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.