent on keeping Brazil’s countryside open for business. Lawmakers in the country’s largely rural, pro-agriculture voting bloc, who comprise more than 40 percent of the nation’s congress, have led a rollback of environmental laws in recent years.

Those efforts include a 2012 loosening of Brazil’s landmark Forest Code that sets requirements for preserving native vegetation. The change reduced potential penalties for farmers, ranchers and loggers charged with past illegal deforestation, and made it easier for landowners to clear more of their holdings. Annual deforestation in the Amazon last year was up 52 percent from a record low in 2012.

Still, environmental protections there remain the most robust in Brazil. Rainforest farmers are required by law to preserve 80 percent of native vegetation on their plots.

And global grain traders in 2006 voluntarily agreed to stop purchasing any soy harvested from newly deforested Amazon jungle areas. As part of its obligations under the Paris Agreement, the government pledged to eliminate illegal Amazon deforestation by 2030.

Brazil has made no similar push to preserve the Cerrado, which has long been viewed as a resource to be developed.

Cerrado farmers are required to preserve as little as 20 percent of the natural cover, and up to 35 percent in areas neighboring the Amazon. Those who don’t maximize use of their tracts risk having their land declared idle and subject to redistribution under a 1980 federal land-reform initiative aimed at assisting rural, low-income people, said Elvison Nunes Ramos, sustainability coordinator with the Ministry of Agriculture.

“The message being sent to the farmer is that he should not preserve, he should deforest,” Nunes Ramos said of the policy.

A spokesman for Incra, the government agency that verifies the use of the rural land, said its job is to ensure “the fulfillment of the social function of the property.”

Water, wildlife under threat

Environmentalists say the Cerrado’s wooded grasslands have failed to capture the public’s attention the way the Amazon’s lush jungles have.

People view the Cerrado “just as bushes, twisted vegetation and shrubs,” lamented Alencar, the science director at IPAM.

What many don’t see, she said, is the connection between the soybean-fed meat on their plates and the steady decline of one of the world’s great carbon sinks, a bulwark against global warming.

Plants here send roots deep into the earth to survive seasonal drought and fires, creating a vast underground network that some have likened to an upside-down forest. Destruction of surface vegetation, and the resulting die-off of the life below, released 248 million tons of greenhouse gas into the atmosphere in 2016, according to estimates by the Climate Observatory, a Brazilian conservation group. That’s roughly two-and-a-half times the annual tailpipe emissions from all cars in Brazil.

Watersheds are hurting, too.

In Palmeirante, a rural municipality in the state of Tocantins, subsistence farmer Ronivon Matias de Andrade blames expanding mega-farms for damaging a community water source.

Dressed in faded shorts and flip flops, he showed a visitor the remains of what until recently had been a shady woodland: uprooted trees and freshly exposed earth pocked with heavy-equipment tracks.

Stripped of its vegetation, sandy topsoil is now filling a nearby creek and an adjoining freshwater pool where he and other rural families draw drinking water. He scooped up a murky handful in disgust.

“How many are being finished off in this manner in this state?” 43-year-old Andrade said.

Environmentalists say vanishing creeks like those in Palmeirante are threatening the nation’s water supply. Seemingly insignificant sources — tiny brooks, nameless rivulets — are vital building blocks supplying water to tributary streams that in turn feed some of Brazil’s largest rivers.

Of a dozen major water systems in Brazil, eight are born in the Cerrado. They include the Sao Francisco, the country’s fourth-largest river, which was once famed for its paddle-wheeled riverboats known as gaiolas. Environmentalists say man-made diversions, including agriculture and hydroelectric dams, have helped alter water levels to a degree that long stretches of the river are now unnavigable during the dry season.

Loss of native ground cover is also driving microclimate change in the region, they say. Reduced vegetation leads to higher ground temperatures and lower humidity, a recipe for less rainfall. A study conducted at the University of Brasilia links deforestation to an 8.4 percent drop in precipitation from 1977 to 2010 in the Cerrado.

Cerrado wildlife is under pressure as habitat shrinks. More than 300 species that dwell here are considered threatened with extinction, according to the government. Among them are 44 rare types of “annual fish” unique to the Cerrado whose short lives begin with spring rains and end with the summer heat. Scientists suspect that increasing dry spells could be interrupting their delicate reproduction cycles.

Other creatures, including rheas — giant ostrich-like birds — will soon join the endangered species list if nothing is done to reverse the slide, says Ricardo Machado, a zoology professor at the University of Brasilia. He said the birds’ numbers have plummeted due to loss of native ground cover critical to breeding and nesting.

Machado worries that unique Cerrado plants, insects and other creatures may vanish before scientists have an opportunity to identify them, much less study them.

“There is a universe to be discovered,” Machado said. “All attention is focused on the Amazon, no one speaks for the Cerrado.”

Reining in the soy boom

That’s beginning to change.

Dozens of groups, including Greenpeace, the World Wildlife Foundation and the Brazilian research group IPAM, last year began pushing for large multinationals to protect the biome. In a document known as the Cerrado Manifesto, they called for immediate action to stop deforestation in the region.

More than 60 companies, including McDonalds, Unilever and Walmart, have signed on so far. The firms have agreed to support measures that would eliminate native vegetation loss in the Cerrado from their supply chains. But in contrast to the 2006 Amazon soy moratorium, the Cerrado Manifesto did not commit signatories to halt purchases of farm products from newly deforested areas.

Walmart and Unilever said they are committed to achieving zero net deforestation in their supply chains by 2020, meaning any destruction in one region would be offset by recuperation of similar forest elsewhere. Walmart said all its beef suppliers in the Cerrado are monitored to ensure they don’t contribute to deforestation there. McDonalds didn’t respond to a request for comment.

Separately, Netherlands-based Louis Dreyfus Company in June became the first major commodity trader to pledge to stop buying soy from newly deforested land specifically in the Cerrado. The company gave no timetable, but said it would work to establish a “realistic target date” to end deforestation in its Cerrado supply chain.

Brazil’s former Minister of Environment Jose Sarney Filho, who recently left office to run for Senate, has proposed an international effort to compensate landowners who preserve natural habitat. He raised the issue at last November’s global climate summit in Germany, but the effort has yet to attract major backers.

Farmer Pansera, meanwhile, sees big things ahead for his patch of the Cerrado. Supervising the harvest on his land earlier this year, he watched a pair of combines chew through rows of soybean plants. The giant machines stripped away the beans and spit them into empty grain trucks rolling just behind to catch the bounty.

He said there is no future without growth, and the frontier region of Matopiba is just getting started. He plans to plant an additional 180 hectares of soy next year on newly cleared land.

“There is still a large area to be opened,” Pansera said. “It will be one of the great centers of Brazilian agriculture.”
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India said on Tuesday it expected to spend less than 100 billion rupees ($1.43 billion) on its first manned space mission to be launched by 2022, suggesting it is likely to be cheaper than similar projects by the United States and China.

India is cultivating a reputation as a low-cost space power, after the 2014 launch of an unmanned Mars mission at a cost of $74 million, or less than the budget of the Hollywood space blockbuster Gravity and a fraction of the $671 million the U.S. space agency NASA spent on its MAVEN Mars mission.

The Indian manned mission, announced this month by Prime Minister Narendra Modi and to be led by the Indian Space Research Organization (ISRO), will aim to send a three-member crew to space for five to seven days in a craft that will be placed in a low Earth orbit of 300-400 km, the Department of Space said in a statement.

“ISRO has developed some critical technologies like re-entry mission capability, crew escape system, crew module configuration, thermal protection system, deceleration and floatation system, sub-systems of life support system etc required for this program,” the statement said.

ISRO Chairman K. Sivan said the agency had “perfected the engineering aspects of the mission,” although it was new to the field of bioscience — dealing with living beings.

Private agencies will also participate in the mission, and ISRO might consider collaborations with space agencies from “friendly countries with advanced space programs,” the statement added.

India’s neighbor and old rival China first sent humans to space in 2003, becoming only the third country to have such capability after Russia and the United States.

China’s Shenzhou program is secretively run through military and government agencies and its budget is not public. In 2003, officials said it had cost 18 billion yuan ($2.62 billion).

India’s space program has a total budget of around $4 billion, and Modi’s government hopes recent satellite launches — many on behalf of foreign governments — would improve its prospects of winning a larger share of the more than $300 billion global space industry.

Earlier this month, NASA unveiled its analysis of data collected from lunar orbit by an Indian spacecraft. The findings marked the first time scientists confirmed by direct observation the presence of water on the moon’s surface — in hundreds of patches of ice deposited in the darkest and coldest reaches of its polar regions.
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Sizzling weather this summer will put pressure on almost 200 governments to reach a deal in Poland in December on the details of a global plan to limit climate change, the incoming president of the U.N. talks said.

Environment ministers will meet in Katowice, the heart of Poland’s coal-producing region, Silesia, to agree on rules for the 2015 Paris climate accord. That accord set a sweeping goal of ending the fossil fuel era this century, but the text was vague on details.

“Paris is empty without Katowice,” Michal Kurtyka, a former deputy energy minister of Poland who will preside at the December 3-14 talks, told Reuters.

Poland, which generates most of its electricity from coal, is hosting the annual U.N. climate talks for the third time.

“The Paris Agreement includes certain principles. However, the way they will be implemented will be described in the Katowice package. So the more detailed and concrete it is, the better,” Kurtyka said.

Hot weather this summer that set off wildfires from California to Greece has made officials more determined to reach a detailed deal in Katowice, he said.

“For sure this is something that affected millions of people all over the world. … Societies in particular countries will act on politicians. I think that this will increase political determination for the solutions to be as concrete and as

detailed as possible,” Kurtyka said.

Bangkok session

Many issues remain to be discussed at an extra session in Bangkok next month, he said, where “a vision of the whole should be built.”

Some of the sticking points include the way the countries report on their emission reductions, adapting to climate change and financing tools, he said.

Environmentalists have complained about foot-dragging by the countries involved. French Environment Minister Nicolas Hulot resigned Tuesday in frustration over sluggish progress on climate goals.

Writing the “rule book” — formally known as “implementation guidelines” — is the biggest test of the international commitment to the Paris Agreement since President Donald Trump said in June last year that he would pull the United States out.

“If some countries, such as for example the U.S., conclude that they are not ready to follow the Paris Agreement direction, then I’d assume that all other countries will seek to keep their presence so that they are part of the agreement,” Kurtyka said.

“I will strive for all parties to become signatories, whereas the question I will ask at the end will be: ‘Do I hear a voice of objection?’ I hope not.”

The choice of Poland for the climate talks is itself a point of contention, because of its dependence on coal. In February, the European Union’s top court said the country had failed to uphold air-quality standards, one of several environmental conflicts between Poles and the EU.

“The opinions that Poland is not a reliable climate talks host, due to the significant share of coal in power production, are formulated from the EU perspective. The world is more diverse than that,” Kurtyka said.

Kurtyka was appointed the climate talks president in April. He replaced the former Environment Minister Jan Szyszo, who had been initially named to preside at the conference in Katowice.

Szyszko had approved the increased logging in the ancient Bialowieza Forest in 2016, another of Poland’s conflicts with the European Union.
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India’s federal health ministry called Tuesday for stopping the sale or import of electronic cigarettes and heat-not-burn tobacco devices that companies like Philip Morris International Inc. were planning to launch in the country.

India has stringent laws to deter tobacco use, which the government says kills more than 900,000 people every year. But the country still has 106 million adult smokers, second only to China, according to the World Health  Organization.

In an advisory to state governments, the health ministry said such devices were a “great health risk” and it was possible that children and nonsmokers using such products could switch to cigarettes once they became addicted to nicotine.

The government took a position on such products with tobacco giant Philip Morris planning to launch its iQOS smoking device in India. Reuters reported in June that Philip Morris was working toward achieving iQOS’s acceptability as a reduced-risk product in the country.

Philip Morris says the sleek, penlike iQOS heats but does not burn tobacco, producing a nicotine-containing vapor rather than smoke and making it less harmful than conventional cigarettes. The company wants to one day stop selling cigarettes altogether.

The health ministry asked Indian states to “ensure” that electronic nicotine delivery systems including e-cigarettes — devices that use a nicotine-laced liquid — and heat-not-burn devices are not sold, manufactured, imported or advertised.

Such devices, the ministry said, “are a great health risk to public at large, especially to children, adolescents, pregnant women and women of reproductive age.”

Philip Morris did not respond to Reuters queries. ITC, India’s leading cigarette maker, which also sells e-cigarettes, also did not respond.

A senior health official said the government was “sending a strong message” about how such products are harmful for the public.

Last year, a New Delhi resident filed public interest litigation in the Delhi High Court calling for regulation of e-cigarettes. The court last week asked the federal health ministry to say when it would announce regulatory measures for such devices.

“The case was filed to bring out the absolute absence of regulation. It is now critical that stringent implementation measures are taken,” said Bhuvanesh Sehgal, a Delhi-based lawyer who argued in the case.

In recent years, the Indian government has intensified its tobacco-control efforts, raising cigarette taxes, ordering companies to print bigger health warnings on packs and introducing a quit-smoking helpline.
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Indonesia produces an estimated 1.3 million tons of plastic every day, much of which ends up in the oceans, clogging the ecosystem and killing wildlife. Last year the country pledged to cut the amount it throws into the sea by 70 percent by 2025. As Jack Hewson reports, the sea itself could help to solve the problem.
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President Emmanuel Macron suffered a major political blow Tuesday as his popular environment minister resigned live on radio — without informing the French leader beforehand.

Nicolas Hulot, one of the most respected members of the Cabinet among the French public, took even his interviewers by surprise on the France Inter radio station when announcing his move.

“I am taking the decision to leave the government,” Hulot said, adding that he felt “all alone” on environmental issues within the government.

The 63-year-old TV celebrity, who made his name as an environmental campaigner, was lured into government last year by Macron, but has repeatedly clashed with his cabinet colleagues over policy.

“We’re taking little steps, and France is doing a lot more than other countries, but are little steps enough?… the answer is no,” he added.

Hulot, whose future in the government has been a subject of speculation for months, said he had not informed Macron or Prime Minister Edouard Philippe of his plans to resign.

“It’s an honest and responsible decision,” he added.

His departure adds to mounting problems for 40-year-old centrist Macron, who swept to power in May last year promising to solve decades of low growth and high unemployment in France and reform the European Union.

Due to slowing economic growth, his government is having difficulties drawing up the 2019 budget which saw Prime Minister Philippe announce at the weekend that he was dropping targets for reducing the deficit.

At the diplomatic level, Macron is struggling to convince his European partners of the need for a more integrated EU as nationalist governments make gains across the continent.

Over the summer, the former banker also suffered the first major political scandal of his 15-month term when a senior security aide was filmed manhandling protesters while wearing a police helmet.

Anger in government

Hulot’s announcement is likely to be received bitterly by Macron, who was starting a trip to Denmark to sell his EU agenda on Tuesday.

“The most basic of courtesies would have been to warn the president of the republic and the prime minister,” government spokesman Benjamin Griveaux told the BFM news channel.

Hulot was formerly the star presenter of the hit Ushuaia environmental TV programme in France and had repeatedly turned down offers to enter government by previous French presidents.

He was widely reported to be close to quitting in February after media reports that the granddaughter of former French president Francois Mitterrand had accused him of rape in the 1990s.

Hulot furiously denied the claims and said they had been extremely hurtful for him and his family.

He had also faced criticism from fellow green campaigners, who accused him of failing to influence the Macron government sufficiently after he lost battles with his colleagues in the agriculture and economy ministries.

Hulot was left disappointed when the government backtracked on a target to reduce the share of nuclear power in the country’s energy mix to 50 percent by 2025, while EU negotiations on pesticides were another source of frustration.

On Monday, the cost of a hunting licence was cut in half to 200 euros — another bitter pill for the vegetarian.

“Do you do an environmental revolution in one year? The response is no,” government spokesman Griveaux added. “I prefer little steps to not moving.”

Macron’s record on the environment is mixed.

He has made the battle against global warming one of his foreign policy priorities, organizing a major conference in Paris last year in an effort to compensate for Trump’s scepticism about climate change.

He also led efforts at the EU level to reduce the use of the controversial weedkiller chemical glyphosate and he scrapped a proposed airport in western France, partly on environmental grounds.

Macron’s political opponents immediately seized on the resignation.

“I don’t necessarily share the same opinions as Nicolas Hulot, but I can understand that he feels betrayed today, like a lot of French people, by the strong promises that were made and the sense that in the end they have not been kept,” said Laurent Wauquiez, the head of the rightwing Republicans party.

 

 

 
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President Trump recently proposed cuts to the Clean Power Plan. The Obama-era plan aims to generate electricity with less coal and more renewable energy and slash carbon emissions from the nation’s power plants by about one-third by 2030. Trump’s proposal was criticized by environmentalists but applauded in West Virginia, where coal mining jobs are vital to the economy. White House Correspondent Patsy Widakuswara reports.
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Taking a low-dose of aspirin every day has been known to help people who have already had a heart attack. But major new research has found the risks do not outweigh the benefits for most other people. Faith Lapidus has details.
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Ancient periods of cold and dry climate helped our species replace Neanderthals in Europe, a study suggests.

Researchers found that such cold periods coincided with an apparent disappearance of our evolutionary cousins in different parts of the continent, and the appearance of our species, Homo sapiens.

“Whether they moved or died out, we can’t tell,” said Michael Staubwasser of the University of Cologne in Germany.

Neanderthals once lived in Europe and Asia but died out about 40,000 years ago, just a few thousand years after our species, Homo sapiens, arrived in Europe. Scientists have long debated what happened, and some have blamed the change in climate. Other proposed explanations have included epidemics and the idea that the newcomers edged out the Neanderthals for resources.

Staubwasser and colleagues reported their findings Monday in the Proceedings of the National Academy of Sciences. They drew on existing climate, archaeological and ecological data and added new indicators of ancient climate from studies of two caves in Romania.

Their study highlighted two cold and dry periods. One began about 44,000 years ago and lasted about 1,000 years. The other began about 40,800 years ago and lasted six centuries. The timing of those events matches the periods when artifacts from Neanderthals disappear and signs of H. sapiens appear in sites within the Danube River valley and in France, they noted.

The climate shifts would have replaced forest with shrub-filled grassland, and H. sapiens may have been better adapted to that new environment than the Neanderthals were, so they could move in after Neanderthals disappeared, the researchers wrote.

Katerina Harvati, a Neanderthal expert at the University of Tuebingen in Germany who wasn’t involved in the study, said it’s helpful to have the new climate data from southeastern Europe, a region that H. sapiens is thought to have used to spread through the continent.

But she said it’s unclear whether Neanderthals disappeared and H. sapiens appeared at the times the authors indicate, because the studies they cite rely on limited evidence and are sometimes open to dispute.

Chris Stringer of the Natural History Museum in London said he thought the paper made a good case for an impact of the climate shifts on Neanderthals, although he believes other factors were also at work in their disappearance.

Rick Potts of the Smithsonian Institution called the study “a refreshing new look” at the species replacement. 

“As has been said before, our species didn’t outsmart the Neanderthals,” Potts said in an email. “We simply outsurvived them. The new paper offers much to contemplate about how it occurred.”
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