Cookies help us run our site more efficiently.

By clicking “Accept”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. View our Privacy Policy for more information or to customize your cookie preferences.

Defending the Earth is deadly work. A new report illuminates how much.

News Feed
Wednesday, September 17, 2025

Since the 1990’s, Martin Egot has protected his tribe’s ancestral homelands near Nigeria’s Cross River National Park. Egot, who is Indigenous Ekuri, helped establish the Ekuri Initiative, an organization dedicated to protecting parts of the rainforest. In 2009, the Ekuri Initiative successfully pushed the Cross River government, a state in Nigeria, to put a moratorium on logging activity in community-controlled areas of the rainforest, and were able to enforce the logging ban by deploying eco-guards: Ekuri men who patrol the rainforest to deter developers and illegal loggers.  But in 2023, the Nigerian government lifted the moratorium to allow logging. Then, later that year, a local timber company arrived without proper permits. The Ekuri eco-guards confiscated the company’s logging equipment, but their actions caused army personnel to enter the village, firing their weapons. There were no reported injuries, but the violence all but ended the Ekuri Initiative as eco-guards are unable to compete with private and government security forces hired to protect logging companies moving into the area. “In Cross River, the forest is almost completely gone everywhere else,” said Egot. “What we still have is found around the communities. So there’s a whole lot of pressure.” The violence that Ekuri environment and land defenders face isn’t uncommon. This week, Global Witness, an organization that investigates environmental and human rights abuses, released a new report documenting 146 cases of homicides and kidnappings of environmental and land defenders in 2024 – an average of three people killed or disappeared every week. The report’s authors say attacks occurred after speaking out or taking action to defend their lands, with many opposing mining, logging, and other extractive industries.  One third of the collected incidents happened to Indigenous peoples, while Afro-descendants, people with ancestral ties to enslaved Africans, comprised two cases this year. Most Afro-descendants reside in South America, like Brazil, and are stewards of biodiverse land. Since the organization began tracking violence against land and environment defenders in 2012, there have been a total of 2,253 cases.  “All these years reporting on the realities of defenders across the world, highlight, to me, the disproportionate nature of the attacks that Indigenous peoples in particular, and Afro descendants, are having to suffer year in and year out,” said Laura Furones, the report’s author.  According to the study, Colombia is considered the deadliest country for land and environment defenders with the highest number of lethal attacks with 48 cases, a third of the total, global amount. However, 80 percent of kidnapping and murder cases occurred in Latin America. Global Witness attributes the high rates of lethal violence to countries with weak state presence that enable corruption and unbalanced legal systems making resource conflicts more deadly. In Asia, the Philippines saw the highest number of killings and disappearances with most violence linked to government bodies.  It’s estimated that around 54 percent of the world’s critical mineral deposits needed for green energy and AI needs – cobalt, lithium, nickel, and copper – are located on or near Indigenous lands, often driving violence. “Amid rampant resource use, escalating environmental pressure, and a rapidly closing window to limit [global] warming to 1.5C, [industries] are treating land and environmental defenders like they are a major inconvenience instead of canaries in a coal mine about to explode,” said Rachel Cox, a senior campaigner at Global Witness. In Nigeria, Egot says he hopes to restore the Ekuri Initiative, and find ways to introduce more jobs to the region, including as eco-guards, as a way to curb logging in his community’s homelands. “We are calling on international communities to continue to talk to our state, our government, because Nigeria signs to a whole lot of environmental treaties,” he said. “So these treaties that they sign into, do they actually respect these treaties? Do they follow up on these treaties? This story was originally published by Grist with the headline Defending the Earth is deadly work. A new report illuminates how much. on Sep 17, 2025.

Nearly 150 land and environment defenders were killed or disappeared last year, most for standing up to mining and logging.

Since the 1990’s, Martin Egot has protected his tribe’s ancestral homelands near Nigeria’s Cross River National Park. Egot, who is Indigenous Ekuri, helped establish the Ekuri Initiative, an organization dedicated to protecting parts of the rainforest.

In 2009, the Ekuri Initiative successfully pushed the Cross River government, a state in Nigeria, to put a moratorium on logging activity in community-controlled areas of the rainforest, and were able to enforce the logging ban by deploying eco-guards: Ekuri men who patrol the rainforest to deter developers and illegal loggers. 

But in 2023, the Nigerian government lifted the moratorium to allow logging. Then, later that year, a local timber company arrived without proper permits. The Ekuri eco-guards confiscated the company’s logging equipment, but their actions caused army personnel to enter the village, firing their weapons. There were no reported injuries, but the violence all but ended the Ekuri Initiative as eco-guards are unable to compete with private and government security forces hired to protect logging companies moving into the area.

“In Cross River, the forest is almost completely gone everywhere else,” said Egot. “What we still have is found around the communities. So there’s a whole lot of pressure.”

The violence that Ekuri environment and land defenders face isn’t uncommon. This week, Global Witness, an organization that investigates environmental and human rights abuses, released a new report documenting 146 cases of homicides and kidnappings of environmental and land defenders in 2024 – an average of three people killed or disappeared every week. The report’s authors say attacks occurred after speaking out or taking action to defend their lands, with many opposing mining, logging, and other extractive industries. 

One third of the collected incidents happened to Indigenous peoples, while Afro-descendants, people with ancestral ties to enslaved Africans, comprised two cases this year. Most Afro-descendants reside in South America, like Brazil, and are stewards of biodiverse land. Since the organization began tracking violence against land and environment defenders in 2012, there have been a total of 2,253 cases. 

“All these years reporting on the realities of defenders across the world, highlight, to me, the disproportionate nature of the attacks that Indigenous peoples in particular, and Afro descendants, are having to suffer year in and year out,” said Laura Furones, the report’s author. 

According to the study, Colombia is considered the deadliest country for land and environment defenders with the highest number of lethal attacks with 48 cases, a third of the total, global amount. However, 80 percent of kidnapping and murder cases occurred in Latin America. Global Witness attributes the high rates of lethal violence to countries with weak state presence that enable corruption and unbalanced legal systems making resource conflicts more deadly. In Asia, the Philippines saw the highest number of killings and disappearances with most violence linked to government bodies. 

It’s estimated that around 54 percent of the world’s critical mineral deposits needed for green energy and AI needs – cobalt, lithium, nickel, and copper – are located on or near Indigenous lands, often driving violence. “Amid rampant resource use, escalating environmental pressure, and a rapidly closing window to limit [global] warming to 1.5C, [industries] are treating land and environmental defenders like they are a major inconvenience instead of canaries in a coal mine about to explode,” said Rachel Cox, a senior campaigner at Global Witness.

In Nigeria, Egot says he hopes to restore the Ekuri Initiative, and find ways to introduce more jobs to the region, including as eco-guards, as a way to curb logging in his community’s homelands.

“We are calling on international communities to continue to talk to our state, our government, because Nigeria signs to a whole lot of environmental treaties,” he said. “So these treaties that they sign into, do they actually respect these treaties? Do they follow up on these treaties?

This story was originally published by Grist with the headline Defending the Earth is deadly work. A new report illuminates how much. on Sep 17, 2025.

Read the full story here.
Photos courtesy of

California’s plan to boost plug-in heat pumps and induction stoves

LED light bulbs and TVs. Front-loading washing machines. Energy-lean refrigerators. All were once nascent technologies that needed a push to become mainstream. Now, California is trying to add über-efficient plug-in heat pumps and battery-equipped induction stoves to that list. It’s a tall order; today these…

LED light bulbs and TVs. Front-loading washing machines. Energy-lean refrigerators. All were once nascent technologies that needed a push to become mainstream. It’s a tall order; today these innovative products cost thousands of dollars and aren’t widely available in stores, unlike their more polluting, less efficient counterparts that burn fossil fuels or use electric-resistance coils to generate heat. But late last month, the California Public Utilities Commission signed off on a plan to spend $115 million over the next six years to develop and drive demand for the fossil-fuel-free equipment — a first-of-its-kind investment for the state. These appliances, which plug into standard 120-volt wall outlets, don’t need professional installers or the expensive electrical upgrades sometimes required for conventional whole-home heat pumps or 240-volt induction stoves. That ease of installation makes them crucial tools in California’s quest to decarbonize its economy by 2045. “This is an incredible example of what it looks like to center [these] communities,” said Feby Boediarto, energy justice manager of the statewide grassroots coalition California Environmental Justice Alliance. ​“It’s extremely important to think about the long-term vision of electrification for all homes, especially those who’ve been heavily burdened by pollution. And these initiatives are stepping stones to that vision.” California’s initiatives, developed by the commission’s California Market Transformation Administrator (CalMTA) program, are multipronged. They take aim at the whole supply chain, from tech development to distribution to consumer education, said Lynette Curthoys, who leads CalMTA. The initial investment by the world’s fourth-largest economy is expected to deliver about $1 billion in benefits, including avoided electric and gas infrastructure costs, through 2045. One major goal is to bring the price tag of battery-powered induction stoves way down. Current products from startups Copper and Impulse start at about $6,000 and $7,000, respectively — far more than top-rated gas ranges, which customers can snag for less than $1,000. As for the heat-pump plan, an essential element will be encouraging manufacturers to develop products for the California market in particular. One quirk they have to deal with is that windows in the Golden State commonly slide open from side to side or by swinging outward. The most efficient window-unit heat pumps available on the market today, by contrast, are designed to fit windows that open up and down. To spark better-suited designs, the state intends to create competitions for manufacturers — a strategy that’s worked before. In 2021, the New York City Housing Authority, along with the New York Power Authority and the New York State Energy Research and Development Authority, issued the Clean Heat for All Challenge. The competition pushed manufacturers to produce a window heat pump that could handle the region’s chilly winters, with a promise to purchase 24,000 units for public housing. San Francisco-based startup Gradient and Guangdong, China-based manufacturer Midea made the requisite technological leaps for New York. The state later bumped up its heat-pump order to 30,000 units.

Staying on Costa Rica’s Best Beach: The awā Beachfront Hotel Experience in Punta Uva

Every traveler, no matter how many places they’ve visited, is always hoping to be surprised again — especially those returning to Costa Rica with a clearer, more refined sense of what they’re looking for. With two coastlines and countless remarkable beaches, finding one that truly stands out is not always easy. Yet Punta Uva, in […] The post Staying on Costa Rica’s Best Beach: The awā Beachfront Hotel Experience in Punta Uva appeared first on The Tico Times | Costa Rica News | Travel | Real Estate.

Every traveler, no matter how many places they’ve visited, is always hoping to be surprised again — especially those returning to Costa Rica with a clearer, more refined sense of what they’re looking for. With two coastlines and countless remarkable beaches, finding one that truly stands out is not always easy. Yet Punta Uva, in the Southern Caribbean, manages to do exactly that. Its calm, reef-protected waters and preserved natural setting have earned it international recognition, including a spot on The World’s 50 Best Beaches by worlds50beaches.com, where it ranks number 6 in Latin America and is celebrated as Costa Rica’s top beach. Much of Punta Uva’s appeal comes from the region’s conscious approach to development. The Southern Caribbean has embraced sustainability and community involvement for decades, prioritizing low-density tourism and environmental stewardship over rapid expansion. This long-term commitment is one of the reasons why Punta Uva Costa Rica has become an emblem of the quiet, nature-centered experiences so many travelers look for today. On this protected stretch of coastline sits awā Beachfront Hotel Punta Uva, offering one of the most direct and refined ways to experience the best beach in Costa Rica. As the only hotel with a dedicated beachfront club positioned directly on the shoreline, awā gives guests immediate access to Punta Uva while maintaining a peaceful, private atmosphere within its grounds. For travelers considering where to stay in Punta Uva, awā offers a rare blend of comfort, design, and closeness to nature. At the heart of this vision is the hotel’s guiding philosophy — Crafted by Nature — a concept that reflects a deeper intention behind every detail. Rather than dominating the landscape, each element is shaped to echo it. From the use of local materials to the flow of open-air spaces, awā is designed to let nature lead. The result is a hotel experience that feels intuitive, grounded, and organically connected to its surroundings. This sense of intentional simplicity carries into the hotel’s spaces as well. Designed as an adults-only boutique retreat, awā features 11 suites shaped around calm, privacy, and connection to the environment. The aesthetic is understated and refined, using natural tones, soft lines, and local materials that echo the surrounding landscape. Ocean-view suites frame the Caribbean Sea, garden-view spaces immerse guests in greenery, and select suites include private pools or bathtubs—ideal options for travelers seeking a deeper sense of relaxation. This integration between design, comfort, and the surrounding landscape is what ultimately defines the experience at awā. The suites offer guests a distinct perspective of Punta Uva, creating a connection to the environment that feels both intimate and elevated—a warm, carefully considered contrast to the more traditional stays found in the region. Its privileged beachfront setting provides uninterrupted views of Punta Uva’s unspoiled coastline — the sea, the forest canopy, and the soft shifts in light from sunrise to afternoon. Rather than imposing itself on nature, awā uses well-crafted design and subtle details to keep the landscape at the center of the experience. The result is a grounded, meaningful form of comfort that resonates with travelers who see the environment as the true highlight of their visit. At the same time, awā offers easy access to the wider Southern Caribbean for travelers who want to explore beyond the beach. Playa Chiquita, Cocles, and Manzanillo are all nearby, each offering its own character. Guests can snorkel, kayak, paddleboard, walk through forest trails, or enjoy the cultural and culinary energy of nearby Puerto Viejo. Whether travelers want activity or stillness, the hotel’s location provides flexibility without sacrificing tranquility. Ultimately, awā Beachfront Hotel Punta Uva provides a stay anchored in one of Costa Rica’s most extraordinary natural settings — preserved through careful development and shaped by the quiet rhythm of the Caribbean. For visitors hoping to rediscover the region or experience it from a more intimate perspective, awā delivers a meaningful, beautifully integrated place to stay. In a country known for its exceptional coastlines, Punta Uva stands apart. And staying at awā Beachfront Hotel Punta Uva offers travelers the rare chance not just to visit Costa Rica’s best beach, but to experience it fully — from the first light of the morning to the last colors of the day. The post Staying on Costa Rica’s Best Beach: The awā Beachfront Hotel Experience in Punta Uva appeared first on The Tico Times | Costa Rica News | Travel | Real Estate.

Private equity firm to buy Zenith Energy, Portland’s controversial fuel terminal

Miami-based I Squared Capital, specializing in global infrastructure investments, said it plans to complete the transition from fossil fuel storage to renewable fuels by October 2027.

A Miami-based private equity firm announced Tuesday that it’s set to acquire the Zenith Energy fuel terminal on the Willamette River in Northwest Portland. I Squared Capital, specializing in global infrastructure investments, has entered into a legally binding contract to purchase 100% of the Portland terminal, the company announced.I Squared manages $50 billion in assets in over 70 countries, including natural gas companies, solar, wind and battery storage facilities and fiber-optic networks.Company officials did not say how much the firm plans to pay for the Portland terminal. Both I Squared and Zenith are privately held, so neither company must disclose the transaction’s financial terms to the U.S. Securities and Exchange Commission. The transaction is expected to close within the next few months.I Squared said it will abide by the terminal’s current obligations, including the transition from crude oil and other fossil fuel storage to renewable fuels by October 2027 – in line with Zenith’s pledge to the city and state regulators. Renewable fuels include biodiesel, renewable diesel and sustainable aviation fuel. “We see significant opportunity for the Portland facility,” Gautam Bhandari, the firm’s global chief investment officer and managing partner, said in a press release. “We believe the terminal is uniquely positioned to become one of the West Coast’s leading renewable fuel hubs, supported by strong structural demand for low-carbon fuels and a broad shift toward sustainable transportation solutions.”The firm also said the terminal is “essential to helping Portland and the State of Oregon meet their clean fuel policy goals,” echoing statements made in recent months by Zenith officials. In recent years, Portland has adopted a policy to transition to renewable fuels, also known as biofuels, to reach greenhouse gas emission reduction mandates and improve air quality. City officials have said they are still committed to electrification of cars and trucks but it will take decades. Zenith’s acquisition comes in the wake of a major regulatory win for the fuel terminal, which stores fuels and loads them onto barges, trucks and rail cars. In October, Oregon’s Department of Environmental Quality approved Zenith’s new air quality permit, securing its continued operations on the river. Under the permit, Zenith is required to fully transition to renewables within two years. The approval came despite years of fierce opposition from environmental groups and some residents worried about Zenith’s history of violations and the earthquake-related safety risks at the Critical Energy Infrastructure Hub, where Zenith is one of 11 companies with fuel terminals and the only one still storing crude oil. The Houston-based Zenith purchased the Portland terminal – a former asphalt refinery – in 2017 from Arc Logistics. Within a few months, long trains from Canada and North Dakota began bringing large amounts of tar sands oil to store at the terminal, surprising regulators and incensing local activists. Zenith has been shifting from crude oil to renewable fuels in recent years. By the end of 2024, the company reported that 66% of its contracted storage capacity was dedicated to renewable fuels. A previous analysis by The Oregonian found that Zenith’s new air quality permit is likely to pave the way for the company to significantly expand the amount of liquid fuel it stores at the Portland terminal because renewable fuels produce less pollution, allowing the company to store more of them without going over the permit limits. DEQ’s spokesperson Michael Loch said a change in ownership does not change the requirements of the air quality permit. “The permit applies to the facility and its operations, and any new owner would be responsible for complying with all permit conditions,” Loch said.A permit modification may be required if the new owner proposes changes to operations or the facility name, said Loch, but the DEQ has not received any such requests at this time. It’s likely the terminal’s name will change because Zenith Energy will continue to own other terminals across the U.S. Opponents said they will continue to oppose the terminal and its expansion. “No matter who owns this facility, Portlanders will continue to fight the expansion of dangerous liquid fuel storage on this site,” said Nick Caleb, an attorney with the Breach Collective, a statewide climate justice advocacy organization that has opposed Zenith for years.At the collective’s urging, Portland is still investigating whether Zenith violated its franchise agreement by installing and using new pipes at an additional dock without reporting it. City officials expect to conclude the investigation by year’s end. Environmental groups also have challenged the city’s land-use approval for Zenith before the Oregon Land Use Board of Appeals. In November, the Oregon Court of Appeals reversed the board’s initial decision concerning Portland’s Zenith approval, sending the case back to the board for a full review.

Biomass is a money pit that won’t solve California’s energy or wildfire problems

Utilities customers help pay for biomass because electric utilities buy its products to produce electricity, paying four times more. Is it worth it?

Guest Commentary written by Shaye Wolf Shaye Wolf is the climate science director at the Center for Biological Diversity. California’s most expensive electricity source is finally poised to lose a government handout that props up its high costs and harmful pollution. In an era of clean, cheap solar and wind energy, policymakers are rightly beginning to treat biomass energy like the boondoggle it is.  Biomass energy — electricity made by burning or gasifying trees — is an expensive, dirty relic that relies on industry misinformation and taxpayer money.  In a vote later this month, the California Public Utilities Commission is expected to end the BioMAT subsidy program, which requires electric utilities to buy biomass power at exorbitant costs — four times the average. Californians get hit with those extra costs in our power bills, along with pollution that harms our health and climate.  Utilities and environmental groups support ending this costly subsidy.  But the biomass industry is fighting back with misleading claims that its projects are made clean by “new” technology or that they’re needed for wildfire safety. Don’t be fooled. Burning trees to make electricity harms the climate. In fact, biomass power is more climate-polluting at the smokestack than coal. Biomass energy releases toxic air pollutants that endanger health, increasing the risk of premature death and illnesses like asthma. The facilities often are located in low-income communities and communities of color that have long fought to shut them down.   It is telling that the biomass industry is rebranding. It claims it will use “clean” methods to gasify trees instead of burning them. But gasification — which also involves heating organic material — releases large amounts of climate-harming air pollution.  State regulators in May denied a costly biomass gasification project that couldn’t show it would reduce emissions as promised.   The industry also promotes carbon capture and storage, claiming this technology will suck up carbon dioxide from biomass smokestacks and store it underground forever. But carbon capture and storage is a costly, decades-old technology with a long history of failure and serious health and safety risks. Finally, the industry claims biomass energy projects will help pay for forest thinning, which it says will protect communities during wildfires. That means cutting trees, often large trees, which threatens wildlife and destroys forests, which naturally store carbon and fight climate change. Thinning isn’t a good way to keep communities safe. Most of the community destruction is caused by wind-driven fires during extreme fire weather, made worse by climate change. The fastest-moving 3% of wind-driven fires is responsible for 88% of the damage to homes.  No amount of forest thinning can stop that. In fact, thinning makes cool, moist forests hotter, drier and more wind-prone, which can make fires burn faster and more intensely. Most of California’s destructive wildfires — like the Los Angeles area fires in January — have burned in shrublands and grasslands, not forests, making thinning irrelevant in those cases. A better way to prevent fires Instead, the best investment for protecting communities during wildfires is hardening homes, so they’re less likely to catch fire, and stopping new development in fire-prone areas. Yet the state has earmarked only 1% of its wildfire funding for home hardening. Most goes to thinning.  Where thinning occurs, it’s most cost-effective to scatter the wood in the forest to create wildlife habitat, retain vital nutrients, and enhance natural carbon storage. If wood must be removed, it can be turned into mulch and shavings. The worst choice is subsidizing biomass companies to make dirty energy. Any way you look at it, biomass energy is a polluting money pit that won’t solve our climate or wildfire safety problems. California already has the affordable solutions we need: Clean, cheap solar and wind energy and energy storage to power our state, and home hardening to protect communities from wildfire while growing local economies.  California’s leaders need to embrace these proven solutions and get us out of the expensive, dangerous biomass business.

Working to eliminate barriers to adopting nuclear energy

Nuclear waste continues to be a bottleneck in the widespread use of nuclear energy, so doctoral student Dauren Sarsenbayev is developing models to address the problem.

What if there were a way to solve one of the most significant obstacles to the use of nuclear energy — the disposal of high-level nuclear waste (HLW)? Dauren Sarsenbayev, a third-year doctoral student at the MIT Department of Nuclear Science and Engineering (NSE), is addressing the challenge as part of his research.Sarsenbayev focuses on one of the primary problems related to HLW: decay heat released by radioactive waste. The basic premise of his solution is to extract the heat from spent fuel, which simultaneously takes care of two objectives: gaining more energy from an existing carbon-free resource while decreasing the challenges associated with storage and handling of HLW. “The value of carbon-free energy continues to rise each year, and we want to extract as much of it as possible,” Sarsenbayev explains.While the safe management and disposal of HLW has seen significant progress, there can be more creative ways to manage or take advantage of the waste. Such a move would be especially important for the public’s acceptance of nuclear energy. “We’re reframing the problem of nuclear waste, transforming it from a liability to an energy source,” Sarsenbayev says.The nuances of nuclearSarsenbayev had to do a bit of reframing himself in how he perceived nuclear energy. Growing up in Almaty, the largest city in Kazakhstan, the collective trauma of Soviet nuclear testing loomed large over the public consciousness. Not only does the country, once a part of the Soviet Union, carry the scars of nuclear weapon testing, Kazakhstan is the world’s largest producer of uranium. It’s hard to escape the collective psyche of such a legacy.At the same time, Sarsenbayev saw his native Almaty choking under heavy smog every winter, due to the burning of fossil fuels for heat. Determined to do his part to accelerate the process of decarbonization, Sarsenbayev gravitated to undergraduate studies in environmental engineering at Kazakh-German University. It was during this time that Sarsenbayev realized practically every energy source, even the promising renewable ones, came with challenges, and decided nuclear was the way to go for its reliable, low-carbon power. “I was exposed to air pollution from childhood; the horizon would be just black. The biggest incentive for me with nuclear power was that as long as we did it properly, people could breathe cleaner air,” Sarsenbayev says.Studying transport of radionuclidesPart of “doing nuclear properly” involves studying — and reliably predicting — the long-term behavior of radionuclides in geological repositories.Sarsenbayev discovered an interest in studying nuclear waste management during an internship at Lawrence Berkeley National Laboratory as a junior undergraduate student.While at Berkeley, Sarsenbayev focused on modeling the transport of radionuclides from the nuclear waste repository’s barrier system to the surrounding host rock. He discovered how to use the tools of the trade to predict long-term behavior. “As an undergrad, I was really fascinated by how far in the future something could be predicted. It’s kind of like foreseeing what future generations will encounter,” Sarsenbayev says.The timing of the Berkeley internship was fortuitous. It was at the laboratory that he worked with Haruko Murakami Wainwright, who was herself getting started at MIT NSE. (Wainwright is the Mitsui Career Development Professor in Contemporary Technology, and an assistant professor of NSE and of civil and environmental engineering).Looking to pursue graduate studies in the field of nuclear waste management, Sarsenbayev followed Wainwright to MIT, where he has further researched the modeling of radionuclide transport. He is the first author on a paper that details mechanisms to increase the robustness of models describing the transport of radionuclides. The work captures the complexity of interactions between engineered barrier components, including cement-based materials and clay barriers, the typical medium proposed for the storage and disposal of spent nuclear fuel.Sarsenbayev is pleased with the results of the model’s prediction, which closely mirrors experiments conducted at the Mont Terri research site in Switzerland, famous for studies in the interactions between cement and clay. “I was fortunate to work with Doctor Carl Steefel and Professor Christophe Tournassat, leading experts in computational geochemistry,” he says.Real-life transport mechanisms involve many physical and chemical processes, the complexities of which increase the size of the computational model dramatically. Reactive transport modeling — which combines the simulation of fluid flow, chemical reactions, and the transport of substances through subsurface media — has evolved significantly over the past few decades. However, running accurate simulations comes with trade-offs: The software can require days to weeks of computing time on high-performance clusters running in parallel.To arrive at results faster by saving on computing time, Sarsenbayev is developing a framework that integrates AI-based “surrogate models,” which train on simulated data and approximate the physical systems. The AI algorithms make predictions of radionuclide behavior faster and less computationally intensive than the traditional equivalent.Doctoral research focusSarsenbayev is using his modeling expertise in his primary doctoral work as well — in evaluating the potential of spent nuclear fuel as an anthropogenic geothermal energy source. “In fact, geothermal heat is largely due to the natural decay of radioisotopes in Earth’s crust, so using decay heat from spent fuel is conceptually similar,” he says. A canister of nuclear waste can generate, under conservative assumptions, the energy equivalent of 1,000 square meters (a little under a quarter of an acre) of solar panels.Because the potential for heat from a canister is significant — a typical one (depending on how long it was cooled in the spent fuel pool) has a temperature of around 150 degrees Celsius — but not enormous, extracting heat from this source makes use of a process called a binary cycle system. In such a system, heat is extracted indirectly: the canister warms a closed water loop, which in turn transfers that heat to a secondary low-boiling-point fluid that powers the turbine.Sarsenbayev’s work develops a conceptual model of a binary-cycle geothermal system powered by heat from high-level radioactive waste. Early modeling results have been published and look promising. While the potential for such energy extraction is at the proof-of-concept stage in modeling, Sarsenbayev is hopeful that it will find success when translated to practice. “Converting a liability into an energy source is what we want, and this solution delivers,” he says.Despite work being all-consuming — “I’m almost obsessed with and love my work” — Sarsenbayev finds time to write reflective poetry in both Kazakh, his native language, and Russian, which he learned growing up. He’s also enamored by astrophotography, taking pictures of celestial bodies. Finding the right night sky can be a challenge, but the canyons near his home in Almaty are an especially good fit. He goes on photography sessions whenever he visits home for the holidays, and his love for Almaty shines through. “Almaty means 'the place where apples originated.' This part of Central Asia is very beautiful; although we have environmental pollution, this is a place with a rich history,” Sarsenbayev says.Sarsenbayev is especially keen on finding ways to communicate both the arts and sciences to future generations. “Obviously, you have to be technically rigorous and get the modeling right, but you also have to understand and convey the broader picture of why you’re doing the work, what the end goal is,” he says. Through that lens, the impact of Sarsenbayev’s doctoral work is significant. The end goal? Removing the bottleneck for nuclear energy adoption by producing carbon-free power and ensuring the safe disposal of radioactive waste.

Suggested Viewing

Join us to forge
a sustainable future

Our team is always growing.
Become a partner, volunteer, sponsor, or intern today.
Let us know how you would like to get involved!

CONTACT US

sign up for our mailing list to stay informed on the latest films and environmental headlines.

Subscribers receive a free day pass for streaming Cinema Verde.
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.