Steve LeVine

Writer at The Electric; Expert on Batteries, Electric Vehicles, and their Impact on Society, Cities & Geopolitics

Achenyo Idachaba

Head of MitiMeth, A Nigeria-Based Environmentally Aware Production Company

Michael Shellenberger

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

Sarah Kauss

Founder of S'well, Advisor, Investor & Advocate

Alex Epstein

Founder, Center for Industrial Progress Author, Fossil Fuels Improve the Planet

Ric O'Barry

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

Jennifer Pharr Davis

Long-Distance Hiker & Author; Overall Record Holder on the Appalachian Trail & The First Woman to Set That Mark

Outdoor School: Hiking and Camping: The Definitive Interactive Nature Guide

Annie Griffiths

Award-Winning Photographer for National Geographic

Ellen MacArthur

Former Long-Distance Yachtswoman & Founder of the Ellen MacArthur Foundation

Naomi Oreskes

Geologist & Earth Science Historian

Pat Wood

CEO of the Hunt Energy Network; Former Chairman of the Federal Energy Regulatory Commission

Miki Agrawal

Author of "Do Cool Sh*t" & "Disrupt-Her: A Manifesto for the Modern Woman"

Louie Psihoyos

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

Barbara Boxer

Former Democratic Senator of California

Celine Cousteau

Environmental Activist, Storyteller & Author

Céline Cousteau's Speaker Reel

Joel Sartore

National Geographic Photographer & Author

Marc Freedman

Founder & CEO of Encore.org; World Economic Forum Social Entrepreneur of the Year

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

Roshi Joan Halifax

American Zen Buddhist Teacher