Hundreds of millions of Americans spent Wednesday seeking relief from some of the coldest weather ever recorded in the continental United States. 

Officials said temperatures were below the freezing mark in 85 percent of the country, excluding Alaska and Hawaii.

Chicago recorded a low temperature of about minus 23 degrees Fahrenheit (minus 30 Celsius) — not a record, but close to it. Minneapolis recorded minus 27 F (minus 32 C). In Sioux Falls, S.D., the mercury dropped to minus 25 F (minus 31 C).

Wind chills reportedly made it feel like minus 50 F (minus 45 C) or worse in several parts of the Midwest.

Downtown Chicago streets were largely deserted after most offices told employees to stay home. Trains and buses operated with few passengers; engineers set fires along tracks to keep commuter trains moving. The hardiest commuters ventured out only after covering nearly every square inch of flesh to protect against the extreme chill, which froze ice crystals on eyelashes and eyebrows in minutes.

The city used transit buses, with nurses on board, as emergency warming centers for the homeless.   

  

Doctors in Minneapolis said they were treating cases of what they called fourth-degree frostbite, in which limbs are frostbitten down to the bone.

Mail carriers, known for making deliveries through rain, sleet and snow, draw the line at life-threatening cold. The U.S. Postal Service canceled mail service in parts of 11 states Wednesday.

With nine weather-related deaths reported so far, the cold was spreading east into New England and the mid-Atlantic states. Commuters and schoolchildren could expect to wake up to temperatures in the single or low double digits Fahrenheit in Washington, Baltimore, New York and Boston.

Meteorologists blamed the weather on a breakup of the polar vortex — cold air above the North Pole that has been pushed south across North America because of a blast of desert heat from North Africa.

Experts said it was possible that climate change was playing a part in the extreme cold. But they said it was hard to pinpoint the cause of a single weather event such as this week’s cold blast.

“It is not out of bounds with the historical record,” University of Miami professor Ben Kirtman said. “You get storms that are bigger than other storms. There is a big part of this that is part of the natural variability of the climate.”

 

WATCH: Polar Vortex Sends Frigid Air Through North America

Government scientists said increased moisture in the atmosphere because of global warming might bring on a higher number of severe snowstorms in the winter and more powerful hurricanes in the summer.

This week’s cold weather will be just a memory within a few days. Forecasters predicted temperatures in the mid-40s F on Sunday and low 50s F on Monday in Chicago. In Washington, the temperatures are expected to be in the mid- to upper 50s for those two days.

Some information for this report from the Associated Press.
…

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Scientists using sophisticated techniques to determine the age of bone fragments, teeth and artifacts unearthed in a Siberian cave have provided new insight into a mysterious extinct human species that may have been more advanced than previously known. 

 

Research published Wednesday shed light on the species called Denisovans, known only from scrappy remains from Denisova Cave in the foothills of the Altai Mountains in Russia. 

 

While still enigmatic, they left a genetic mark on our species, Homo sapiens, particularly among indigenous populations in Papua New Guinea and Australia that retain a small but significant percentage of Denisovan DNA, evidence of past interbreeding between the species. 

 

Fossils and DNA traces demonstrated Denisovans were present in the cave from at least 200,000 to 50,000 years ago, and Neanderthals, a closely related extinct human species, were present there between 200,000 and 80,000 years ago, the new research found. Stone tools indicated one or both species may have occupied the cave starting 300,000 years ago.  

Scientists last year described a Denisova Cave bone fragment of a girl whose mother was a Neanderthal and father a Denisovan, evidence of interbreeding. The girl, nicknamed “Denny,” lived around 100,000 years ago, the new research showed. 

 

Pendants made of animal teeth and bone points from the cave were determined to be between 43,000 and 49,000 years old. They may have been crafted by Denisovans, suggesting a degree of intellectual sophistication. 

 

“Traditionally these objects are associated in Western Europe with the expansion of our species, and are seen as hallmarks of behavioral modernity, but in this case Denisovans may be their authors,” said archaeological scientist Katerina Douka of the Max Planck Institute for the Science of Human History in Germany. 

 

Our species arose in Africa roughly 300,000 years ago, later spreading worldwide. There is no evidence Homo sapiens had reached Denisova Cave when these objects were made. 

 

Denisovans are known only from three teeth and one finger bone. 

 

“New fossils would be especially welcome, as we know almost nothing about the physical appearance of Denisovans, aside from them having rather chunky teeth,” said geochronologist Zenobia Jacobs of the University of Wollongong in Australia.  

 

“Their DNA in modern Australian Aboriginal and New Guinean people tantalizingly suggests they may have been quite widespread in Asia, and possibly even southeast Asia, but we need to find some hard evidence of their presence in these regions to flesh out the full story of the Denisovans,” added University of Wollongong geochronologist Richard “Bert” Roberts.  

 

The research was published in the journal Nature.
…

your ads here!

Scientists using sophisticated techniques to determine the age of bone fragments, teeth and artifacts unearthed in a Siberian cave have provided new insight into a mysterious extinct human species that may have been more advanced than previously known. 

 

Research published Wednesday shed light on the species called Denisovans, known only from scrappy remains from Denisova Cave in the foothills of the Altai Mountains in Russia. 

 

While still enigmatic, they left a genetic mark on our species, Homo sapiens, particularly among indigenous populations in Papua New Guinea and Australia that retain a small but significant percentage of Denisovan DNA, evidence of past interbreeding between the species. 

 

Fossils and DNA traces demonstrated Denisovans were present in the cave from at least 200,000 to 50,000 years ago, and Neanderthals, a closely related extinct human species, were present there between 200,000 and 80,000 years ago, the new research found. Stone tools indicated one or both species may have occupied the cave starting 300,000 years ago.  

Scientists last year described a Denisova Cave bone fragment of a girl whose mother was a Neanderthal and father a Denisovan, evidence of interbreeding. The girl, nicknamed “Denny,” lived around 100,000 years ago, the new research showed. 

 

Pendants made of animal teeth and bone points from the cave were determined to be between 43,000 and 49,000 years old. They may have been crafted by Denisovans, suggesting a degree of intellectual sophistication. 

 

“Traditionally these objects are associated in Western Europe with the expansion of our species, and are seen as hallmarks of behavioral modernity, but in this case Denisovans may be their authors,” said archaeological scientist Katerina Douka of the Max Planck Institute for the Science of Human History in Germany. 

 

Our species arose in Africa roughly 300,000 years ago, later spreading worldwide. There is no evidence Homo sapiens had reached Denisova Cave when these objects were made. 

 

Denisovans are known only from three teeth and one finger bone. 

 

“New fossils would be especially welcome, as we know almost nothing about the physical appearance of Denisovans, aside from them having rather chunky teeth,” said geochronologist Zenobia Jacobs of the University of Wollongong in Australia.  

 

“Their DNA in modern Australian Aboriginal and New Guinean people tantalizingly suggests they may have been quite widespread in Asia, and possibly even southeast Asia, but we need to find some hard evidence of their presence in these regions to flesh out the full story of the Denisovans,” added University of Wollongong geochronologist Richard “Bert” Roberts.  

 

The research was published in the journal Nature.
…

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A major new study provides the strongest evidence yet that vaping can help smokers quit cigarettes, with e-cigarettes proving nearly twice as effective as nicotine gums and patches. 

 

The British research, published Wednesday in the New England Journal of Medicine, could influence what doctors tell their patients and shape the debate in the U.S., where the Food and Drug Administration has come under pressure to more tightly regulate the burgeoning industry amid a surge in teenage vaping. 

 

We know that patients are asking about e-cigarettes and many doctors haven't been sure what to say,'' said Dr. Nancy Rigotti, a tobacco treatment specialist at Harvard Medical School who was not involved in the study.I think they now have more evidence to endorse e-cigarettes.” 

 

At the same time, Rigotti and other experts cautioned that no vaping products have been approved in the U.S. to help smokers quit. 

Top cause of preventable death

 

Smoking is the No. 1 cause of preventable death worldwide, blamed for nearly 6 million deaths a year. Quitting is notoriously difficult, even with decades-old nicotine aids and newer prescription drugs. More than 55 percent of U.S. smokers try to quit each year, and only about 7 percent succeed, according to government figures. 

 

Electronic cigarettes, which have been available in the U.S. since about 2007 and have grown into a $6.6 billion-a-year industry, are battery-powered devices that typically heat a flavored nicotine solution into an inhalable vapor.  

  

Most experts agree the vapor is less harmful than cigarette smoke since it doesn’t contain most of the cancer-causing byproducts of burning tobacco. But there is virtually no research on the long-term effects of the chemicals in the vapor, some of which are toxic. 

 

At the same time, there have been conflicting studies on whether e-cigarettes actually help smokers kick the habit. Last year, an influential panel of U.S. experts concluded there was only “limited evidence” of their effectiveness.  

In the new study, researchers tracked nearly 900 middle-age smokers who were randomly assigned to receive either e-cigarettes or nicotine replacement products, including patches, gums and lozenges. After one year, 18 percent of e-cigarette users were smoke-free, versus 9.9 percent of those using the other products.  

  

“Anything which helps smokers to avoid heart disease and cancer and lung disease is a good thing, and e-cigarettes can do that,” said Peter Hajek, study co-author and an addiction specialist at Queen Mary University of London. 

More rigorous

 

The study was more rigorous than previous ones, which largely surveyed smokers about e-cigarette use. Participants in this experiment underwent chemical breath testing. 

 

Smokers in the e-cigarette group received a $26 starter kit, while those in the nicotine-replacement group received a three-month supply of the product of their choice, costing about $159. Participants were responsible for buying follow-up supplies. 

 

“If you have a method of helping people with smoking cessation that is both more effective and less costly, that should be of great interest to anyone providing health services,” said Kenneth Warner, a retired University of Michigan public health professor who was not involved in the study. 

 

Several factors may have boosted the results: All the participants were recruited from a government smoking-cessation program and were presumably motivated to quit. They also received four weeks of anti-smoking counseling.  

  

The researchers didn’t test e-cigarettes against new drugs such as Pfizer’s Chantix, which has shown higher rates of success than older nicotine-based treatments. 

 

Funding for the study came from the British government, which has embraced e-cigarettes as a potential tool to combat smoking through state-run health services. Some of the authors have been paid consultants to makers of anti-smoking products. 

Long-term questions

 

U.S. health authorities have been more reluctant about backing the products, in part because of the long-term effects are unknown. 

 

“We need more studies about their safety profile, and I don’t think anyone should be changing practice based on one study,” said Belinda Borrelli, a psychologist specializing in smoking cessation at Boston University. 

 

The American Heart Association backed e-cigarettes in 2014 as a last resort to help smokers quit after trying counseling and approved products. The American Cancer Society took a similar position last year. 

 

An editorial accompanying the study and co-written by Borrelli recommended e-cigarettes only after smokers have tried and failed to quit with FDA-approved products. Also, doctors should have a clear timeline for stopping e-cigarette use. 

 

Borrelli noted that after one year, 80 percent of the e-cigarette users in the study were still using the devices. Nine percent of the participants in the other group were still using gums and other nicotine-replacement products.    

No vaping company has announced plans to seek FDA approval of its products as a quit-smoking aid. Winning such an endorsement would require large studies that can take years and cost millions of dollars. 

 

The FDA has largely taken a hands-off approach toward vaping. It has not scientifically reviewed any of the e-cigarettes on the market and has put off some key regulations until 2022. FDA Commissioner Scott Gottlieb has said he doesn’t want to over-regulate an emerging industry that could provide a safer option for adult smokers. 

 

The delay has come under intense criticism amid an explosion in teenage vaping, driven chiefly by devices like Juul, which resembles a flash drive. Federal law prohibits sales to those under 18, but 1 in 5 high school students reported vaping last year, according to a government survey. It showed teenage use surged 78 percent from 2017 to 2018. 

Tank vs. cartridge

 

Matthew Myers of the Campaign for Tobacco-Free Kids noted that the British study used so-called tank-based e-cigarettes, which allow users to customize their flavors and nicotine levels. Those devices have largely been overtaken in the U.S. by Juul and similar devices that have prefilled nicotine cartridges, or pods. Any benefit of e-cigarettes depends on the individual product and how it is used, he said. 

 

It is a fundamental mistake to think that all e-cigarettes are alike,'' Myers said.And in the absence of FDA regulation, a consumer has no way of knowing if the product they are using has the potential to help them or not.” 

 

Myers’ group is one of several anti-smoking organizations suing the FDA to immediately begin reviewing e-cigarettes. 

 

Ian Armitage was skeptical about e-cigarettes as a way to stop smoking, saying he tried vaping several years ago but gave it up after experiencing twitching and shakes from nicotine withdrawal. 

 

I tried it for a whole month, but it just wasn't doing it for me,'' said Armitage, an audio-visual technician in Washington.I still wanted a cigarette afterward.” 

 

Armitage, who has smoked for 15 years, said he also tried nicotine patches but found they irritated his skin.
…

your ads here!

A major new study provides the strongest evidence yet that vaping can help smokers quit cigarettes, with e-cigarettes proving nearly twice as effective as nicotine gums and patches. 

 

The British research, published Wednesday in the New England Journal of Medicine, could influence what doctors tell their patients and shape the debate in the U.S., where the Food and Drug Administration has come under pressure to more tightly regulate the burgeoning industry amid a surge in teenage vaping. 

 

We know that patients are asking about e-cigarettes and many doctors haven't been sure what to say,'' said Dr. Nancy Rigotti, a tobacco treatment specialist at Harvard Medical School who was not involved in the study.I think they now have more evidence to endorse e-cigarettes.” 

 

At the same time, Rigotti and other experts cautioned that no vaping products have been approved in the U.S. to help smokers quit. 

Top cause of preventable death

 

Smoking is the No. 1 cause of preventable death worldwide, blamed for nearly 6 million deaths a year. Quitting is notoriously difficult, even with decades-old nicotine aids and newer prescription drugs. More than 55 percent of U.S. smokers try to quit each year, and only about 7 percent succeed, according to government figures. 

 

Electronic cigarettes, which have been available in the U.S. since about 2007 and have grown into a $6.6 billion-a-year industry, are battery-powered devices that typically heat a flavored nicotine solution into an inhalable vapor.  

  

Most experts agree the vapor is less harmful than cigarette smoke since it doesn’t contain most of the cancer-causing byproducts of burning tobacco. But there is virtually no research on the long-term effects of the chemicals in the vapor, some of which are toxic. 

 

At the same time, there have been conflicting studies on whether e-cigarettes actually help smokers kick the habit. Last year, an influential panel of U.S. experts concluded there was only “limited evidence” of their effectiveness.  

In the new study, researchers tracked nearly 900 middle-age smokers who were randomly assigned to receive either e-cigarettes or nicotine replacement products, including patches, gums and lozenges. After one year, 18 percent of e-cigarette users were smoke-free, versus 9.9 percent of those using the other products.  

  

“Anything which helps smokers to avoid heart disease and cancer and lung disease is a good thing, and e-cigarettes can do that,” said Peter Hajek, study co-author and an addiction specialist at Queen Mary University of London. 

More rigorous

 

The study was more rigorous than previous ones, which largely surveyed smokers about e-cigarette use. Participants in this experiment underwent chemical breath testing. 

 

Smokers in the e-cigarette group received a $26 starter kit, while those in the nicotine-replacement group received a three-month supply of the product of their choice, costing about $159. Participants were responsible for buying follow-up supplies. 

 

“If you have a method of helping people with smoking cessation that is both more effective and less costly, that should be of great interest to anyone providing health services,” said Kenneth Warner, a retired University of Michigan public health professor who was not involved in the study. 

 

Several factors may have boosted the results: All the participants were recruited from a government smoking-cessation program and were presumably motivated to quit. They also received four weeks of anti-smoking counseling.  

  

The researchers didn’t test e-cigarettes against new drugs such as Pfizer’s Chantix, which has shown higher rates of success than older nicotine-based treatments. 

 

Funding for the study came from the British government, which has embraced e-cigarettes as a potential tool to combat smoking through state-run health services. Some of the authors have been paid consultants to makers of anti-smoking products. 

Long-term questions

 

U.S. health authorities have been more reluctant about backing the products, in part because of the long-term effects are unknown. 

 

“We need more studies about their safety profile, and I don’t think anyone should be changing practice based on one study,” said Belinda Borrelli, a psychologist specializing in smoking cessation at Boston University. 

 

The American Heart Association backed e-cigarettes in 2014 as a last resort to help smokers quit after trying counseling and approved products. The American Cancer Society took a similar position last year. 

 

An editorial accompanying the study and co-written by Borrelli recommended e-cigarettes only after smokers have tried and failed to quit with FDA-approved products. Also, doctors should have a clear timeline for stopping e-cigarette use. 

 

Borrelli noted that after one year, 80 percent of the e-cigarette users in the study were still using the devices. Nine percent of the participants in the other group were still using gums and other nicotine-replacement products.    

No vaping company has announced plans to seek FDA approval of its products as a quit-smoking aid. Winning such an endorsement would require large studies that can take years and cost millions of dollars. 

 

The FDA has largely taken a hands-off approach toward vaping. It has not scientifically reviewed any of the e-cigarettes on the market and has put off some key regulations until 2022. FDA Commissioner Scott Gottlieb has said he doesn’t want to over-regulate an emerging industry that could provide a safer option for adult smokers. 

 

The delay has come under intense criticism amid an explosion in teenage vaping, driven chiefly by devices like Juul, which resembles a flash drive. Federal law prohibits sales to those under 18, but 1 in 5 high school students reported vaping last year, according to a government survey. It showed teenage use surged 78 percent from 2017 to 2018. 

Tank vs. cartridge

 

Matthew Myers of the Campaign for Tobacco-Free Kids noted that the British study used so-called tank-based e-cigarettes, which allow users to customize their flavors and nicotine levels. Those devices have largely been overtaken in the U.S. by Juul and similar devices that have prefilled nicotine cartridges, or pods. Any benefit of e-cigarettes depends on the individual product and how it is used, he said. 

 

It is a fundamental mistake to think that all e-cigarettes are alike,'' Myers said.And in the absence of FDA regulation, a consumer has no way of knowing if the product they are using has the potential to help them or not.” 

 

Myers’ group is one of several anti-smoking organizations suing the FDA to immediately begin reviewing e-cigarettes. 

 

Ian Armitage was skeptical about e-cigarettes as a way to stop smoking, saying he tried vaping several years ago but gave it up after experiencing twitching and shakes from nicotine withdrawal. 

 

I tried it for a whole month, but it just wasn't doing it for me,'' said Armitage, an audio-visual technician in Washington.I still wanted a cigarette afterward.” 

 

Armitage, who has smoked for 15 years, said he also tried nicotine patches but found they irritated his skin.
…

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Rescuers are moving hundreds of dehydrated lesser flamingo chicks from their breeding ground at a drought-stricken South African dam to a bird sanctuary in Cape Town, to save them from death by starvation and lack of water. 

 

Their birthplace, Kamfers Dam in the Northern Cape, is one of only three breeding grounds for the famously pink birds in southern Africa, the other two being in Namibia and Botswana, according to researcher Katta Ludynia.  

The rescued chicks take three to four months to fledge, and it is not yet clear whether they will eventually be released back into the wild in Cape Town or transported back hundreds of kilometers to their home in Kimberley, she said. 

 

“There are still several thousand birds breeding in the dam in areas that still have water,” said Katta Ludynia, research manager at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB). “It now depends on the water levels whether these birds will pull through.” 

 

Ludynia said the sanctuary was caring for around 550 chicks, most of them dehydrated when they arrived Monday after having been abandoned by parents who went off in search of food. 

 

The chicks are being moved to the sanctuary by plane and road.  

SANCCOB is one of several centers across South Africa caring for around 2,000 chicks that were rescued from the dam. 

 

Although it hosts the biggest population of lesser flamingoes in southern Africa, Kamfers Dam, north of Kimberley, is often dry and depends mainly on rainwater. It also gets some water from a sewerage works that releases water into its wetlands. 

“The dam in Kimberley is so important because it is manageable, so we can secure the water level there. That might be the only site the flamingos can breed in southern Africa, if the drought continues in other areas,” Ludynia said.
…

your ads here!

Rescuers are moving hundreds of dehydrated lesser flamingo chicks from their breeding ground at a drought-stricken South African dam to a bird sanctuary in Cape Town, to save them from death by starvation and lack of water. 

 

Their birthplace, Kamfers Dam in the Northern Cape, is one of only three breeding grounds for the famously pink birds in southern Africa, the other two being in Namibia and Botswana, according to researcher Katta Ludynia.  

The rescued chicks take three to four months to fledge, and it is not yet clear whether they will eventually be released back into the wild in Cape Town or transported back hundreds of kilometers to their home in Kimberley, she said. 

 

“There are still several thousand birds breeding in the dam in areas that still have water,” said Katta Ludynia, research manager at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB). “It now depends on the water levels whether these birds will pull through.” 

 

Ludynia said the sanctuary was caring for around 550 chicks, most of them dehydrated when they arrived Monday after having been abandoned by parents who went off in search of food. 

 

The chicks are being moved to the sanctuary by plane and road.  

SANCCOB is one of several centers across South Africa caring for around 2,000 chicks that were rescued from the dam. 

 

Although it hosts the biggest population of lesser flamingoes in southern Africa, Kamfers Dam, north of Kimberley, is often dry and depends mainly on rainwater. It also gets some water from a sewerage works that releases water into its wetlands. 

“The dam in Kimberley is so important because it is manageable, so we can secure the water level there. That might be the only site the flamingos can breed in southern Africa, if the drought continues in other areas,” Ludynia said.
…

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South Africa’s coal-mining heartland has the worst air quality in the world, according to a recent study by environmental organization Greenpeace. The 12 large coal mines in this area make it the world’s hotspot for toxic nitrogen dioxide emissions. Residents and health experts say the effects of this are ruining their health and their lives. VOA’s Anita Powell went to the coal heartland of Middelburg, South Africa, and filed this report.
…

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South Africa’s coal-mining heartland has the worst air quality in the world, according to a recent study by environmental organization Greenpeace. The 12 large coal mines in this area make it the world’s hotspot for toxic nitrogen dioxide emissions. Residents and health experts say the effects of this are ruining their health and their lives. VOA’s Anita Powell went to the coal heartland of Middelburg, South Africa, and filed this report.
…

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South Korea’s initial attempt at countermeasures to end the country’s current fine dust problem failed this week. Officials had sought to create artificial rain to address the current heavy air pollution many in Seoul blame on neighboring China. It’s an issue becoming more and more critical for residents.

Kim Byung-gon, a Professor at Gangneung-Wonju National University Department of Atmospheric and Environmental Sciences told VOA that while fine dust particles from China are part of the problem, it isn’t the only thing causing South Korea’s bad air.

“Fine dust occurs when pollutants emitted from China and internal (South Korean) pollutants stay in the air,” said Kim, who also noted that the exact cause of Seoul’s pollution problem has yet to be fully identified.

Dong Jong-in, a professor in the Department of Atmospheric and Environmental Sciences at the University of Seoul, said that while domestic factors do affect the overall particulate matter in the air, “fine dust that has flowed from the outside [the country] in the upper air stream is the key factor.”

As a result of continued concern by residents about the on-going increase in bad air quality days, South Korean President Moon Jae-in has announced that resolving the country’s fine dust problem will be one of the policy tasks his administration will undertake.

Choking on air

For three consecutive days in mid-January, the South Korean government issued alerts to citizens, warning of high levels of micro-dust in the air and urging them to stay inside, or if they had to be outside, to wear masks and keep exposure to a minimum.

During these days, thick, fine dust blanketed most of the country. The pollution was not only visible to the naked eye, but could be felt in the back of one’s throat according to one resident who spoke to South Korea’s Yonhap News.

“The air is so murky and my throat hurts that I even feel depressed. It’s as if there is a really thick fog,” the individual said.

Dong Jong-in said the air over the Korean peninsula had been quite dusty for some time. South Korean authorities had monitored overall dust levels and saw some improvement between 2012 and 2013, but since then and the inclusion of PM2.5 particles (ultrafine dust particles that are considered hazardous) in 2015 there has been a marked increase in pollution levels.

“As coal fuel use increases in China, patterns of ultrafine dust rise when west-winds blow. In the past, this was only a problem in winter, but the dusty season has widened to the late autumn and spring,” said Dong.

This is a concern, said Kim Byung-gon, because there are risks that come with increased exposure. “[World Health Organization] studies have indicated that it (ultrafine dust) acts as a primary carcinogen.”

Dong added that the “fine dust affects not only the respiratory system, but also blood vessels, heart, is implicated with brain disease, and dementia… it will also harm children and pregnant women.”

Resolving the problem

Last week, a plane flew into the airspace west of Seoul carrying silver iodide, a chemical that helps water droplets form in clouds. Authorities say it released 24 bursts of the chemical above clouds in hopes of inducing rain.

The Korea Meteorological Administration (KMA) said the initial results were “disappointing.”

While the KMA did detect a weak, misty rain for several minutes, “there was no observation of significant precipitation.”

“Aside from its success or failure, the test was an opportunity to accumulate the necessary technology for faster commercialization of cloud seeding,” the KMA added.

The agency is expected to release a full report next month and to carry out 14 more tests this year in hopes of perfecting the technology by 2024.

Kim Byung-gon said the government’s plan does have some merit, since several countries around the globe employ such tactics.

However, “Artificial rainfall itself is difficult,” Kim said, “a sufficient amount of rain should be falling to wash away the dust… I do not think it will be easy.”

He added that utilizing cleaner fuel, reducing automobile emission pollutants, and addressing factory pollutants must also be part of any solution to the problem at hand.

Lee Ju-Hyun contributed to this report.
…

your ads here!

South Korea’s initial attempt at countermeasures to end the country’s current fine dust problem failed this week. Officials had sought to create artificial rain to address the current heavy air pollution many in Seoul blame on neighboring China. It’s an issue becoming more and more critical for residents.

Kim Byung-gon, a Professor at Gangneung-Wonju National University Department of Atmospheric and Environmental Sciences told VOA that while fine dust particles from China are part of the problem, it isn’t the only thing causing South Korea’s bad air.

“Fine dust occurs when pollutants emitted from China and internal (South Korean) pollutants stay in the air,” said Kim, who also noted that the exact cause of Seoul’s pollution problem has yet to be fully identified.

Dong Jong-in, a professor in the Department of Atmospheric and Environmental Sciences at the University of Seoul, said that while domestic factors do affect the overall particulate matter in the air, “fine dust that has flowed from the outside [the country] in the upper air stream is the key factor.”

As a result of continued concern by residents about the on-going increase in bad air quality days, South Korean President Moon Jae-in has announced that resolving the country’s fine dust problem will be one of the policy tasks his administration will undertake.

Choking on air

For three consecutive days in mid-January, the South Korean government issued alerts to citizens, warning of high levels of micro-dust in the air and urging them to stay inside, or if they had to be outside, to wear masks and keep exposure to a minimum.

During these days, thick, fine dust blanketed most of the country. The pollution was not only visible to the naked eye, but could be felt in the back of one’s throat according to one resident who spoke to South Korea’s Yonhap News.

“The air is so murky and my throat hurts that I even feel depressed. It’s as if there is a really thick fog,” the individual said.

Dong Jong-in said the air over the Korean peninsula had been quite dusty for some time. South Korean authorities had monitored overall dust levels and saw some improvement between 2012 and 2013, but since then and the inclusion of PM2.5 particles (ultrafine dust particles that are considered hazardous) in 2015 there has been a marked increase in pollution levels.

“As coal fuel use increases in China, patterns of ultrafine dust rise when west-winds blow. In the past, this was only a problem in winter, but the dusty season has widened to the late autumn and spring,” said Dong.

This is a concern, said Kim Byung-gon, because there are risks that come with increased exposure. “[World Health Organization] studies have indicated that it (ultrafine dust) acts as a primary carcinogen.”

Dong added that the “fine dust affects not only the respiratory system, but also blood vessels, heart, is implicated with brain disease, and dementia… it will also harm children and pregnant women.”

Resolving the problem

Last week, a plane flew into the airspace west of Seoul carrying silver iodide, a chemical that helps water droplets form in clouds. Authorities say it released 24 bursts of the chemical above clouds in hopes of inducing rain.

The Korea Meteorological Administration (KMA) said the initial results were “disappointing.”

While the KMA did detect a weak, misty rain for several minutes, “there was no observation of significant precipitation.”

“Aside from its success or failure, the test was an opportunity to accumulate the necessary technology for faster commercialization of cloud seeding,” the KMA added.

The agency is expected to release a full report next month and to carry out 14 more tests this year in hopes of perfecting the technology by 2024.

Kim Byung-gon said the government’s plan does have some merit, since several countries around the globe employ such tactics.

However, “Artificial rainfall itself is difficult,” Kim said, “a sufficient amount of rain should be falling to wash away the dust… I do not think it will be easy.”

He added that utilizing cleaner fuel, reducing automobile emission pollutants, and addressing factory pollutants must also be part of any solution to the problem at hand.

Lee Ju-Hyun contributed to this report.
…

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For the first time, scientists have linked climate change to the mass migration flows that followed the Arab Spring in North Africa and the Middle East a few years ago.

According to scientists from the International Institute for Applied Systems Analysis in Austria, water shortages and droughts contributed to the Arab Spring conflicts, particularly in Syria, which remains mired in a civil war.

“People started not being able to produce agricultural production, and that was the start of migration from the rural areas to urban areas, which were already quite crowded. And the resources in the urban areas were also scarce. So with that kind of tension, fighting for limited resources, and on top is the ethnic polarization in Syria. So, it’s sort of all that combination,” said Raya Muttarak, of the University of East Anglia in Britain. She co-authored a report on the subject.

The researchers used United Nations’ data on asylum applications and conflict-related deaths. They combined this with data on drought and rainfall, plus other variables like population size and measures of democracy and ethnic diversity. All the figures were combined in a mathematical model. 

“So, let’s look at how climate affects the probability of conflict. And once we estimate that we use the number that we got from that to estimate the next step. So, the countries that experience conflict from climate variation — are they likely to send out the refugee flows or not?” explained Muttarak.

She said that climate change would not cause conflict and subsequent asylum-seeking flows everywhere.

“The effect of climate on migration, through conflict, is quite specific to certain time periods and to certain countries. So, climate-induced conflict, it’s a bit more likely in a country with a medium level of democracy.”

The results of this study are specific to the western Asia region. However, researchers say they hope the study will contribute to the global debate on how migration flows will be affected by increasingly severe climate change.
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For the first time, scientists have linked climate change to the mass migration flows that followed the Arab Spring in North Africa and the Middle East a few years ago.

According to scientists from the International Institute for Applied Systems Analysis in Austria, water shortages and droughts contributed to the Arab Spring conflicts, particularly in Syria, which remains mired in a civil war.

“People started not being able to produce agricultural production, and that was the start of migration from the rural areas to urban areas, which were already quite crowded. And the resources in the urban areas were also scarce. So with that kind of tension, fighting for limited resources, and on top is the ethnic polarization in Syria. So, it’s sort of all that combination,” said Raya Muttarak, of the University of East Anglia in Britain. She co-authored a report on the subject.

The researchers used United Nations’ data on asylum applications and conflict-related deaths. They combined this with data on drought and rainfall, plus other variables like population size and measures of democracy and ethnic diversity. All the figures were combined in a mathematical model. 

“So, let’s look at how climate affects the probability of conflict. And once we estimate that we use the number that we got from that to estimate the next step. So, the countries that experience conflict from climate variation — are they likely to send out the refugee flows or not?” explained Muttarak.

She said that climate change would not cause conflict and subsequent asylum-seeking flows everywhere.

“The effect of climate on migration, through conflict, is quite specific to certain time periods and to certain countries. So, climate-induced conflict, it’s a bit more likely in a country with a medium level of democracy.”

The results of this study are specific to the western Asia region. However, researchers say they hope the study will contribute to the global debate on how migration flows will be affected by increasingly severe climate change.
…

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The mass migration flows that followed the Arab Spring in North Africa and the Middle East were partly caused by climate change, according to new research. Scientists from the International Institute for Applied Systems Analysis in Austria say that in certain circumstances, climate conditions can lead to conflict, which drives increased migration. Henry Ridgwell reports.
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The mass migration flows that followed the Arab Spring in North Africa and the Middle East were partly caused by climate change, according to new research. Scientists from the International Institute for Applied Systems Analysis in Austria say that in certain circumstances, climate conditions can lead to conflict, which drives increased migration. Henry Ridgwell reports.
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A Tuesday tweet from a U.S. government scientific agency seems relatively innocuous: “Winter storms do not prove global warming is not happening.”

The message from the National Oceanic and Atmospheric Administration (NOAA), which is devoted to climate science and information, includes a link citing research that severe snowstorms may be even more likely in a warming global climate because higher ocean temperatures appear to create more moisture.

Many are viewing Tuesday’s post as a rebuttal to President Trump’s tweet late Monday noting an approaching deep freeze for the American Midwest and asking “What the hell is going on with Global Waming (sic). Please come back fast, we need you.”

A polar vortex has returned this week to the Midwest bringing extremely low temperatures that could break records.

NOAA denies any connection between the president’s comment and its social media posting.

 

“We routinely put this story out at these times,” the agency said in a statement. “Our scientists weren’t responding to a tweet.”

Most scientists say there is little valid research to counter the prevailing view climate change is real and note research also demonstrates that with global warming there will be more frequently extreme temperatures at both ends of the thermometer.

 

With a forecast of icy roads around the nation’s capital, one item of unanimous consent throughout the Trump administration Tuesday is non-emergency federal workers – just two days back on the job after a record-long shutdown – could leave early because of the weather.

 

“Employees of Federal offices in the Washington, D.C., area are authorized for early departure,” according to a notice from the U.S. Office of Personnel Management. “Employees should depart 2 hours earlier than their normal departure times and may request unscheduled leave to depart prior to their staggered departure times.”

 

The notification is intended, in part, to alleviate congestion on streets that could soon become hazardous.

 

The ability of a mere dusting of snow or sheets of ice on roadways and sidewalks to create pandemonium in the U.S. center of power frequently puzzles those who have migrated to this part of the country from harsher winter climates.

 

A January 2016 snowstorm paralyzed the region, although only 2.5 centimeters of snow fell on Washington, D.C. roadways. There were hundreds of traffic accidents and many motorists abandoned their vehicles on highways after untreated roads became impassible with black ice.

 

The mess and lack of preparedness prompted a public apology by the mayor of Washington, D.C.

Muriel Bowser was taking no such chances on Tuesday, three years after the so-called Snowzilla (not to be confused with the area’s December 2009 Snowpocalypse).

 

Mayor Bowser, on Tuesday announced she had requested an additional $1 million from the city’s contingency fund “to cover higher costs than anticipated for salt/de-icing as a result of Winter Storm Gia.”

The city also issued a hypothermia alert, which will keep shelters open during daylight hours so the estimated 7,000 homeless people in Washington will have a warm and safe place to stay.

 

A member of Congress from Utah, as government employees began packing up early in the afternoon, on Tuesday threw his own virtual snowball at the threat of another approaching winter storm appearing to panic politicians, bureaucrats and lobbyists inside the Beltway.

 

“People in DC love to show how tough they are and call their opponents ‘snowflake,’” wrote Congressman Ben McAdams on Twitter. “Unless the weather forecast includes snowflakes, and then they cancel meetings, leave work early and buy all of the bottled water at the grocery store. Snowflakes.” He then tossed a promotional hashtag for a top winter recreational activity in his state that includes the Wasatch Mountain range: #SkiUtah.
…

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A Tuesday tweet from a U.S. government scientific agency seems relatively innocuous: “Winter storms do not prove global warming is not happening.”

The message from the National Oceanic and Atmospheric Administration (NOAA), which is devoted to climate science and information, includes a link citing research that severe snowstorms may be even more likely in a warming global climate because higher ocean temperatures appear to create more moisture.

Many are viewing Tuesday’s post as a rebuttal to President Trump’s tweet late Monday noting an approaching deep freeze for the American Midwest and asking “What the hell is going on with Global Waming (sic). Please come back fast, we need you.”

A polar vortex has returned this week to the Midwest bringing extremely low temperatures that could break records.

NOAA denies any connection between the president’s comment and its social media posting.

 

“We routinely put this story out at these times,” the agency said in a statement. “Our scientists weren’t responding to a tweet.”

Most scientists say there is little valid research to counter the prevailing view climate change is real and note research also demonstrates that with global warming there will be more frequently extreme temperatures at both ends of the thermometer.

 

With a forecast of icy roads around the nation’s capital, one item of unanimous consent throughout the Trump administration Tuesday is non-emergency federal workers – just two days back on the job after a record-long shutdown – could leave early because of the weather.

 

“Employees of Federal offices in the Washington, D.C., area are authorized for early departure,” according to a notice from the U.S. Office of Personnel Management. “Employees should depart 2 hours earlier than their normal departure times and may request unscheduled leave to depart prior to their staggered departure times.”

 

The notification is intended, in part, to alleviate congestion on streets that could soon become hazardous.

 

The ability of a mere dusting of snow or sheets of ice on roadways and sidewalks to create pandemonium in the U.S. center of power frequently puzzles those who have migrated to this part of the country from harsher winter climates.

 

A January 2016 snowstorm paralyzed the region, although only 2.5 centimeters of snow fell on Washington, D.C. roadways. There were hundreds of traffic accidents and many motorists abandoned their vehicles on highways after untreated roads became impassible with black ice.

 

The mess and lack of preparedness prompted a public apology by the mayor of Washington, D.C.

Muriel Bowser was taking no such chances on Tuesday, three years after the so-called Snowzilla (not to be confused with the area’s December 2009 Snowpocalypse).

 

Mayor Bowser, on Tuesday announced she had requested an additional $1 million from the city’s contingency fund “to cover higher costs than anticipated for salt/de-icing as a result of Winter Storm Gia.”

The city also issued a hypothermia alert, which will keep shelters open during daylight hours so the estimated 7,000 homeless people in Washington will have a warm and safe place to stay.

 

A member of Congress from Utah, as government employees began packing up early in the afternoon, on Tuesday threw his own virtual snowball at the threat of another approaching winter storm appearing to panic politicians, bureaucrats and lobbyists inside the Beltway.

 

“People in DC love to show how tough they are and call their opponents ‘snowflake,’” wrote Congressman Ben McAdams on Twitter. “Unless the weather forecast includes snowflakes, and then they cancel meetings, leave work early and buy all of the bottled water at the grocery store. Snowflakes.” He then tossed a promotional hashtag for a top winter recreational activity in his state that includes the Wasatch Mountain range: #SkiUtah.
…

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South Africa’s coal mining heartland has the worst air quality in the world, according to a recent study by environmental group Greenpeace. The 12 large coal mines in this area make it the world’s hotspot for toxic nitrogen dioxide emissions. Residents and health experts say the effects are ruining their health and their lives.

Patrick Mdluli, 35,  considered himself healthy until he moved two years ago to Mpumalanga province – South Africa’s coal mining heartland.

He developed breathing problems, including tuberculosis and nasal issues.

“The mines, the dust, pollution — you go to doctors, they tell you the very same thing. ‘Are you living next to a mine?’ Yes, I am. ‘Are you living next to a dumping site?’ Yes, I am,” said Mdluli.

A large coal mine operates, literally, in Mdluli’s backyard.

The mine has conducted blasts every day, shaking his small home to its foundation and causing a large crack in the wall. 

 

This sunny swath of South Africa last year earned the unfortunate distinction of having the world’s worst air quality, says the environmental group Greenpeace.

 

And it shows, said the head of one of Middelburg’s main clinics, Dr. Mohammed Tayob.  

 

Tayob has lived in the area his entire life and says the emissions from the mines have made many of his patients sick.  

 

“Children and adults are paying the ultimate price. When we say ultimate price, it’s the neurocognitive, loss of neurocognitive development, children’s infant mortality rate is higher in our area than other areas, adults, heart attacks and respiratory diseases are much higher. So people are paying with their lives, across the board, because of these pollutants in the air,” he said.

 

Tayob blames the coal mining industry and poor governance. 

 

Although mines are big money, locals say the coal companies have done little to improve the community.  

 

Middelburg is poor and many people lack basic services like electricity and running water. 

 

Tayob said the government is also failing to enforce environmental laws and crack down on the mines.  

 

“One cannot be faulted in thinking, ‘Is there some level of corruption operating in this area as well, where these big boys are getting away with murder, literally?’ They’re literally getting away with murder. It’s just the reality. I’d like someone to come up and dispute this fact and challenge me on that,” he said.

 

VOA contacted three of the larger mines in the area for comment. None of them responded to our request.

 

Environmental activist Bafana Hlatshwayo said he and other activists are preparing to lobby decision-makers at an upcoming mining industry gathering in Cape Town. 

 

They want the coal industry to shift to a cleaner resource: the region’s abundant sunshine.  

 

Bringing solar panel production to the area, said Hlatshwayo, would also create jobs.

 

“We are not saying we want to close down the mines…We must go the renewable energy way, we are saying, people will manufacture solar panels inside South Africa, and they are the ones who are supposed to install the solar panels and they are the ones who are supposed to maintain the solar panels,” he said.  

 

But that is a faraway dream for people like Mdluli and his neighbors, who complain unemployment is high and all of them – including the children – have health problems.

 

This province, said longtime resident and environmental activist William Jiyane, used to be beautiful.

 

“It’s endless agony, now, Mpumalanga. It’s not bread and butter anymore. It’s endless agony,” he said.

 

South Africa is the continent’s largest coal producer and relies on coal to power much of the economy.  

 

But for the poor communities that live in the shadow of coal mines – it just makes them sick.
…

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South Africa’s coal mining heartland has the worst air quality in the world, according to a recent study by environmental group Greenpeace. The 12 large coal mines in this area make it the world’s hotspot for toxic nitrogen dioxide emissions. Residents and health experts say the effects are ruining their health and their lives.

Patrick Mdluli, 35,  considered himself healthy until he moved two years ago to Mpumalanga province – South Africa’s coal mining heartland.

He developed breathing problems, including tuberculosis and nasal issues.

“The mines, the dust, pollution — you go to doctors, they tell you the very same thing. ‘Are you living next to a mine?’ Yes, I am. ‘Are you living next to a dumping site?’ Yes, I am,” said Mdluli.

A large coal mine operates, literally, in Mdluli’s backyard.

The mine has conducted blasts every day, shaking his small home to its foundation and causing a large crack in the wall. 

 

This sunny swath of South Africa last year earned the unfortunate distinction of having the world’s worst air quality, says the environmental group Greenpeace.

 

And it shows, said the head of one of Middelburg’s main clinics, Dr. Mohammed Tayob.  

 

Tayob has lived in the area his entire life and says the emissions from the mines have made many of his patients sick.  

 

“Children and adults are paying the ultimate price. When we say ultimate price, it’s the neurocognitive, loss of neurocognitive development, children’s infant mortality rate is higher in our area than other areas, adults, heart attacks and respiratory diseases are much higher. So people are paying with their lives, across the board, because of these pollutants in the air,” he said.

 

Tayob blames the coal mining industry and poor governance. 

 

Although mines are big money, locals say the coal companies have done little to improve the community.  

 

Middelburg is poor and many people lack basic services like electricity and running water. 

 

Tayob said the government is also failing to enforce environmental laws and crack down on the mines.  

 

“One cannot be faulted in thinking, ‘Is there some level of corruption operating in this area as well, where these big boys are getting away with murder, literally?’ They’re literally getting away with murder. It’s just the reality. I’d like someone to come up and dispute this fact and challenge me on that,” he said.

 

VOA contacted three of the larger mines in the area for comment. None of them responded to our request.

 

Environmental activist Bafana Hlatshwayo said he and other activists are preparing to lobby decision-makers at an upcoming mining industry gathering in Cape Town. 

 

They want the coal industry to shift to a cleaner resource: the region’s abundant sunshine.  

 

Bringing solar panel production to the area, said Hlatshwayo, would also create jobs.

 

“We are not saying we want to close down the mines…We must go the renewable energy way, we are saying, people will manufacture solar panels inside South Africa, and they are the ones who are supposed to install the solar panels and they are the ones who are supposed to maintain the solar panels,” he said.  

 

But that is a faraway dream for people like Mdluli and his neighbors, who complain unemployment is high and all of them – including the children – have health problems.

 

This province, said longtime resident and environmental activist William Jiyane, used to be beautiful.

 

“It’s endless agony, now, Mpumalanga. It’s not bread and butter anymore. It’s endless agony,” he said.

 

South Africa is the continent’s largest coal producer and relies on coal to power much of the economy.  

 

But for the poor communities that live in the shadow of coal mines – it just makes them sick.
…

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The U.N. Children’s Fund is launching its largest-ever appeal for $3.9 billion in life-saving assistance for 73 million people, including 41 million children affected by conflict, natural disasters and other emergencies in 59 countries. 

This year marks the 30th anniversary of the Convention on the Rights of the Child.  The U.N. Children’s Fund says 2019 also marks a year of heightened conflict, with more countries at war than at any time in the past three decades.

Among the greatest victims are more than 34 million children affected by conflict or disaster.  UNICEF says they are suffering horrific levels of violence, deprivation and trauma with little access to protection and life-saving assistance.

UNICEF Director of Emergency Operations Manuel Fontaine says 88 percent of this year’s appeal is for humanitarian crises driven by conflict.  He says the single biggest operation is to help Syrian refugees, the largest displacement crisis in the world, and the host communities in five neighboring countries of asylum.

“The 2nd largest appeal is for Yemen, which over the past year has seen conditions, unfortunately, that were already catastrophic for children get even worse, if that is possible” Fontaine said. “Eight out of 10 children, which is over 11 million, now require humanitarian assistance in Yemen.” 

UNICEF’s biggest operations traditionally have been in Africa.  But this year the Democratic Republic of Congo places third, followed by Syria and South Sudan.

Fontaine says Africa unfortunately is the continent with the biggest gap in funding.  He tells VOA African countries are not getting the attention they need, and that has serious consequences for humanitarian operations.

“In a country like Cameroon, which is one of the countries for which we have concerns, particularly in northwest and southwest region at the moment.  We had aimed to immunize 61,000 children against measles and because of lack of resources, we could only immunize a bit more than 2,000,” Fontaine said. “So, obviously, we are far behind what we need to do.” 

Fontaine says UNICEF has had to drastically cut back services for gender-based violence in Central African Republic because it only has received 36 percent of the money it needs.  In all cases, he says funding shortfalls have very direct implications on the lives of children and women.
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The U.N. Children’s Fund is launching its largest-ever appeal for $3.9 billion in life-saving assistance for 73 million people, including 41 million children affected by conflict, natural disasters and other emergencies in 59 countries. 

This year marks the 30th anniversary of the Convention on the Rights of the Child.  The U.N. Children’s Fund says 2019 also marks a year of heightened conflict, with more countries at war than at any time in the past three decades.

Among the greatest victims are more than 34 million children affected by conflict or disaster.  UNICEF says they are suffering horrific levels of violence, deprivation and trauma with little access to protection and life-saving assistance.

UNICEF Director of Emergency Operations Manuel Fontaine says 88 percent of this year’s appeal is for humanitarian crises driven by conflict.  He says the single biggest operation is to help Syrian refugees, the largest displacement crisis in the world, and the host communities in five neighboring countries of asylum.

“The 2nd largest appeal is for Yemen, which over the past year has seen conditions, unfortunately, that were already catastrophic for children get even worse, if that is possible” Fontaine said. “Eight out of 10 children, which is over 11 million, now require humanitarian assistance in Yemen.” 

UNICEF’s biggest operations traditionally have been in Africa.  But this year the Democratic Republic of Congo places third, followed by Syria and South Sudan.

Fontaine says Africa unfortunately is the continent with the biggest gap in funding.  He tells VOA African countries are not getting the attention they need, and that has serious consequences for humanitarian operations.

“In a country like Cameroon, which is one of the countries for which we have concerns, particularly in northwest and southwest region at the moment.  We had aimed to immunize 61,000 children against measles and because of lack of resources, we could only immunize a bit more than 2,000,” Fontaine said. “So, obviously, we are far behind what we need to do.” 

Fontaine says UNICEF has had to drastically cut back services for gender-based violence in Central African Republic because it only has received 36 percent of the money it needs.  In all cases, he says funding shortfalls have very direct implications on the lives of children and women.
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As rescuers in Brazil search for survivors of a dam collapse, questions abound about the health and environmental risks of the thick, brown, metal-laden mine waste that flowed over buildings. The accident comes after the United Nations and others warned that dam failures in the mining industry are becoming increasingly catastrophic because the structures are growing larger and more numerous around the globe.

A look at some of the hazards:

 

What Are Mine Tailings and How Are They Stored?

 

Mine tailings are large volumes of waste rock and other material left behind after companies dig up mineral-bearing ore and run it through mechanical and chemical processes to remove the most valuable components. The tailings are disposed of in ponds or other “impoundments,” often in a mud-like mixture of water and rock known as slurry.

 

A single large mine can produce hundreds of thousands of tons of tailings each day that are typically pumped into a massive holding area behind a dam, where the waste can remain for decades. Tailings piles can be dry enough on the surface to allow people to walk on them, but the inside is often wet, with a jelly-like consistency. A breach can release a runny, muddy material.

 

In Friday’s disaster in Brumadinho, Brazil, the dam that failed was 282 feet (86 meters) high and held more than 400 million cubic feet (11.7 million cubic meters) of waste material, according to its owner, Brazilian-mining company Vale.

 

Are the Tailings Toxic?

 

The composition of tailings varies from mine to mine, with some containing radioactive material, heavy metals and even cyanide, which is used in silver and gold extraction.

 

Vale representatives have insisted that the slow-moving mud spreading down the Paraopeba River following Friday’s collapse is composed mostly of silica, or sand, and is non-toxic. But environmental groups contend the iron ore mine waste contains high levels of iron oxide that could cause irreversible damage.

 

A similar disaster in 2015 at a Vale-operated mine in the same region of Brazil killed 19 people and released 78 million cubic feet (60 million cubic meters) of mud that polluted hundreds of miles of rivers and streams. In that case, a U.N. report found that the waste “contained high levels of toxic heavy metals.”

 

Beyond the chemical dangers, a huge rush of muddy water into a river system can have long-lasting environmental effects, plastering the riverbed with silt that kills fish and vegetation.

 

The 2015 accident in Samarco, Brazil, left 250,000 people without drinking water after downstream supply systems were tainted or otherwise disrupted by mud.

 

Another danger from a tailings dam breach is that the sudden release can overtop a river’s normal channel and deposit contaminants on normally dry land, said Ellen Wohl, a geology professor at Colorado State University.

 

Those contaminants can later wash back into the river, re-polluting the water, she said. The contaminants can also become airborne if floodwaters deposit them on the riverbank, where they can dry out and blow away, said Marco Kaltofen, who is also a nuclear and chemical engineering researcher at Worcester Polytechnic Institute.

 

How Often Do the Dams Fail and What Happens When They Do?

 

These types of dam failures are increasingly devastating because mines operate on a much larger scale than in the past, producing more tailings that require bigger dams.

 

There are an estimated 18,000 tailings dams worldwide, according to David Chambers with the Center for Science in Public Participation, which consults with government agencies and private groups on mining pollution issues.

 

A 2017 U.N report identified 40 significant dam failures over the prior decade — including in Canada, China, Brazil and Chile. A compilation of dam failures by Chambers and others tallied 435 people killed over the same time period.

 

“We can’t tell you where a failure is going to occur, but statistically we can tell you they are going to happen,” Chambers said.

 

What is Being Done to Prevent Tailings Dam Failures?

 

The dams can be threatened by earthquakes, undiscovered geologic faults and heavy rainstorms, and each of those threats has many unknowns, said Dermot Ross-Brown, a longtime mining consultant and a part-time professor at the Colorado School of Mines.

 

Mining companies use the best science and consultants they can find, he said. “It’s just that the problem is so big, and they have imperfect knowledge of what the geology is.”‘

 

Last year’s report from the U.N. recommended that governments and mining companies adopt a “zero-failure” goal for mining impoundments.

 

In 2016, in the wake of the Samarco spill, the International Council on Mining and Metals said instances of catastrophic mine waste impoundment failures were unacceptable. The organization issued new safety guidelines, and called on companies to use construction methods and operating practices that minimize the chances of accidents.

 

But the industry’s critics say such calls for reforms have yielded few changes and more dam failures are inevitable without stepped-up construction practices and inspection regimes. They say more also needs to be done to make sure that people are not living or working just downstream of the dams, where they are at the greatest risk in a failure.

 

“We have the technology and we have the expertise, and the mining industry frankly has fought making those changes,” said Payal Sampat with the U.S.-based environmental group Earthworks.
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