90 Miles from Needles: the Desert Protection Podcast

Chris Clarke

Join Chris Clarke and a variety of guests as they explore the challenges and opportunities of the American Southwest's fragile ecosystems. Engaging interviews with experts, activists, and advocates on conservation, land management, and environmental justice. Science and sentiment, politics and philosophy, hiking and history, culture and creativity all go into defending the desert. Be forewarned: We are out to recruit you to the cause.

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  1. 17h ago

    S5E33: From Starfleet to the Sonoran Desert: Coping With a Burro Onslaught

    Listeners in Joshua Tree and Moab may think their homes are overrun with jackasses, but this episode's guest has got them beat. We talk with Dr. Jennifer Anderson, whose diverse career has brought her to stewarding 300 acres of Sonoran Desert landscape in Mohave County, Arizona. But restoring her former 19th Century mine site has not proved as straightforward as Anderson had imagined. Western Arizona landscapes — and others throughout the deserts — are contending with a huge increase in the numbers of feral burros, introduced centuries ago but newly prospering at the expense of the desert. Anderson details the impact her unwanted guests have caused to her part of the desert, and the cascade of unpleasant effects that stem from the donkeys' presence as well as the inability of land management agencies to contend with the issue. Plus! Our first ever listener contest: correctly identify all the birds in Fred Bell's nature audio and message Chris, and you may win a 90 Miles from Needles T-shirt. The first three listeners who email Chris with a correct ID, a t-shirt size, and a mailing address will get some mail from us. Citation links and further reading AZGFD study — Associations between a feral equid and the Sonoran Desert ecosystem — Esther S. Rubin, Dave Conrad, Larisa E. Harding, and Brianna M. Russo; Wildlife Monographs 215, e1083, published June 26, 2024. Fieldwork in 2017–2019 compared areas with and without established burro herds near Lake Havasu and Lake Pleasant. Environmental Assessment — Big Sandy Alamo and Lake Havasu Wild Burro Gather and Population Control Plan — BLM Kingman Field Office, DOI-BLM-AZ-C010-2023-0025-EA. Official document index for the final revised EA, Finding of No Significant Impact, and Decision Record. Decision issued September 13, 2024. Expand Final Documents to access the assessment. BLM 2025 Three Rivers Complex gather and daily reports — Official record of the bait and water trapping operation and fertility control work. Alamo Herd Management Area — BLM geographic profile and appropriate management level. Big Sandy Herd Management Area — BLM geographic profile and appropriate management level. Havasu Herd Management Area — BLM geographic profile and appropriate management level. AZGFD explanation of the burro study — Accessible agency summary of the ecological concerns. National Academies review of equid fertility management — Methods and Effects of Fertility Management, in Using Science to Improve the BLM Wild Horse and Burro Program A Way Forward (2013). Mountain lion predation study — Lundgren and colleagues (2022), A novel trophic cascade between cougars and feral donkeys shapes desert wetlands. Background relevant to the predator discussion. NPS saguaro biology and nurse trees — Background on young saguaros, nurse trees, growth, and roots. Federal wild horse and burro law — Official U.S. Code PDF covering private-land removal and criminal provisions, including 16 USC 1334 and 1338. Guest and episode links Sonoran Desert Sanctuary Anderson-Arroyo Foundation Fellowship for Desert Reporting Support 90 Miles from Needles This episode's sponsor Copper Mountain College Contact Chris Become a desert defender!: https://90milesfromneedles.com/donate See omnystudio.com/listener for privacy information.

    S5E33: From Starfleet to the Sonoran Desert: Coping With a Burro Onslaught
  2. 6d ago

    S5E32: Hiding Big Projects in Small Pieces

    As promised a few episodes back, Chris explores a sneaky trick developers sometimes try to use to evade legally required environmental analysis of their projects. Segmentation, the term of art for dividing a large project into smaller pieces to obscure the environmental impacts of the whole project, is likely to become more frequent as the Trump administration keeps hacking away at environmental protection laws. Chris provides a handful of illuminating examples: Cadiz gets the Interior Department to assess the company’s Northern Pipeline separately from the pumping it would enable, prompting new desert protection lawsuits. A non-desert example: 14 years ago, frontline community groups successfully challenged an upgrading of Chevron Oil’s refinery on Richmond, California. Though their allegations of segmentation (called “piecemealing” in California state law) didn’t sway a judge, the case illustrates how reasonable people can disagree on what constitutes segmentation.   As the Federal approach to NEPA changes, Chris briefly examines what the erosion of CEQ regulations means for protecting the public and the environment from improperly segmented project proposals. An Imperial County victory: the court overturned a data center’s lot merger approval and required environmental review of the entire development. Fred Bell shares the dawn chorus from Sabino Canyon in Tucson. Apply for DAMN’s Fellowship for Desert Reporting, and support independent desert journalism through a donation to 90 Miles from Needles. Cadiz lawsuit by Tribal Nations, NALC and NPCA, July 28, 2026: identifies plaintiffs and explains their objections to separate pipeline review. Cadiz lawsuit by the Center for Biological Diversity and Sierra Club, July 28, 2026: Earthjustice’s account of the parallel challenge. NPCA and NALC’s 2021 Northern Pipeline lawsuit: background on the earlier approval and litigation. Communities for a Better Environment v. City of Richmond, 2010 appellate opinion: the decision distinguishes the successful project-description and greenhouse-gas claims from the rejected piecemealing claim. Earthjustice on the Richmond refinery appeal: the community groups’ account of the outcome. City of Imperial data center information and court documents: includes the September 9, 2026 decision, tentative decision, petitions and project documents. KPBS coverage of the September 9 data center ruling: accessible explanation of the ruling. Department of Energy history of CEQ regulations: official timeline and links to the rescission rules. January 8, 2026 CEQ final rule: official Federal Register publication. Podcast and support links S5E1: Standing Up to Tech Giants: Desert Locals vs. California’s Largest Data Center Fellowship for Desert Reporting Support 90 Miles from Needles Copper Mountain College Become a desert defender!: https://90milesfromneedles.com/donate See omnystudio.com/listener for privacy information.

    S5E32: Hiding Big Projects in Small Pieces
  3. Sep 17

    S5E30: Why Deserts Need Defending

    For our 150th episode, we return to a foundational question: why does the desert need people speaking up for it? Chris offers four answers. Deserts are widely misunderstood as empty or expendable. They remain surprisingly understudied, even when familiar species such as Joshua trees are concerned. Desert protection cannot be separated from Indigenous sovereignty, migration, heat inequality, contaminated water, and the lives of working people. And beneath the science, policy, and activism lies a simpler reason: we love these places. Listeners Kimberly, Nancy, and Diane share their own reasons for caring about deserts. Fred Bell supplies the nighttime voices of Woodhouse’s and Amargosa toads at Ash Meadows National Wildlife Refuge. After the closing credits, Chris looks back at the geographical and topical reach of the podcast’s first 150 episodes—and identifies some of the places still missing from the archive. In this episode: Why calling deserts “empty” makes them easier to sacrifice Creosote rings, desert fire and ecological time How invasive grasses have transformed wildfire in the Mojave Why conspicuous desert species can remain surprisingly understudied Environmental justice, border communities and urban heat What love contributes to conservation Where 150 episodes have taken us—and where the podcast needs to go next Resources and related listening: The National Park Service explains how invasive plants can create a cycle of increasingly frequent and extensive Mojave fires: Fire in the Mojave Desert. NPS reports that the 2020 Dome Fire burned 43,273 acres, killed as many as 1.3 million Joshua trees and exposed the forest to a potential invasive-grass fire cycle: Dome Fire. Related episode: S4E31: Five Years On—Cima Dome After the Flames. Related episode: Joshua Trees and Family Trees. The Joshua Tree Genome Project and affiliated researchers are using mapping, crowdsourced observations and machine learning to study Joshua tree populations: The Yoder Lab at CSU Northridge. NOAA’s current assessment of the strengthening 2026–27 El Niño: ENSO Diagnostic Discussion. Related episode: S5E28: Four Things You Need to Know About Desert Flooding. Support the podcast at 90milesfromneedles.com/donate. Learn about the Fellowship for Desert Reporting at thedamn.org/fellowship. Not sure where to start with 150 episodes? Visit our Start Here page for a selection of episodes that offer a good introduction to 90 Miles from Needles. Become a desert defender!: https://90milesfromneedles.com/donate See omnystudio.com/listener for privacy information.

    S5E30: Why Deserts Need Defending
  4. Sep 11

    S5E29: Why Was the North Kaibab Trail Still Open?

    Journalist Joe Dana of 12 News in Phoenix joins Chris Clarke to discuss questions raised by the August 29 flash flood in Grand Canyon National Park—and what happened inside the National Park Service before the disaster. After the 2025 Dragon Bravo Fire, Grand Canyon Trails Supervisor Adam Gibson warned publicly that the upper North Kaibab Trail had become a substantially more hazardous environment. In a March appearance on The Grand Canyon Hiker Dude Show, Gibson described debris flows, hydrophobic soils and risks likely to persist for years. Dana's reporting goes further. Sources told him that Gibson had recommended keeping the North Kaibab Trail closed for the 2026 season, and that park leadership initially appeared receptive to that recommendation before the entire trail reopened May 15. NPS had previously described its reopening strategy as adaptive, promising to “open what we can, where we can, when we can,” while balancing visitor safety, resource protection and operational readiness. Chris and Joe talk about the pressures on park managers to restore public access, the risks faced by trail crews and visitors in a recently burned landscape, and the larger question built into National Park Service management: how do you provide public enjoyment of extraordinary places while ensuring that those places remain unimpaired for future generations? NPS policy says conservation ultimately takes precedence when those purposes genuinely conflict. The August 29 flood killed two hikers, left a third missing, prompted roughly 80 rescues, and devastated infrastructure along Bright Angel Creek. As of September 8, the North Kaibab Trail, Phantom Ranch, Bright Angel Campground and several other inner-canyon areas remain closed, with no estimated reopening date. Links and background Joe Dana and 12 News Grand Canyon Hiker Dude: Adam Gibson's March 4 interview NPS: North Rim reopening announcement, March 25 NPS: Current North Rim and North Kaibab Trail status National Park Service Management Policies: conservation and public enjoyment Chris will also be taking 90 Miles from Needles to El Paso for the Fourth Chihuahuan Desert Conference, November 4–6, 2026, at the El Paso Zoo and Botanical Gardens. Chihuahuan Desert Conference information Become a desert defender!: https://90milesfromneedles.com/donate See omnystudio.com/listener for privacy information.

    S5E29: Why Was the North Kaibab Trail Still Open?
  5. Sep 4

    S5E28: 4 Things You Need to Know about Desert Flooding

    Episode thumbnail photo by Bo Insogna. The deadly August 29 flood in Grand Canyon National Park received national attention, but it was not an isolated event. Flooding struck communities, parks and backcountry destinations across Utah, Arizona and New Mexico throughout the summer. Chris Clarke presents four things we should understand about desert flash floods: they are regional rather than isolated disasters; they are fundamental forces that build desert landscapes; blaming victims can undermine safety; and better preparation, warnings, closures and land-use decisions can reduce the danger. The episode also explains why violent monsoon floods do little to relieve the Colorado River drought. Key takeaways The Grand Canyon flood was part of a much wider period of destructive Southwest monsoon flooding. Flash floods are not aberrations in deserts. They carve canyons, move boulders, reroute washes and build alluvial fans. Experience and preparation reduce risk, but they cannot eliminate it. Blaming victims encourages people to treat safety warnings as advice intended for someone less competent. Closures, permits, upstream monitoring, better flood maps and responsible land-use decisions can save lives. Intense local flooding does not necessarily produce enough water to replenish major reservoirs or end a regional drought. Notable quote“The sustained river incision and the geological uplift are the canvas. The flash floods are the brushstrokes.” Griffiths, Peter G., Robert H. Webb, and Theodore S. Melis. 2004. “Frequency and Initiation of Debris Flows in Grand Canyon, Arizona.” Journal of Geophysical Research: Earth Surface 109(F4).DOI: 10.1029/2003JF000077 Melis, Theodore S., Robert H. Webb, Peter G. Griffiths, and T.J. Wise. 1994. Magnitude and Frequency Data for Historic Debris Flows in Grand Canyon National Park and Vicinity, Arizona. USGS Water-Resources Investigations Report 94-4214.DOI: 10.3133/wri944214 Cannon, Susan H., et al. 2008. “Storm Rainfall Conditions for Floods and Debris Flows from Recently Burned Areas in Southwestern Colorado and Southern California.” Geomorphology 96(3–4): 250–269.DOI: 10.1016/j.geomorph.2007.03.019 Goodrich, David C., et al. 2018. “Southwestern Intermittent and Ephemeral Stream Connectivity.” Journal of the American Water Resources Association 54(2): 400–422.DOI: 10.1111/1752-1688.12636 Swain, Daniel L., et al. 2020. “Increased Flood Exposure Due to Climate Change and Population Growth in the United States.” Earth’s Future 8.DOI: 10.1029/2020EF001778   Become a desert defender!: https://90milesfromneedles.com/donate See omnystudio.com/listener for privacy information.

    S5E28: 4 Things You Need to Know about Desert Flooding
  6. Aug 28

    S5E27: Sonoran Toads and the Dirty Business of Ego Death

    Journalist Kimon de Greef joins Chris Clarke to discuss his new book, The Ego Trip: Psychedelic Toads, a Trail of Deaths, and the Guru Who Peddled Transcendence. The Sonoran Desert toad (Incilius alvarius) spends most of the year underground, emerging to breed during summer rainstorms. It is also the only animal known to produce 5-MeO-DMT, an extraordinarily powerful psychedelic compound, in its defensive secretions. That biological curiosity has made the toad the center of a global psychedelic industry.  Chris and Kimon discuss how Sonoran toad secretions changed from a little-known psychedelic tool into an international spiritual commodity; how outsiders profit from romanticized ideas about Indigenous tradition; and what the resulting trade means for the toads, the people hired to collect them, and communities living amid poverty and cartel violence. They also examine parallels with the commercial appropriation and poaching of white sage, and consider an uncomfortable contradiction: people seeking healing, transcendence and communion with nature may be supporting a supply chain built on wildlife exploitation, misinformation and harm. Content Note This episode contains discussion of drug use, addiction, death, animal mistreatment and abusive psychedelic practices. It is not intended as medical advice or encouragement to use 5-MeO-DMT or any other controlled substance. About Kimon de Greef Kimon de Greef is a South African journalist whose work has appeared in The New Yorker, The New York Times, The Guardian, National Geographic, Guernica and other publications. He has a master’s degree in conservation biology from the University of Cape Town and a master’s degree in journalism from New York University. Much of his reporting concerns wildlife trafficking, illicit economies and the complicated relationships between human desire and the natural world. Kimon de Greef’s website Kimon on Instagram Buy The Ego Trip through Bookshop.org Publisher’s page for The Ego Trip In this episode The remarkable monsoon-dependent life of the Sonoran Desert toad What 5-MeO-DMT is, and why “toad licking” is both inaccurate and dangerous How Octavio Rettig helped popularize toad-derived 5-MeO-DMT Claims that toad smoking is an ancient Comcáac/Seri tradition Psychedelic tourism, cultural appropriation and spiritual marketing The economic realities behind supposedly “responsibly sourced” toad secretions Toad collection, repeated “milking,” displacement and disease transmission Why synthetic 5-MeO-DMT removes the need to exploit wild toads Parallels between the toad trade and the international market for poached white sage What scientists know and don't know about the toad’s population status The difficulty of conducting conservation research in cartel-controlled areas Why a potentially profound experience can still leave a trail of real-world harm Selected timestamps 00:02:07 — How Kimon found the story 00:03:52 — Sonoran Desert toad natural history 00:06:20 — 5-MeO-DMT and the toad’s defensive secretions 00:08:47 — Octavio Rettig and the rise of “toad medicine” 00:11:34 — The Comcáac community and claims of recovered tradition 00:14:50 — Is there evidence of ancestral toad use? 00:20:15 — Psychedelic tourism and its consequences 00:22:30 — Seri ironwood carving and the creation of “tradition” 00:30:10 — The parallel with white sage 00:34:59 — Toad-derived versus synthetic 5-MeO-DMT 00:38:44 — Inside the toad-secretion supply chain 00:44:35 — What is happening to wild toad populations? 00:50:27 — Psychedelic experience, reporting and ethical distance Further reading and resources Kimon de Greef’s original New Yorker investigation, “The Pied Piper of Psychedelic Toads” De Greef on the collection trade, “The Psychedelic Toad Milkers” High Country News, “A Hallucinogenic Toad in Peril” Sonoran Desert Toad Fund, supporting research and conservation throughout the species’ range Tucson Herpetological Society, whose president Robert Villa has worked extensively on the toad’s conservation Sonoran Desert toad species account from AmphibiaWeb U.S. Fish and Wildlife Service, Sonoran Desert toad species profile PLOS One, “Diet and Chemical Defenses of the Sonoran Desert Toad” California Native Plant Society, White Sage Protection Become a desert defender!: https://90milesfromneedles.com/donate See omnystudio.com/listener for privacy information.

    S5E27: Sonoran Toads and the Dirty Business of Ego Death
  7. Aug 14

    S5E26: Maps, Vanished Lakes, and Two Desert Squirrels

    We think of range maps as static representations of where plants and animals belong. It doesn't often occur to us that maps are just snapshots of a constantly changing world. In the Mojave Desert, two sister species of desert ground squirrel coexist nearly side by side. A field guide's range maps will tell you where those species live right now. But those maps also convey hints out of Deep Time, and those hints can explain not only why the squirrels live where they do, but also how the two species evolved in their own directions. Host Chris Clarke shares the story of those sister species: the Mohave and Round-tailed ground squirrels. One is doing well and is abundant. The other has been designated as a threatened species. Each of them is a library of history... if we know how to read them. Chris also announces the launch of our Fellowship for Desert Reporting: prospective Fellows can start by filling out the application form at https://thedamn.org/fellowship-application. Resources  Mohave ground squirrels California Department of Fish and Wildlife: Mohave Ground Squirrel Species overview, conservation status, recordings and access to the state conservation strategy. CDFW Mohave Ground Squirrel Philip Leitner, “Current Status of the Mohave Ground Squirrel: An Update Covering the Period 2013–2020” Reviews the animal’s current distribution, apparent losses from portions of its historical range and continuing conservation concerns. Status update PDF Mohave Ground Squirrel Technical Advisory Group CDFW’s archive of technical documents and meeting materials from researchers, agencies and other specialists. Technical Advisory Group Mohave Ground Squirrel Conservation Council: Publications A bibliography covering the species’ taxonomy, ecology, genetics, distribution and conservation. Publications list Separation, contact and hybridization Kayce C. Bell and Marjorie D. Matocq, “Regional Genetic Subdivision in the Mohave Ground Squirrel: Evidence of Historic Isolation and Ongoing Connectivity in a Mojave Desert Endemic” Animal Conservation 14 (2011): 371–381. Examines genetic structure and historical isolation within Mohave ground squirrel populations. Article and abstract Philip Leitner, Jennifer S. Rippert and Marjorie D. Matocq, “Genetic Structure Across a Contact Zone Between Xerospermophilus Ground Squirrels in Southern California” Western North American Naturalist 77 (2017): 152–161. Documents both species and genetically admixed animals near Hinkley. It also reports expansion across the former barrier of no more than approximately 30 kilometers—an average of no more than five meters per year. Full article “Distribution and Genetic Status of Xerospermophilus Ground Squirrels in the Barstow Region” Includes useful maps of trapping records and genetically identified Mohave, round-tailed and hybrid or backcrossed animals around Barstow and Hinkley. CDFW-hosted report Mojave River and vanished lakes Marith C. Reheis et al., “Geomorphic History of Lake Manix, Mojave Desert, California: Evolution of a Complex Terminal Lake Basin” Geomorphology 392 (2021). A detailed modern synthesis of the lake basin’s development, changing river routes, tectonics and climate history. USGS publication page USGS: Surficial Geology and Stratigraphy of Pleistocene Lake Manix Detailed geologic mapping of Lake Manix, its component basins and the deposits exposed by the Mojave River and Afton Canyon. USGS Lake Manix map and report Marith Reheis and Joanna Redwine, “Lake Manix Shorelines and Afton Canyon Terraces: Implications for Incision of Afton Canyon” Discusses the overflow of Lake Manix and relatively rapid initial incision of Afton Canyon at approximately 25,000 calibrated years ago. USGS publication record USGS: Mojave River and Associated Lakes An accessible introduction to the Mojave River, Lake Manix, Lake Mojave and the modern Soda and Silver Lake playas. Mojave River and Associated Lakes Range maps and Joshua trees USGS: High-resolution distribution maps for western and eastern Joshua trees Describes empirical and modeled range maps for Yucca brevifolia and Yucca jaegeriana across four states. USGS Joshua tree distribution study Smith et al., “Genome-Scale Data Resolves the Timing of Divergence in Joshua Trees” American Journal of Botany 108 (2021). Estimates that the two Joshua tree species diverged approximately 100,000–200,000 years ago. Journal article Become a desert defender!: https://90milesfromneedles.com/donate See omnystudio.com/listener for privacy information.

    S5E26: Maps, Vanished Lakes, and Two Desert Squirrels

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Join Chris Clarke and a variety of guests as they explore the challenges and opportunities of the American Southwest's fragile ecosystems. Engaging interviews with experts, activists, and advocates on conservation, land management, and environmental justice. Science and sentiment, politics and philosophy, hiking and history, culture and creativity all go into defending the desert. Be forewarned: We are out to recruit you to the cause.

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