David Suzuki

Environmentalist & Scientist; Co-Founder of the David Suzuki Foundation

Denise Austin

Fitness Expert, Author & Video Hall of Famer

Brad Meltzer

Host of History Channel’s "Lost History" & "Brad Meltzer’s Decoded;" New York Times Best-Selling Author

Graham Hill

Founder of Life Edited & TreeHugger.com

Ted Turner

Media Mogul & Philanthropist

Norman Reedus

Actor; Best Known as Daryl Dixon on "The Walking Dead"

Terrence Howard

Actor, Musician & Activist; Known for Fox's "Empire"

Moby

Musician, DJ, Photographer

Shaun Tomson

Former World Champion Surfer, Environmentalist & Motivational Speaker

Patton Oswalt

Comedian, Actor and Writer

Danica McKellar

Mathematician, Writer, Actress, Author & Producer

Donald Glover

Award-Winning Actor, Comedian, Writer, Director & Musician; Performs as Childish Gambino

Zoë Saldaña

Actress Known for "Avatar" & "Guardians of the Galaxy"

Zoe Saldaña Reacts To Her Iconic Roles

Sara Moulton

Cookbook Author, TV Personality & Executive Chef of "Gourmet Magazine"

Natalie Dormer

Actress; Known for Her Role as Margaery Tyrell on "Game of Thrones"

Jon Landau

Academy Award-Winning Producer of Titanic & Avatar

Forrest Sawyer

Award-Winning Broadcast Journalist

Bob Arnot

Medical and Foreign Correspondent and Best-Selling

Pauley Perrette

Actress & Musician; Known for Abby Sciuto on CBS's "NCIS."

Ali Larter

Actress, Author & Model; Known for "Heroes" & "Final Destination"