Kicking Up Controversy With Wild Horses in the West
By Kang-Chun Cheng
Modoc County lies in the far northeast corner of California, and most of its 10,000 residents rely on cattle herding, logging, or government jobs for employment. Rodeos and 4-H programs fill most families' calendars; massive belt buckles, blue jeans, and cowboy hats are common attire. Modoc's niche brand of American individualism stems from a free-spirited cowboy culture that imbues the local ranching conflict with wild horses.
To many, wild horses are icons of freedom and independence. While prevailing science says they are an invasive species that arrived with the Spanish conquistadors nearly a half-millennium ago, some say they are Indigenous to this continent. Regardless of their origins, more than 95,000 wild horses are roaming across public lands in the West. The population goal, based on available forage and water, is closer to 27,000. With no effective natural predators, unmanaged populations can double in four to five years (and triple in six to eight years).
These growing numbers have instigated and intensified ecological and social challenges in rural Western communities: Wild horses destroy fences, compete with cattle for grazing, alter native plant communities, affect wildlife behavior, and challenge watershed function.
They also cost the U.S. a lot of money. To manage wild horses, the Forest Service and the Bureau of Land Management have to cover both on-range populations and off-range holding costs. The estimated lifetime cost of keeping a wild horse in off-range pastures or holding facilities is $50,000 per animal. In 2019 alone, the bureau spent nearly $50 million caring for wild horses.
National wild horse advocates often love their equines from a distance; many are convinced that any sort of wild horse management is inhumane. But locals, including Native American populations, will tell you that they have struggled to coexist with the proliferation of horses for generations and that management is necessary. Ranchers insist that unchecked propagation of wild horses overruns the sagebrush landscape that their cattle graze on and share with various native and migratory animals and birds. At the same time, wild horse supporters push back against cattle ranchers' powerful economic interests.
Tensions over the management and allocation of resources in these regions run high. But solutions for assuaging these conflicts are already in play, including fertility control, roundups to adopt wild horses, and land acquisition. Long-term resolution will likely depend on a strategic combination of all three, along with a shared understanding among community members, public servants, and advocacy groups about what a healthy ecological balance looks like across the sagebrush landscape of the West.
The History of Horse Management
Before the 1950s, feral horses were largely unregulated in the U.S. They were released, grazed, captured, killed, sold, and otherwise managed by local inhabitants as they saw fit. Around that time, Velma Bronn Johnston, aka "Wild Horse Annie," started raising public awareness of the "perceived inhumane capture and treatment of free-ranging herds."
Thanks in part to Johnston's efforts, the Wild Free-Roaming Horses and Burros Act was signed into law by President Nixon in 1971. It declared that the animals "shall be protected from capture, branding, harassment, or death; and to accomplish this, they are to be considered in the area where presently found, as an integral part of the natural system of the public lands."
This act has been amended four times since its conception to accommodate the fluctuating opinions and conditions around maintaining a "thriving natural ecological balance on the public lands"—an admirable although highly subjective goal. Achieving it involves juggling competing interests: those of local residents, permanent grazers, hunters and fishers, advocacy groups, conservationists, and Indigenous tribes.
The Bureau of Land Management must manage these many conflicting interests. Modoc County's Devil's Garden Plateau Wild Horse Territory epitomizes the challenges of this task. Officially deemed wild horse territory, the garden consists of 258,000 acres and is wholly within permitted livestock allotments. It is also home to wildlife such as cougar, antelope, migratory birds, and aquatic species dependent on delicate high-desert riparian areas.
The presence of wild horses has been shown to decrease native wildlife species diversity for both birds and mammals. Pronghorn antelope are an icon in Western grasslands, known for their annual 350-mile migration along historic routes estimated to be 5,800 years old. This awe-inspiring trek is one of the longest large-mammal migration corridors remaining in North America, but 75% of pronghorn migration routes have already been lost because of disturbances from the accelerated leasing of public lands and energy development. Horses also affect the pronghorn's yearly migrations by monopolizing watering holes, thus preventing native species from drinking.
Indigenous Support for Ecological Balance
Ken Sandusky, a public information officer who has worked for the Forest Service in Modoc County for 13 years, lives by his station's mission statement: "Caring for the Land and Serving People." In his work, Sandusky aims to include the broad range of stakeholders and often acts as a tribal liaison. Sandusky himself is a member of the Choctaw tribe of Oklahoma, but as a Modoc native, is more culturally in touch with the local Klamath tribe.
When it comes to rangeland health, he says, there's a tangible split in what that actually means. "It depends on what you are measuring the outcome against," Sandusky explains. Range managers may perceive progress from a year-to-year basis, but to many Indigenous tribes, the baseline for "progress" goes back generations, to pre-contact times. "They have long memories," he says. "Tribes see damage that is a hundred-plus years in the making."
While individual perspectives on wild horses may vary among cattle ranchers, as a whole, herders are in favor of stricter wild-horse management to lessen grazing competition for their livestock. Indigenous tribes in Modoc, too, are largely supportive of wild horse management. But they also challenge the sustainability of current cattle grazing management. Local tribes collect wild onions, wild roses, grasses for basketry, and wood for bows and arrows—materials that are incontrovertibly affected by unmanaged grazing, regardless of the species.
Still, Sandusky, along with other public servants at the Forest Service and the Bureau of Land Management, express concern about the dogma of wild horse advocates. "They tend to forget or intentionally ignore how they don't hold a monopoly over public opinion," he said. "Stakeholders can get myopic and good at keyhole storytelling."
A Willingness to Try New Things
"Americans don't know what's happening on these lands," says Suzanne Roy, the executive director of the American Wild Horse Campaign, an advocacy organization. The Bureau of Land Management, she says, "is run by and for the livestock industry. They come from a ranching background. The term 'rangeland' management itself illustrates how livestock management is the dominant perspective."
Roy is particularly concerned about how resources are being allocated: "Policies of land management agencies don't reflect the desires and interests of the public." To illustrate, most Americans associate public lands with national parks and environmental conservation; only 29% of respondents to a recent poll considered livestock grazing an acceptable use of those lands.
Grazing on public lands certainly aligns with the financial interests of cattle ranchers and helps explain why they insist on increased wild horse management. Cattle can graze on public lands for $1.35 per animal per month, while grazing on comparable private land costs ranchers $23 per animal per month (American taxpayer dollars make up the difference). To be fair, though, small-scale ranching would not be viable without public lands.
The campaign hopes to work toward more equitable resource allocation and improvements to overall habitats for horses and wildlife generally. "There are workable solutions to this issue," Roy says. "Common pushback from rangers is that new conservation strategies will 'destroy our way of life,' but change doesn't have to be bad."
The social conservatism intrinsic to human cultures makes change seem daunting and people reluctant to try new tactics even in the face of suboptimal systems. Roy uses a case in adjacent Marin County to illustrate: Until 2001, the county ran a USDA program focused on killing apex predators (e.g. coyotes, mountain lions, and cougars) in defense of livestock. Unfortunately, this strategy fails to take into account the science of predators. Killing one mountain lion, for example, creates a vacuum and will eventually lead to increased competition for this newly available territory. In 2001, Marin introduced a country-run program that promoted nonlethal methods such as fox lights, guard dogs, and fladry to deal with predator incidents while compensating ranchers for sheep and lambs lost to predation.
Ranchers were initially livid, concerned that bans on shooting and trapping hindered their rights, making them defenseless against livestock predation. But 15 years later, a majority agreed that this form of humane adaptive management has successfully reduced both livestock losses and the total number of predators. Ensuring its continued success, the program requires active participation on behalf of all stakeholders and long-term commitment from the local government for support.
As one fifth-generation sheepherder, Gowan Batiste, explained in an interview to the Ukiah Daily Journal, "Livestock is a food of desperation for predators; the more you harass them and make life difficult for them, the more likely they are going to come into conflict with humans."
Keeping Wild Horses in Check
When it comes to wild horses, many solutions are already in the works. Through annual autumn wild horse roundups, known as gathers, the Double Devil Wild Horse Corrals has become one of the U.S.'s most successful adoption sites. The California Cattlemen's Association, a nonprofit trade association and organization popular among ranchers in Modoc, urges its members to support the wild horse gathers in Devils Garden, saying they are humane, good for the horses themselves (since competition for scarce water and forage resources may instigate aggression and herd violence), and necessary to support local ranchers and Modoc's agriculture-reliant economy.
Another popular solution for controlling wild horse populations is a fertility-control vaccine called PZP, given to female horses on the range using dart guns. Mares are tracked on foot or with game cameras while drones are used to locate more elusive herds. The PZP vaccine has been endorsed by the American Wild Horse Campaign as the "most promising strategy" for managing wild horses in their habitats and is also recommended by the National Academy of Sciences. Importantly, a dose of the vaccine only costs $30.
Lastly, land acquisition and grazing lease buyouts can promote equitable sharing of public lands and available forage. Acquiring key pieces of land adjacent to or within federally designated wild horse habitat areas can reduce conflicts over resource allocation.
A Global Search for Solutions
Pastoralists all over the world face similar land-use conflicts, despite huge variations in climate and culture. The ongoing situation across rural California resonates with that of Fulani cattle herders in Niger and Sami reindeer herders in the Arctic.
Herders everywhere are accused of having too many animals or are perceived as selfish and irresponsible by their own communities. Overgrazing is certainly an issue, but it's not simply the number of animals that matters: The amount of time animals spend in a certain area is critical to rangeland health. And in the context of such allegations, the ecological value of grazing is frequently omitted. Grazers, both wild and domestic, are key to regulating soil health and allowing for species diversity and coverage, as well as efficient carbon sequestration.
Part of the problem in these heated grazing debates is that moderate viewpoints are drowned out by extremist agendas—those who prioritize wild horse populations at all costs and those who want all of the horses gone, period. "The majority of people don't really have strong views about the horses," Sandusky says. "But the ones who do can get really into it." These unwavering views make it difficult to find compromises that account for all stakeholders.
"There is no biological problem, merely a social one," says professor Nicholas Tyler, a pastoralism expert at the University of Tromsø in northern Norway. Tyler maintains that in the case of horses and cattle in the West, as with so many others, the so-called equilibria argument is specious and quasi-biological. "Certainly a lot of horses will influence the species composition," he says. "Remove the horses, things change. Add horses, things change again. There is nothing magical about that."
But Tyler takes it one step further: "There never was, is, or will be a balance. There are shifting equilibria, which is something quite different," he says. "It is up to the community to decide which state of that equilibrium it prefers."
Regardless of one's views on what the ideal or preferred proportion of horses, cattle, and wildlife should be, holistic strategies could lead to increased cooperation and knowledge exchange as part of mitigating the current tension. One study examining the mutual dependence of extensive land-use and conservation management in Eastern Europe makes the case for a new profession: the "conservation herder."
This idea combines age-old traditional herding knowledge with a newfound awareness of herders' role in providing ecosystem services. Conservation herding could support pastoralists through the continued sale of their meat and milk production as well as government subsidies for biodiversity management.
Refreshing pasture management techniques and adapting traditional herding strategies to current rangeland vegetation conditions will provide the necessary backdrop for such solutions to take. Perhaps most importantly, reconciliation of a livelihood that has been traditionally judged as anterior to conservation causes may be exactly what a place such as Modoc needs to move forward. As a society, we tend to not address issues if there are no easy answers or if they cannot be solved by the next news or election cycle. Sandusky says: "Some of us don't have that choice."
Kang-Chun Cheng is a freelance environmental photojournalist based in Nairobi, Kenya. Her background in ecology, with a focus on community-based natural resource management and traditional knowledge, informs and enhances her perspectives as a photojournalist. She is fascinated by the shifting dynamics and values between society, culture, and nature, and use photography as a tool for storytelling. She has been documenting the impact of technology and climate change on traditional reindeer herding culture in Norway and Finland since 2017. She loves rock-climbing, cooking, and knitting. Her work has previously been published in Earth Island Journal, the Valley News, Northern Woodlands, China Africa Project, and others.
Reposted with permission from YES! Magazine.
- Horses Might Stop the Permafrost From Melting - EcoWatch ›
- Feds Begin Selling Wild Horses Captured in California for $1 Each ... ›
By Frank La Sorte and Kyle Horton
Millions of birds travel between their breeding and wintering grounds during spring and autumn migration, creating one of the greatest spectacles of the natural world. These journeys often span incredible distances. For example, the Blackpoll warbler, which weighs less than half an ounce, may travel up to 1,500 miles between its nesting grounds in Canada and its wintering grounds in the Caribbean and South America.
Blackpoll warbler. PJTurgeon / Wikipedia<p>We used this information to determine how the number of migratory bird species varies based on each city's level of <a href="https://www.britannica.com/science/light-pollution" target="_blank" rel="noopener noreferrer">light pollution</a> – brightening of the night sky caused by artificial light sources, such as buildings and streetlights. We also explored how species numbers vary based on the quantity of tree canopy cover and impervious surface, such as concrete and asphalt, within each city. Our findings show that cities can help migrating birds by planting more trees and reducing light pollution, especially during spring and autumn migration.</p>
Declining Bird Populations<p>Urban areas contain numerous dangers for migratory birds. The biggest threat is the risk of <a href="https://doi.org/10.1650/CONDOR-13-090.1" target="_blank">colliding with buildings or communication towers</a>. Many migratory bird populations have <a href="http://dx.doi.org/10.1126/science.aaw1313" target="_blank">declined over the past 50 years</a>, and it is possible that light pollution from cities is contributing to these losses.</p><p>Scientists widely agree that light pollution can <a href="https://doi.org/10.1073/pnas.1708574114" target="_blank">severely disorient migratory birds</a> and make it hard for them to navigate. Studies have shown that birds will cluster around brightly lit structures, much like insects flying around a porch light at night. Cities are the <a href="https://doi.org/10.1002/fee.2029" target="_blank" rel="noopener noreferrer">primary source of light pollution for migratory birds</a>, and these species tend to be more abundant within cities <a href="https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.13792" target="_blank" rel="noopener noreferrer">during migration</a>, especially in <a href="https://doi.org/10.1016/j.landurbplan.2020.103892" target="_blank" rel="noopener noreferrer">city parks</a>.</p>
Composite image of the continental U.S. at night from satellite photos. NASA Earth Observatory images by Joshua Stevens, using Suomi NPP VIIRS data from Miguel Román, NASA's Goddard Space Flight Center
The Power of Citizen Science<p>It's not easy to observe and document bird migration, especially for species that migrate at night. The main challenge is that many of these species are very small, which limits scientists' ability to use electronic tracking devices.</p><p>With the growth of the internet and other information technologies, new data resources are becoming available that are making it possible to overcome some of these challenges. <a href="https://doi.org/10.1038/d41586-018-07106-5" target="_blank">Citizen science initiatives</a> in which volunteers use online portals to enter their observations of the natural world have become an important resource for researchers.</p><p>One such initiative, <a href="https://ebird.org/home" target="_blank" rel="noopener noreferrer">eBird</a>, allows bird-watchers around the globe to share their observations from any location and time. This has produced one of the <a href="https://doi.org/10.1111/ecog.04632" target="_blank" rel="noopener noreferrer">largest ecological citizen-science databases in the world</a>. To date, eBird contains over 922 million bird observations compiled by over 617,000 participants.</p>
Light Pollution Both Attracts and Repels Migratory Birds<p>Migratory bird species have evolved to use certain migration routes and types of habitat, such as forests, grasslands or marshes. While humans may enjoy seeing migratory birds appear in urban areas, it's generally not good for bird populations. In addition to the many hazards that exist in urban areas, cities typically lack the food resources and cover that birds need during migration or when raising their young. As scientists, we're concerned when we see evidence that migratory birds are being drawn away from their traditional migration routes and natural habitats.</p><p>Through our analysis of eBird data, we found that cities contained the greatest numbers of migratory bird species during spring and autumn migration. Higher levels of light pollution were associated with more species during migration – evidence that light pollution attracts migratory birds to cities across the U.S. This is cause for concern, as it shows that the influence of light pollution on migratory behavior is strong enough to increase the number of species that would normally be found in urban areas.</p><p>In contrast, we found that higher levels of light pollution were associated with fewer migratory bird species during the summer and winter. This is likely due to the scarcity of suitable habitat in cities, such as large forest patches, in combination with the adverse affects of light pollution on bird behavior and health. In addition, during these seasons, migratory birds are active only during the day and their populations are largely stationary, creating few opportunities for light pollution to attract them to urban areas.</p>
Trees and Pavement<p>We found that tree canopy cover was associated with more migratory bird species during spring migration and the summer. Trees provide important habitat for migratory birds during migration and the breeding season, so the presence of trees can have a strong effect on the number of migratory bird species that occur in cities.</p><p>Finally, we found that higher levels of impervious surface were associated with more migratory bird species during the winter. This result is somewhat surprising. It could be a product of the <a href="https://www.epa.gov/heatislands" target="_blank">urban heat island effect</a> – the fact that structures and paved surfaces in cities absorb and reemit more of the sun's heat than natural surfaces. Replacing vegetation with buildings, roads and parking lots can therefore make cities significantly warmer than surrounding lands. This effect could reduce cold stress on birds and increase food resources, such as insect populations, during the winter.</p><p>Our research adds to our understanding of how conditions in cities can both help and hurt migratory bird populations. We hope that our findings will inform urban planning initiatives and strategies to reduce the harmful effects of cities on migratory birds through such measures as <a href="https://www.arborday.org/programs/treecityusa/index.cfm" target="_blank" rel="noopener noreferrer">planting more trees</a> and initiating <a href="https://aeroecolab.com/uslights" target="_blank" rel="noopener noreferrer">lights-out programs</a>. Efforts to make it easier for migratory birds to complete their incredible journeys will help maintain their populations into the future.</p><p><em><span style="background-color: initial;"><a href="https://theconversation.com/profiles/frank-la-sorte-1191494" target="_blank">Frank La Sorte</a> is a r</span>esearch associate at the </em><em>Cornell Lab of Ornithology, Cornell University. <a href="https://theconversation.com/profiles/kyle-horton-1191498" target="_blank">Kyle Horton</a> is an assistant professor of Fish, Wildlife, and Conservation Biology at the Colorado State University.</em></p><p><em></em><em>Disclosure statement: Frank La Sorte receives funding from The Wolf Creek Charitable Foundation and the National Science Foundation (DBI-1939187). K</em><em>yle Horton does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.</em></p><p><em>Reposted with permission from <a href="https://theconversation.com/cities-can-help-migrating-birds-on-their-way-by-planting-more-trees-and-turning-lights-off-at-night-152573" target="_blank">The Conversation</a>. </em></p>
EcoWatch Daily Newsletter
By Lynne Peeples
Editor's note: This story is part of a nine-month investigation of drinking water contamination across the U.S. The series is supported by funding from the Park Foundation and Water Foundation. Read the launch story, "Thirsting for Solutions," here.
In late September 2020, officials in Wrangell, Alaska, warned residents who were elderly, pregnant or had health problems to avoid drinking the city's tap water — unless they could filter it on their own.
Unintended Consequences<p>Chemists first discovered disinfection by-products in treated drinking water in the 1970s. The trihalomethanes they found, they determined, had resulted from the reaction of chlorine with natural organic matter. Since then, scientists have identified more than 700 additional disinfection by-products. "And those only represent a portion. We still don't know half of them," says Richardson, whose lab has identified hundreds of disinfection by-products. </p>
What’s Regulated and What’s Not?<p>The U.S. Environmental Protection Agency (EPA) currently regulates 11 disinfection by-products — including a handful of trihalomethanes (THM) and haloacetic acids (HAA). While these represent only a small fraction of all disinfection by-products, EPA aims to use their presence to indicate the presence of other disinfection by-products. "The general idea is if you control THMs and HAAs, you implicitly or by default control everything else as well," says Korshin.</p><p>EPA also requires drinking water facilities to use techniques to reduce the concentration of organic materials before applying disinfectants, and regulates the quantity of disinfectants that systems use. These rules ultimately can help control levels of disinfection by-products in drinking water.</p>
Click the image for an interactive version of this chart on the Environmental Working Group website.<p>Still, some scientists and advocates argue that current regulations do not go far enough to protect the public. Many question whether the government is regulating the right disinfection by-products, and if water systems are doing enough to reduce disinfection by-products. EPA is now seeking public input as it considers potential revisions to regulations, including the possibility of regulating additional by-products. The agency held a <a href="https://www.epa.gov/dwsixyearreview/potential-revisions-microbial-and-disinfection-byproducts-rules" target="_blank">two-day public meeting</a> in October 2020 and plans to hold additional public meetings throughout 2021.</p><p>When EPA set regulations on disinfection by-products between the 1970s and early 2000s, the agency, as well as the scientific community, was primarily focused on by-products of reactions between organics and chlorine — historically the most common drinking water disinfectant. But the science has become increasingly clear that these chlorinated chemicals represent a fraction of the by-product problem.</p><p>For example, bromide or iodide can get caught up in the reaction, too. This is common where seawater penetrates a drinking water source. By itself, bromide is innocuous, says Korshin. "But it is extremely [reactive] with organics," he says. "As bromide levels increase with normal treatment, then concentrations of brominated disinfection by-products will increase quite rapidly."</p><p><a href="https://pubmed.ncbi.nlm.nih.gov/15487777/" target="_blank">Emerging</a> <a href="https://pubs.acs.org/doi/10.1021/acs.est.7b05440" target="_blank" rel="noopener noreferrer">data</a> indicate that brominated and iodinated by-products are potentially more harmful than the regulated by-products.</p><p>Almost half of the U.S. population lives within 50 miles of either the Atlantic or Pacific coasts, where saltwater intrusion can be a problem for drinking water supplies. "In the U.S., the rule of thumb is the closer to the sea, the more bromide you have," says Korshin, noting there are also places where bromide naturally leaches out from the soil. Still, some coastal areas tend to be spared. For example, the city of Seattle's water comes from the mountains, never making contact with seawater and tending to pick up minimal organic matter.</p><p>Hazardous disinfection by-products can also be an issue with desalination for drinking water. "As <a href="https://ensia.com/features/can-saltwater-quench-our-growing-thirst/" target="_blank" rel="noopener noreferrer">desalination</a> practices become more economical, then the issue of controlling bromide becomes quite important," adds Korshin.</p>
Other Hot Spots<p>Coastal areas represent just one type of hot spot for disinfection by-products. Agricultural regions tend to send organic matter — such as fertilizer and animal waste — into waterways. Areas with warmer climates generally have higher levels of natural organic matter. And nearly any urban area can be prone to stormwater runoff or combined sewer overflows, which can contain rainwater as well as untreated human waste, industrial wastewater, hazardous materials and organic debris. These events are especially common along the East Coast, notes Sydney Evans, a science analyst with the nonprofit Environmental Working Group (EWG, a collaborator on <a href="https://ensia.com/ensia-collections/troubled-waters/" target="_blank">this reporting project</a>).</p><p>The only drinking water sources that might be altogether free of disinfection by-products, suggests Richardson, are private wells that are not treated with disinfectants. She used to drink water from her own well. "It was always cold, coming from great depth through clay and granite," she says. "It was fabulous."</p><p>Today, Richardson gets her water from a city system that uses chloramine.</p>
Toxic Treadmill<p>Most community water systems in the U.S. use chlorine for disinfection in their treatment plant. Because disinfectants are needed to prevent bacteria growth as the water travels to the homes at the ends of the distribution lines, sometimes a second round of disinfection is also added in the pipes.</p><p>Here, systems usually opt for either chlorine or chloramine. "Chloramination is more long-lasting and does not form as many disinfection by-products through the system," says Steve Via, director of federal relations at the American Water Works Association. "Some studies show that chloramination may be more protective against organisms that inhabit biofilms such as Legionella."</p>
Alternative Approaches<p>When he moved to the U.S. from Germany, Prasse says he immediately noticed the bad taste of the water. "You can taste the chlorine here. That's not the case in Germany," he says.</p><p>In his home country, water systems use chlorine — if at all — at lower concentrations and at the very end of treatment. In the Netherlands, <a href="https://dwes.copernicus.org/articles/2/1/2009/dwes-2-1-2009.pdf" target="_blank">chlorine isn't used at all</a> as the risks are considered to outweigh the benefits, says Prasse. He notes the challenge in making a convincing connection between exposure to low concentrations of disinfection by-products and health effects, such as cancer, that can occur decades later. In contrast, exposure to a pathogen can make someone sick very quickly.</p><p>But many countries in Europe have not waited for proof and have taken a precautionary approach to reduce potential risk. The emphasis there is on alternative approaches for primary disinfection such as ozone or <a href="https://www.pbs.org/wgbh/nova/article/eco-friendly-way-disinfect-water-using-light/" target="_blank" rel="noopener noreferrer">ultraviolet light</a>. Reverse osmosis is among the "high-end" options, used to remove organic and inorganics from the water. While expensive, says Prasse, the method of forcing water through a semipermeable membrane is growing in popularity for systems that want to reuse wastewater for drinking water purposes.</p><p>Remucal notes that some treatment technologies may be good at removing a particular type of contaminant while being ineffective at removing another. "We need to think about the whole soup when we think about treatment," she says. What's more, Remucal explains, the mixture of contaminants may impact the body differently than any one chemical on its own. </p><p>Richardson's preferred treatment method is filtering the water with granulated activated carbon, followed by a low dose of chlorine.</p><p>Granulated activated carbon is essentially the same stuff that's in a household filter. (EWG recommends that consumers use a <a href="https://www.ewg.org/tapwater/reviewed-disinfection-byproducts.php#:~:text=EWG%20recommends%20using%20a%20home,as%20trihalomethanes%20and%20haloacetic%20acids." target="_blank" rel="noopener noreferrer">countertop carbon filter</a> to reduce levels of disinfection by-products.) While such a filter "would remove disinfection by-products after they're formed, in the plant they remove precursors before they form by-products," explains Richardson. She coauthored a <a href="https://pubs.acs.org/doi/10.1021/acs.est.9b00023" target="_blank" rel="noopener noreferrer">2019 paper</a> that concluded the treatment method is effective in reducing a wide range of regulated and unregulated disinfection by-products.</p><br>
Greater Cincinnati Water Works installed a granulated activated carbon system in 1992, and is still one of relatively few full-scale plants that uses the technology. Courtesy of Greater Cincinnati Water Works.<p>Despite the technology and its benefits being known for decades, relatively few full-scale plants use granulated active carbon. They often cite its high cost, Richardson says. "They say that, but the city of Cincinnati [Ohio] has not gone bankrupt using it," she says. "So, I'm not buying that argument anymore."</p><p>Greater Cincinnati Water Works installed a granulated activated carbon system in 1992. On a video call in December, Jeff Swertfeger, the superintendent of Greater Cincinnati Water Works, poured grains of what looks like black sand out of a glass tube and into his hand. It was actually crushed coal that has been baked in a furnace. Under a microscope, each grain looks like a sponge, said Swertfeger. When water passes over the carbon grains, he explained, open tunnels and pores provide extensive surface area to absorb contaminants.</p><p>While the granulated activated carbon initially was installed to address chemical spills and other industrial contamination concerns in the Ohio River, Cincinnati's main drinking water source, Swertfeger notes that the substance has turned out to "remove a lot of other stuff, too," including <a href="https://ensia.com/features/drinking-water-contamination-pfas-health/" target="_blank" rel="noopener noreferrer">PFAS</a> and disinfection by-product precursors.</p><p>"We use about one-third the amount of chlorine as we did before. It smells and tastes a lot better," he says. "The use of granulated activated carbon has resulted in lower disinfection by-products across the board."</p><p>Richardson is optimistic about being able to reduce risks from disinfection by-products in the future. "If we're smart, we can still kill those pathogens and lower our chemical disinfection by-product exposure at the same time," she says.</p><p><em>Reposted with permission from </em><em><a href="https://ensia.com/features/drinking-water-disinfection-byproducts-pathogens/" target="_blank">Ensia</a>. </em><a href="https://www.ecowatch.com/r/entryeditor/2649953730#/" target="_self"></a></p>
- Most Meat Will Be Plant-Based or Lab-Grown in 20 Years, Analysts ... ›
- Lab-Grown Meat Debate Overlooks Cows' Range of Use Worldwide ... ›
- Will Plant-Based Meat Become the New Fast Food? - EcoWatch ›
One city in New Zealand knows what its priorities are.
Dunedin, the second largest city on New Zealand's South Island, has closed a popular road to protect a mother sea lion and her pup, The Guardian reported.
piyaset / iStock / Getty Images Plus
- No Country Is Protecting Children's Health, Major Study Finds ... ›
- 'Every Child Born Today Will Be Profoundly Affected by Climate ... ›