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Fire for Watersheds

News Feed
Friday, April 26, 2024

Originally published by BioGraphic. Fire is not coming easily to the pile of dried grass and brush. Four college students fuss with the smoldering heap while Ron Goode, a bear-like man with a graying braid, leans on his cane and inspects their work. Crouch down low, he tells them. Reach farther into the brush with the lighter. Tentative orange flames spring to life and a student in a tie-dyed t-shirt blows gently, imploring them not to die. It’s a clear November day in the western foothills of California’s Sierra Nevada near the town of Mariposa. The students, visiting from the University of California, Berkeley, are here to help revitalize a patch of live oaks that belongs to Goode’s wife’s family. Goode, the chairman of the North Fork Mono Tribe, is here to teach them how. Now in his early 70s, Goode and his Tribe have worked for decades to restore neglected meadows and woodlands on private property,  reservations belonging to other Tribes, and on their own ancestral homelands in the Sierra National Forest. And restoration, in these dry hills, calls for fire. Dressed in cotton shirts and pants, the students feeding the thread of smoke in the oak grove look more like landscapers than a fire crew. “We’re not firefighters. We’re burners, professional burners,” Goode explains. “And we’re using Native knowledge, traditional ecological knowledge, from centuries ago.” This approach, employed by Native peoples across the world, is known as cultural burning. Once the fire is rolling, the students use pruning shears to cut more naked stems of Ta-ka-te, or sourberry (Rhus trilobata), down to the ground and toss those onto the now crackling pile. The next morning, after the flames have devoured this fuel, Goode’s grandnephew Jesse Valdez will coach the students on how to mix the cooling ash into the soil with rakes, to fertilize the roots below. After piles are burned and extinguished, fire practitioners will rake the ash into the soil to fertilize the roots below. Photograph by Ashley Braun Cultural burning is a kind of gardening. This Indigenous stewardship tradition of clearing, landscaping, and burning mimics natural disturbances, which create a diverse mosaic of habitats and trigger beneficial growth patterns in certain plants. Goode, Valdez, and other practitioners use small, targeted fires to help reshape and rejuvenate landscapes, both for the overall ecological health of the land and for specific cultural purposes, from cultivating traditional foods to sustaining ceremonial practices. Fire, for instance, stimulates Mo-nop’, or deergrass (Muhlenbergia rigens), to explode with flowers. Nium people, as the Mono call themselves, use these flexible flower stalks to weave watertight baskets coiled and patterned like rattlesnakes. And towering Wi-yap’, or black oak (Quercus kelloggii) yield bushels of healthy acorns — once a staple in many Native Californian diets. Low-intensity fires discourage competing conifers, smoke out pests, and clear fuels that threaten to carry flames into the oaks’ more vulnerable crowns. Fire also improves fruit production in berry patches — another key food source for people and animals. Acorns were once a staple among many California Natives, accounting for up to 50 percent of Indigenous diets in the state. Photograph by Ashley Braun Before foreign colonizers arrived and suppressed the practice, Native Californians often lit low-intensity fires to realize benefits like these. Frequent, low-intensity fire also inoculated the landscape against the kind of destructive megafires that regularly scorch the West Coast today. In fact, fire was so endemic in pre-colonial times that the total area burned in California each year was far greater than that burned by modern megafires. But instead of leaving a blackened moonscape largely devoid of life, the low-intensity fires revitalized the land. Now, Indigenous peoples across the United States are reclaiming traditional fire stewardship practices, from California and Oregon to Minnesota and Texas. They are reviving their connections to their cultures and homelands, restoring ecosystems, boosting biodiversity, and reducing wildfire risk. In California, they’re even using fire — counterintuitively — to bring water back to the parched land. “Let’s go way back in time,” Goode says, beginning a Nium story. “Tobahp — Land — married Pia — Water — and they had a mischievous child named Kos. And Kos is Fire. Kos liked to run around out in the forest and leave a trail, and wherever Kos went, his father Pia would follow him and sprinkle water on his trail, and his mother Tobahp would come along and plant flowers and plants.” The ancient allegory describes wildfire in the Sierra, Goode explains: After flames pass over the land, “Water is everywhere, and the first thing that starts popping up are all the cultural plants and the flowers.” Learning to harness fire and its benefits over millennia allowed Native Californians like the Nium to create and maintain open, park-like landscapes. They wanted clear sightlines to watch for danger and protect their villages and families. And the grassy oak savannas and meadows that they tended with cultural burning were ideal for gathering food, medicines, and other supplies, as well as for travel and hunting. Meadows are good for more than just people, says Joanna Clines, a Sierra National Forest botanist who has worked with the North Fork Mono on restoration. These wetland ecosystems are often-spring-fed and boast “a huge explosion of diversity,” Clines explains, including dozens of species of sedges, rushes, and grasses,  which in turn provide cover and forage for deer, birds, frogs, snakes, and other fauna. Wildflowers like common camas hide delicious bulbs beneath the damp soil and produce blooms that attract native butterflies and bees. Comprising just 2% of the region today — historically they may have covered more than four times that — meadows “are the gems of the Sierra Nevada,” Clines says. But from the late 18th to the early 20th century, colonists violently removed Indigenous stewards from their meadows, and from the land. Fires were snuffed out or never lit. Indigenous people in the Sierra and beyond were killed in droves, forced to assimilate, and corralled onto reservations. Spanish missionaries were first to ban cultural burning, followed later by the U.S. government. After a devastating complex of wildfires burned 3 million acres in the Northern Rockies in 1911, Congress passed a law establishing a national forest policy of fire prevention and suppression. The Bureau of Indian Affairs later adopted it on reservations. The land and people are still recovering from their forced separation from fire. Fifty miles east of Mariposa, Goode surveys a meadow within the North Fork Mono’s homelands, where fragrant native mint and soaproot toast in the autumn sun, alongside a muddy spring. The meadow is part of the 1.3-million-acre Sierra National Forest. For a long time, the Tribe tended deergrass and other resources here, Goode says, but in the early 1980s, many began to feel that the national forest no longer welcomed them in this place. Without the Tribe’s ministrations, ponderosa pines marched in, along with aggressive European invaders like Scotch broom, shading out what had been the largest deergrass bed in their homelands. In 2003, Dave Martin, a friendly new Forest Service district ranger, invited the North Fork Mono back to this meadow. When the Tribe returned, they found it unrecognizable. But with initial help from an environmental nonprofit and local volunteers, the Tribe chopped brush and selectively logged to mimic what fire would have accomplished had it been allowed. They also performed three cultural burns between 2005 and 2010. Some pines were too large for them to cut or burn, but the utility company PG&E serendipitously felled them later as it cleared space around its powerlines to avoid sparking wildfires. Freed from thirsty conifers, the meager spring began gushing through the summer. Within a few years, Goode says, these five verdant acres were once again worthy of the label “meadow.” A stately black oak — a favorite tree among many California Tribes — drops acorns at its margin, and Goode points out the sprawling hummocks of returned bunchgrasses, their green glow fading to straw. “These are all the fresh deergrasses,” he says. “They go way up, all the way to the farthest telephone pole now.” The link between fire and water is well-recognized among fire-dependent Indigenous cultures worldwide, says Frank Kanawha Lake, a Forest Service fire ecologist who collaborates with Goode on research. Historical records suggest that Tribes throughout California, for example, have long known that burning brush makes springs run better and helps save water, according to research by Lake, who has family ties to the Karuk and Yurok. Even in swampy Florida, the Seminole Tribe has a long history of burning in marshes and other damp ecosystems to encourage cultural and medicinal plants that require a higher water table. The Maar-speaking Indigenous peoples of southeastern Australia, meanwhile, tell a story about a vengeful cockatoo who sets a grass fire that prompts a musk duck to shake its wings, filling lakes and swamps with water. Western science is just starting to catch up with this kind of Indigenous knowledge. Tucked beyond the iconic monolith Half Dome in Yosemite National Park, north of Goode’s restored meadow, Illilouette Creek rushes past streaked granite and patches of charred pines. For almost a hundred years, federal land managers suppressed every blaze in the creek’s fire-adapted basin. Then, in 1968, the National Park Service acknowledged fire’s ecological role with a new policy of “Natural Fire Management.” The policy allowed lightning-caused wildfires to burn in zones where they didn’t threaten human health or infrastructure and where natural fuel breaks contained their reach. By 1972, Yosemite had applied the approach to granite-flanked Illilouette Creek Basin. In the following four and a half decades, wildfire remade the landscape, though not in the way of the megafires that often grab headlines today. Instead, the blazes were more frequent, smaller, and burned with varying degrees of severity — likely aided at first by the cooler, wetter climate of the 1970s and ’80s. Using aerial photography, ecohydrologist Gabrielle Boisramé and a handful of collaborators discovered that Illilouette Basin’s forest cover shrank by a quarter, more closely approximating historical conditions.  New holes appeared in the canopy, filling in with shrublands and meadow-like fields, which have more than tripled in area since 1972. In 2019, Boisramé published a model-based study that suggested these changes have made the basin modestly but notably wetter. “In the more open areas — which are maintained open by fire — you get deeper snow, and it sticks around longer,” in part because more of it reaches the ground, says Boisramé, who’s now based at the nonprofit Desert Research Institute in Nevada. “That means that water from the snowmelt is getting added to the soil later into the dry season, which is better for vegetation, and can help maintain some of those wet meadows” — as well as boost streamflows and groundwater in a region often grappling with drought. Her previous modeling also shows that fire’s return brings as much as a 30% spike in soil moisture during the summer. The extra water stored and the smaller number of trees competing for it seem to have helped Illilouette’s trees weather the state’s worst drought in centuries, even as trees in the adjacent Sierra National Forest died in droves, Boisramé says. And the type of fire diversity now found in Illilouette is connected to better long-term carbon storage and greater biodiversity, with documented benefits for bees, understory plants, bats, and birds. Teasing out fire’s precise and myriad influences on hydrology is challenging, given the many variables involved for any particular place or circumstance. However, Boisramé’s studies are part of a small but growing body of work that suggests frequent fire has long-term hydrologic benefits for ecosystems adapted to such blazes. In the mid-20th century, pioneering fire researcher Harold Biswell found that the prescribed burns he conducted on cattle ranches in the Sierra Nevada foothills helped revive summer-parched springs. That aligns with research in the western U.S. showing that some watersheds — particularly those without substantial groundwater stores to feed waterways — see more water in streams after fire, likely thanks to fewer thirsty plants. Researchers in Australia, meanwhile, recently published a paper suggesting that European colonization of southeast Tasmania created the region’s dry scrublands and devastating megafires by suppressing Indigenous burning that had maintained waterlogged heathlands. Fire has less direct benefits, too. Inspired by the knowledge of Indigenous burners in the Karuk Tribe, have shown that wildfire smoke can block enough solar radiation to cool rivers and streams by nearly 2.5 degrees Fahrenheit. In some cases, that could offer localized relief to cold-water species like salmon during the changing climate’s hottest summer days. As more scientists and conservationists recognize the ways Indigenous people shaped ecosystem biodiversity and resilience with fire, there’s an opportunity to return reciprocity to management, says Lake — and to reconnect people and place. “What is our human responsibility, and what are our human services for that ecosystem?” he asks. “How do we prescribe the right amount of fire today, fire as medicine? Traditional knowledge can guide us.” There is little question that the land needs help. Of the more than 8,200 meadows that the Forest Service has documented in the Sierra Nevada, the agency has listed 95% as unhealthy, or worse, no longer functioning as meadow ecosystems. The North Fork Mono have taken on the task of reviving some of these places in addition to the deergrass meadow that Goode showed me. Working alongside the Forest Service, they’ve begun restoring at least five others in the Sierra National Forest since 2003. In 2018, and again last year, Goode signed five-year agreements with the Forest Service that he hopes will allow the Tribe to restore many more. Those agreements explicitly acknowledge their authority to carry out Indigenous fire management. But their traditional management practices have been challenging to implement. Goode and his team have so far assessed nine meadows for restoration — and eventually, for cultural burning. They and the Forest Service are working to cut down encroaching conifers and shrubs, clear dead and fallen trees and other vegetation, create piles for burning, remove noxious weeds, clear gullies, and build structures to stabilize eroding soil. All paving the way for vibrant meadows that will hold onto water. As some elements of those projects move forward, Goode’s team has so far hit a roadblock when it comes to lighting the actual fires. According to Goode, under the agreements, “it’s us putting fire on the ground, and them participating if they wish.” But the Forest Service won’t allow someone to set a fire unless they have a “red card” obtained through rigorous firefighter training. “The forest is in dire need of restoration, and cultural burning is certainly going to be a key component going forward,” says Dean Gould, Sierra National Forest supervisor. But the agency wants to operate as safely as possible, he adds. Fire practitioners must work in forests laced with buildings and infrastructure, under unprecedented climatic conditions and huge fuel loads. For his part, Gould blames the delay mostly on a lack of capacity. Several recent historic wildfires within the national forest have kept its staff from building a more robust prescribed fire program, which would coordinate cultural burns. The COVID pandemic added other delays, as did a slew of onerous new nation-wide recommendations for prescribed fire that the Forest Service issued in 2022 after losing control of two such burns in New Mexico. Tribes hoping to implement cultural burning on federal lands commonly face challenges like the ones the Nork Fork Mono has come up against. “[B]oth state and federal agencies lack an adequate understanding of Tribes and cultural fire practitioners, their expertise and authority, land tenure, and the requirements of cultural burns,” write the authors of a report put together for the Karuk Tribe. That, in turn, has led to “confusion, delay, and red-tape,” as well as interference with tribal sovereignty. “Either we do cultural burning the way it’s supposed to be done, or we’re not going to do it,” says Goode, whose team has more than a hundred small piles of brush prepped and waiting in two Sierra National Forest meadows — ready for them to light and tend the fires before snow falls. Indigenous fire stewardship also includes cultural rituals such as burning sage, which is sacred to many Native communities of California and Mexico. Photograph by Ashley Braun Traditional practitioners often see requirements like red cards as inconsistent with cultural burning, explains Jonathan Long, a Forest Service ecologist who has worked with several Tribes on the issue. Part of the problem is that cultural burning adopts precautions in fundamentally different ways than typical agency burns do. Their intentions and practices, for example, make for safer burns as a general rule. Practitioners tend to ignite only small patches of lower-intensity fire; they welcome both youth and elders to teach and learn; they manicure away risky fuels; and they tend burns closely enough to reduce impacts on cultural resources like deergrass, as well as other plants and wildlife. It’s akin to a city installing bike lanes and traffic-slowing measures so parents can transport kids safely to school by bike, instead of strapping them in car seats inside bulky SUVs. Either way, kids arrive in one piece, but the approaches are vastly different. There’s also not yet an official playbook for cultural burning within the Forest Service to help guide agency staff, which holds the process back. But Gould says he is part of a regional effort to draft such a policy and that his staff are thinking about how to apply that in the Sierra National Forest. “I think people are trying to work through, how do we craft the system in ways that will distinguish cultural burning from the wildfire suppression and large prescribed fire events where the risks are different?” says Long. Still, Long sees more opportunities for traditional fire practices opening up, especially in California, where in recent years the state has rolled out new policies that ease barriers to cultural burning on state and private lands. And at the federal level, in late 2022 the U.S. Forest Service announced 11 major agreements to jointly manage lands with Tribes, including one that allows the Karuk Tribe to conduct cultural burns in partnership with the Six Rivers National Forest in California. The White House followed that announcement with the first-ever national guidance on Indigenous knowledge for federal agencies. The document explicitly recognized the North Fork Mono Tribe for collaborating on research examining cultural burning and climate resilience. In December, Goode’s grandnephew Valdez trained the Tule River Indian Tribe and Sequoia National Forest staff during a cultural burn at that forest. Sierra National Forest staff also attended, hoping to use the event’s success as a springboard in their own forest, according to Gould. But Goode, now facing serious health issues, is losing patience with the plodding government agency overseeing his Tribe’s homelands, and is even considering legal options for enforcing his Tribe’s right to burn. “You’re not doing it fast enough, not just for the Tribe’s benefit, but for the land,” he says. As the light retreats after the first day of burning near Mariposa, Goode and Valdez, both of whom also work as tribal archaeologists, gather the students next to a wide meadow. Goode’s wife’s property, where they’ve been working, lies within the ancestral territory of the Miwok people,  and a few years ago, Goode, Valdez, and a large volunteer contingent worked with some Miwok to clear and burn this portion of the land. These burns represent an intergenerational transfer of knowledge and culture, a core part of the practice and key to its continuity. While the sky turns citrus, the group stands atop a massive slab of granite bedrock that emerges from the sea of amber grass like the back of a gray whale. It’s pockmarked with deep, perfectly round holes, some filled with rotting leaves and recent rainwater. Here, the pair explains, the Miwok women who lived in this place at least as far back as 8,000 years ago milled acorns with stone pestles, their daily rhythms grinding permanent impressions into the stone. “They need to be cleaned and cleared out,” Goode says of the mortars. “Right now these are all deteriorating.” Like the meadow here that needed burning, even features as immutable-seeming as these bedrock mortars need tending. They need the Indigenous stewards whose hands shaped them; and people today to remember how to sustain the land. After the archaeology lesson, everyone piles back into trucks to return for dinner: foil-wrapped potatoes, roasting in the embers of today’s fire. Previously in The Revelator: Wildfires Ignite Mental Health Concerns The post Fire for Watersheds appeared first on The Revelator.

To bring more water to the landscape — and fight the growing risk of catastrophic wildfires — a Tribe in California helps to reshape fire management policy. The post Fire for Watersheds appeared first on The Revelator.

Originally published by BioGraphic.

Fire is not coming easily to the pile of dried grass and brush. Four college students fuss with the smoldering heap while Ron Goode, a bear-like man with a graying braid, leans on his cane and inspects their work. Crouch down low, he tells them. Reach farther into the brush with the lighter. Tentative orange flames spring to life and a student in a tie-dyed t-shirt blows gently, imploring them not to die.

It’s a clear November day in the western foothills of California’s Sierra Nevada near the town of Mariposa. The students, visiting from the University of California, Berkeley, are here to help revitalize a patch of live oaks that belongs to Goode’s wife’s family. Goode, the chairman of the North Fork Mono Tribe, is here to teach them how. Now in his early 70s, Goode and his Tribe have worked for decades to restore neglected meadows and woodlands on private property,  reservations belonging to other Tribes, and on their own ancestral homelands in the Sierra National Forest. And restoration, in these dry hills, calls for fire.

Dressed in cotton shirts and pants, the students feeding the thread of smoke in the oak grove look more like landscapers than a fire crew. “We’re not firefighters. We’re burners, professional burners,” Goode explains. “And we’re using Native knowledge, traditional ecological knowledge, from centuries ago.” This approach, employed by Native peoples across the world, is known as cultural burning.

Once the fire is rolling, the students use pruning shears to cut more naked stems of Ta-ka-te, or sourberry (Rhus trilobata), down to the ground and toss those onto the now crackling pile. The next morning, after the flames have devoured this fuel, Goode’s grandnephew Jesse Valdez will coach the students on how to mix the cooling ash into the soil with rakes, to fertilize the roots below.

After piles are burned and extinguished, fire practitioners will rake the ash into the soil to fertilize the roots below. Photograph by Ashley Braun

Cultural burning is a kind of gardening. This Indigenous stewardship tradition of clearing, landscaping, and burning mimics natural disturbances, which create a diverse mosaic of habitats and trigger beneficial growth patterns in certain plants. Goode, Valdez, and other practitioners use small, targeted fires to help reshape and rejuvenate landscapes, both for the overall ecological health of the land and for specific cultural purposes, from cultivating traditional foods to sustaining ceremonial practices. Fire, for instance, stimulates Mo-nop’, or deergrass (Muhlenbergia rigens), to explode with flowers. Nium people, as the Mono call themselves, use these flexible flower stalks to weave watertight baskets coiled and patterned like rattlesnakes. And towering Wi-yap’, or black oak (Quercus kelloggii) yield bushels of healthy acorns — once a staple in many Native Californian diets. Low-intensity fires discourage competing conifers, smoke out pests, and clear fuels that threaten to carry flames into the oaks’ more vulnerable crowns. Fire also improves fruit production in berry patches — another key food source for people and animals.

A closeup of an acorn cupped in a man's hand with a blurry background
Acorns were once a staple among many California Natives, accounting for up to 50 percent of Indigenous diets in the state. Photograph by Ashley Braun

Before foreign colonizers arrived and suppressed the practice, Native Californians often lit low-intensity fires to realize benefits like these. Frequent, low-intensity fire also inoculated the landscape against the kind of destructive megafires that regularly scorch the West Coast today. In fact, fire was so endemic in pre-colonial times that the total area burned in California each year was far greater than that burned by modern megafires. But instead of leaving a blackened moonscape largely devoid of life, the low-intensity fires revitalized the land.

Now, Indigenous peoples across the United States are reclaiming traditional fire stewardship practices, from California and Oregon to Minnesota and Texas. They are reviving their connections to their cultures and homelands, restoring ecosystems, boosting biodiversity, and reducing wildfire risk. In California, they’re even using fire — counterintuitively — to bring water back to the parched land.


“Let’s go way back in time,” Goode says, beginning a Nium story. “Tobahp — Land — married Pia — Water — and they had a mischievous child named Kos. And Kos is Fire. Kos liked to run around out in the forest and leave a trail, and wherever Kos went, his father Pia would follow him and sprinkle water on his trail, and his mother Tobahp would come along and plant flowers and plants.” The ancient allegory describes wildfire in the Sierra, Goode explains: After flames pass over the land, “Water is everywhere, and the first thing that starts popping up are all the cultural plants and the flowers.”

Learning to harness fire and its benefits over millennia allowed Native Californians like the Nium to create and maintain open, park-like landscapes. They wanted clear sightlines to watch for danger and protect their villages and families. And the grassy oak savannas and meadows that they tended with cultural burning were ideal for gathering food, medicines, and other supplies, as well as for travel and hunting.

Meadows are good for more than just people, says Joanna Clines, a Sierra National Forest botanist who has worked with the North Fork Mono on restoration. These wetland ecosystems are often-spring-fed and boast “a huge explosion of diversity,” Clines explains, including dozens of species of sedges, rushes, and grasses,  which in turn provide cover and forage for deer, birds, frogs, snakes, and other fauna. Wildflowers like common camas hide delicious bulbs beneath the damp soil and produce blooms that attract native butterflies and bees. Comprising just 2% of the region today — historically they may have covered more than four times that — meadows “are the gems of the Sierra Nevada,” Clines says.

But from the late 18th to the early 20th century, colonists violently removed Indigenous stewards from their meadows, and from the land. Fires were snuffed out or never lit. Indigenous people in the Sierra and beyond were killed in droves, forced to assimilate, and corralled onto reservations. Spanish missionaries were first to ban cultural burning, followed later by the U.S. government. After a devastating complex of wildfires burned 3 million acres in the Northern Rockies in 1911, Congress passed a law establishing a national forest policy of fire prevention and suppression. The Bureau of Indian Affairs later adopted it on reservations.

The land and people are still recovering from their forced separation from fire.

Fifty miles east of Mariposa, Goode surveys a meadow within the North Fork Mono’s homelands, where fragrant native mint and soaproot toast in the autumn sun, alongside a muddy spring. The meadow is part of the 1.3-million-acre Sierra National Forest. For a long time, the Tribe tended deergrass and other resources here, Goode says, but in the early 1980s, many began to feel that the national forest no longer welcomed them in this place. Without the Tribe’s ministrations, ponderosa pines marched in, along with aggressive European invaders like Scotch broom, shading out what had been the largest deergrass bed in their homelands.

In 2003, Dave Martin, a friendly new Forest Service district ranger, invited the North Fork Mono back to this meadow. When the Tribe returned, they found it unrecognizable. But with initial help from an environmental nonprofit and local volunteers, the Tribe chopped brush and selectively logged to mimic what fire would have accomplished had it been allowed. They also performed three cultural burns between 2005 and 2010. Some pines were too large for them to cut or burn, but the utility company PG&E serendipitously felled them later as it cleared space around its powerlines to avoid sparking wildfires.

Freed from thirsty conifers, the meager spring began gushing through the summer. Within a few years, Goode says, these five verdant acres were once again worthy of the label “meadow.” A stately black oak — a favorite tree among many California Tribes — drops acorns at its margin, and Goode points out the sprawling hummocks of returned bunchgrasses, their green glow fading to straw. “These are all the fresh deergrasses,” he says. “They go way up, all the way to the farthest telephone pole now.”

The link between fire and water is well-recognized among fire-dependent Indigenous cultures worldwide, says Frank Kanawha Lake, a Forest Service fire ecologist who collaborates with Goode on research. Historical records suggest that Tribes throughout California, for example, have long known that burning brush makes springs run better and helps save water, according to research by Lake, who has family ties to the Karuk and Yurok. Even in swampy Florida, the Seminole Tribe has a long history of burning in marshes and other damp ecosystems to encourage cultural and medicinal plants that require a higher water table. The Maar-speaking Indigenous peoples of southeastern Australia, meanwhile, tell a story about a vengeful cockatoo who sets a grass fire that prompts a musk duck to shake its wings, filling lakes and swamps with water.

Western science is just starting to catch up with this kind of Indigenous knowledge. Tucked beyond the iconic monolith Half Dome in Yosemite National Park, north of Goode’s restored meadow, Illilouette Creek rushes past streaked granite and patches of charred pines. For almost a hundred years, federal land managers suppressed every blaze in the creek’s fire-adapted basin. Then, in 1968, the National Park Service acknowledged fire’s ecological role with a new policy of “Natural Fire Management.” The policy allowed lightning-caused wildfires to burn in zones where they didn’t threaten human health or infrastructure and where natural fuel breaks contained their reach. By 1972, Yosemite had applied the approach to granite-flanked Illilouette Creek Basin.


In the following four and a half decades, wildfire remade the landscape, though not in the way of the megafires that often grab headlines today. Instead, the blazes were more frequent, smaller, and burned with varying degrees of severity — likely aided at first by the cooler, wetter climate of the 1970s and ’80s. Using aerial photography, ecohydrologist Gabrielle Boisramé and a handful of collaborators discovered that Illilouette Basin’s forest cover shrank by a quarter, more closely approximating historical conditions.  New holes appeared in the canopy, filling in with shrublands and meadow-like fields, which have more than tripled in area since 1972. In 2019, Boisramé published a model-based study that suggested these changes have made the basin modestly but notably wetter.

“In the more open areas — which are maintained open by fire — you get deeper snow, and it sticks around longer,” in part because more of it reaches the ground, says Boisramé, who’s now based at the nonprofit Desert Research Institute in Nevada. “That means that water from the snowmelt is getting added to the soil later into the dry season, which is better for vegetation, and can help maintain some of those wet meadows” — as well as boost streamflows and groundwater in a region often grappling with drought. Her previous modeling also shows that fire’s return brings as much as a 30% spike in soil moisture during the summer.

The extra water stored and the smaller number of trees competing for it seem to have helped Illilouette’s trees weather the state’s worst drought in centuries, even as trees in the adjacent Sierra National Forest died in droves, Boisramé says. And the type of fire diversity now found in Illilouette is connected to better long-term carbon storage and greater biodiversity, with documented benefits for bees, understory plants, bats, and birds.

Teasing out fire’s precise and myriad influences on hydrology is challenging, given the many variables involved for any particular place or circumstance. However, Boisramé’s studies are part of a small but growing body of work that suggests frequent fire has long-term hydrologic benefits for ecosystems adapted to such blazes. In the mid-20th century, pioneering fire researcher Harold Biswell found that the prescribed burns he conducted on cattle ranches in the Sierra Nevada foothills helped revive summer-parched springs. That aligns with research in the western U.S. showing that some watersheds — particularly those without substantial groundwater stores to feed waterways — see more water in streams after fire, likely thanks to fewer thirsty plants. Researchers in Australia, meanwhile, recently published a paper suggesting that European colonization of southeast Tasmania created the region’s dry scrublands and devastating megafires by suppressing Indigenous burning that had maintained waterlogged heathlands.

Fire has less direct benefits, too. Inspired by the knowledge of Indigenous burners in the Karuk Tribe, have shown that wildfire smoke can block enough solar radiation to cool rivers and streams by nearly 2.5 degrees Fahrenheit. In some cases, that could offer localized relief to cold-water species like salmon during the changing climate’s hottest summer days.

As more scientists and conservationists recognize the ways Indigenous people shaped ecosystem biodiversity and resilience with fire, there’s an opportunity to return reciprocity to management, says Lake — and to reconnect people and place. “What is our human responsibility, and what are our human services for that ecosystem?” he asks. “How do we prescribe the right amount of fire today, fire as medicine? Traditional knowledge can guide us.”


There is little question that the land needs help. Of the more than 8,200 meadows that the Forest Service has documented in the Sierra Nevada, the agency has listed 95% as unhealthy, or worse, no longer functioning as meadow ecosystems. The North Fork Mono have taken on the task of reviving some of these places in addition to the deergrass meadow that Goode showed me. Working alongside the Forest Service, they’ve begun restoring at least five others in the Sierra National Forest since 2003. In 2018, and again last year, Goode signed five-year agreements with the Forest Service that he hopes will allow the Tribe to restore many more. Those agreements explicitly acknowledge their authority to carry out Indigenous fire management. But their traditional management practices have been challenging to implement.

Goode and his team have so far assessed nine meadows for restoration — and eventually, for cultural burning. They and the Forest Service are working to cut down encroaching conifers and shrubs, clear dead and fallen trees and other vegetation, create piles for burning, remove noxious weeds, clear gullies, and build structures to stabilize eroding soil. All paving the way for vibrant meadows that will hold onto water.

As some elements of those projects move forward, Goode’s team has so far hit a roadblock when it comes to lighting the actual fires. According to Goode, under the agreements, “it’s us putting fire on the ground, and them participating if they wish.” But the Forest Service won’t allow someone to set a fire unless they have a “red card” obtained through rigorous firefighter training.

“The forest is in dire need of restoration, and cultural burning is certainly going to be a key component going forward,” says Dean Gould, Sierra National Forest supervisor. But the agency wants to operate as safely as possible, he adds. Fire practitioners must work in forests laced with buildings and infrastructure, under unprecedented climatic conditions and huge fuel loads. For his part, Gould blames the delay mostly on a lack of capacity. Several recent historic wildfires within the national forest have kept its staff from building a more robust prescribed fire program, which would coordinate cultural burns. The COVID pandemic added other delays, as did a slew of onerous new nation-wide recommendations for prescribed fire that the Forest Service issued in 2022 after losing control of two such burns in New Mexico.

Tribes hoping to implement cultural burning on federal lands commonly face challenges like the ones the Nork Fork Mono has come up against. “[B]oth state and federal agencies lack an adequate understanding of Tribes and cultural fire practitioners, their expertise and authority, land tenure, and the requirements of cultural burns,” write the authors of a report put together for the Karuk Tribe. That, in turn, has led to “confusion, delay, and red-tape,” as well as interference with tribal sovereignty.

“Either we do cultural burning the way it’s supposed to be done, or we’re not going to do it,” says Goode, whose team has more than a hundred small piles of brush prepped and waiting in two Sierra National Forest meadows — ready for them to light and tend the fires before snow falls.

A man in a wrestling tshirt holds burning sage while two other people can be seen in the background
Indigenous fire stewardship also includes cultural rituals such as burning sage, which is sacred to many Native communities of California and Mexico. Photograph by Ashley Braun

Traditional practitioners often see requirements like red cards as inconsistent with cultural burning, explains Jonathan Long, a Forest Service ecologist who has worked with several Tribes on the issue. Part of the problem is that cultural burning adopts precautions in fundamentally different ways than typical agency burns do. Their intentions and practices, for example, make for safer burns as a general rule. Practitioners tend to ignite only small patches of lower-intensity fire; they welcome both youth and elders to teach and learn; they manicure away risky fuels; and they tend burns closely enough to reduce impacts on cultural resources like deergrass, as well as other plants and wildlife. It’s akin to a city installing bike lanes and traffic-slowing measures so parents can transport kids safely to school by bike, instead of strapping them in car seats inside bulky SUVs. Either way, kids arrive in one piece, but the approaches are vastly different.

There’s also not yet an official playbook for cultural burning within the Forest Service to help guide agency staff, which holds the process back. But Gould says he is part of a regional effort to draft such a policy and that his staff are thinking about how to apply that in the Sierra National Forest.

“I think people are trying to work through, how do we craft the system in ways that will distinguish cultural burning from the wildfire suppression and large prescribed fire events where the risks are different?” says Long.

Still, Long sees more opportunities for traditional fire practices opening up, especially in California, where in recent years the state has rolled out new policies that ease barriers to cultural burning on state and private lands. And at the federal level, in late 2022 the U.S. Forest Service announced 11 major agreements to jointly manage lands with Tribes, including one that allows the Karuk Tribe to conduct cultural burns in partnership with the Six Rivers National Forest in California. The White House followed that announcement with the first-ever national guidance on Indigenous knowledge for federal agencies. The document explicitly recognized the North Fork Mono Tribe for collaborating on research examining cultural burning and climate resilience.

In December, Goode’s grandnephew Valdez trained the Tule River Indian Tribe and Sequoia National Forest staff during a cultural burn at that forest. Sierra National Forest staff also attended, hoping to use the event’s success as a springboard in their own forest, according to Gould. But Goode, now facing serious health issues, is losing patience with the plodding government agency overseeing his Tribe’s homelands, and is even considering legal options for enforcing his Tribe’s right to burn. “You’re not doing it fast enough, not just for the Tribe’s benefit, but for the land,” he says.

As the light retreats after the first day of burning near Mariposa, Goode and Valdez, both of whom also work as tribal archaeologists, gather the students next to a wide meadow. Goode’s wife’s property, where they’ve been working, lies within the ancestral territory of the Miwok people,  and a few years ago, Goode, Valdez, and a large volunteer contingent worked with some Miwok to clear and burn this portion of the land. These burns represent an intergenerational transfer of knowledge and culture, a core part of the practice and key to its continuity.

While the sky turns citrus, the group stands atop a massive slab of granite bedrock that emerges from the sea of amber grass like the back of a gray whale. It’s pockmarked with deep, perfectly round holes, some filled with rotting leaves and recent rainwater. Here, the pair explains, the Miwok women who lived in this place at least as far back as 8,000 years ago milled acorns with stone pestles, their daily rhythms grinding permanent impressions into the stone. “They need to be cleaned and cleared out,” Goode says of the mortars. “Right now these are all deteriorating.”

Like the meadow here that needed burning, even features as immutable-seeming as these bedrock mortars need tending. They need the Indigenous stewards whose hands shaped them; and people today to remember how to sustain the land. After the archaeology lesson, everyone piles back into trucks to return for dinner: foil-wrapped potatoes, roasting in the embers of today’s fire.

Previously in The Revelator:

Wildfires Ignite Mental Health Concerns

The post Fire for Watersheds appeared first on The Revelator.

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Meet the weird, wonderful creatures that live in Australia’s desert water holes. They might not be there much longer

From water fleas to seed shrimp, Australia’s desert rock holes shelter unique animals found nowhere else. But as the climate warms, their homes are at risk.

The Conversation , CC BY-NDYou might think of Australia’s arid centre as a dry desert landscape devoid of aquatic life. But it’s actually dotted with thousands of rock holes – natural rainwater reservoirs that act as little oases for tiny freshwater animals and plants when they hold water. They aren’t teeming with fish, but are home to all sorts of weird and wonderful invertebrates, important to both First Nations peoples and desert animals. Predatory damselflies patrol the water in search of prey, while alien-like water fleas and seed shrimp float about feeding on algae. Often overlooked in favour of more photogenic creatures, invertebrates make up more than 97% of all animal species, and are immensely important to the environment. Our new research reveals 60 unique species live in Australia’s arid rock holes. We will need more knowledge to protect them in a warming climate. Arid land rock holes play host to a surprisingly diverse range of invertebrates. Author provided, CC BY-ND Overlooked, but extraordinary Invertebrates are animals without backbones. They include many different and beautiful organisms, such as butterflies, beetles, worms and spiders (though perhaps beauty is in the eye of the beholder!). These creatures provide many benefits to Australian ecosystems (and people): pollinating plants, recycling nutrients in the soil, and acting as a food source for other animals. Yet despite their significance, invertebrates are usually forgotten in public discussions about climate change. Freshwater invertebrates in arid Australia are rarely the focus of research, let alone media coverage. This is due to a combination of taxonomic bias, where better-known “charismatic” species are over-represented in scientific studies, and the commonly held misconception that dry deserts are less affected by climate change. Invertebrates in desert oases include insects and crustaceans, often smaller than 5 cm in length. Invertebrates in this picture include three seed shrimp, one pea shrimp, a water flea, a water boatman and a non-biting midge larvae. Author provided, CC BY-ND Oases of life Arid rock-holes are small depressions that have been eroded into rock over time. They completely dry out during certain times of year, making them difficult environments to live in. But when rain fills them up, many animals rely on them for water. When it is hot, water presence is brief, sometimes for only a few days. But during cooler months, they can remain wet for a few months. Eggs that have been lying dormant in the sediments hatch. Other invertebrates (particularly those with wings) seek them out, sometimes across very long distances. In the past, this variability has made ecological research extremely difficult. Our new research explored the biodiversity in seven freshwater rock holes in South Australia’s Gawler Ranges. For the first time, we used environmental DNA techniques on water samples from these pools. Similar to forensic DNA, environmental DNA refers to the traces of DNA left behind by animals in the environment. By sweeping an area for eDNA, we minimise disturbance to species, avoid having to collect the animals themselves, and get a clear snapshot of what is – or was – in an ecosystem. We assume that the capture window for eDNA goes back roughly two weeks. These samples showed that not only were these isolated rock holes full of invertebrate life, but each individual rock hole had a unique combination of animals in it. These include tiny animals such as seed shrimp, water fleas, water boatman and midge larvae. Due to how dry the surrounding landscape is, these oases are often the only habitats where creatures like these can be seen. Culturally significant These arid rock holes are of great cultural significance to several Australian First Nations groups, including the Barngarla, Kokatha and Wirangu peoples. These are the three people and language groups in the Gawler Ranges Aboriginal Corporation, who hold native title in the region and actively manage the rock holes using traditional practices. As reliable sources of freshwater in otherwise very dry landscapes, these locations provided valuable drinking water and resting places to many cultural groups. Some of the managed rock holes hold up to 500 litres of water, but elsewhere they are even deeper. Diverse practices were traditionally developed to actively manage rock holes and reliably locate them. Some of these practices — such as regular cleaning and limiting access by animals — are still maintained today. Freshwater granite rock-holes are still managed using traditional practices in the Gawler Ranges region. Author provided, CC BY-ND Threatened by climate change Last year, Earth reached 1.5°C of warming above pre-industrial levels for the first time. Australia has seen the dramatic consequences of global climate change firsthand: increasingly deadly, costly and devastating bushfires, heatwaves, droughts and floods. Climate change means less frequent and more unpredictable rainfall for Australia. There has been considerable discussion of what this means for Australia’s rivers, lakes and people. But smaller water sources, including rock holes in Australia’s deserts, don’t get much attention. Australia is already seeing a shift: winter rainfall is becoming less reliable, and summer storms are more unpredictable. Water dries out quickly in the summer heat, so wildlife adapted to using rock holes will increasingly have to go without. Storm clouds roll in over the South Australian desert. Author provided, CC BY-ND Drying out? Climate change threatens the precious diversity supported by rock holes. Less rainfall and higher temperatures in southern and central Australia mean we expect they will fill less, dry more quickly, and might be empty during months when they were historically full. This compounds the ongoing environmental change throughout arid Australia. Compared with iconic invasive species such as feral horses in Kosciuszko National Park, invasive species in arid Australia are overlooked. These include feral goats, camels and agricultural animal species that affect water quality. Foreign plants can invade freshwater systems. Deeper understanding Many gaps in our knowledge remain, despite the clear need to protect these unique invertebrates as their homes get drier. Without a deeper understanding of rock-hole biodiversity, governments and land managers are left without the right information to prevent further species loss. Studies like this one are an important first step because they establish a baseline on freshwater biodiversity in desert rock holes. With a greater understanding of the unique animals that live in these remote habitats, we will be better equipped to conserve them. The freshwater damselfly visit granite rock-holes after rain and lay their eggs directly into the water. Author provided, CC BY-ND Brock A. Hedges received funding from Nature Foundation, The Ecological Society of Australia and the Department of Agriculture, Water and Environment. Brock A. Hedges currently receives funding from the Japan Society for the Promotion of Science.James B. Dorey receives funding from the University of Wollongong. Perry G. Beasley-Hall receives funding from the Australian Biological Resources Study.

Thirsty work: how the rise of massive datacentres strains Australia’s drinking water supply

The demand for use in cooling in Sydney alone is expected to exceed the volume of Canberra’s total drinking water within the next decadeSign up for climate and environment editor Adam Morton’s free Clear Air newsletter hereAs Australia rides the AI boom with dozens of new investments in datacentres in Sydney and Melbourne, experts are warning about the impact these massive projects will have on already strained water resources.Water demand to service datacentres in Sydney alone is forecast to be larger than the volume of Canberra’s total drinking water within the next decade. Continue reading...

As Australia rides the AI boom with dozens of new investments in datacentres in Sydney and Melbourne, experts are warning about the impact these massive projects will have on already strained water resources.Water demand to service datacentres in Sydney alone is forecast to be larger than the volume of Canberra’s total drinking water within the next decade.In Melbourne the Victorian government has announced a “$5.5m investment to become Australia’s datacentre capital”, but the hyperscale datacentre applications on hand already exceed the water demands of nearly all of the state’s top 30 business customers combined.Technology companies, including Open AI and Atlassian, are pushing for Australia to become a hub for data processing and storage. But with 260 datacentres operating and dozens more in the offing, experts are flagging concerns about the impact on the supply of drinking water.Sydney Water has estimated up to 250 megalitres a day would be needed to service the industry by 2035 (a larger volume than Canberra’s total drinking water).Cooling requires ‘huge amount of water’Prof Priya Rajagopalan, director of the Post Carbon Research Centre at RMIT, says water and electricity demands of datacentres depend on the cooling technology used.“If you’re just using evaporative cooling, there is a lot of water loss from the evaporation, but if you are using sealers, there is no water loss but it requires a huge amount of water to cool,” she says.While older datacentres tend to rely on air cooling, demand for more computing power means higher server rack density so the output is warmer, meaning centres have turned to water for cooling .The amount of water used in a datacentre can vary greatly. Some centres, such as NextDC, are moving towards liquid-to-chip cooling, which cools the processor or GPU directly instead of using air or water to cool the whole room.NextDC says it has completed an initial smaller deployment of the cooling technology but it has the capacity to scale up for ultra-high-density environments to allow for greater processing power without an associated rise in power consumption because liquid cooling is more efficient. The company says its modelling suggests power usage effectiveness (PUE, a measure of energy efficiency) could go as low as 1.15. Sign up to get climate and environment editor Adam Morton’s Clear Air column as a free newsletterThe datacentre industry accounts for its sustainability with two metrics: water usage effectiveness (WUE) and power usage effectiveness (PUE). These measure the amount of water or power used relative to computing work.WUE is measured by annual water use divided by annual IT energy use (kWh). For example, a 100MW datacentre using 3ML a day would have a WUE of 1.25. The closer the number is to 1, the more efficient it is. Several countries mandate minimum standards. Malaysia has recommended a WUE of 1.8, for example.But even efficient facilities can still use large quantities of water and energy, at scale.NextDC’s PUE in the last financial year was 1.44, up from 1.42 the previous year, which the company says “reflects the dynamic nature of customer activity across our fleet and the scaling up of new facilities”.Calls for ban on use of drinking waterSydney Water says its estimates of datacentre water use are being reviewed regularly. The utility is exploring climate-resilient and alternative water sources such as recycled water and stormwater harvesting to prepare for future demand.“All proposed datacentre connections are individually assessed to confirm there is sufficient local network capacity and operators may be required to fund upgrades if additional servicing is needed,” a Sydney Water spokesperson says.In its submission to the Victorian pricing review for 2026 to 2031, Melbourne Water noted that hyperscale datacentre operators that have put in applications for connections have “projected instantaneous or annual demands exceeding nearly all top 30 non-residential customers in Melbourne”.“We have not accounted for this in our demand forecasts or expenditure planning,” Melbourne Water said.It has sought upfront capital contributions from the companies so the financial burden of works required “does not fall on the broader customer base”.Greater Western Water in Victoria had 19 datacentre applications on hand, according to documents obtained by the ABC, and provided to the Guardian.skip past newsletter promotionSign up to Clear Air AustraliaAdam Morton brings you incisive analysis about the politics and impact of the climate crisisPrivacy Notice: Newsletters may contain information about charities, online ads, and content funded by outside parties. If you do not have an account, we will create a guest account for you on theguardian.com to send you this newsletter. You can complete full registration at any time. For more information about how we use your data see our Privacy Policy. We use Google reCaptcha to protect our website and the Google Privacy Policy and Terms of Service apply.after newsletter promotionThe Concerned Waterways Alliance, a network of Victorian community and environment groups, has flagged its concerns about the diversion of large volumes of drinking water to cool servers, when many of the state’s water resources are already stretched.Cameron Steele, a spokesperson for the alliance, says datacentre growth could increase Melbourne’s reliance on desalinated water and reduce water available for environmental flows, with the associated costs borne by the community. The groups have called for a ban on the use of drinking water for cooling, and mandatory public reporting of water use for all centres.“We would strongly advocate for the use of recycled water for datacentres rather than potable drinking water.”Closed-loop coolingIn hotter climates, such as large parts of Australia during the summer months, centres require more energy or water to keep cool.Danielle Francis, manager of customer and policy at the Water Services Association of Australia, says there isn’t a one-size-fits-all approach for how much energy and water datacentres use because it will depend on the local constraints such as land, noise restrictions and availability of water.“We’re always balancing all the different customers, and that’s the need for residential areas and also non-residential customers, as well as of course environmental needs,” Francis says.“It is true that there are quite a lot of datacentre applications. And the cumulative impact is what we have to plan for … We have to obviously look at what the community impact of that is going to be.“And sometimes they do like to cluster near each other and be in a similar location.”One centre under construction in Sydney’s Marsden Park is a 504MW datacentre spanning 20 hectares, with six four-storey buildings. The CDC centre will become the largest data campus in the southern hemisphere, the company has boasted.In the last financial year, CDC used 95.8% renewable electricity in its operational datacentres, and the company boasts a PUE of 1.38 and a WUE of 0.01. A spokesperson for the company says it has been able to achieve this through a closed-loop cooling system that eliminates ongoing water draw, rather than relying on the traditional evaporative cooling systems.“The closed-loop systems at CDC are filled once at the beginning of their life and operate without ongoing water draw, evaporation or waste, ensuring we are preserving water while still maintaining thermal performance,” a spokesperson says.“It’s a model designed for Australia, a country shaped by drought and water stress, and built for long-term sustainability and sets an industry standard.”Planning documents for the centre reveal that, despite CDC’s efforts, there remains some community concern over the project.In a June letter, the acting chief executive of the western health district of New South Wales, Peter Rophail, said the development was too close to vulnerable communities, and the unprecedented scale of the development was untested and represented an unsuitable risk to western Sydney communities.“The proposal does not provide any assurance that the operation can sufficiently adjust or mitigate environmental exposures during extreme heat weather events so as not to pose an unreasonable risk to human health,” Rophail said.

Costa Rica’s La Fortuna Waterfall Ranks in Top 1% Globally on TripAdvisor

La Fortuna Waterfall in Costa Rica received TripAdvisor’s “Best of the Best” award for the second straight year in the Travellers’ Choice 2025 rankings. This honor places the site among the top 1% of attractions globally, based on millions of traveler reviews and ratings. The waterfall, a key draw in the Arenal Volcano National Park […] The post Costa Rica’s La Fortuna Waterfall Ranks in Top 1% Globally on TripAdvisor appeared first on The Tico Times | Costa Rica News | Travel | Real Estate.

La Fortuna Waterfall in Costa Rica received TripAdvisor’s “Best of the Best” award for the second straight year in the Travellers’ Choice 2025 rankings. This honor places the site among the top 1% of attractions globally, based on millions of traveler reviews and ratings. The waterfall, a key draw in the Arenal Volcano National Park area, attracted roughly 1,000 visitors daily in 2024. The waterfall is about 4 kilometers from the center of La Fortuna in San Carlos, the 70-meter cascade requires a descent of about 530 steps to reach its base. The path includes safety rails, rest spots, and water stations amid native forest trees. At the site, travelers find a restaurant, gift shops, restrooms, and other services. Admission costs $10 for Costa Rican nationals and $20 for international visitors, with reduced rates for those with disabilities. A non-profit group, the Integral Development Association of La Fortuna (ADIFORT), oversees the site. Founded in 1969, ADIFORT directs revenue toward road improvements, environmental care, education, sports, cultural programs, town upkeep, and safety measures. This model ties tourism directly to local progress. The area forms part of a 210-acre biological reserve in premontane tropical wet forest, at 520 meters above sea level. It marks the headwaters of the La Fortuna River. Along the trail, visitors pass an orchid path, butterfly garden, frog habitat, and bee hotel, adding to the natural appeal. Travelers like to visit the waterfall for its clear waters and the chance to swim at the base, though heavy rains can limit access during the rainy season. Reviews highlight the well-maintained facilities and the rewarding hike, despite the steep return climb. The award reflects consistent high marks for the experience, solidifying our country’s reputation in ecotourism. Officials note that sustainable management keeps the site pristine while benefiting residents. As visitor numbers grow, the focus remains on balancing tourism with conservation. This latest win shows the waterfall’s role in showcasing not only Costa Rica’s biodiversity but also our community-driven initiatives. The post Costa Rica’s La Fortuna Waterfall Ranks in Top 1% Globally on TripAdvisor appeared first on The Tico Times | Costa Rica News | Travel | Real Estate.

People living along polluted Thames file legal complaint to force water firm to act

Residents claim raw sewage and poorly treated effluent as result of Thames Water’s failings are threat to healthCommunities across south-east England are filing the first coordinated legal complaints that sewage pollution by Thames Water negatively affects their lives.Thames Water failed to complete upgrades to 98 treatment plants and pumping stations which have the worst records for sewage pollution into the environment, despite a promise to invest in them over the last five years. Continue reading...

Communities across south-east England are filing the first coordinated legal complaints that sewage pollution by Thames Water negatively affects their lives.Thames Water failed to complete upgrades to 98 treatment plants and pumping stations which have the worst records for sewage pollution into the environment, despite a promise to invest in them over the last five years.People in 13 areas including Hackney, Oxford, Richmond upon Thames and Wokingham are sending statutory nuisance complaints to their local authorities demanding accountability from Thames Water and urgent action.At several sites it is not just raw sewage from storm overflows that causes pollution but also the quality of treated effluent coming from Thames Water facilities, which presents a direct threat to public health, the campaigners say.At Thames’s Newbury sewage treatment plant, raw effluent discharges into the River Kennet, a protected chalk stream. Data shows raw sewage discharges from the plant increased by 240% between 2019 and 2024 from 482 hours to 1,630 hours. Thames says the plant is among its 26 most polluting sites.Thames wants the water regulator, Ofwat, to allow it to charge customers £1.18bn over the next five years for the upgrades it has failed to carry out. But the regulator has refused to let it pass the full cost on to customers, allowing only £793m, as it deems bill payers have already funded the upgrades. It says any escalation of costs should be borne by Thames Water.With the company failing to act, people living in the catchment are turning to statutory nuisance complaints under section 79 of the Environmental Protection Act 1990. In letters to their local authorities, they are asking for decisive action by Thames to stop its sewage pollution that is causing harm along the river.A statutory nuisance is an activity that unreasonably interferes with the use or enjoyment of land and is likely to cause prejudice or injury to health.Those living in the area say sewage pollution from Thames’s failing sites and infrastructure has made rivers unsafe and disrupted recreation, sport, local businesses and everyday enjoyment.They cite a 16-year-old rower from Henley rowing club who became unwell after training on the river; tests confirmed he had contracted E coli. His illness coincided with his GCSE exams, preventing him from revising and sitting some papers.In West Berkshire, people are highlighting the case of a kayaker who capsized and became unwell over the following days. And at Tagg’s Island in Hampton, south-west London, five children became ill after playing in the River Thames near Hurst Park.Laura Reineke, who lives in Henley-on-Thames and founded the campaign group Friends of the Thames, said: “People here are fed up with living beside a river that’s being treated like an open sewer. We’ve submitted a nuisance complaint to our local authority because what Thames Water is doing is unacceptable.”Citizen testing of the river has found treated effluent leaving the Henley plant has contained E coli at levels 30 times higher than bathing water safe levels, calculated using Thames Water’s data released under an environmental information request.“Local residents are angry and determined to hold this company accountable for the damage it’s causing to our river and our community,” Reineke said.Thames has already received a record £104m fine by Ofwat over environmental breaches involving sewage spills across its network, after failing to operate and manage its treatment works and wastewater networks effectively.Amy Fairman, the head of campaigns at River Action, which is supporting the coordinated complaints, said: “This action is about fixing sewage pollution in the Thames for good, not compensating people for past failings.“Each local authority must investigate these complaints and, where statutory nuisance is found to exist, issue an abatement notice and take enforcement action. Councils now have a legal duty to act.”She said there was extensive evidence of performance failures at Thames Water, which was on the brink of insolvency. Despite this ministers had not put the company into special administration, a process that would allow for urgent infrastructure upgrades, put public interest ownership and governance first, and protect communities and the environment.Thames Water was approached for comment.

Gold clam invasion in NZ threatens drinking water for millions of people

The invasion threatens more than water. Clams could foul dam intakes and reduce hydroelectric efficiency in a river that generates 13% of New Zealand’s power.

Michele Melchior, CC BY-NDAs a geochemist studying New Zealand’s freshwater systems, I’ve spent years tracking the subtle chemical shifts in our rivers and lakes. But nothing prepared me for the rapid transformation unfolding in the Waikato River since the invasion of the Asian clam (Corbicula fluminea, also known as the freshwater gold clam). First detected in May 2023 in Lake Karāpiro, a reservoir lake on the Waikato, this bivalve is now altering the river’s chemistry in ways that could jeopardise drinking water for up to two million people, disrupt hydroelectric power and undermine decades of ecosystem restoration efforts. Our team’s work reveals how these clams are depleting essential minerals like calcium from the water, impairing arsenic removal during treatment and signalling a rapid escalation with broader impacts ahead. Gold clams now dominate the river bed in many areas, with densities exceeding 1,000 individuals per square metre. Michele Melchior, CC BY-ND Native to eastern Asia, the gold clam can self-fertilise and spreads via contaminated gear, birds or floods. Climate change will likely accelerate its invasion. The problem is already spreading quickly beyond the Waikato River. A recent detection in a Taranaki lake has led to waterway closures. And warnings for the Whanganui River underscore the urgent need for national vigilance. A silent invasion with big consequences The Waikato River stretches 425 km from Lake Taupō to the Tasman Sea, powering nine hydroelectric dams and supplying drinking water to Auckland, Hamilton and beyond. It’s a taonga (cultural treasure) central to Māori identity and the subject of a landmark restoration strategy, Te Ture Whaimana o Te Awa o Waikato, that aims to revive the river’s mauri (life force). In late 2024, arsenic levels in treated Waikato water briefly exceeded safe limits of 0.01 milligrams per litre (mg/L), triggering alarms at treatment plants. Investigations ruled out typical culprits such as geothermal spikes. Instead, our analysis points to the clams. By filtering water and building calcium carbonate shells, the clams are drawing down dissolved calcium by 25% below historical norms. But calcium is crucial for water treatment processes because it helps bind and remove contaminants such as arsenic. Our modelling estimates the clams are forming up to 30 tonnes of calcium carbonate daily in Lake Karāpiro alone. This suggests lake-wide densities averaging around 300 individuals per square metre. 2025 surveys show hotspots with up to 1,134 clams per square metre. The result? Impaired arsenic removal. Without stable calcium, flocs (clumps of particles) don’t form properly, letting arsenic slip through. While the exceedances were short-lived and contained through quick adjustments, they exposed vulnerabilities in a system optimised for historically consistent river chemistry. Field teams survey the rapidly expanding population of freshwater gold clams in the Waikato River. Michele Melchior, CC BY-ND How the clams are changing the river The gold clam isn’t just a filter-feeder; it’s an ecosystem engineer. Each clam can process up to a litre of water per hour, sequestering calcium for shells while releasing ammonia and bicarbonate. Our data from 2024-2025, collected at multiple sites, show these shifts are most pronounced in deeper waters. Statistical tests confirm patterns absent in pre-invasion records. Longer residence times in the reservoir lake (up to seven days) exacerbate the issue. Faster flushing correlates with higher growth rates, as clams ramp up activity. But prolonged retention in warmer months can lead to hypoxia (low oxygen), with the potential to trigger mass die-offs that release toxins or mobilise sediment-bound arsenic. Lake Karāpiro water column temperature and dissolved oxygen levels (from November 2024 to October 2025) show oxygen depletion in deep water during warmer summer conditions, likely exacerbated by the gold clam. Author provided, CC BY-NC-ND These changes threaten more than water treatment. Clams could biofoul dam intakes and reduce hydroelectric efficiency in a river that generates 13% of New Zealand’s power (25% at peak). Native species like kākahi (freshwater mussels) face competition and shifts in nutrient cycling could fuel algal blooms, clashing with restoration goals. Climate risks and stressors in a warming world Amid these ongoing changes, climate projections indicate that hot, dry events – such as prolonged heatwaves or droughts – are likely to become more frequent. Such conditions could reduce river flows and elevate water temperatures, lowering dissolved oxygen levels and creating low-oxygen zones. If clam densities continue to rise exponentially, a mass die-off might occur. This would release pulses of ammonia and organic matter that further deplete dissolved oxygen. This, in turn, could promote arsenic mobilisation from sediments and harmful algal blooms in nutrient-enriched, stagnant waters. This could necessitate supply restrictions for affected communities. Ecologically, it might kill fish and disrupt native biodiversity. Economically, it could interrupt industries reliant on the river. From the Waikato to a nationwide threat The invasion isn’t contained. The clam, which can produce up to 70,000 juveniles annually, thrives in warm, nutrient-rich waters. It is notoriously hard to eradicate once established. In mid-November, the Taranaki Regional Council confirmed the gold clam in Lake Rotomanu. Just days later, warnings were issued to boaties on the Whanganui River, urging rigorous “check, clean, dry” protocols. Without intervention, the clams could reach other systems, including the Clutha or Waitaki, and compound pressures on New Zealand’s already stressed freshwaters. Our research highlights the need for integrated action. Monitoring should expand, incorporating environmental DNA for early detection and calcium isotope tracing to pinpoint clam impacts. Water providers could trial calcium dosing during peak growth periods. But solutions must honour Te Tiriti o Waitangi principles. Collaboration with iwi and blending mātauranga Māori (indigenous knowledge) with science, such as using tikanga indicators for water health, is essential. Biosecurity measures including gear decontamination campaigns are critical to slow spread. Field teams are counting invasive gold clams on the banks of the Waikato River. Michele Melchior, CC BY-ND This invasion intersects with New Zealand’s evolving water policy framework, particularly the Local Water Done Well regime which replaced the repealed Three Waters reforms in late 2023. Councils are now implementing delivery plans and focusing on financial sustainability and infrastructure upgrades. The Water Services Authority Taumata Arawai continues as the national regulator, enforcing standards amid an estimated NZ$185-260 billion infrastructure deficit. Recent government announcements propose further streamlining, including replacing regional councils with panels of mayors or territories boards, while encouraging amalgamations to simplify planning and infrastructure delivery. These changes aim to make local government more cost-effective and responsive to issues such as housing growth and infrastructure funding. But a hot or dry event could test the effectiveness of water policy, potentially straining inter-council coordination for shared resources such as the Waikato River and highlighting gaps in emergency response. Globally, the gold clam has cost billions in damages. New Zealand can’t afford to wait. By acting now, we can protect Te Awa o Waikato and safeguard water security for generations. Adam Hartland receives funding from the Ministry of Business, Innovation and Employment via grant LVLX2302.

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