Urban Evolution with Liz Carlen
treehugger podcast
In this episode, Michael talks with evolutionary biologist and urban ecologist Dr. Elizabeth Carlen about how cities - shaped by war, politics, religion, and everything in between - are evolving alongside the wildlife that calls them home. Liz is an urban evolutionary biologist whose research explores how human social structures, from redlining to sacred groves, shape the genetics, behavior, and survival of city-dwelling creatures like squirrels and pigeons. We dive into the often-overlooked ways that social histories leave their mark not just on human communities, but on the DNA of the...
info_outline
My Head for a Tree with Martin Goodman
treehugger podcast
In this special episode, we welcome author and storyteller Martin Goodman to explore the extraordinary living story of the Bishnoi people—a community in the Western Thar Desert of India who have made protecting life, in all its forms, their deepest devotion. Three centuries ago, 363 Bishnoi villagers led by Amrita Devi gave their lives to defend the sacred khejri trees from destruction, speaking the words still taught to Bishnoi children today: “My head for a tree is a cheap price to pay.” But the Bishnoi are not just a story of sacrifice from the past—they are still here, still...
info_outline
Giants on New Ground with Philip Stielstra
treehugger podcast
We are joined by Philip Stielstra, founder of, to explore the fascinating world of coast redwoods (Sequoia sempervirens) and giant sequoias (Sequoiadendron giganteum). Philip shares his inspiring journey from Seattle Tree Ambassador to becoming a leader in assisted migration, helping these ancient giants find a new future in the Pacific Northwest. We dive into: The unique traits that make coast redwoods and giant sequoias candidates for assisted migration, including their fire resistance, drought tolerance, and pest resistance. Challenges such as slow seed...
info_outline
A Natural History of Empty Lots with Christopher Brown
treehugger podcast
treehugger podcast is 5 years old this month! In this episode, we sit down with Christopher Brown, author of A Natural History of Empty Lots, to uncover the stories hidden in the overlooked spaces of our cities. Christopher shares his unique perspective on urban landscapes—vacant lots, overgrown alleys, and forgotten corners—revealing the vibrant ecosystems and cultural narratives thriving within them. Drawing on his experience as a speculative fiction writer, he challenges us to rethink the value of these unintentional landscapes and their role in shaping our connection to the wider...
info_outline
Ecosystem Monitoring with Dylan Mendenhall
treehugger podcast
In this podcast episode, the discussion dives into the complexities and nuances of ecosystem monitoring, led by the Dylan Mendenhall's deep experience and passion for the field. He emphasizes the importance of well-defined questions to drive high-quality monitoring efforts, contrasting effective monitoring with what they term “zombie monitoring”—data collection that continues without purpose due to sunk cost fallacies or lack of clear objectives. The conversation spans from traditional techniques like plot-based sampling and transect surveys to advanced molecular methods like eDNA, which...
info_outline
medicinal weeds: rethinking integrated pest management
treehugger podcast
We explore a fresh perspective on non-native and introduced species. Traditionally viewed as pests or threats to ecosystems, some of these species offer hidden benefits that are often overlooked in conventional pest management frameworks. We dive into the complexities of integrated pest management (IPM), discussing the importance of balancing ecological restoration with justice, health, and livelihoods. This episode was adapted from a talk originally given to an audience focused on integrated pest management. It encourages listeners to rethink the language we use around non-native species,...
info_outline
Seed Banks and Ecological Memory
treehugger podcast
Underground seed banks, passive restoration, and ecological memory - these elements are crucial in understanding and facilitating natural recovery processes in ecosystems. We'll explore how leveraging underground seed banks, which contain dormant seeds waiting for the right conditions to germinate, can support native plant regeneration. This approach is relational, often less expensive, and informs a long-range view. It also relies on the ecological memory, which refers to an ecosystem's ability to retain information about past states and disturbances, aiding its recovery and resilience....
info_outline
Artificial Intelligence and Ecological Restoration with Sam Woodrich and Timothy Pape
treehugger podcast
This episode delves into the integration of artificial intelligence within the field of ecological restoration. Covering a broad spectrum from the practical to the philosophical, the conversation explores the potential for AI to reshape restoration practices, the ethical considerations at play, and the importance of balancing technological advancement with traditional ecological knowledge. Through personal anecdotes, professional experiences, and a look towards the future, the guests offer a comprehensive exploration of how AI is shaping the landscape of ecological restoration and what that...
info_outline
Ecological Forestry with Seth Zuckerman and Kirk Hanson
treehugger podcast
In this episode, we're joined by two extraordinary guests, Seth Zuckerman and Kirk Hansen, who bring decades of experience and insight to the practice of ecological forestry. Their recent book, "," serves as a comprehensive guide for forest stewards in Oregon and Washington, covering essential skills like evaluating land, sustainable management, wildfire risk reduction, and climate change adaptation. Seth and Kirk address the diverse needs of family forest owners, community forests, municipalities, and Indigenous tribes, offering insights on sustainable wood harvest, wildlife habitat...
info_outline
Restoration & Herbalism United with Natalie Hammerquist
treehugger podcast
In this episode, we delve into the world of plant medicines. Our guest, Natalie Hammerquist, a herbalist based in Washington state, shares her extensive knowledge and experience in herbalism and foraging local wild plants. Natalie's journey, rooted in a degree from The Evergreen State College, led her to explore herbalism, plant taxonomy, and food science. Under the guidance of renowned herbalists like Cascade Anderson Geller and Matthew Wood, Natalie integrated aspects of Chinese medicine and Western herbalism into her practice. What's particularly intriguing about our conversation is...
info_outlineIn this episode, Michael talks with evolutionary biologist and urban ecologist Dr. Elizabeth Carlen about how cities - shaped by war, politics, religion, and everything in between - are evolving alongside the wildlife that calls them home. Liz is an urban evolutionary biologist whose research explores how human social structures, from redlining to sacred groves, shape the genetics, behavior, and survival of city-dwelling creatures like squirrels and pigeons.
We dive into the often-overlooked ways that social histories leave their mark not just on human communities, but on the DNA of the animals that live among us. From prayer animal releases and colonial land grabs to the silent corridors of segregation - era parks, we trace how the built environment (and the power structures behind it) drive biological change.
Together, we explore how urban wildlife, often seen as out-of-place or alien, can actually reveal deep truths about the endurance of life, adaptation, and the stories we tell ourselves about nature in cities. From the sidewalks of New York to the treetops of St. Louis and the birds of Mexico City, this is a rich and fascinating conversation on the entangled evolution of people and animals in the urban jungle.
Episode Links
The Conversation article: War, politics and religion shape wildlife evolution in cities
Dr. Elizabeth Carlen’s website: www.elizabethcarlen.com
Nature Cities review article "Legacy effects of religion, politics and war on urban evolutionary biology": https://www.nature.com/articles/s44284-025-00249-3
Stay Connected
Explore this episode and others at treehuggerpod.com, or reach out anytime at treehuggerpod@gmail.com. Follow us on social media: @treehuggerpod
Support Treehugger Podcast
It takes a community to keep this independent podcast going. If you value the conversations we’re having, consider donating to help cover the small but real overhead costs:
PayPal: paypal.me/myadrick
Venmo: @myadrick
CashApp: $michaelyadrickjr
Subscribe, rate, and review the show on your favorite platform to help others find these conversations. And of course, tell a friend.
Music from the episode: Alge, MK2, Lish Grooves