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A Firm Bought Up Land in a Tiny Arizona Town—Then Sold Its Water to a Faraway Suburb

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Wednesday, April 17, 2024

This story was originally published by the Guardian and is reproduced here as part of the Climate Desk collaboration. One of the biggest battles over Colorado River water is being staged in one of the west’s smallest rural enclaves. Tucked into the bends of the lower Colorado River, Cibola, Arizona, is a community of about 200 people. Maybe 300, if you count the weekenders who come to boat and hunt. Dusty shrublands run into sleepy residential streets, which run into neat fields of cotton and alfalfa. Nearly a decade ago, Greenstone Resource Partners LLC, a private company backed by global investors, bought almost 500 acres of agricultural land here in Cibola. In a first-of-its-kind deal, the company recently sold the water rights tied to the land to the town of Queen Creek, a suburb of Phoenix, for a $14 million gross profit. More than 2,000 acre-feet of water from the Colorado River that was once used to irrigate farmland is now flowing, through a canal system, to the taps of homes more than 200 miles away. When the water was diverted last year, alfalfa and cotton fields turned to dry brush and cracked earth. Many of the townspeople were blindsided.  A Guardian investigation into the unprecedented water transfer, and how it took shape, reveals that Greenstone strategically purchased land and influence to advance the deal. The company was able to do so by exploiting the arcane water policies governing the Colorado River. Experts expect that such transfers will become more common as thirsty towns across the west seek increasingly scarce water. The climate crisis and chronic overuse have sapped the Colorado River watershed, leaving cities and farmers alike to contend with shortages. Amid a deepening drought and declines in the river’s reservoirs, Greenstone and firms like it have been discreetly acquiring thousands of acres of farmland. As US states negotiate how they will divide up the river’s dwindling supplies, officials challenging the Greenstone transfer in court fear it will open the floodgates to many more private water sales, allowing investors to profit from scarcity. The purchases have alarmed local residents, who worry that water speculators scavenging agricultural land for valuable water rights will leave rural communities like Cibola in the dust. “Here we are in the middle of a drought and trying to preserve the Colorado River, and we’re allowing water to be transferred off of the river,” said Regina Cobb, a former Republican state representative who has tried to limit transfers. “And in the process, we’re picking winners and losers.” In February, a federal judge ruled that the Cibola-Queen Creek transfer was done without proper environmental review, ordering the federal Bureau of Reclamation to complete a more thorough evaluation. The Department of Justice, which is representing the bureau in the legal proceeding, declined to comment on whether the bureau would be appealing the decision. Meanwhile, Greenstone—which appears to be the first water brokerage firm to sell rights to the Colorado River—could help chart the course of how the resource can be bought and sold in the west. Greenstone first arrived in Cibola a decade ago—though few here knew anything of the company at the time. Through a subsidiary called GSC Farm LLC, the company purchased 485 acres of land in the Cibola valley in 2013 and 2014, for about $9.8 million. Hardly anyone in town took notice. “Why would we?” said Holly Irwin, a supervisor for La Paz county, which encompasses Cibola. Initially, Greenstone leased that land back to farmers, who planted fields of alfalfa and rows of puffball cotton. Then, in 2018, the company sold the water tied to that farmland to Queen Creek, a fast-growing sprawl of gated communities on the outskirts of Arizona’s capital. The city’s government agreed to pay the company $24 million for the annual entitlement to 2,033 acre-feet of Colorado River water. In July of last year, amid continuing legal challenges and national scrutiny, that water was finally diverted. The alfalfa and cotton fields were fallowed—reduced to dry brush and cracked earth. Many in town were blindsided. “We were all just like: ‘What the heck?’” Irwin recalled. GSC Farm, she realized, wasn’t really a farm at all—it was part of a water investment firm that had brokered water transfer deals all across the south-west. Greenstone’s financial backers include the global investment firm MassMutual and its subsidiary Barings, as well as public pension funds. GSC Farm is one of at least 25 subsidiaries and affiliates of Greenstone, registered in Arizona and other states. Business registration records, deeds, loan documents and tax records show that these companies share the same executives. To local residents, including elected officials such as Irwin, it was initially unclear that the business—which had been acquiring thousands of acres of farmland not only in Cibola but across Arizona—went by so many names. Greenstone’s executives and lawyers did not respond to the Guardian’s questions about the company’s corporate structure, its business model, and how it initiated the Queen Creek deal. Public records revealed that Greenstone’s financial backers include the global investment firm MassMutual and its subsidiary Barings, as well as public pension funds. At least one of its acquisitions appears to be financed by Rabo AgriFinance, a subsidiary of the Dutch multinational banking and financial services company Rabobank. On its website, Greenstone describes itself as “a water company” and as “a developer and owner of reliable, sustainable water supplies,” Its CEO, Mike Schlehuber, previously worked for Vidler Water Company—another firm that essentially brokers water supply—as well as Summit Global Management, a company that invests in water suppliers and water rights. Greenstone’s managing director and vice-president, Mike Malano—a former realtor based in Phoenix who remains “active in the Arizona development community,” per his company bio—got himself elected to the board of the Cibola valley irrigation and drainage district, a quasi-governmental organization that oversees the distribution of water for agriculture in the region. Irwin was horrified. She felt that a company with ties to big banks and real estate developers, posing as a farm, had infiltrated her small town and sold off its most precious resource. The deal won’t have an immediate impact on Cibola’s residents. It doesn’t affect the municipal water supply. But she worries that the transfer will be the first of many. And if more and more farms are fallowed to feed water to cities, what will become of rural towns along the river? “It’ll be like Owens Valley,” she said, referring to the water grab that inspired the movie Chinatown. In the early 20th century, agents working for the city of Los Angeles, posing as farmers or ranchers, bought up land in the valley and diverted its water to fuel their metropolis, leaving behind a dustbowl. “The Cibola valley irrigation and drainage district was set up by people who were investing in water, rather than pure agriculturalists,” By allowing the Greenstone deal to go through, “I’m afraid we’ve opened Pandora’s box,” she said. The Colorado River, which stretches from the Rocky Mountains into Mexico, has declined by about 20% since the turn of the century, amid the most severe drought the west has seen in 1,200 years. In a painfully negotiated deal, Arizona, Nevada and California agreed to reduce the amount of water they draw from the river by 13% through 2026. Experts warned that even deeper cuts would be necessary in the coming decade, but states are currently deadlocked over a longer-term conservation plan. “With ongoing shortages on the river, driven by climate change, Colorado River water is going to become very valuable,” said Rhett Larson, a professor of water law at Arizona State University. “Anyone who understands this dynamic thinks, ‘Well, if I could buy Colorado River water rights, that’s more valuable than owning oil in this country at this stage.’” Though the price Queen Creek paid for the water was remarkable—amounting to more than $11,500 per acre-foot—lawyers and water experts in Arizona told the Guardian it would probably sell for even more today. The process of selling and transferring the water, however, can be bureaucratic and complicated. In most cases, a company like Greenstone would have to first convince fellow landowners in their local irrigation district to allow the sale, and then secure approvals from the state department of water resources and the US Bureau of Reclamation, the federal agency that manages water in the west. What Irwin and many of Cibola’s residents didn’t realize was that in their sleepy, riverside town, a select group of farmers and landowners had been working for years to facilitate such deals. Irrigation districts, as the name suggests, are designed to distribute water for irrigation across the US west. These districts were formed in the 19th and 20th centuries as cooperatives, allowing farmers to pool resources to develop water infrastructure. In the Colorado River basin, the districts contract with the Bureau of Reclamation to deliver water flowing through federal infrastructure to farms and ranches. Farmers tend to be possessive of their precious water, explained Susanna Eden of the University of Arizona Water Resources Research Center. Most irrigation districts are set up to keep water for farming—and to keep it within their jurisdictions. But in the Cibola valley irrigation and drainage district (CVIDD), landowners seem to have anticipated the market potential of their water. “It has been said, and I think it has been demonstrated, that the Cibola valley irrigation and drainage district was set up by people who were investing in water, rather than pure agriculturalists,” said Eden. In 1992, long before Greenstone arrived on the scene, CVIDD amended its contract with the Bureau of Reclamation to explicitly contemplate “water exchange, water lease, water transfer” or a change in the “type or place of use” of its water allotment. The CVIDD board president, Michael Mullion, a farmer in Cibola who had been leasing land from GSC Farm in addition to tending his own land, vouched for the Greenstone’s water transfer at a 2019 hearing with the state’s department of water resources. In his testimony, Mullion talked about how his grandfather had come to the Cibola valley in 1949. “He brushed, cleared, leveled and built the canals for this particular ground,” he said. “But his dream was to actually sell this water.” “Don’t we have water rights?” asked a longtime local. “I have a right to that water, because I’m paying for it.” The district’s governing philosophy already aligned with Greenstone’s, but the company’s 500-acre purchase here allowed it to more directly influence the district’s policies. Irrigation district boards make key decisions about water in the district—and buying more land can buy more influence on the board. Landowners in the district are entitled to two votes for every acre they hold in board elections. The district’s board of directors now includes the heads of prominent farming families in the area, including Mullion and his father, Bob, as well as Greenstone’s vice-president, Malano. Over the years, CVIDD helped landowners, including Greenstone, gain more agency and direct control over their water rights. In most irrigation districts, the district contracts with the Bureau of Reclamation for the right to a lump sum of water, which it distributes to landowners and farmers. However, a review of CVIDD’s contracts with the bureau revealed that between 2006 and 2014, the district began removing itself as the middleman—giving a few large landowners even more agency over how they use their water. Whereas in other irrigation districts, members would have to vote to approve a water transfer like the Greenstone deal, in the Cibola valley, some landowners can propose transfers as they please, subject to federal approval. Amid growing public scrutiny of the Cibola-Queen Creek transfer, the CVIDD board in 2019 unanimously approved a resolution disputing the idea that water rights are reserved for local use, and supporting landowners’ right to change “the place of use and purpose of use” of their water. “I believe they’ve been setting the stage for the Queen Creek transfer,” said Jamie Kelley, an attorney based in Bullhead City. “This was their long-term plan.” Mullion and lawyers representing CVIDD did not respond to the Guardian’s questions about its founding principles. They also did not address critiques that their policies were set up to benefit landowners seeking to sell water rights. Even now, after years of public debate and litigation, local residents remain baffled by the idea that water could be sold and syphoned away from them, for ever. Down a dusty, two-lane road, just past the unassuming cream-colored building where the Cibola valley irrigation district is headquartered, a group gathered for an informal meeting with Holly Irwin last summer to discuss their grievances. “Why is somebody coming from so far away to take water from here?” said Carol Stewart, who runs B&B convenience store—the only shop in town. She hosted a handful of friends and neighbors, mostly retirees and recreators who had settled here decades ago. Everyone huddled into Stewart’s wood-paneled RV trailer, a respite from the searing heat, and shouted their questions over the buzz of the AC. What did the transfer mean? Would they have enough water to supply homes here? “It’s all about the mighty dollar,” Irwin said. “It’s all about money, and how much they can come in and take advantage.” This deal wouldn’t affect the town’s residential water supplies, Irwin explained. But it meant that more and more farmers might choose to sell out—the water that once irrigated Cibola’s fields could be diverted away. And as the Colorado River shrank, corporations were growing increasingly thirsty for rural supplies. “Don’t we have water rights?” asked John Rosenfeld, who has lived in Cibola for 24 years. “I have a right to that water, because I’m paying for it.” It wasn’t quite that simple, Irwin responded. Most of Cibola’s residents get their water from a municipal supply or from private wells. But some properties here come with water rights attached, sometimes dating back to before Arizona was a US state. In the 1800s and the decades following, miners and farmers could snatch water rights up and down the Colorado River simply by laying claim to the water and putting it to use for livestock or irrigating land. It didn’t matter to these settlers that some of that water and land was taken from Indigenous tribes that were here before them. “Future transfers will be likely, if not inevitable,” wrote the state’s attorney general, “given the need for water across Arizona.” Those water rights were then passed down from generation to generation. They were formalized in agreements and interstate contracts that left some farming regions and tribes with the highest-priority water rights, while other rural and metropolitan areas received lower-priority rights. Such contracts assign water rights a “priority level” of one through six—priorities one through four represent rights for permanent water service, whereas priorities five and six represent the temporary rights to surplus supplies. The water rights Greenstone purchased in Cibola and sold to Queen Creek are fourth priority—permanently secured and prized. Notably missing from the group at B&B were farmers. The Guardian tried to contact a number of farmers in the region, but other than Mullion, none were available for an interview. Not all agriculturalists are interested in selling their water—but the option may be increasingly appealing as the climate crisis and water shortages disrupt their ability to effectively farm. “It’s hard to know, but demands create pressure,” said Wade Noble, an attorney representing farmers with the Wellton-Mohawk irrigation and drainage district, north of Cibola. “The drought on the river has created very high pressure.” Greenstone isn’t the only company coveting such water rights. Across the US west, private investors have been scouring rural communities in search of high-priority water rights. In Arizona, Greenstone and firms like it have acquired thousands of acres of irrigable land and their corresponding water rights. In the Cibola valley, for example, Western Water LLC, another company that specializes in “the sale and transfer of water rights,” owns about 100 acres of land, along with its entitlement to a modest 620 acre-feet of water, public records from the Bureau of Reclamation and La Paz county showed. Before the Bureau of Reclamation approved Greenstone’s water transfer to Queen Creek, an investigation by the Arizona Republic found that Greenstone and its competitors had acquired thousands of acres of irrigable land across Arizona, including in La Paz, Pinal, Maricopa, Mohave and Yuma counties. The newspaper’s reports were cited by local officials who argued that Greenstone’s water transfer to Queen Creek would be a harbinger of many more such deals, as water becomes increasingly scarce across the west. A Guardian review of deeds and other public records found that in Yuma county, companies associated with Greenstone hold about 5,300 acres of farmland, much of it within the Wellton-Mohawk irrigation and drainage district. Taxes on those lands were paid by Sunstone Farms LLC, a Greenstone subsidiary that leases agricultural properties. There, unlike in CVIDD, individual landowners cannot initiate water transfer agreements on their own. But because votes within Wellton-Mohawk are also weighted based on how much land someone owns, larger landowners could seek more influence on its board. County records indicate that a Greenstone-affiliated LLC is one of the largest landowners in the district. Meanwhile to the north, in Mohave county, Greenstone’s competitor Water Asset Management holds more than 2,400 acres, and access to nearly 16,000 acre-feet of water, per public records from the county. In 2022, La Paz along with Mohave and Yuma counties filed a lawsuit against the Bureau of Reclamation, challenging its claim that the deal would cause “no significant” environmental impact. “We are arguing in our lawsuit that Reclamation did not analyze the precedent that this transfer set,” said John Lemaster, an attorney representing Mohave county. “The entire purpose of Greenstone is to develop and sell water resources. We know future transfers are likely.” Queen Creek recently signed a deal to syphon off 5,000 acre-feet of groundwater a year from the Harquahala valley to feed its gated communities and subdivisions. This year, a federal judge in Arizona sided with them, ruling that the Bureau of Reclamation’s environmental evaluation was “arbitrary and capricious” and ordering the agency to prepare a more thorough assessment. While it’s unclear how the agency will proceed, given that water is already flowing to Queen Creek, the outcome could define how future deals are made and who can lay claim to the Colorado River’s water. Greenstone, meanwhile, has tried to play down the significance of the transfer. At a March 2022 committee hearing to discuss a bill introduced by Cobb, the former state representative who tried to limit water transfers, Malano balked at descriptions of his company as a hedge fund, describing Greenstone as “one of the largest farming operations in the state of Arizona,” Indeed, Greenstone and its competitors, such as Water Asset Management, often lease their land to farmers. But Greenstone’s ultimate goal, per its website, “is to advance water transactions,” And it has been busy doing so. In 2017, it helped secure the right to Rio Grande water for a Facebook data center in Los Lunas, New Mexico. While the Queen Creek deal was the company’s first sale off the Colorado River, it has also brokered a number of deals to supply groundwater to developing communities across Arizona. In September, the state’s Democratic attorney general filed an amicus brief in support of the counties challenging the transfer. “Future transfers will be likely, if not inevitable,” Kris Mayes wrote, “given the need for water across Arizona.” Queen Creek is growing fast. Wide, tree-lined boulevards vine off into neat, master-planned communities named Harvest and Encanterra, featuring resort pools, lush golf courses and ornamental lakes. Beyond the sand-hued estates, which blend into the Sonoran landscapes, there is construction. Cranes clear ground, crews build wood frames through suburban cul-de-sacs in various states of completion. Queen Creek was the seventh-fastest growing city in the US, according to a Census Bureau report released last year. It, like many Arizona suburbs, has struggled to balance a development boom with a shrinking water supply. Last year, the state moved to limit new housing construction in the suburbs of Phoenix—one of the fastest-growing metro areas in the country—to avoid emptying region’s underground aquifers. Projecting a 4.86 million acre-foot shortfall in groundwater supplies over the next century, the state announced that all future housing developments in the desert would have to find some other source of water, by purchasing or importing their supply. Ambitious cities and developers have been left scrambling. The suburb of Buckeye, west of Phoenix, has considered building a desalination plant in the Mexican town of Puerto Peñasco and piping the treated water several hundred miles north to Arizona. Queen Creek’s water manager Paul Gardner said the town had been working for years to secure water for its future. In addition to piping water from the Colorado River, the city has also sought to import groundwater from the Harquahala valley, to the east of Cibola. It recently signed a $30 million deal with Harquahala Valley Landowners LLC, a company that represents farmers and investors with water rights, to syphon off 5,000 acre-feet of groundwater a year to feed its maze of gated communities and sprawling subdivisions. Meanwhile, in Cibola, Holly Irwin dreams of development too—though of a different sort. On the east bank of the Colorado, she recently oversaw the cleanup and restoration of a stretch of open space for residents and visitors. “Now we have trash cans, we have picnic tables,” Irwin said. “My goal is we’ll have campsites that stretch all the way down. And more electrical hookups for RVs.” In the summertime, she hopes, the river will be filled with boats and its shore with picnickers and campers. “We could attract more people, from all over.” Stewart, the shop owner, first came here as a “weekender” from San Diego, California. She was drawn to the region’s rugged beauty and rural familiarity. “This was a place to roam, to be with family.” In the decade since she and her family moved here, she has also seen the Colorado shrink, and its lush banks fade. “There’s been years when you could basically walk across the river,” she said. “That is what has scared a lot of people. We need the water here.”

This story was originally published by the Guardian and is reproduced here as part of the Climate Desk collaboration. One of the biggest battles over Colorado River water is being staged in one of the west’s smallest rural enclaves. Tucked into the bends of the lower Colorado River, Cibola, Arizona, is a community of about 200 people. Maybe 300, […]

This story was originally published by the Guardian and is reproduced here as part of the Climate Desk collaboration.

One of the biggest battles over Colorado River water is being staged in one of the west’s smallest rural enclaves.

Tucked into the bends of the lower Colorado River, Cibola, Arizona, is a community of about 200 people. Maybe 300, if you count the weekenders who come to boat and hunt. Dusty shrublands run into sleepy residential streets, which run into neat fields of cotton and alfalfa.

Nearly a decade ago, Greenstone Resource Partners LLC, a private company backed by global investors, bought almost 500 acres of agricultural land here in Cibola. In a first-of-its-kind deal, the company recently sold the water rights tied to the land to the town of Queen Creek, a suburb of Phoenix, for a $14 million gross profit. More than 2,000 acre-feet of water from the Colorado River that was once used to irrigate farmland is now flowing, through a canal system, to the taps of homes more than 200 miles away.

A Guardian investigation into the unprecedented water transfer, and how it took shape, reveals that Greenstone strategically purchased land and influence to advance the deal. The company was able to do so by exploiting the arcane water policies governing the Colorado River.

Experts expect that such transfers will become more common as thirsty towns across the west seek increasingly scarce water. The climate crisis and chronic overuse have sapped the Colorado River watershed, leaving cities and farmers alike to contend with shortages. Amid a deepening drought and declines in the river’s reservoirs, Greenstone and firms like it have been discreetly acquiring thousands of acres of farmland.

As US states negotiate how they will divide up the river’s dwindling supplies, officials challenging the Greenstone transfer in court fear it will open the floodgates to many more private water sales, allowing investors to profit from scarcity. The purchases have alarmed local residents, who worry that water speculators scavenging agricultural land for valuable water rights will leave rural communities like Cibola in the dust.

“Here we are in the middle of a drought and trying to preserve the Colorado River, and we’re allowing water to be transferred off of the river,” said Regina Cobb, a former Republican state representative who has tried to limit transfers. “And in the process, we’re picking winners and losers.”

In February, a federal judge ruled that the Cibola-Queen Creek transfer was done without proper environmental review, ordering the federal Bureau of Reclamation to complete a more thorough evaluation. The Department of Justice, which is representing the bureau in the legal proceeding, declined to comment on whether the bureau would be appealing the decision.

Meanwhile, Greenstone—which appears to be the first water brokerage firm to sell rights to the Colorado River—could help chart the course of how the resource can be bought and sold in the west.

Greenstone first arrived in Cibola a decade ago—though few here knew anything of the company at the time. Through a subsidiary called GSC Farm LLC, the company purchased 485 acres of land in the Cibola valley in 2013 and 2014, for about $9.8 million. Hardly anyone in town took notice.

“Why would we?” said Holly Irwin, a supervisor for La Paz county, which encompasses Cibola.

Initially, Greenstone leased that land back to farmers, who planted fields of alfalfa and rows of puffball cotton.

Then, in 2018, the company sold the water tied to that farmland to Queen Creek, a fast-growing sprawl of gated communities on the outskirts of Arizona’s capital. The city’s government agreed to pay the company $24 million for the annual entitlement to 2,033 acre-feet of Colorado River water.

In July of last year, amid continuing legal challenges and national scrutiny, that water was finally diverted. The alfalfa and cotton fields were fallowed—reduced to dry brush and cracked earth. Many in town were blindsided. “We were all just like: ‘What the heck?’” Irwin recalled.

GSC Farm, she realized, wasn’t really a farm at all—it was part of a water investment firm that had brokered water transfer deals all across the south-west.

GSC Farm is one of at least 25 subsidiaries and affiliates of Greenstone, registered in Arizona and other states. Business registration records, deeds, loan documents and tax records show that these companies share the same executives. To local residents, including elected officials such as Irwin, it was initially unclear that the business—which had been acquiring thousands of acres of farmland not only in Cibola but across Arizona—went by so many names.

Greenstone’s executives and lawyers did not respond to the Guardian’s questions about the company’s corporate structure, its business model, and how it initiated the Queen Creek deal.

Public records revealed that Greenstone’s financial backers include the global investment firm MassMutual and its subsidiary Barings, as well as public pension funds. At least one of its acquisitions appears to be financed by Rabo AgriFinance, a subsidiary of the Dutch multinational banking and financial services company Rabobank.

On its website, Greenstone describes itself as “a water company” and as “a developer and owner of reliable, sustainable water supplies,” Its CEO, Mike Schlehuber, previously worked for Vidler Water Company—another firm that essentially brokers water supply—as well as Summit Global Management, a company that invests in water suppliers and water rights.

Greenstone’s managing director and vice-president, Mike Malano—a former realtor based in Phoenix who remains “active in the Arizona development community,” per his company bio—got himself elected to the board of the Cibola valley irrigation and drainage district, a quasi-governmental organization that oversees the distribution of water for agriculture in the region.

Irwin was horrified. She felt that a company with ties to big banks and real estate developers, posing as a farm, had infiltrated her small town and sold off its most precious resource.

The deal won’t have an immediate impact on Cibola’s residents. It doesn’t affect the municipal water supply. But she worries that the transfer will be the first of many. And if more and more farms are fallowed to feed water to cities, what will become of rural towns along the river?

“It’ll be like Owens Valley,” she said, referring to the water grab that inspired the movie Chinatown. In the early 20th century, agents working for the city of Los Angeles, posing as farmers or ranchers, bought up land in the valley and diverted its water to fuel their metropolis, leaving behind a dustbowl.

By allowing the Greenstone deal to go through, “I’m afraid we’ve opened Pandora’s box,” she said.

The Colorado River, which stretches from the Rocky Mountains into Mexico, has declined by about 20% since the turn of the century, amid the most severe drought the west has seen in 1,200 years. In a painfully negotiated deal, Arizona, Nevada and California agreed to reduce the amount of water they draw from the river by 13% through 2026. Experts warned that even deeper cuts would be necessary in the coming decade, but states are currently deadlocked over a longer-term conservation plan.

“With ongoing shortages on the river, driven by climate change, Colorado River water is going to become very valuable,” said Rhett Larson, a professor of water law at Arizona State University. “Anyone who understands this dynamic thinks, ‘Well, if I could buy Colorado River water rights, that’s more valuable than owning oil in this country at this stage.’”

Though the price Queen Creek paid for the water was remarkable—amounting to more than $11,500 per acre-foot—lawyers and water experts in Arizona told the Guardian it would probably sell for even more today.

The process of selling and transferring the water, however, can be bureaucratic and complicated. In most cases, a company like Greenstone would have to first convince fellow landowners in their local irrigation district to allow the sale, and then secure approvals from the state department of water resources and the US Bureau of Reclamation, the federal agency that manages water in the west.

What Irwin and many of Cibola’s residents didn’t realize was that in their sleepy, riverside town, a select group of farmers and landowners had been working for years to facilitate such deals.

Irrigation districts, as the name suggests, are designed to distribute water for irrigation across the US west. These districts were formed in the 19th and 20th centuries as cooperatives, allowing farmers to pool resources to develop water infrastructure. In the Colorado River basin, the districts contract with the Bureau of Reclamation to deliver water flowing through federal infrastructure to farms and ranches.

Farmers tend to be possessive of their precious water, explained Susanna Eden of the University of Arizona Water Resources Research Center. Most irrigation districts are set up to keep water for farming—and to keep it within their jurisdictions.

But in the Cibola valley irrigation and drainage district (CVIDD), landowners seem to have anticipated the market potential of their water. “It has been said, and I think it has been demonstrated, that the Cibola valley irrigation and drainage district was set up by people who were investing in water, rather than pure agriculturalists,” said Eden.

In 1992, long before Greenstone arrived on the scene, CVIDD amended its contract with the Bureau of Reclamation to explicitly contemplate “water exchange, water lease, water transfer” or a change in the “type or place of use” of its water allotment.

The CVIDD board president, Michael Mullion, a farmer in Cibola who had been leasing land from GSC Farm in addition to tending his own land, vouched for the Greenstone’s water transfer at a 2019 hearing with the state’s department of water resources. In his testimony, Mullion talked about how his grandfather had come to the Cibola valley in 1949. “He brushed, cleared, leveled and built the canals for this particular ground,” he said. “But his dream was to actually sell this water.”

The district’s governing philosophy already aligned with Greenstone’s, but the company’s 500-acre purchase here allowed it to more directly influence the district’s policies. Irrigation district boards make key decisions about water in the district—and buying more land can buy more influence on the board. Landowners in the district are entitled to two votes for every acre they hold in board elections.

The district’s board of directors now includes the heads of prominent farming families in the area, including Mullion and his father, Bob, as well as Greenstone’s vice-president, Malano.

Over the years, CVIDD helped landowners, including Greenstone, gain more agency and direct control over their water rights. In most irrigation districts, the district contracts with the Bureau of Reclamation for the right to a lump sum of water, which it distributes to landowners and farmers.

However, a review of CVIDD’s contracts with the bureau revealed that between 2006 and 2014, the district began removing itself as the middleman—giving a few large landowners even more agency over how they use their water. Whereas in other irrigation districts, members would have to vote to approve a water transfer like the Greenstone deal, in the Cibola valley, some landowners can propose transfers as they please, subject to federal approval.

Amid growing public scrutiny of the Cibola-Queen Creek transfer, the CVIDD board in 2019 unanimously approved a resolution disputing the idea that water rights are reserved for local use, and supporting landowners’ right to change “the place of use and purpose of use” of their water.

“I believe they’ve been setting the stage for the Queen Creek transfer,” said Jamie Kelley, an attorney based in Bullhead City. “This was their long-term plan.”

Mullion and lawyers representing CVIDD did not respond to the Guardian’s questions about its founding principles. They also did not address critiques that their policies were set up to benefit landowners seeking to sell water rights.

Even now, after years of public debate and litigation, local residents remain baffled by the idea that water could be sold and syphoned away from them, for ever.

Down a dusty, two-lane road, just past the unassuming cream-colored building where the Cibola valley irrigation district is headquartered, a group gathered for an informal meeting with Holly Irwin last summer to discuss their grievances.

“Why is somebody coming from so far away to take water from here?” said Carol Stewart, who runs B&B convenience store—the only shop in town.

She hosted a handful of friends and neighbors, mostly retirees and recreators who had settled here decades ago. Everyone huddled into Stewart’s wood-paneled RV trailer, a respite from the searing heat, and shouted their questions over the buzz of the AC. What did the transfer mean? Would they have enough water to supply homes here?

“It’s all about the mighty dollar,” Irwin said. “It’s all about money, and how much they can come in and take advantage.”

This deal wouldn’t affect the town’s residential water supplies, Irwin explained. But it meant that more and more farmers might choose to sell out—the water that once irrigated Cibola’s fields could be diverted away. And as the Colorado River shrank, corporations were growing increasingly thirsty for rural supplies.

“Don’t we have water rights?” asked John Rosenfeld, who has lived in Cibola for 24 years. “I have a right to that water, because I’m paying for it.”

It wasn’t quite that simple, Irwin responded. Most of Cibola’s residents get their water from a municipal supply or from private wells. But some properties here come with water rights attached, sometimes dating back to before Arizona was a US state. In the 1800s and the decades following, miners and farmers could snatch water rights up and down the Colorado River simply by laying claim to the water and putting it to use for livestock or irrigating land. It didn’t matter to these settlers that some of that water and land was taken from Indigenous tribes that were here before them.

Those water rights were then passed down from generation to generation. They were formalized in agreements and interstate contracts that left some farming regions and tribes with the highest-priority water rights, while other rural and metropolitan areas received lower-priority rights. Such contracts assign water rights a “priority level” of one through six—priorities one through four represent rights for permanent water service, whereas priorities five and six represent the temporary rights to surplus supplies. The water rights Greenstone purchased in Cibola and sold to Queen Creek are fourth priority—permanently secured and prized.

Notably missing from the group at B&B were farmers. The Guardian tried to contact a number of farmers in the region, but other than Mullion, none were available for an interview. Not all agriculturalists are interested in selling their water—but the option may be increasingly appealing as the climate crisis and water shortages disrupt their ability to effectively farm. “It’s hard to know, but demands create pressure,” said Wade Noble, an attorney representing farmers with the Wellton-Mohawk irrigation and drainage district, north of Cibola. “The drought on the river has created very high pressure.”

Greenstone isn’t the only company coveting such water rights. Across the US west, private investors have been scouring rural communities in search of high-priority water rights. In Arizona, Greenstone and firms like it have acquired thousands of acres of irrigable land and their corresponding water rights.

In the Cibola valley, for example, Western Water LLC, another company that specializes in “the sale and transfer of water rights,” owns about 100 acres of land, along with its entitlement to a modest 620 acre-feet of water, public records from the Bureau of Reclamation and La Paz county showed.

Before the Bureau of Reclamation approved Greenstone’s water transfer to Queen Creek, an investigation by the Arizona Republic found that Greenstone and its competitors had acquired thousands of acres of irrigable land across Arizona, including in La Paz, Pinal, Maricopa, Mohave and Yuma counties. The newspaper’s reports were cited by local officials who argued that Greenstone’s water transfer to Queen Creek would be a harbinger of many more such deals, as water becomes increasingly scarce across the west.

A Guardian review of deeds and other public records found that in Yuma county, companies associated with Greenstone hold about 5,300 acres of farmland, much of it within the Wellton-Mohawk irrigation and drainage district. Taxes on those lands were paid by Sunstone Farms LLC, a Greenstone subsidiary that leases agricultural properties.

There, unlike in CVIDD, individual landowners cannot initiate water transfer agreements on their own. But because votes within Wellton-Mohawk are also weighted based on how much land someone owns, larger landowners could seek more influence on its board. County records indicate that a Greenstone-affiliated LLC is one of the largest landowners in the district.

Meanwhile to the north, in Mohave county, Greenstone’s competitor Water Asset Management holds more than 2,400 acres, and access to nearly 16,000 acre-feet of water, per public records from the county.

In 2022, La Paz along with Mohave and Yuma counties filed a lawsuit against the Bureau of Reclamation, challenging its claim that the deal would cause “no significant” environmental impact.

“We are arguing in our lawsuit that Reclamation did not analyze the precedent that this transfer set,” said John Lemaster, an attorney representing Mohave county. “The entire purpose of Greenstone is to develop and sell water resources. We know future transfers are likely.”

This year, a federal judge in Arizona sided with them, ruling that the Bureau of Reclamation’s environmental evaluation was “arbitrary and capricious” and ordering the agency to prepare a more thorough assessment. While it’s unclear how the agency will proceed, given that water is already flowing to Queen Creek, the outcome could define how future deals are made and who can lay claim to the Colorado River’s water.

Greenstone, meanwhilehas tried to play down the significance of the transfer. At a March 2022 committee hearing to discuss a bill introduced by Cobb, the former state representative who tried to limit water transfers, Malano balked at descriptions of his company as a hedge fund, describing Greenstone as “one of the largest farming operations in the state of Arizona,”

Indeed, Greenstone and its competitors, such as Water Asset Management, often lease their land to farmers. But Greenstone’s ultimate goal, per its website, “is to advance water transactions,” And it has been busy doing so.

In 2017, it helped secure the right to Rio Grande water for a Facebook data center in Los Lunas, New Mexico. While the Queen Creek deal was the company’s first sale off the Colorado River, it has also brokered a number of deals to supply groundwater to developing communities across Arizona.

In September, the state’s Democratic attorney general filed an amicus brief in support of the counties challenging the transfer. “Future transfers will be likely, if not inevitable,” Kris Mayes wrote, “given the need for water across Arizona.”

Queen Creek is growing fast.

Wide, tree-lined boulevards vine off into neat, master-planned communities named Harvest and Encanterra, featuring resort pools, lush golf courses and ornamental lakes. Beyond the sand-hued estates, which blend into the Sonoran landscapes, there is construction. Cranes clear ground, crews build wood frames through suburban cul-de-sacs in various states of completion.

Queen Creek was the seventh-fastest growing city in the US, according to a Census Bureau report released last year. It, like many Arizona suburbs, has struggled to balance a development boom with a shrinking water supply.

Last year, the state moved to limit new housing construction in the suburbs of Phoenix—one of the fastest-growing metro areas in the country—to avoid emptying region’s underground aquifers. Projecting a 4.86 million acre-foot shortfall in groundwater supplies over the next century, the state announced that all future housing developments in the desert would have to find some other source of water, by purchasing or importing their supply.

Ambitious cities and developers have been left scrambling. The suburb of Buckeye, west of Phoenix, has considered building a desalination plant in the Mexican town of Puerto Peñasco and piping the treated water several hundred miles north to Arizona.

Queen Creek’s water manager Paul Gardner said the town had been working for years to secure water for its future. In addition to piping water from the Colorado River, the city has also sought to import groundwater from the Harquahala valley, to the east of Cibola. It recently signed a $30 million deal with Harquahala Valley Landowners LLC, a company that represents farmers and investors with water rights, to syphon off 5,000 acre-feet of groundwater a year to feed its maze of gated communities and sprawling subdivisions.

Meanwhile, in Cibola, Holly Irwin dreams of development too—though of a different sort.

On the east bank of the Colorado, she recently oversaw the cleanup and restoration of a stretch of open space for residents and visitors. “Now we have trash cans, we have picnic tables,” Irwin said. “My goal is we’ll have campsites that stretch all the way down. And more electrical hookups for RVs.”

In the summertime, she hopes, the river will be filled with boats and its shore with picnickers and campers. “We could attract more people, from all over.”

Stewart, the shop owner, first came here as a “weekender” from San Diego, California. She was drawn to the region’s rugged beauty and rural familiarity. “This was a place to roam, to be with family.”

In the decade since she and her family moved here, she has also seen the Colorado shrink, and its lush banks fade. “There’s been years when you could basically walk across the river,” she said. “That is what has scared a lot of people. We need the water here.”

Read the full story here.
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Is there such a thing as a ‘problem shark’? Plan to catch repeat biters divides scientists

Some experts think a few sharks may be responsible for a disproportionate number of attacks. Should they be hunted down?First was the French tourist, killed while swimming off Saint-Martin in December 2020. The manager of a nearby water sports club raced out in a dinghy to help, only to find her lifeless body floating face down, a gaping wound where part of her right thigh should have been. Then, a month later, another victim. Several Caribbean islands away, a woman snorkelling off St Kitts and Nevis was badly bitten on her left leg by a shark. Fortunately, she survived.Soon after the fatal incident in December, Eric Clua, a marine biologist at the École Pratique des Hautes Études in Paris, got a phone call. Island nations often ask for his help after a shark bite, he says, “because I am actually presenting a new vision … I say, ‘You don’t have a problem with sharks, you have a problem with one shark.’” Continue reading...

First was the French tourist, killed while swimming off Saint-Martin in December 2020. The manager of a nearby water sports club raced out in a dinghy to help, only to find her lifeless body floating face down, a gaping wound where part of her right thigh should have been. Then, a month later, another victim. Several Caribbean islands away, a woman snorkelling off St Kitts and Nevis was badly bitten on her left leg by a shark. Fortunately, she survived.Soon after the fatal incident in December, Eric Clua, a marine biologist at the École Pratique des Hautes Études in Paris, got a phone call. Island nations often ask for his help after a shark bite, he says, “because I am actually presenting a new vision … I say, ‘You don’t have a problem with sharks, you have a problem with one shark.’”Human-shark conflicts are not solely the result of accidents or happenstance, Clua says. Instead, he says there are such things as problem sharks: bold individuals that may have learned, perhaps while still young, that humans are prey. It’s a controversial stance, but Clua thinks that if it’s true – and if he can identify and remove these problem sharks – it might dissuade authorities from taking even more extreme forms of retribution, including culls.A shark killed a man at Long Reef beach in Dee Why, Sydney, on 6 September, 2025. Photograph: Dean Lewins/AAPThough culls of sharks after human-shark conflict are becoming less common and are generally regarded by scientists as ineffective, they do still happen. One of the last big culls took place near Réunion, a French island in the Indian Ocean, between 2011 and 2013, resulting in the deaths of more than 500 sharks. Even that was not enough for some – four years later, a professional surfer called for daily shark culls near the island.And so, in the immediate aftermath of the French tourist’s death in Saint-Martin, when one of Clua’s contacts called to explain what had happened, he recalls telling them: “Just go there on the beach … I want swabbing of the wounds.”After that bite and the one that occurred a month later, medical professionals collected samples of mucus that the shark had left behind to send off for analysis, though it took weeks for the results to come back. But as Clua and colleagues describe in a study published last year, the DNA analysis confirmed that the same tiger shark was responsible for both incidents.Even before the DNA test was complete, however, analysis of the teeth marks left on the Saint-Martin victim, and of the tooth fragment collected from her leg, suggested the perpetrator was a tiger shark (Galeocerdo cuvier) roughly 3 metres (10ft) long. Armed with this knowledge, Clua and his colleagues set out to catch the killer.During January and February 2021, Clua and his team hauled 24 tiger sharks from the water off Saint-Martin and analysed a further 25 sharks that they caught either around St Barts or St Kitts and Nevis.Eric Clua and his colleagues took DNA samples from nearly 50 tiger sharks to try to find one that had bitten two women. Photograph: Courtesy of Eric CluaBecause both of the women who were bitten had lost a substantial amount of flesh, the scientists saw this as a chance to find the shark responsible. Each time they dragged a tiger shark out of the water they flipped it upside down, flooded its innards with water, and pressed firmly on its stomach to make it vomit. A shark is, generally, “a very easy puker”, Clua says. The team’s examinations turned up no evidence of human remains.Clua and his colleagues also took DNA samples from each of the tiger sharks, as well as from dead sharks landed by fishers in St Kitts and Nevis. None matched the DNA swabbed from the wounds suffered by the two women.But the team has not given up. Clua is now waiting for DNA analysis of mucus samples recovered from a third shark bite that happened off Saint-Martin in May 2024. If that matches samples from the earlier bites, Clua says, that would suggest it “might be possible” to catch the culprit shark in the future.For people who don’t want to risk interacting with sharks, I have great news – swimming pools existCatherine Macdonald, conservation biologistThat some specific sharks have developed a propensity for biting people is controversial among marine scientists, though Lucille Chapuis, a marine sensory ecologist at La Trobe University in Australia, is not entirely sure why. The concept of problem animals is well established on land, she says. Terrestrial land managers routinely contend with problem lions, tigers and bears. “Why not a fish?” asks Chapuis. “We know that fishes, including sharks, have amazing cognitive abilities.”Yet having gleaned a range of opinions on Clua’s ideas, some marine scientists rejected the concept of problem sharks outright.A tiger shark. Some scientists fear that merely talking about problem sharks could perpetuate the preconception of human-eating monsters. Photograph: Jeff Milisen/AlamyClua is aware that his approach is divisive: “I have many colleagues – experts – that are against the work I’m doing.”The biggest pushback is from scientists who say there is no concrete evidence for the idea that there are extra dangerous, human-biting sharks roaming the seas. Merely talking about problem sharks, they say, could perpetuate the idea that some sharks are hungry, human-eating monsters such as the beast from the wildly unscientific movie Jaws.Clua says the monster from Jaws and his definition of a problem shark are completely different. A problem shark is not savage or extreme; it’s just a shark that learned at some point that humans are among the things it might prey on. Environmental factors, as well as personality, might trigger or aggravate such behaviour.Besides the tiger shark that struck off Saint-Martin and St Kitts and Nevis, Clua’s 2024 study detailed the case of another tiger shark involved in multiple bites in Costa Rica. A third case focused on an oceanic whitetip shark in Egypt that killed a female swimmer by biting off her right leg. The same shark later attempted to bite the shoulder of one of Clua’s colleagues during a dive.Pilot fish follow an oceanic whitetip shark. A woman was killed when an oceanic whitetip bit off her right leg in Egypt. Photograph: Amar and Isabelle Guillen/Guillen Photo LLC/AlamyToby Daly-Engel, a shark expert at the Florida Institute of Technology, says the genetic analysis connecting the same tiger shark to two bite victims in the Caribbean is robust. However, she says such behaviour must be rare. “They’re just opportunistic. I mean, these things eat tyres.”Diego Biston Vaz, curator of fishes at the Natural History Museum in London, also praises Clua’s work, calling it “really forensic”. He, too, emphasises it should not be taken as an excuse to demonise sharks. “They’re not villains; they’re just trying to survive,” he says.Chapuis adds that the small number of animals involved in Clua’s recent studies mean the research does not prove problem sharks are real. Plus, while some sharks might learn to bite humans, she questions whether they would continue to do so long term. People tend to defend themselves well and, given there are only a few dozen unprovoked shark bites recorded around the world each year, she says there is no data to support the idea that even the boldest sharks benefit from biting people.Plus, Clua’s plan – to capture problem sharks and bring them to justice – is unrealistic, says David Shiffman, a marine conservation biologist based in Washington DC. Even if scientists can prove beyond doubt that a few specific sharks are responsible for a string of incidents – “which I do not believe he has done”, Shiffman adds – he thinks finding those sharks is not viable.Any resources used to track down problem sharks would be better spent on preventive measures such as lifeguards, who could spot sharks approaching a busy beach, says Catherine Macdonald, a conservation biologist at the University of Miami in Florida.While identifying and removing a problem shark is better than culling large numbers, she urges people to answer harder questions about coexisting with predators. “For people who don’t want to risk interacting with sharks, I have great news,” she says. “Swimming pools exist.”Identifying and removing a problem shark is often regarded as better than culling large numbers. Photograph: Humane Society International/AAPClua, for his part, intends to carry on. He’s working with colleagues on Saint-Martin to swab shark-bite injuries when they occur, and to track down potential problem sharks.Asked whether he has ever experienced a dangerous encounter with a large shark himself, Clua says that in 58 years of diving it has happened only once, while spear fishing off New Caledonia. Poised underwater, waiting for a fish to appear, he turned his head. “There was a bull shark coming [toward] my back,” he says.He got the feeling at that moment that he was about to become prey. But there was no violence. Clua looked at the bull shark as it turned and swam away.This story was originally published in bioGraphic, an independent magazine about nature and regeneration from the California Academy of Sciences.

Engineers Create Soft Robots That Can Literally Walk on Water

Scientists have developed HydroSpread, a novel technique for building soft robots on water, with wide-ranging possibilities in robotics, healthcare, and environmental monitoring. Picture a miniature robot, no larger than a leaf, gliding effortlessly across the surface of a pond, much like a water strider. In the future, machines of this scale could be deployed to [...]

The walking mechanism of the “water spider” robot HydroBuckler prototype shown here is driven by “leg” buckling. Credit: Baoxing Xu, UVA School of Engineering and Applied ScienceScientists have developed HydroSpread, a novel technique for building soft robots on water, with wide-ranging possibilities in robotics, healthcare, and environmental monitoring. Picture a miniature robot, no larger than a leaf, gliding effortlessly across the surface of a pond, much like a water strider. In the future, machines of this scale could be deployed to monitor pollution, gather water samples, or explore flooded zones too hazardous for people. At the University of Virginia’s School of Engineering and Applied Science, mechanical and aerospace engineering professor Baoxing Xu is working on a way to make such devices a reality. His team’s latest study, published in Science Advances, unveils HydroSpread, a fabrication method unlike any before it. The approach enables researchers to create soft, buoyant machines directly on water, a breakthrough with applications that could range from medical care to consumer electronics to environmental monitoring. Previously, producing the thin and flexible films essential for soft robotics required building them on solid surfaces such as glass. The fragile layers then had to be lifted off and placed onto water, a tricky procedure that frequently led to tearing and material loss. HydroSpread sidesteps this issue by letting liquid itself serve as the “workbench.” Droplets of liquid polymer could naturally spread into ultrathin, uniform sheets on the water’s surface. With a finely tuned laser, Xu’s team can then carve these sheets into complex patterns — circles, strips, even the UVA logo — with remarkable precision. From Films to Moving Machines Using this approach, the researchers built two insect-like prototypes: HydroFlexor, which paddles across the surface using fin-like motions. HydroBuckler, which “walks” forward with buckling legs, inspired by water striders. In the lab, the team powered these devices with an overhead infrared heater. As the films warmed, their layered structure bent or buckled, creating paddling or walking motions. By cycling the heat on and off, the devices could adjust their speed and even turn — proof that controlled, repeatable movement is possible. Future versions could be designed to respond to sunlight, magnetic fields, or tiny embedded heaters, opening the door to autonomous soft robots that can move and adapt on their own. “Fabricating the film directly on liquid gives us an unprecedented level of integration and precision,” Xu said. “Instead of building on a rigid surface and then transferring the device, we let the liquid do the work to provide a perfectly smooth platform, reducing failure at every step.” The potential reaches beyond soft robots. By making it easier to form delicate films without damaging them, HydroSpread could open new possibilities for creating wearable medical sensors, flexible electronics, and environmental monitors — tools that need to be thin, soft and durable in settings where traditional rigid materials don’t work. Reference: “Processing soft thin films on liquid surface for seamless creation of on-liquid walkable devices” by Ziyu Chen, Mengtian Yin and Baoxing Xu, 24 September 2025, Science Advances.DOI: 10.1126/sciadv.ady9840 Never miss a breakthrough: Join the SciTechDaily newsletter.

Whales are getting tangled in lines and ropes off the California coast in record numbers

A NOAA report shows that more whales were killed in US waters this year by entanglements than any prior year.

The number of whales getting tangled up in fishing nets, line, buoys and other miscellaneous rope off the coasts of the United States hit a record high in 2024, with California taking the ignominious lead.According to the National Oceanographic and Atmospheric Administration, there were 95 confirmed entangled whales in U.S. waters last year. Eighty-seven were live animals, while reports for eight came in after the animals had died.On average, 71 whales are reported entangled each year. There were 64 in 2023.More than 70% of the reports were from the coastal waters off California, Alaska, Hawaii and Massachusetts. California accounted for 25% in 2024, most in the San Francisco and Monterey bay areas.Humpback whales were hardest hit, accounting for 77 of the cases. Other whale species include North Pacific gray whales, the North Atlantic right whale, minke, sperm, fin and bowhead whales.Entanglements are just one of many threats facing whales worldwide. Earlier this year, 21 gray whales died in Bay Area waters, mostly after getting struck by ships. The animals are increasingly stressed from changes in food availability, shipping traffic, noise pollution, waste discharge, disease and plastic debris, and their ability to avoid and survive these impediments is diminishing. Since 2007, more than 920 humpback whales have been maimed or killed by long line ropes that commercial crabbers use to haul up cages from the sea floor. The report notes that about half the incidents are directly tied to commercial and recreational fishing lines. The remaining 49 also involved line and buoys but in circumstances that could not be traced back to a specific fishery. The report comes after years of government and conservation group efforts with the commercial fishing industry to increase awareness and encourage different fishing technologies — such as pop-up fishing gear, which uses a remote controlled pop-up balloon device to bring cages to the surface, rather than relying on lines.It also comes as funding for NOAA is threatened and Congress is considering draft legislation that would weaken the Marine Mammal Protection Act, one of the country’s foundational environmental laws, signed by President Nixon in 1972.“This report paints a clear picture: our current safeguards are not enough,” said Gib Brogan, campaign director for Oceana, an ocean advocacy group, in a statement. He said things are likely to get worse if NOAA’s funding is cut and the Marine Mammal Protection Act is eroded. “These findings underscore an urgent need for coordinated action,” said Kathi George, the Sausalito-based Marine Mammal Center’s director of cetacean conservation in a statement. “Together, we can apply the best available science to reduce the risk of entanglement, through strategies like supporting fisher-led initiatives, improving detection and response efforts, and enhancing reporting and data sharing.”

Portland State researchers hope project will reduce mega earthquake damage

The researchers are working on a soil treatment that focuses on activating microbes to reduce groundwater saturation levels – they believe it could become a cost-effective, long-lasting solution to reduce earthquake-caused liquefaction.

If and when a Cascadia Subduction Zone earthquake hits the Portland region, soil liquefaction could dramatically worsen the damage, leading buildings to tilt, roads to buckle and utility lines to rupture. Especially susceptible are sandy and silty soils – like those by the Willamette River where aging tanks store fuels including gasoline, diesel and biofuel. Intense shaking during an earthquake could cause those soils to behave more like a liquid than a solid, leading the tanks to crack, collapse, spill and explode. But Portland State University researchers say soil microbes could help prevent the destruction. The researchers are working on a soil treatment that focuses on activating microbes to reduce groundwater saturation levels – and they believe it could become a cost-effective, long-lasting solution to reduce earthquake risk in their own city and across the region. “We recognized that it would be an opportunity to test it in Portland to see if it could be applied in areas like the CEI Hub,” said Diane Moug, one of the lead researchers of the PSU microbial treatment study and an assistant professor of civil and environmental engineering at the school.The treatment is one of several new soil-based solutions being developed to prevent or reduce liquefaction – but, unlike traditional soil improvement methods, the microbe technique is based in nature and doesn’t entail invasive procedures such as injecting cement into the ground or repeatedly dropping large weights to compact the soil, said Ellen Rathje, a professor of geotechnical engineering at the University of Texas at Austin. “This area of research is a very hot topic right now,” said Rathje, who is also president of the Earthquake Engineering Research Institute, a nonprofit for experts working to reduce earthquake risks. “There’s promise in the bio-inspired techniques because there are very limited approaches you can use for sites that have already been developed. And they’re inspired by naturally occurring processes, so they’re certainly good from a sustainability perspective.”Dubbed microbially induced desaturation, the method being tested by PSU entails injecting the layers of soil that lie beneath the surface with a mixture containing calcium acetate and calcium nitrate. And then waiting. The mixture acts as a food source for naturally occurring soil microbes, stimulating their growth, said Arash Khosravifar, the co-leader of the PSU project and an associate professor of civil and environmental engineering at the school.The microbes produce large amounts of nitrogen gas and carbon dioxide – a chemical reaction called denitrification. Those nitrogen gas bubbles, in turn, fill the tiny spaces between soil particles, reducing the soil’s saturation and making it more resistant to liquefaction, Khosravifar said. In the event of an earthquake, the trapped gas bubbles act like shock absorbers, dampening water pressure buildup in the soil during intense shaking, he said. Scientists believe Oregon is overdue for the Big One, a mega earthquake that will occur just off the Oregon coast along the Cascadia Subduction Zone where the Juan de Fuca Plate pushes beneath the North American Plate – and its shaking will devastate Portland. The last major Cascadia Subduction Zone quake happened in 1700 and there’s about a 37% chance that one of 7.1 magnitude or larger will occur in the next 50 years, according to the Oregon Department of Emergency Management. The state and city of Portland have mapped liquefaction risks, finding they’re among the highest along the Columbia and Willamette rivers, including the Critical Energy Infrastructure Hub where hundreds of fuel-filled tanks sit atop a six-mile stretch of unstable soils. Three years ago, following years of research and community pressure over the earthquake-related risks of spills and explosions at the hub, the Legislature mandated that tank owners develop plans to reduce seismic risks. “The state set a very high standard of seismic resilience, but they don’t dictate how a facility has to reach that. Soil-based solutions could be one of many options for these companies,” said John Wasiutynski, sustainability director with Multnomah County, which in 2022 published a study showing a liquefaction-related spill at the Portland hub would be similar to the BP Deepwater Horizon oil spill disaster in the Gulf of Mexico, the country’s largest oil spill to date.Inspired by the study, Portland researchers learned about the microbial method from colleagues at Arizona State University. Other researchers have also launched similar field work, including in Japan and Italy. From lab to fieldLab tests, which use small soil samples and mechanical shakers to simulate earthquakes, have shown that stimulating the growth of microbes and reducing soil saturation even by a few percentage points can significantly reduce liquefaction, Portland researchers said. Khosravifar, Moug and their collaborators are now aiming to prove the method can eliminate liquefaction in the real world, where soil conditions and scale are more complex – as is stimulating earthquakes. Enter the T-Rex, a massive truck outfitted with a mobile shaker that makes artificial earthquakes. The truck, which Portland researchers borrowed from the University of Texas at Austin, got its name from a scene in “Jurassic Park” where the pounding steps of a Tyrannosaurus rex create ripples in a water glass. The T-Rex truck pounds the ground and causes it to shake. The T-rex, a field shaker truck borrowed from the University of Texas at Austin, produces a small earthquake by shaking the ground. In September 2025, Portland State University researchers simulated earthquakes in the field to see if their microbe-focused soil treatment method can prevent the soil liquefying during a mega earthquake.courtesy of Portland State UniversityIn 2019, researchers conducted initial field tests at two sites, one in Northeast Portland near the Columbia River and another in Northwest Portland near the energy hub on the Willamette. They successfully pumped the treatment into fine-grained silt soils at the sites and showed that it desaturated the soils, according to a paper published in 2022 in the Journal of Geotechnical and Geoenvironmental Engineering.They have monitored the Northeast Portland site for six years and have found the treatment is effective for up to five years, Khosravifar said. Throughout August, they retreated the soil at the site, applying the solution to the subsurface soil through a central injection well. Two weeks ago, they installed a giant screw into the ground. The T-rex sat on top of the screw and shook the pile vertically, transferring the shaking energy down into the soil. What they found: The T-rex generated an earthquake – but while mighty, it wasn’t strong enough in deeper soil, Khosravifar said. The researchers are now working on how to increase the shaking intensity, he said, up to a point where the shaking will at least partially liquify the untreated soil and researchers can see the impacts of the treatment in areas injected with the chemicals. “One of the things that remains to be answered is, how much can we really mitigate liquefaction risk? Are we completely eliminating that risk or is it partial?” Khosravifar said. Challenges, drawbacksThe treatment comes with some risks. While the chemicals are benign to humans – calcium nitrate is widely applied to crops as a fertilizer and calcium acetate is a food-grade material used as a preservative in foods and a binder in pharmaceutical pills – the denitrification process, if incomplete, can leave behind nitrates or intermediate compounds like nitrite, nitric oxide or nitrous oxide, Khosravifar said. Nitrous oxide is a potent greenhouse gas. And nitrates or its compounds can contaminate drinking water. Research has linked high nitrate consumption over long periods to cancers, miscarriages and thyroid issues. It is especially dangerous to infants who can develop “blue baby syndrome,” which can be fatal. The formation of gas bubbles in the soil also can reduce porosity and conductivity of soil, potentially affecting water flow. It’s why the soil treatment requires specialized instruments to closely monitor the chemical reaction and nitrate and nitrite levels in groundwater, Khosravifar said. Sensors are embedded in the soil down to 20 feet to give researchers an idea of how the nutrients are moving in soil and whether the chemical reaction is complete. If the method is widely adopted, contractors performing the treatment would be required to use such sensors for long-term monitoring, he said. Other methodsStill, the microbe stimulation method could be a better option when compared to other soil treatments, the researchers said. Some entail injecting bacteria into soil rather than working with existing ones. One of the methods often uses urea, which produces ammonia, a toxic chemical that can damage water quality and is hard to remove.A more established soil improvement approach, known as permeating grouting, calls for injecting microfine cement into the cracks and fissures in liquefaction-prone soils – but it’s emission-intensive, uses a lot of water and is a lot more expensive. Mechanical compaction, another widely used soil treatment method, involves physically packing the soil down tightly so it’s stronger and less likely to shift or collapse during an earthquake.Portland General Electric, for example, used a method that mixed cement into the soil to create stiff, strong columns underground across the Harborton Substation, a major electrical substation in Northwest Portland just west of the energy hub. The project was completed during a rebuild of the substation in 2020 to address soils prone to liquefaction and cost about $40 million, said PGE spokesperson Amber Weyers. The main challenge with such methods is that they require access to the soil. For soils with existing structures or buildings – such as those under the fuel-filled tanks at Critical Energy Infrastructure Hub by the Willamette – there is no good solution. In those cases, PSU’s microbially induced desaturation method may prove the only one feasible, the researchers said.It’s also about a quarter of the cost of many of the other liquefaction prevention solutions, Khosravifar said. For areas occupied by a fuel tank, for example, the nitrate treatment’s initial application would cost $170,000, including the cost of installing wells, he said. Though the chemicals would have to be reapplied every five years, subsequent applications would cost a fifth of the initial expense or about $34,000 every five years, Khosravifar said. Still, the soil treatment is unlikely to be used by homeowners, given that over time it would cost a lot more than the house itself, Khosravifar said. That’s still a fraction of the cost for permeating grouting, which can cost five times as much, or more than $600,000, he said. Moug and Khosravifar said they would like to collaborate with one of the fuel storage companies housed at the Portland energy hub to test and monitor another patch of soil – to better understand how soil and water behave at the hub itself. “We’re not ready to fully implement this solution yet, but it would be a logical next step to test it on site,” Moug said. If you purchase a product or register for an account through a link on our site, we may receive compensation. By using this site, you consent to our User Agreement and agree that your clicks, interactions, and personal information may be collected, recorded, and/or stored by us and social media and other third-party partners in accordance with our Privacy Policy.

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