Award-winning author David Quammen, an American writer who focuses on science, nature and travel, talks about his work over the years and what’s next.

Bonnie Monteleone from the Plastic League Project discusses the organization’s latest studies and what they are doing to clean up our oceans.

Award-winning environmental journalist, Zoë Schlanger, joins the show to speak about her new book, "The Light Eaters," a deep immersion into the drama of plant life and the complexity of this wild and awe-inspiring world that challenges our very understanding of agency, consciousness, and intelligence.

Biologist Naira de Gracia walks us through her new book, "The Last Cold Place – A Field Season Studying Penguins in Antarctica," which offers a dramatic and captivating window into Antarctica and a generation of chinstrap penguins.

Daniel Lewis is the Dibner Senior Curator for the History of Science and Technology at the Huntington Library, Art Museum, and Botanical Gardens in Southern California, and a writer, college professor, and environmental historian. In this segment he discusses his new book, Twelve Trees: The Deep Roots of Our Future.

Park City Community Foundation’s Climate Fund's Eyee Hsu and Andy Hecht discuss their goal to fully divert food waste from Summit County's landfill by 2030.Then Danielle Nierenberg, President of Food Tank joins the show. Food Tank is a research and advocacy organization that highlights how food and agriculture could be a solution to some of our most pressing environmental problems.

Chris and Claire talk with author and speaker Rob Verchick, one of the nation’s leading scholars in disaster and climate change law and a former EPA official in the Obama administration. He shares more on his latest book, "The Octopus in the Parking Garage." In it, Verchick examines how we can manage the risks that we can no longer avoid, laying out our options as we face the climate crisis.Then, the Department of Agriculture is proposing a nationwide plan focused on protecting federal old-growth forests. The proposal would amend all land management plans governing the National Forest System. Garett Rose from the National Resources Defense Council joins the show to discuss this plan.

In the first part of the show, Chris and Claire revisit a discussion with evolutionary biologist and author Noah Whiteman, as he talks about his book, "Most Delicious Poison, The Story of Nature’s Toxins from Spices to Vices."Then author and speaker on climate change politics, Michael Gunter joins the show to talk about his latest book, "Climate Travels."

Tis the season for holiday gatherings and imbibing in various specialty holiday cocktails. In this spirit, we welcome Sara Sargent of Alpine Distilling to This Green Earth. We’ll talk about Alpine Distilling’s sustainability practices across the company, and we’ll hear more about the art of botanical spirits from soil to bottle.Then, Chris and Claire revisit a interview from November with Conservation Science Director Steve Slater for HawkWatch International, who comes on the show to discuss the conservation of bird's of prey.

Research scientist and Utah native Joshua Fisher talks about his new book "Managing Environmental Conflict," in which he provides collaborative approaches to managing environmental disputes. Then, Dr. Erle Ellis, Director of the Anthroecology Lab and Professor of Geography & Environmental Systems at the University of Maryland, discusses the challenges facing our ever warming world and his New York Times Op Ed titled "1.5 Degrees Is Not the Problem."