• Mark Moffett
Photographer and biologist Mark Moffett talks with Boyd about the death of his friend, herpetologist Joseph Slowinski. On September 11, 2001, Moffett was with Slowinski in a remote region of Burma when Slowinski was bitten by a deadly snake. Moffett tells Boyd that from this experience he’s learned that real conservation means loving and saving even the dangerous parts of nature.
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• S. Jacob Scherr
“A Failure of Historic Proportions!” “Not Worth the Paper it’s Written on…” The headlines out of the United Nations Climate Change Conference 2009 in Copenhagen were overwhelmingly negative. But S. Jacob Scherr, director of the Natural Resources Defense Council’s International Program, was in Copenhagen and has a different take on what happened there.

• Daniela Papi
When 2009 Geotourism Challenge winner Daniela Papi traveled to Cambodia she was inspired to begin a program called PEPY ("Protect the Earth, Protect Yourself") to organize educational bicycle trips around the country and at the same time foster local development. Papi tells Boyd that the organization now operates education programs in over a dozen schools and rural villages.

• Potato Richardson
The Tevis Cup is an annual 100-mile endurance horse race. Not only has cowboy and rancher Potato Richardson won this race more than once, he’s finished it twenty times — once in a tuxedo. Boyd and Richardson recall the time they rode the race together.
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• David Braun
National Geographic News editor David Braun joins Boyd to talk about the first vulture restaurant in Turkey.
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• Graham Hawkes
Billionaire Sir Richard Branson has a new toy: a new submarine that looks like it is part jet fighter and part convertible. The submersible, designed by Graham Hawkes, allows riders to fly underwater. Boyd talks with Hawkes about the new sub and what it’s like to swim alongside hammerhead sharks, whales and dolphins.
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• Asa Firestone & Matt Othmer
Last time we talked with National Geographic grantee Asa Firestone he and his climbing partner Matt Othmer were hanging off the side of a vertical cliff face. This time Boyd catches up with them from the summit of a granite peak in the Cochamo Valley in Chile.
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• Geoff Cape
2009 Geotourism Challenge finalist Geoff Cape is working to bring nature back into the city of Toronto by transforming an abandoned brick factory into an environmental community center.
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• Julie Estie
What has 58 legs, 15 mouths and runs 1,000 miles across the Yukon Territory? A competitor in the annual Yukon Quest dog-sled race. Boyd talks with Julie Estie, an organizer and former competitor in the race, to find out what it takes to win.
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• Boyd shares a story about sleeping on a dog sled on a night when the mercury dipped to 60 degrees below zero.