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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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A damaged King County levee awaited fixes for years. Then it failed

As an atmospheric river slammed into the Pacific Northwest, water burst through a damaged levee in Washington.

As rainfall inundated the Pacific Northwest this month, swelling the region’s rivers to record levels, the Desimone levee seemed destined to fail.Severe flooding in 2020 had damaged the 2.2-mile earthen barrier near Tukwila. Muddy waters from the Green River bubbled up on the opposite side and seeped into nearby properties. A King County report months later described the levee’s weakened state as the “most important issue” on the river’s lower reach.The years that followed were filled with red tape and bureaucratic infighting among the agencies most responsible for the region’s levee system: King County, its flood control district and the U.S. Army Corps of Engineers. All the while, cities in the flood plain clamored for help, and the Desimone awaited repair.Construction was set to begin this summer, but the Corps pulled out of the work in January, revoking promised federal funding and setting the project back years, according to interviews and public records obtained by The Seattle Times.Reagan Dunn, chair of the district’s advisory committee and a Metropolitan King County Council member, described a pattern of “tension” between the flood control district and the Corps.This month’s back-to-back atmospheric rivers pushed the levee system like never before. The Desimone was the first of two to fail.Earlier in the series of storms, water had once again begun to seep through Desimone’s earthen barrier, which shields a mostly commercial and industrial hub in Tukwila. On Monday, the river tore its way through, sparking a widespread evacuation. Officials feared the ensuing flash flood might be deadly. Workers plugged the hole quickly. Knowing the levee’s risk, they had already been watching the site for days. No injuries were reported in the breach.The patchwork nature of repairs at Desimone, and levees like it, illuminates the growing challenge of protecting Western Washington communities from flooding worsened by climate change.For generations, Washington has relied on levees as a simple solution to a complex problem, said Alan Hamlet, a former Seattle resident and scientist who now works as an associate professor of civil and environmental engineering at the University of Notre Dame. Explosive growth behind them has combined with an overarching desire to spend the minimum required for flood protection, he said. That often means deferring costlier long-term maintenance, mitigation and upgrades of these emergency barriers in favor of more pressing needs. This has resulted in higher risks for the very communities the levees were designed to protect.The state, and much of the country, stands at the nexus of that growth behind the walls of inadequate infrastructure to keep natural disasters at bay, Hamlet said.“Put all those things together and you have a hidden crisis that is going to begin to express itself more and more frequently,” Hamlet said.The 18-year-old King County Flood Control District shuffles its priority levees based on disrepair that changes with the weather. The district has started to plan for the long term, but in its earliest years, it focused on inexpensive and easy fixes in high-risk areas, Dunn said.“In other words, low-hanging fruit,” he said.Flooding in Washington state 2025Bureaucratic tangleThe Desimone levee has been damaged and repaired multiple times over the past six decades. Most recently, years of disagreements among agencies dragged out Desimone’s renovation.The flood control district asked the Corps to step in not long after the 2020 flood. High waters in the Green River then had not only left water seeping through the levee in at least three places, but also bubbling up from underneath.Federal officials agreed to spearhead a plan to repair the levee and cover 80% of the cost. It proposed estimates up to $16.6 million for a project focused solely on restoring the levee to its preflood condition, records show.Such is frequently the case for levee systems nationwide, Hamlet said. Restoring them to their original condition is typically less expensive and complicated. Expanding them or exploring other options takes more time, money and political will.But the flood district wanted more for Desimone: a design that would fix the damage and relieve water pressure further by setting the levee back, restoring some of the river’s natural bank. It was projected to cost the district about $30 million.The district’s plan would take longer and cost more but reduce long-term risks, said Michelle Clark, the district’s director. “We want to do a bigger project so that we’re not coming back to do more repairs.”The flood control district handles planning, but the project hinged on King County finding land along the river for the new work, records show. But it fell short.These types of repairs are more complicated than they might seem, Hamlet said. Strengthen a levee in one place, and you’ll send floodwaters careening into another. Set a levee back from the river, or remove one to restore a flood plain, and first you have to clear out any homes or businesses already there. These structures aren’t the only way to hold back floodwaters, but in many places, they’re the system that’s already there.A failed dealThe Corps worked in fits and starts, at one point in 2022 halting its involvement due to staffing challenges. Even when the county made headway securing land, the Corps said it had used the wrong language in the agreements. At the same time, the county accused the Corps of clerical errors that dragged out the planning process, according to county records.The county — officials for which said they were unable to immediately comment, citing the ongoing flood emergency — was confident it could secure the land, just not on schedule, according to a county brief from April. It proposed breaking ground in 2026 instead.Citing the county’s “inability” to provide the needed land along the highly developed and industrial area, the Corps backed out of the agreement in a January letter.“We have been pushing them since 2020,” Clark said. “And it’s frustrating.”The Corps “worked diligently with King County” but couldn’t move forward without land for construction, the agency wrote in an email to The Times. Levee rehabilitation can be “complex,” it added. “The federal process, sponsor timelines and real estate actions do not always align well, but we are committed to finding a solution when possible,” the agency wrote.Abandoned by the Corps, the county and its partner cities faced their biggest setback, Clark said.Everybody blamed each other as the flood season approached.Concerns heightened after the Corps pulled its support. In July, city leaders from Tukwila, Kent and Renton asked the flood district to more immediately prioritize the levee repair project.Tukwila officials declined to comment, and Kent and Renton officials did not respond to a request for comment by publication time.As the fall rains approached — and without significant improvements on the levee — officials from Tukwila, Kent, King County and the Corps of Engineers spoke in late October to review the contingency plan in case the structure failed, according to Tukwila city records. They walked the levee bank to flag logistical challenges and clarified roles and responsibilities in case of an emergency.The Corps passed along its nearly complete project design for the Desimone levee, according to its January letter to the district. But without the federal government to offset the cost, the county’s grand plan was too pricey. The district has years of research and $25 million set aside for the levee repairs, but it might not be enough, Clark said; it needs to prepare options before it can move forward with a plan.The King County Flood Control District is now, in many ways, exactly where it was in 2020: waiting for the water to recede, preparing to assess the damage and on the verge of once again planning how to fix the Desimone.--Conrad Swanson and Lulu Ramadan© 2025 The Seattle Times. Visit www.seattletimes.com. Distributed by Tribune Content Agency, LLC.

UK’s largest proposed datacentre ‘understating planned water use’

Analysis suggests consumption at Northumberland site could be 50 times higher than US operator QTS estimatesThe UK’s largest proposed datacentre is understating the scale of its planned water use, according to an analysis.The first phase of construction for the hyperscale campus in Cambois in Northumberland has been given the go-ahead by the local council. The US operator QTS, which is developing the site, has promoted its “water-free” cooling system as proof of its sustainability. Continue reading...

The UK’s largest proposed datacentre is understating the scale of its planned water use, according to an analysis.The first phase of construction for the hyperscale campus in Cambois in Northumberland has been given the go-ahead by the local council. The US operator QTS, which is developing the site, has promoted its “water-free” cooling system as proof of its sustainability.But research published this week calls that claim into question. A study of the power and water footprints of AI production by the data scientist Alex de Vries-Gao highlights the underestimated scale of indirect, or embedded, water consumption caused by datacentre operations.QTS estimates the two initial data halls will consume 2.3m litres of water annually, according to documents it submitted to Northumberland county council. Yet applying De Vries-Gao’s methodology to the electricity generation required for the site’s AI servers produces a figure more than 50 times higher, at 124m litres a year, according to analysis by Watershed Investigations and the Guardian.When all the 10 planned halls are operational, the Cambois campus could indirectly consume about 621m litres annually – equivalent to the average yearly use of more than 11,000 people.The company uses a closed-loop system, which typically reuses the same water repeatedly for cooling, but uses more energy to chill the machines. QTS says there will be no pressure on water supply for people in the north-east fromits direct datacentre operations.In a statement, QTS said: “Our power is typically carbon neutral and comes from a range of sources including wind, hydro, nuclear, tidal, etc. QTS does not control the quantity of any water utilised in the power generation process.”But according to De Vries-Gao, datacentre operators must acknowledge the water footprint linked to their massive energy demands, in the same way that power-intensive industries are held accountable for the carbon emissions generated by their electricity consumption.De Vries-Gao said: “The datacentre operator will be responsible for creating the power demand which leads to the consumption of this water. For the same reason, the greenhouse gas protocol already mandates disclosure of indirect emissions related to electricity consumption.”Another potentially understated problem is the air pollution from the datacentre from increased power generation and potential greater use of diesel generators than stated.In the US, researchers and environmental groups have sounded the alarm about worsening air quality as a result of growing emissions of fine particulate matter and nitrogen oxides (NOx) from the power plants and backup generators datacentres rely on. Increased emissions are a result of surging power demand to produce AI systems, according to a recent study. According to Shaolei Ren of the University of California, one of the study’s authors, the evidence connecting datacentre growth to harmful health outcomes from air pollution is already “very strong”.“What is missing is awareness and precise quantitative accounting. The critical gap is that we still do not know, in a transparent and systematic way, how much criteria air pollution data centres actually contribute at the local and regional levels,” Ren said.Common pollutants include ozone, fine particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide and lead, which damage human health and the wider environment.This pollution is not only the result of electricity generation from the grid. A proportion often comes from highly-polluting diesel generators, installed to ensure the nearly constant “uptime” demanded by the datacentre and AI industry.Once complete, the Cambois campus will rely on nearly 600 diesel generators for “backup” power – up to 58 per data hall. QTS estimates that regular testing of the system would mean running each generator for five hours a year.The generators have been designated as a backup power system to be used in emergencies if the grid fails. But in Virginia’s “datacentre alley”, a hub where QTS has a datacentre, regulators are considering expanding diesel generator use for planned outages, while environmentalists have warned of pressure to permit generators during grid stress.Julie Bolthouse from the Piedmont Environmental Council, a conservation organisation, said: “They are incrementally increasing under what circumstances they can run and de facto how frequently and how long they can run the thousands of generators we have permitted here in Virginia. Once the generators are in place it is only a matter of time before they use them.”The potential impact of this scenario playing out in Cambois could have negative effects on the local community’s health. Cambois primary school’s playground has been identified by QTS as directly affected by emissions from the generators.In a statement, QTS said: “Generators can occasionally be utilised on a temporary basis to bridge power needs while permanent connections are finalised, but the primary use of generators is for emergency backup purposes.“Diesel generators are not the main source of power for our datacentres. Generators are tested once a month for a short period of time for routine maintenance. Each data centre has a publicly available emissions limit and our normal operations are designed to stay well within those requirements. In the highly unlikely event of a complete grid outage in the UK, backup generators would run only for the duration of such grid outage and at reduced power. Regarding Virginia, QTS has zero control over our competitors.”

These giant sea reptiles lived in freshwater rivers, too

Scientists thought mosasaurs - giant sea reptiles - lived in oceans. But the discovery of fossils in North Dakota shows they may also have lived in freshwater. The post These giant sea reptiles lived in freshwater rivers, too first appeared on EarthSky.

Watch Melanie During of Vrije University in the Netherlands talk about mosasaurs in the late Cretaceous. Researchers found a tooth from a mosasaur in North Dakota that dates back 66 million years. The find suggests these giant sea reptiles lived in freshwater as well as oceans. Video via Genuine Rockstars (Dennis Voeten and Melanie During). EarthSky’s 2026 lunar calendar is available now. Get yours today! Makes a great gift. Mosasaurs were the apex predators of the sea during the late Cretaceous, 94 to 66 million years ago. But they also lived in freshwater habitats, such as rivers, according to a new study. Environmental changes during the late Cretaceous may have driven mosasaurs to adapt to freshwater areas in North America’s inland sea. Chemical analysis of a mosasaur tooth reveals a surprise Mosasaurs were giant aquatic reptiles that lived 94 to 66 million years ago. While T. rex was the dominant predator on land, mosasaurs were the apex predators of the sea. But scientists from Uppsala University in the Netherlands said on December 12, 2025, that they have new evidence showing mosasaurs also lived in freshwater, in inland rivers. Their diverse habitats suggest they were adapting to a changing environment. In 2022, researchers found a mosasaur tooth at an unexpected location in North Dakota. They recovered it from ancient river deposits alongside a T. rex tooth and the jawbone of a freshwater crocodile-like (or crocodilian) reptile. Plus, the area was known for its fossilized Edmontosaurus duck-billed dinosaurs. How did a seagoing mosasaur’s tooth end up in a freshwater river? In this new study, scientists found answers in the mosasaur’s tooth enamel. A chemical analysis of certain elements revealed that this mosasaur had, in fact, lived in freshwater, not salt water. The researchers published their study in the peer-reviewed journal BMC Zoology on December 12, 2025. Artist’s concept of a mosasaur in a river, having just caught a crocodilian. In this new study, scientists suggest that late Cretaceous mosasaurs could have lived in freshwater. Image via Christopher DiPiazza/ Uppsala University. These giant sea reptiles were apex water predators Mosasaurs were large swimming reptiles of the late Cretaceous, 94 to 66 million years ago. Scientists have found most of their fossils in marine deposits, therefore associating mosasaurs as sea creatures. Along with most dinosaurs, mosasaurs perished 66 million years ago, during the K-Pg extinction event. That’s when a massive asteroid crashed into our planet, causing the extinction of many species. Scientists think the tooth they studied came from a mosasaur of the genus Prognathodon. These creatures had bulky heads with sturdy jaws and teeth. The tooth was about 1.2 inches (30 mm) long. Therefore, based on what they knew about other, more complete mosasaur fossils, the researchers extrapolated the size of this individual to 36 feet (11 meters) in length. That’s about the size of a bus. Per Ahlberg, of Uppsala University in Sweden, is a paper co-author. He said: The size means that the animal would rival the largest killer whales, making it an extraordinary predator to encounter in riverine environments not previously associated with such giant marine reptiles. On the left, different views of the mosasaur tooth. On the right, an image of the T. rex tooth in the ground. The red rectangle shows the location where the mosasaur tooth was recovered. Image via During, M. A. D., et al./ BMC Zoology (CC BY 4.0). Probing the tooth enamel with isotope analysis For some elements, an atom has the same number of protons but a different number of neutrons. These different forms of an element are called isotopes. For example, carbon-12, carbon-13 and carbon-14 are three carbon isotopes. They all have six protons. But they also have six, seven and eight neutrons, respectively. The ratio of isotopes for an element can vary depending on the type of environment. In this study, the scientists looked at three elements: oxygen, strontium and carbon. They found there was more oxygen-16 in their mosasaur’s tooth enamel compared to mosasaurs found in marine environments. Therefore, they concluded, this animal lived in freshwater. Strontium isotope ratios also suggested the same. Melanie During of Vrije University in The Netherlands is the paper’s lead author. She said this about carbon isotope ratios they found: Carbon isotopes in teeth generally reflect what the animal ate. Many mosasaurs have low carbon-13 values because they dive deep. The mosasaur tooth found with the T. rex tooth, on the other hand, has a higher carbon-13 value than all known mosasaurs, dinosaurs and crocodiles, suggesting that it did not dive deep and may sometimes have fed on drowned dinosaurs. The isotope signatures indicated that this mosasaur had inhabited this freshwater riverine environment. When we looked at two additional mosasaur teeth found at nearby, slightly older, sites in North Dakota, we saw similar freshwater signatures. These analyses shows that mosasaurs lived in riverine environments in the final million years before going extinct. Melanie During prepares a sample of the mosasaur tooth for strontium isotope analysis. Via Melanie During/ Uppsala University. An ancient sea in North America During the late Cretaceous, an inland sea divided North America, separating the east and west sides of the continent. This sea is known as the Western Interior Seaway. The amount of freshwater entering this sea increased over time. As a result, the seawater gradually transformed from salt water to brackish water, and then to mostly fresh water. The scientists think that this created a halocline. In other words, salt water – which is heavier because of dissolved salts – formed a layer at the bottom of the sea. Meanwhile, the lighter freshwater sat on top of it. These giant sea reptiles might have lived in freshwater Ahlberg commented that their isotope analysis confirms the theory about halocline conditions in the Western Interior Seaway: For comparison with the mosasaur teeth, we also measured fossils from other marine animals and found a clear difference. All gill-breathing animals had isotope signatures linking them to brackish or salty water, while all lung-breathing animals lacked such signatures. This shows that mosasaurs, which needed to come to the surface to breathe, inhabited the upper freshwater layer and not the lower layer where the water was more saline. Late Cretaceous mosasaurs may have adapted to the changing salinity of the inland sea. During said: Unlike the complex adaptation required to move from freshwater to marine habitats, the reverse adaptation is generally simpler. The scientists cited modern examples of these adaptations. For instance, river dolphins live in freshwater but they’re descended from marine ancestors. The saltwater crocodile in Australia is able to move between freshwater rivers and the sea. Bottom line: Scientists used to think that mosasaurs were exclusively sea-dwellers. But new research suggests that North American late Cretaceous mosasaurs might have lived in freshwater. Source: “King of the Riverside”, a multi-proxy approach offers a new perspective on mosasaurs before their extinction Via Uppsala University Read more: Nanotyrannus, a T. rex mini-me, coexisted with the big guysThe post These giant sea reptiles lived in freshwater rivers, too first appeared on EarthSky.

2025’s AI boom caused huge CO2 emissions and use of water, research finds

Study’s author says society not tech companies paying for environmental impact of AI and asks if this is fairThe AI boom has caused as much carbon dioxide to be released into the atmosphere in 2025 as emitted by the whole of New York City, it has been claimed.The global environmental impact of the rapidly spreading technology has been estimated in research published on Wednesdaywhich also found that AI-related water use now exceeds the entirety of global bottled-water demand. Continue reading...

The AI boom has caused as much carbon dioxide to be released into the atmosphere in 2025 as emitted by the whole of New York City, it has been claimed.The global environmental impact of the rapidly spreading technology has been estimated in research published on Wednesdaywhich also found that AI-related water use now exceeds the entirety of global bottled-water demand.The figures have been compiled by the Dutch academic Alex de Vries-Gao, the founder of Digiconomist, a company that researches the unintended consequences of digital trends. He claimed they are the first attempt to measure the specific effect of artificial intelligence rather than datacentres in general as the use of chatbots such as OpenAI’s ChatGPT and Google’s Gemini soared in 2025.The figures show the estimated greenhouse gas emissions from AI use are also now equivalent to more than 8% of global aviation emissions. His study used technology companies’ own reporting and he called for stricter requirements for them to be more transparent about their climate impact.“The environmental cost of this is pretty huge in absolute terms,” he said. “At the moment society is paying for these costs, not the tech companies. The question is: is that fair? If they are reaping the benefits of this technology, why should they not be paying some of the costs?”De Vries-Gao found that the 2025 carbon footprint of AI systems could be as high as 80m tonnes, while the water used could reach 765bn litres. He said it was the first time AI’s water impact had been estimated and showed that AI water use alone was more than a third higher than previous estimates of all datacentre water use.The figures are published in the academic journal Patterns. The International Energy Agency (IEA) said earlier this year that AI-focused datacentres draw as much electricity as power-thirsty aluminium smelters and datacentre electricity consumption is expected to more than double by 2030.“This is yet more evidence that the public is footing the environmental bill for some of the richest companies on Earth,” said Donald Campbell, the director of advocacy at Foxglove, a UK non-profit that campaigns for fairness in tech. “Worse, it is likely just the tip of the iceberg. The datacentre construction frenzy, driven by generative AI, is only getting started.“Just one of these new ‘hyperscale’ facilities can generate climate emissions equivalent to several international airports. And in the UK alone, there are an estimated 100-200 of them in the planning system,” said Campbell.The IEA has reported that the largest AI-focused datacentres being built today will each consume as much electricity as 2m households with the US accounting for the largest share of datacentre electricity consumption (45%) followed by China (25%) and Europe (15%).The largest datacentre being planned in the UK, at a former coal power station site in Blyth, Northumberland, is expected to emit more than 180,000 tonnes of CO2 a year when at full operation – the equivalent to the amount produced by more than 24,000 homes.In India, where $30bn (£22.5bn) is being invested in datacentres, there are growing concerns that a lack of reliability from the National Grid will mean the construction of huge diesel generator farms for backup power, which the consultancy KPMG this week called “a massive … carbon liability”.Technology companies’ environmental disclosures are often insufficient to assess even the total datacentre impact, never mind isolating AI use, said De Vries-Gao. He noted that when Google recently reported on the impact of its Gemini AI, it did not account for the water used in generating the electricity needed to power it.Google reported that in 2024 it managed to reduce energy emissions from its datacentres by 12% due to new clean energy sources, but it said this summer that achieving its climate goals was “now more complex and challenging across every level – from local to global” and “a key challenge is the slower-than-needed deployment of carbon-free energy technologies at scale”.Google was approached for comment.

EU waters down plans to end new petrol and diesel car sales by 2035

Carmakers, particularly in Germany, have lobbied heavily for concessions to the planned rules.

The European Commission has watered down its plans to ban the sale of new petrol and diesel vehicles by 2035.Current rules state that new vehicles sold from that date should be "zero emission", but carmakers, particularly in Germany, have lobbied heavily for concessions.Under the European Commission's new plan, 90% of new cars sold from 2035 would have to be zero-emission, rather than 100%.According to the European carmakers association, ACEA, market demand for electric cars is currently too low, and without a change to the rules, manufacturers would risk "multi-billion euro" penalties.The remaining 10% could be made up of conventional petrol or diesel cars, along with hybrids.Carmakers will be expected to use low-carbon steel made in the EU in the vehicles they produce.The Commission also expects an increase in the use of biofuels and so-called e-fuels, which are synthesised from captured carbon dioxide, to compensate for the extra emissions created by petrol and diesel vehicles. Opponents of the move have warned that it risks undermining the transition towards electric vehicles and leaving the EU exposed in the face of foreign competition.The green transport group T&E has warned that the UK should not follow the EU's lead by weakening its own plans to phase out the sale of conventional cars under the Zero Emission Vehicles Mandate."The UK must stand firm. Our ZEV mandate is already driving jobs, investment and innovation into the UK. As major exporters we cannot compete unless we innovate, and global markets are going electric fast," said T&E UK's director Anna Krajinska.Ahead of the announcement, Sigrid de Vries, director general at ACEA, said that "flexibility" for manufacturers was "urgent"."2030 is around the corner, and market demand is too low to avoid the risk of multi-billion-euro penalties for manufacturers," she said."It will take time to build the charging points and introduce fiscal and purchase incentives to get the market on track. Policy makers must provide breathing space to manufacturers to sustain jobs, innovation and investments."Carmakers in the UK have previously called for better incentives to encourage drivers to buy electric ahead of the government's planned ban on sales of new petrol and diesel vehicles by 2030.Firms across the world have been changing their production lines and investing billions as governments try to persuade people to drive greener cars to meet environmental targets.Volvo said it had "built a complete EV portfolio in less than 10 years" and was prepared to go fully electric, using hybrids as a transition. It argued if it can move away from petrol and diesel vehicles, other companies should be able to as well.The carmaker said: "Weakening long-term commitments for short-term gain risks undermining Europe's competitiveness for years to come. "A consistent and ambitious policy framework, as well as investments in public infrastructure, is what will deliver real benefits for customers, for the climate, and for Europe's industrial strength."However, German carmaker Volkswagen welcomed the European Commission's draft proposal on new CO₂ targets, calling it "economically sound overall".It said: "The fact that small electric vehicles are to receive special support in future is very positive. It is extremely important that the CO₂ targets for 2030 are made more flexible for passenger cars and adjusted for light commercial vehicles."Opening up the market to vehicles with combustion engines while compensating for emissions is pragmatic and in line with market conditions."Colin Walker, head of transport at the Energy and Climate Intelligence Unit (ECIU) think tank, said the UK having "stable policy" would give companies the confidence to invest in charging infrastructure and avoid "jeopardising investments"."It was government policy that saw Sunderland chosen to build Nissan's original electric Leaf, and today the latest Nissan EV has started rolling off the production lines in the North East, securing jobs for years to come," he said.Octopus Electric Vehicles chief executive Fiona Howarth warned that if the UK reduced its goals because of changes in Brussels, it would send a "damaging signal to investors, manufacturers and supply-chain partners".Many of these groups have already invested heavily in the transition "on the assumption the UK would stay the course," she said.

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