In this episode of Unearthing Optimism, Dan Lambe welcomes Dr. Cassie Rauser, CEO of TreePeople, to explore what it really takes to foster environmental resilience across the diverse landscapes of Los Angeles. Discover TreePeople’s holistic approach to climate action, from large-scale tree planting to community education programs, wildfire recovery, and creating schoolyard habitats that inspire the next generation.

Whether you’re a tree lover, an advocate for community action, or curious about the role of urban nature in our future, this episode will leave you inspired by what’s possible when people and trees thrive together.

Tune in now and be part of the hope in action.

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Presented by the Arbor Day Foundation
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In this episode of Unearthing Optimism, host Dan Lambe welcomes Peter Prengaman, Global Climate and Environmental News Director at the Associated Press. The AP is a not-for-profit news agency and is one of the oldest, largest, and most respected outlets in the world. Over the course of his career, Peter has reported from more than 15 countries across the world. Now, he and his team are bringing global environmental challenges into sharper focus for millions of readers.

From reporting in the Amazon to covering hurricanes and oil spills, Peter shares how environmental journalism can help inform a new understanding of people and the planet. Learn why he views climate change as a deeply human story and what he values about highlighting hope in the AP’s coverage.

Tune in now.

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Presented by the Arbor Day Foundation
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Adventure can be more than a thrill—it can also be a path to purpose.

In this episode of Unearthing Optimism, host Dan Lambe welcomes producer and outdoor adventurer Dylan Efron for a candid conversation about finding hope in nature and the lessons learned from a life outside the box. From the rivers of California to the rainforests of the Amazon and the coral reefs of Fiji, Dylan Efron shares how immersive outdoor experiences can be transformative. He also reflects on why connecting to the natural world is one of the best ways to nurture our mental health and build optimism for the future.

Whether you’re eager for your next adventure or looking for hope in the face of climate anxiety, this episode will inspire you to step outside, get involved, and plant seeds of change.

Don’t miss this uplifting journey, tune in now!

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Presented by the Arbor Day Foundation
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In this episode of Unearthing Optimism, host Dan Lambe welcomes science communicator and content creator Hank Green for an energizing conversation about the power of curiosity, community, and sustainability. Together, they explore the significance of the Internet in the environmental movement and what meaningful engagement can look like.

Hank also shares the story behind Good Store, a values-driven marketplace turning everyday purchases into global impact. Plus, he talks through the massive educational reach of Crash Course.

Listen now and share with a friend—because hope grows when we all get involved.

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Presented by the Arbor Day Foundation
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In this episode of Unearthing Optimism, host Dan Lambe sits down with climate resilience expert Dr. Vivek Shandas to dig into the urgent issue of extreme heat in U.S. cities—and the hope found in community-driven solutions.

From the science behind urban heat islands, to real-life stories of neighbors coming together in the face of record-breaking heatwaves, this episode explores why trees matter for our health, well-being, and sense of connection.

Join us for an optimistic conversation packed with ideas for how trees and teamwork can help communities reduce extreme heat.

Listen to this episode and share it with someone who cares about building a better, cooler future.

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Presented by the Arbor Day Foundation
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In this episode of Unearthing Optimism, host Dan Lambe welcomes Tom Schultz, the 21st Chief of the U.S. Forest Service, for a thoughtful conversation about the rewards and responsibilities that come with caring for America’s landscapes.

Chief Schultz opens up about leadership, stewardship, and tackling some of the toughest challenges in forestry today, like replanting after wildfires. He reflects on the power of partnership in the effort to grow forests and the importance of building trust with communities. Together, Dan and Chief Schultz explore what it means to lead with hope.

You’ll walk away with a fresh perspective on service, community, and what’s possible when we work together.

NOTE: As a note to our listeners, this podcast episode was recorded in December 2025.

Tune in now!

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Presented by the Arbor Day Foundation
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What does it take to inspire a love for science and turn it into action that shapes the world?

Host Dan Lambe sits down with iconic science educator Bill Nye as he shares his journey from comedian and engineer to host of the beloved children’s science show. Bill also digs in on his passion for space exploration, the power of optimism, and why the next generation gives him hope for the future.

Packed with memorable stories, timely insights, and all the contagious energy and humor you’d expect from Bill Nye The Science Guy, this episode is a must-listen and a reminder that science can inspire real action.

Listen to this special National Arbor Day episode, share with friends, and leave a review!

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Presented by the Arbor Day Foundation
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Host Dan Lambe is joined by acclaimed actor, writer, and passionate environmental advocate Rainn Wilson (best known as Dwight from The Office) for a funny and honest discussion connecting culture to conservation. Dan Lambe and Rainn Wilson dig into Rainn’s journey from the forests of Seattle to comedy fame, and why he’s now focused on bringing inclusivity, humor, and heart to the climate conversation. Hear how spiritual revelations, multiple wildfire evacuations, and a love of trees have fueled Rainn’s advocacy—and why he thinks creative storytelling might just be the key to hope and action.

Discover personal stories, surprising connections, and actionable ways YOU can help create a thriving planet for generations to come.

Want more optimism? Listen to this uplifting episode and share it with a friend.

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Presented by the Arbor Day Foundation
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