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Today on This Green Earth, Nell and Chris talk salmon repopulation and synthetic biology and biodiversity conservation. (01:52) Joining the first half of the show is Kent Redford, co-author of Strange Natures, an examination of the way we need to think about the intersection between our ability to change DNA, and what it means to be natural.(28:23) Then, Marc Commandatore from the California Department of Water Resources come on to discuss a pilot project to return endangered salmon to their historic habitat, and help them better survive California’s hotter and drier future.

Psychotherapist Dr. Dana Dorfman discusses how parents can tackle the anxiety they may be passing onto their children in her new book, "When Worry Works: How to Harness Your Parenting Stress and Guide Your Teen to Success."And local Dr. Vanessa Hart shares her new venture. After a long career as a general surgeon, she has started her own practice specializing in medical aesthetics at Spa Asteria in Park City.

Concussion expert and physical therapist Annie Howard shares how her own personal experience with a traumatic brain injury has intensified her passion for helping others with concussions. (00:41) Then M. Yvette Quintana and Jules Renner share how adult ADHD can be turned into a superpower. They say it is all about how you navigate it and make it work for you. (23:21)

Dr. Kimberly Nicholas, an associate professor of sustainability science at Lund in Sweden, shares her new book, "Under the Sky We Make: How to Be Human in a Warming World." (01:39) Conservation biologist David Shiffman explores the importance of sharks to the world's marine ecosystems. His new book, "Why Sharks Matter," addresses the threats sharks face and what scientists, NGOs and the public can do to support their conservation. (23:32)

Dive into COP27, the UN Climate Change Conference in Egypt, with international climate finance advocate Joe Thwaites from the National Resources Defense Council. University of Pennsylvania professor Jared Farmer, author of "Elderflora: A Modern History of Ancient Trees," shares the history of the world’s oldest trees as they’ve been marked by climate and people from prehistory onward.

Dr. Sasha Reed, an ecologist with U.S. Geological Survey, discusses soil restoration. (02:12)Jordan Boersma, a postdoctoral fellow at the Cornell Lab of ornithology, discusses the recent sighting of the critically endangered Black-naped Pheasant-Pigeon, which had not been seen for more than 140 years prior to Boersma’s discovery. (23:45)

Nell and Chris dive into the history of animals and humans in North America and take a critical look at the modern conservation movement.

Callie Bauer, who specializes in oncology massage at Intermountain Park City Hospital, shares a growing body of research showing promising results in clinical trials and in-hospital massage programs. (00:38) Then local author Bonnie Bedford Park presents the second book of her trilogy, "Six Weeks For Boat Mail." (26:12)

Essayist and biographer for the Dalai Lama, Pico Iyer, talks about how to find what truly fills a person with happiness. (00:00) Then, Vincent Tolman who was pronounced dead in 2003 and put in a body bag when a paramedic broke protocol to try, and succeed, to revive him. (24.32)

Dr. Marc Schulz shares how to be more fulfilled in "The Good Life: Lessons from the World's Longest Scientific Study of Happiness." (00:51) Author and lecturer Chris Bailey explores the science behind living a deeper, more intentional life in "How to Calm Your Mind: Finding Presence and Productivity in Anxious Times." (26:26)