Chad Pregracke

Founder of Living Lands & Waters, CNN's Hero of the Year for 2013, Environmental Speaker & Bestselling Author

Michael Shellenberger

Founder & President of Environmental Progress; Expert on Energy, Climate, Security, Human Development and Politics

Christiana Figueres

Expert on Global Climate Change; Former Executive Secretary of the UN Framework Convention on Climate Change

John Passacantando

Former Executive Director of Greenpeace USA

David Mizejewski

National Wildlife Federation Naturalist & Media Personality

Louie Psihoyos

Photographer & Documentary Film Director Known for the Academy Award-Winning Documentary "The Cove"

Mark Tercek

Former President & CEO of The Nature Conservancy

Bindi Irwin

Wildlife Conservationist & Daughter of Steve Irwin; Season 21 Contestant on "Dancing With the Stars"

Marla Spivak

Entomologist; Focused on Practical Applications to Protect Honey Bee Populations

Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist

Tony Juniper

Writer, Sustainability Advisor, & Environmentalist

Erin Schrode

Expert Advocate for Health, Sustainability & Environmental Education; Named "America's Green Girl" by OK Magazine

Ric O'Barry

Wildlife Activist, Author & Founder of the Dolphin Project; Star of the Academy Award-Winning Documentary "The Cove"

Katie Cleary

Actress and Model; Founder of Peace 4 Animals and World Animal News

Dennis Dimick

Former Executive Environment Editor at National Geographic Magazine

Nalini Nadkarni

Ecologist, Director of STEM Ambassador Program & Leading Expert in Canopy Research

Barton Seaver

Celebrity Chef, Author & Sustainable Food Advocate; National Geographic Fellow; Ocean Conservationist

Kate Orff

Sustainable Landscape Architect; Founder of SCAPE

Ron Pernick

Co-Founder & Managing Director of Clean Edge, Inc.

Dr. Tierney Thys

Marine Biologist, Educator & Filmmaker

Nick Jans

Nature Writer & Photographer; Bestselling Author of "A Wolf Called Romeo"

Sy Montgomery

Naturalist, Adventurer & Author of "The Good Good Pig" & "The Soul of an Octopus"

Secrets of the Octopus

Elaine Hendrix

Actress & Animal Activist; Known for her Role in the Remake of "The Parent Trap"

Simon Lovell

English Comedy Magician, Card Shark Actor and Con Man

Annie Griffiths

Award-Winning Photographer for National Geographic

Jonathan Trent

Former Director of Offshore Membrane Enclosures for Growing Algae; Founder of UpCycle Systems

M. Sanjayan

Executive Vice President & Senior Scientist at Conservation International

Pink

Singer-Songwriter, Actress, Philanthropist & Environmental Activist

Hayden Panettiere

Actress Known for "Nashville" & "Heroes" & Animal Rights Activist

Vijay Gurbaxani

Director of the Center for Digital Transformation & Taco Bell Professor of Business & Computer Science