Louie Psihoyos

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

Chad Pregracke

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

Mark Tercek

Former President & CEO of The Nature Conservancy

John Passacantando

Former Executive Director of Greenpeace USA

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

Jonathan Trent

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

Nick Jans

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

Harvey Wasserman

Journalist, Author, Democracy Activist & Advocate for Renewable Energy

Jake Norton

World-Renowned Climber, Photographer & Humanitarian

Tony Juniper

Writer, Sustainability Advisor, & Environmentalist

Sy Montgomery

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

Secrets of the Octopus

Bindi Irwin

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

Naomi Oreskes

Geologist & Earth Science Historian

Carl Pope

Senior Advisor to UN Envoy for Cities and Climate; Former CEO and Chairman of the Sierra Club

Barton Seaver

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

Annie Griffiths

Award-Winning Photographer for National Geographic

David Crane

Strategic Advisor Executive at Pegasus Capital Advisors; Former President & CEO of NRG Energy, Inc.; Climate Advocate

Dennis Dimick

Former Executive Environment Editor at National Geographic Magazine

Gus Speth

Environmental Lawyer and Advocate; Vermont Law Professor

M. Sanjayan

Executive Vice President & Senior Scientist at Conservation International

Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist

Ron Pernick

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

Christine Ervin

Former US Assistant Secretary of Energy; National Leader on Green Buildings & Clean Energy

Ric O'Barry

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

Calum Worthy

Canadian Actor & Environmental Activist

Louis-Philippe Loncke

European Adventurer 2016, Explorer, Motivational Speaker, Entrepreneur, Management Consultant

Paul Deegan

Motivational and Leadership Expert, Everest Mountaineer and Award-Winning Author

Michael Nichols

Journalist, Photographer & Founder of the LOOK3 Festival of the Photograph

David Trimble

Director of Natural Resources and Environment at the Government Accountability Office.