Karen Tse

Human Rights Defender & Social Entrepreneur; Founder of International Bridges of Justice

Ed Begley Jr.

Environmental Activist & Emmy Award-Nominated Actor

Mark Lynas

Environmental Writer; Author of "Our Final Warning: Six Degrees of Climate Emergency"

Tory Belleci

Television Host & Model Maker; Best Known for "MythBusters"

Jeffrey Hollender

Co-Founder of Seventh Generation and Author of "The Responsibility Revolution: How the Next Generation of Businesses Will Win"

Jason Clay

Senior Vice President of Food & Markets at WWF

Bunker Roy

Founder of Barefoot College

Neal Petersen

History-Making Extreme Adventurer, Award-Winning Author & Global Investor

Katrina Markoff

Founder & CEO, Vosges Haut-Chocolat

Josh Tickell

America's #1 Expert on the Millennials generation. Creator, Director and Star of the movie "FUEL"

Ray Zahab

Ultra-marathon Runner and Adventurer; Host, "The Project"; Author of "Running for My Life"

Lamman Rucker

Actor, Education Activist, Green Living Advocate & Entrepreneur

Louie Schwartzberg

Award-Winning Cinematographer, Director, Photographer and Filmmaker

John Izzo, PhD

Leadership Expert & Bestselling Author

Calvin Trillin

Author, Columnist, Humorist & Political Satirist

Jody Williams

Humanitarian and Nobel Peace Prize Winner and Chairman of the International Campaign to Ban Landmines

Tom Chappell

Co-Founder and CEO of Tom's of Maine & Ramblers Way

Dr. Mike Magee

President of Positive Medicine, Inc., Health Journalist & Author

Ahmed Hassan

Celebrity Landscaper & TV Host of DIY's Yard Crashers, Blog Cabin, Turf War

Aubrey de Grey

Biomedical Gerontologist; Chief Science Officer of SENS Research Foundation; Researcher on Preventing Aging

Sebastian Copeland

Adventurer, Environmental Activist, Award-Winning Photographer, Author, Lecturer & Founder of the Sedna Foundation

Rory Sutherland

Vice Chairman of Ogilvy Group UK & Expert in Digital Technology in Advertising

Doug Fine

Globe-Trotting Journalist, Award-Winning Climate Correspondent, Goat-Herder & Author

Dennis Avery

Former Director, Center for Global Food Issues at the Hudson Institute

Joel Makower

Expert in Sustainable Business, Clean Technology, and the Green Marketplace; Founder of GreenBiz.com

Craig Kielburger

Co-Founder of the WE Organization, Social Entrepreneur, Humanitarian & New York Times Best-Selling Author

Raj Patel

Award-Winning Writer, Food Politics Activist, Filmmaker & Academic

Peter Gleick

Co-founder & President of the Pacific Institute for Studies in Development, Environment & Security

The Three Ages of Water

Amber Jenkins

Applied Science Engineer, NASA’s Jet Propulsion Laboratory; Editor, NASA Climate Change Website

Winona LaDuke

Executive Director of Honor the Earth