Mark Tercek

Former President & CEO of The Nature Conservancy

Harvey Wasserman

Journalist, Author, Democracy Activist & Advocate for Renewable Energy

Michael Shellenberger

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

Jonathan Trent

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

Chad Pregracke

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

Tony Juniper

Writer, Sustainability Advisor, & Environmentalist

Christiana Figueres

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

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

David Crane

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

Gus Speth

Environmental Lawyer and Advocate; Vermont Law Professor

Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist

John Passacantando

Former Executive Director of Greenpeace USA

Bindi Irwin

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

Louie Psihoyos

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

David Trimble

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

Laurie David

Producer, Activist Author,The Family Dinner: Great Ways To Connect With Your Kids One Meal At A Time

Erin Schrode

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

Calum Worthy

Canadian Actor & Environmental Activist

Kent Connaughton

Regional Forester of the USFS Pacific Northwest Region

Brian Palik

Team Leader / Research Ecologist for the Center for Research on Ecosystem Change at the USDA Forest Service Northern Research Station

Stephen J. Pyne

Senior Sustainability Scientist, Global Institute of Sustainability, and Regents' Professor, School of Life Sciences, at Arizona State University

Dennis Dimick

Former Executive Environment Editor at National Geographic Magazine

Jae Rhim Lee

Artist and TED Fellow Jae Rhim Lee Re-Imagines the Relationships Between the Body and the World

Hayden Panettiere

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

Andrew Hoffman

Holcim (US) Professor of Sustainable Enterprise at the University of Michigan

Sy Montgomery

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

Secrets of the Octopus

Julian Baggini

Julian Baggini is the author of several books about philosophy written for a general audience. He is the author of The Pig that Wants to be Eaten and 99 other thought experiments and is co-founder and editor-in-chief of The Philosophers' Magazine.

Cassandra Moseley

Director of the Ecosystem Workforce Program in the Institute for a Sustainable Environment at the University of Oregon

Naomi Oreskes

Geologist & Earth Science Historian