
A federal trial in San Francisco has brought US tire manufacturers, fishing groups, and environmental scientists into court over a chemical most drivers have never heard of — but which scientists say may be silently reshaping aquatic ecosystems. The case centers on 6PPD, a chemical antioxidant used in nearly all vehicle tires to prevent cracking and extend tire life. When 6PPD on tire treads reacts with ground-level ozone on the road, it transforms into 6PPD-quinone (6PPD-Q), a compound now at the center of a major environmental and legal dispute.
The lawsuit was filed by American fishing organizations, including the Institute for Fisheries Resources (IFR) and the Pacific Coast Federation of Fishermen’s Associations (PCFFA), represented by Earthjustice. Earthjustice is a nonprofit environmental law firm founded in 1971.
The plaintiffs argue that continued use of 6PPD in tires violates the US Endangered Species Act (ESA) because its byproduct, 6PPD-Q, harms protected salmon and steelhead populations. 6PPD-Q is added to tire rubber to prevent cracking and degradation of rubber caused by ozone and oxygen in the air. But fishermen are sure this material is causing toxicity and salmon die-off.
“Fishing families up and down the West Coast of the United States depend on the health of salmon populations for their livelihoods,” said Glen Spain, General Legal Counsel for IFR and PCFFA. “Whether or not this should continue will be up to the Court.”
The defendants are US tire manufacturers, represented collectively by industry counsel. Common US tire makers include Bridgestone, Goodyear, and Michelin and Pirelli.
What the Scientists Testified about 6PPD-Q

The court heard from multiple academic researchers whose work focuses on toxicology, hydrology, and fisheries biology.
Edward Kolodziej, an environmental chemist and award-winning researcher at the University of Washington, first identified 6PPD-Q in 2021, and testified that the compound is the primary cause of decades-long episodes of mass coho salmon mortality linked to stormwater runoff. His testimony described how cities like Seattle invested millions in creek restoration only to see the salmon continue dying — prompting research that ultimately traced the deaths back to tire-derived chemicals.
Kolodziej emphasized that his findings have since been replicated across regions and methodologies, which he said strengthens the scientific consensus around 6PPD-Q’s toxicity. He also said the tire industry knew about his research.
According to Mavensnotebook, Kolodziej said his team was contacted in 2018 after witnesses documented female coho salmon dying in urban streams before reproducing. His team identified a mortality signature for the chemicals that were present in the water when the fish perished, identifying the majority of the chemicals as derivatives from tire rubber. A 2021 study published by his team concluded that 6PPD-quinone was the primary toxic chemical in Urban Runoff Mortality Syndrome.
“It opened up our eyes that there are a lot of abundant tire rubber chemicals we knew little about,” he said. “Learning more and more about tires could explain this case of mortality.”
John Stark, a Professor of Ecotoxicology at Washington State University, testified that 6PPD-Q is toxic to coho, Chinook, and steelhead at concentrations likely to occur in real-world habitats. He told the court that, in his research career, he has not encountered a chemical as toxic as 6PPD-Q. According to Stark, fish exposed to the compound did not recover even when returned to clean water. We wonder what happens when people eat fish that have ingested 6PPD-Q.
Stark’s peer-reviewed paper, admitted into evidence, shows significant mortality occurring below current EPA safety benchmarks.
Dr. Robert Lusardi, a conservation biologist at UC Davis, testified that salmon and steelhead are present in the freshwater habitats of the 24 ESA-protected species named in the case throughout the year. When asked directly by the judge whether 6PPD-Q was a “silent killer,” Lusardi responded that it was.

How the chemical reaches salmon
As tires roll on roads, they wear down from friction. This creates tiny particles called tire wear particles (a mix of rubber, fillers, and additives) which includes 6PPD-Q.
On the issue of exposure pathways, Derek B. Booth, a geologist and hydrologist specializing in stormwater, testified that roads generate runoff that transports contaminants — including 6PPD-Q — into streams and rivers. Booth told the court that existing stormwater treatment systems are not sufficient to prevent the chemical from reaching aquatic habitats.
He stated that after reviewing extensive peer-reviewed data and walking thousands of waterways, there is “no reasonable way” that 6PPD-Q is not entering fish habitats. Supporting this, Maureen Goff, M.Sc., a GIS mapping expert, presented maps showing extensive overlap between roadways and critical habitats for ESA-protected species.
Tire makers offer a defense with paid scientists
The tire industry’s witnesses focused on uncertainty, feasibility, and safety tradeoffs.
Corissa Lee, called as a tire expert, testified that she could not estimate how long a tire made without 6PPD would last or whether it would meet federal motor vehicle safety standards. She acknowledged that alternative chemicals under review by the US Tire Manufacturers Association present unresolved technical or toxicity concerns.
She also testified that she was aware that Flexsys, the largest US manufacturer of 6PPD, announced in November that it had developed a viable alternative — but said she did not consider that alternative when concluding that 6PPD is uniquely effective.
Other defense witnesses, including William Goodfellow and Tiffany Thomas, testified despite having no direct laboratory or field research on 6PPD-Q itself. Court testimony noted that Thomas was paid $450,000 for her work in the case and had not conducted independent studies on the chemical. She is a principal scientist at science consulting firm Exponent, and she was reported to have testified at the trial that 6PPD-quinone is quick to degrade and has the opportunity to react with different chemicals and undergo many physical actions between the road surface and surface water.
“Without understanding all these factors, the ability to predict is speculation,” she said, adding that Kolodziej acknowledged the factors, but did not weigh them in his opinions.
All three defense witnesses were paid and are affiliated with Exponent, a consulting firm long used by industry in environmental and health litigation. Exponent has previously faced public criticism over the objectivity of its research, including in a 2010 Los Angeles Times investigation when Toyota called in the “paid scientists”
Toyota’s 2010 investigation was on unintended acceleration, and they covered cases involving secondhand smoke, asbestos exposure, and toxic waste contamination. The LA Times investigation reported that many companies facing environmental or public-health litigation turned to Exponent for expert analysis and courtroom defense. While Exponent employs credentialed scientists and engineers, the firm’s work has drawn criticism from some academics and public-interest advocates who question the independence of industry-funded research.
One of the trial’s most notable moments came when the judge asked whether there was any dispute that tire manufacturers knew tires shed 6PPD-Q and that it could run off into waterways. Defense counsel confirmed there was no dispute on that point.
The trial has concluded, and the judge is expected to issue a decision in the coming months. At issue is not only the future of a common tire additive, but how courts weigh emerging chemical science against industrial safety standards and endangered species protections. If there are no proven and safe alternatives, what can tire manufacturers do? Can we treat or spray our tires with a material that will stop the shed of micro-particles? Should tire manufacturers heed the call and offer millions in CEO compensation and executive bonuses to mitigate risks to wildlife, rivers and human health? Note that 4 of the biggest tire companies are from Japan?
According to Simply Wall Street Mark W. Stewart from Goodyear is making about $25 million USD a year on tires in 2024. He is credited for turning the company around from a loss.
| Company (by market cap) | CEO | Market Cap (USD, approx.) | Estimated Total CEO Pay (USD) | Estimated Bonus / Incentives (USD) |
|---|---|---|---|---|
| Bridgestone | Shuichi Ishibashi | $28+ billion | $1.5M–$3M | $300K–$1M |
| Michelin | Florent Menegaux | $26+ billion | $2M–$4M | $500K–$1.5M |
| Continental | Nikolai Setzer | $15+ billion | $2.5M–$5M | $800K–$2M |
| Pirelli | Andrea Casaluci | $7–8 billion | $1.5M–$3M | $400K–$1M |
| Yokohama Rubber | Masataka Yamaishi | $6+ billion | $1.5M–$3M | $300K–$900K |
| Hankook Tire | Cho Hyun-beom | $5+ billion | $2M–$4M | $700K–$1.5M |
| Sumitomo / Dunlop | Satoru Yamamoto | $4+ billion | $1M–$2M | $200K–$600K |
| Toyo Tires | Takashi Shimizu | $4+ billion | $1M–$2.5M | $300K–$800K |
| Goodyear | Mark W. Stewart | $2.5–3 billion | $25–26M (actual) | $18M+ (signing + incentives) |
| Cooper Tire (now Goodyear) | — | — | — | — |
“As expert testimony and the evidence have made clear this week: 6PPD-Q is devastating to vulnerable salmon populations, yet 6PPD continues to be used by U.S. tire manufacturers,” said Perry Wheeler, spokesperson for Earthjustice, in a statement following the trial’s conclusion.







































































































































































































































The arrival of Neoliner Origin to the port in Baltimore represents more than technological novelty—it suggests a new direction for global trade. Wind propulsion, once displaced by diesel engines, is re-emerging as one of the only scalable, immediately deployable solutions capable of drastically reducing emissions while improving safety.














































































































































































































































































































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In the black depths of the northwest Pacific Ocean, between 6,000 and 9,500 metres beneath the surface, scientists have discovered what is now considered the deepest complex chemosynthetic ecosystem ever recorded. This remarkable find, located in the Kuril-Kamchatka and Aleutian trenches, is composed of tubeworms, clams, snails, sea cucumbers, and other invertebrates — all thriving without sunlight by feeding on energy from methane and hydrogen sulfide seeping from the seafloor.




























































































































































































































































































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At the 2025 Time Space Existence exhibition in Venice at the Biennale, architectural firm MVRDV has unveiled a groundbreaking solar-responsive installation: the SOMBRA Pavilion. Designed in collaboration with Metadecor, Airshade, and Alumet, among others, the project is located in the lush setting of the European Cultural Centre’s Giardini Marinaressa.













































































































































Raven in her forest in the summer




Six people have died after a tourist submarine operated by Sindbad sank in the Red Sea near Hurghada, Egypt, at approximately 10:00 local time (08:00 GMT) on March 27. The cause of the sinking remains unclear, but the incident has reignited concerns over Egypt’s lax maritime safety standards, shoddy equipment, and lack of effective emergency response measures.


















































































































Others featured in the movie are Radhi Devulkia-Shetty, a plant-based cookbook author and natural health thought leader; Rina Harris, a functional podiatrist; Bonnie Wright, a Hollywood star in her youth (Ginny Weasley from Harry Potter); Arizona Muse —




![King George Military Hospital, 3rd floor Theatre Collection: Images from the History of Medicine (IHM) Contributor(s): Zwerdling, Michael, former owner Publication: [England] : [publisher not identified], [1915] Language(s): English Format: Still image Subject(s): Hospitals, Military, Operating Rooms, Surgeons, Nurses, King George Military Hospital Genre(s): Postcards Abstract: Black and white photograph of the 3rd floor operating theatre at King George Military Hospital, London, England. A surgeon is performing an operation with 7 medical personnel in attendance.](https://www.greenprophet.com/wp-content/uploads/vintage-operation-england.png)









Fuse Vectors founders Jordan Turnbull, Henrik Stage and Benjamin Blaha via Fuse


































The Ivanpah Solar Power Facility, a $2.2 billion concentrated solar plant in California, was once hailed as a breakthrough in renewable energy.










































































![Academics from the University of Bath have issued a new resource on the potential for regenerative design to deliver net-positive benefits, as well as actionable principles for change. RENEW: a manifesto for regenerative design and engineering is a 35-page electronic guidebook developed by the university’s Centre for Regenerative Design & Engineering for a Net Positive World (known as RENEW). A top 10 ranked university in the U.K., the University of Bath has demonstrated international leadership in research dedicated to achieving climate resilience, decarbonization, and a healthy future for the planet. The RENEW center takes a cross-disciplinary approach to developing systems for the built environment that harmonize benefits to society with the natural world. RENEW combines expertise from more than 40 academics, researchers, and industry stakeholders in water and chemical engineering, materials and composites, and placemaking and architecture with social science, economic, governance, and ecological studies. Image courtesy of the University of Bath The University of Bath’s Centre for Regenerative Design & Engineering for a Net Positive World (RENEW) has released a guidebook focused on defining regenerative design and expanding awareness of its prospects. Left to right: Dr. Juliana Calabria-Holley, co-director; Prof. Sukumar Natarajan, director; and Dr. Emma Emanuelsson, co-director. The University of Bath’s Centre for Regenerative Design & Engineering for a Net Positive World (RENEW) has released a guidebook focused on defining regenerative design and expanding awareness of its prospects. Left to right: Dr. Juliana Calabria-Holley, co-director; Prof. Sukumar Natarajan, director; and Dr. Emma Emanuelsson, co-director. Regenerative > Sustainable? Technology, science, and education have long focused on improving the human experience—such as by extending life expectancy worldwide—and evolving the spaces where we live, work, and play, but have done so through “extractive, non-regenerative practices,” said RENEW members in the manifesto. Sustainability has been championed for four decades to manage and minimize damage to the Earth’s resources but has been slow to penetrate the industrialized world. The guidebook’s authors note that contemporary net-zero emissions efforts and global climate target policies do not prescribe a way forward for “human systems to contribute positively to natural systems.” In order to adequately mitigate the impacts of climate change, improve biodiversity, and rebalance social inequities, the RENEW manifesto authors indicate that society requires an evolution from resource exploitation to a framework that prioritizes restoration of the global ecosystem. Image courtesy of the University of Bath Cover image for RENEW: a manifesto for regenerative design and engineering “Regenerative design, as a philosophy and practice, aims not merely to limit the damage we cause to the environment but to restore natural systems.” In an announcement launching the RENEW guidebook, center director and professor Sukumar Natarajan said that the initiative is designed to provide guiding principles for engineering, architecture, and other disciplines that enable society to “create resilient, fair communities that can thrive in balance with nature, while improving standards of living.” Six Principles of Regenerative Design The RENEW manifesto lays out six guiding principles of regenerative design, then offers a framework for putting them into practice. The six principles include: Reflective governance—Establish continuously evolving metrics and monitoring practices to track progress and impact. Embrace interconnectivity—Recognize that the world is intricate and interdependent. Take a holistic view accounting for the dynamic relationships between ecosystems and communities. Work as nature—Work harmoniously with and as nature. Design systems that work as part of species and ecosystem patterns, processes, and cycles. Prioritize net positive—Prioritize regeneration, replenishment, and restoration, recovering and reusing waste to create net-positive solutions and an abundance of resources. The aim should be to repair, sustain, and enrich the planet, rather than deplete its precious resources. Cultivate resilience—Systems should be designed with a capacity to adapt, diversify, and self-renew even in the face of uncertainty, change, and disturbances. Transmit—Document, curate, and publicize to help proliferate best practice through active discourse on a global scale. The authors concluded that the guide is intended as a foundation for continuously evolving this multidisciplinary approach to solving building/engineering problems. Center co-director Emma Emanuelsson observed that “We want this manifesto to help create a less anxious future for today’s young people, and for humans and nature to prosper in equal measure. […It] may not show us the full journey, but it does have advice and a framework to allow us to get started.” For the full guidance, readers can download RENEW: a manifesto for regenerative design and engineering free of charge from the University of Bath’s website.](https://www.greenprophet.com/wp-content/uploads/regenertive-design-bath.avif)




During the Spring Meeting in 































































































































































The energy company Vattenfall and design studio Superuse converted a nacelle, the top part of a wind turbine, into a tiny house. This nacelle is 4 yards wide, ten yards long and three yards high and comes from a turbine that stood in Austria for 20 years.














































































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![Scientists want to use transmitters to trace the movements of elephants in Aceh. They are strapped to their neck so… [more]© MPI of Animal Behavior/ MaxCine](https://www.greenprophet.com/wp-content/uploads/icarus-elephants.webp)














































The origins of writing in 


























Band E Amir National Park: forbidden for women










































With 75% of the world’s soils degraded, the future of the teeming community of living species that live underground face a dire future without restoration, says microbial ecologist Dr Jake Robinson, from the




















































is your honey real or fake? “When people learn to work for the bees’ welfare, much sensitivity and gentleness is developed, and that could translate into our daily life. In this way the bees teach us to act for society, to live in co-existence, let go of stigmas, and help us get closer to ourselves, others, the land and the world,” says Oud.



























































Gedaliah has been involved in the high-tech world since 1994 both in Jerusalem, New York and Beijing. He has also been a teacher of the Talmud since 1974 and is currently the spiritual leader of two Igbo communities in Nigeria.






























































































Jerusalem celebrates Gag Eden, a play on words for Gan Eden or the Hebrew word for paradise. It is a 3-day green roofs festival in the heart of the city
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Cockroaches are everywhere, getting in our houses, food, and garbage. 













































































































































