• John Huston
John Huston and Tyler Fish just became the first Americans to ski to the North Pole without support and all on their own power. Huston joins Boyd by phone from Oslo, days after completing the trek. Huston tells Boyd how he and Fish slept only three of the last 66 hours in order to catch the last evacuation flight departing from the Pole!
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• Nathan Wolfe
2009 National Geographic Emerging Explorer Dr. Nathan Wolfe fights worldwide epidemics with an innovative, untraditional approach—he's working to create an early warning system that can forecast and contain new plagues before they kill millions. Wolfe joins Boyd in the studio to discuss the current outbreak of Swine Flu and why it wasn’t caught earlier.
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• Verlyn Klinkenborg
A lofty idea is blossoming in cities around the world, where acres of potential green space lie overhead. Verlyn Klinkenborg, author of the May National Geographic magazine article “Up on the Roof,” joins Boyd to talk about the benefit of green roofs.
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• Alexandra Cousteau
Her legendary grandfather, Jacques, and father, Philippe, explored the world’s ocean wonders, but today Alexandra Cousteau explores new ways to save them. Cousteau joins Boyd in the studio to talk about Expedition: Blue Planet!, her 100-day journey across five continents to explore the most critical water issues of today.

• Kim McKay
Kim McKay, author of True Green Home: 100 Inspirational Ideas for Creating a Green Environment at Home, joins Boyd to share some easy, effective tricks for saving money while making your house greener.
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• Denis Belliveau and Francis O'Donnell
Denis Belliveau and Francis O’Donnell were fascinated by Marco Polo. But they weren’t content to just study his travels. Instead they decided to follow Marco Polo’s entire 25,000-mile journey through Central Asia—dodging bullets and fighting bureaucrats along the way. Belliveau and O’Donnell join Boyd in the studio to talk about the resulting book and film called In the Footsteps of Marco Polo.
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• Jonathan Waterman
Jonathan Waterman ran the entire Colorado River, all 1,450 miles of it. Waterman joins Boyd in the studio to talk about what he found along the way while he was rafting and walking downstream.
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• Marfe Furguson Delano
Earth in the Hot Seat: Bulletins from a Warming World is a new National Geographic book written by Marfe Ferguson Delano. Delano joins Boyd in the studio to explain how she constructed the children’s book to clearly explain the dangers and challenges of global warning.
Online Quiz for Kids

• Jerry Camarillo Dunn
For his new book, My Favorite Place on Earth: Celebrated People Share Their Travel Discoveries, National Geographic Traveler writer Jerry Camarillo Dunn asked such diverse figures as Sandra Day O'Connor and the Dalai Lama, actors Robin Williams and Morgan Freeman, astronauts Buzz Aldrin and Sally Ride, explorer Jean-Michel Cousteau, real estate mogul Donald Trump, and entertainer Jerry Seinfeld one question: What is your favorite place on Earth? Dunn joins Boyd to reveal some of the surprising answers.
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• Notes
Boyd talks about Green Effect, the new initiative from SunChips and National Geographic to inspire individuals to spark a green movement in their communities and win $20,000 in the process.
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